10 Things to Consider When Buying Citrus Aurantium Extract Powder

Citrus aurantium L. (Rutaceae), commonly known as bitter orange, possesses multiple therapeutic potentials. These biological credentials include anticancer, antianxiety, antiobesity, antibacterial, antioxidant, pesticidal, and antidiabetic activities. The essential oil of C. aurantium was reported to display marked pharmacological effects and great variation in chemical composition depending on growing locations but mostly contained limonene, linalool, and β-myrcene. Phytochemically, C. aurantium is rich in p-synephrine, an alkaloid, and many health-giving secondary metabolites such as flavonoids. Animal studies have demonstrated a low affinity of p-synephrine for adrenergic receptors and an even lower affinity in human models. The present review focuses on the different biological activities of the C. aurantium in animal and human models in the form of extract and its pure secondary metabolites. Finally, it is concluded that both the extract and isolated compounds have no unwanted effects in human at therapeutic doses and, therefore, can confidently be used in various dietary formulations.

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In the last years, phytopharmaceuticals have shown an outstanding role in new drug discovery [ 18 &#; 20 ]. Both in the crude form as well as pure chemical entities, a large population around the globe are getting therapeutic benefits from them [ 21 &#; 23 ]. In this review article, we have aimed to overview the bioactivity studies performed on C. aurantium revealing its therapeutic potential in the light of isolated molecules and/or essential oils.

Citrus aurantium L. (Rutaceae), commonly known as bitter orange, is usually utilized as a flavoring and acidifying agent for food [ 1 ]. Besides the essential oil and its components [ 2 , 3 ], the fruits of C. aurantium are sources of flavonoid-type compounds with diverse biological effects [ 4 &#; 6 ]. Additionally, it was reported that flavonoid glycosides were isolated from the plant [ 7 ] and the biogenic amine and flavanone contents have been determined [ 8 , 9 ]. Due to the abundance of health-giving secondary metabolites, C. aurantium is also used for the treatment of several ailments such as anxiety [ 10 ], lung and prostate cancers [ 11 ], and gastrointestinal disorders and obesity [ 2 , 12 ]. Due to the prohibition of Ephedra sinica Stapf. in Farw.-containing weight loss products in the market, C. aurantium has found an important place as a preferable agent to replace ephedra, as it contains p-synephrine, a phenylethanolamine type alkaloid, which is chemically similar to adrenergic agents, as appetite suppressants [ 12 &#; 14 ]. Recently, several scientific studies investigating the potential effects of various parts (including flowers, fruits, and essential oils) of C. aurantium have been conducted [ 15 &#; 17 ].

Zarrad and coworkers [ 32 ] explored the chemical composition of Tunisian C. aurantium fruits using gas chromatography (GC) and gas chromatography-mass spectroscopy (GC-MS). 25 compounds were identified in 97.696% exploration, but the most prominent one was limonene with 85.52%, followed by linalool and β-myrcene with 3.365% and 1.628%, respectively. The remaining compounds were in traces. Earlier, Villafane et al. [ 33 ] reported the presence of D-limonene and nootkatone in the essential oil of the plant. Similarly, Sanei-Dehkordi et al. [ 34 ] identified 21 compounds in peel essential oil of the plant. Of the total explored 98.62% composition, the quantity of limonene was 94.81% while the LC 50 was 31.20 ppm against Anopheles stephensi. However, the concentration of limonene was only 0.5&#;2.5% in C. aurantium from Algeria and linalool and α-terpineol were 18.6% and 15.1%, respectively [ 35 ]. Thus, overall considerable variation was observed in the concentration of these major components in C. aurantium grown in different parts of the world [ 36 &#; 41 ]. Carvalho-Freitas and Costa observed strong anxiolytic and sedative-like effects of the essential oil derived from C. aurantium [ 42 ].

Another class of compounds contained in C. aurantium are phenylethylamine alkaloids with p-synephrine being the most abundant. This compound has a hydroxyl group in the para position on the benzene ring and has some structural similarity to ephedrine. The peel of unripe fruits is the part of the plant which has the highest level of p-synephrine [ 31 ].

The second class of secondary metabolites found in C. aurantium are the limonoids ( Scheme 2 ). The latter were considered as oxygenated triterpenoids as they contain relatively high numbers of oxygen atoms (7&#;11) in their structures. All components have a furan ring attached to the D-ring at C-17. Limonoids occur both in glucosidic and aglyconic form. Limonoid aglycones are water-insoluble and responsible for a bitter taste of the Citrus fruits, while limonoid glucosides are water-soluble and tasteless [ 28 ]. Among limonoids, the most important one is limonin, known as Citrus constituent since . Limonoid glucosides are more abundant in juices and pulps, such as limonin glucoside, nomilin glucoside, obacunone glucoside, nomilinic acid glucoside, and deacetylnomilinic acid glucoside, because they are water-soluble, while limonoid aglycones such as limonin, nomilin, obacunone, ichangin, and deacetyl nomilin are water-insoluble and are present mainly in seeds and peels [ 29 , 30 ].

In C. aurantium, the flavones may be present also in the methoxylated form, in which all or almost all hydroxyls are capped by methylation, as nobiletin and tangeretin [ 27 ]. Furthermore, the C. aurantium may contain low amounts of flavonols, as kaempferol and quercetin, mainly in glycosidic form.

The flavones in aglycon or/and glycosidic form are the second major group of flavonoids in C. aurantium. The most commonly detected free flavones are apigenin, luteolin, and diosmetin. O-Glycosides and C-glycosides are the two main forms of flavone glycosides, and the most common linked sugar moieties include glucose, rutinose, and neohesperidose [ 26 ].

Flavanones are the main flavonoids contained in C. aurantium [ 25 ]. The most abundant detected free flavanones are hesperetin (4&#;-methoxy-3&#;,5,7-trihydroxyflavanone) and naringenin (4&#;,5,7-trihydroxyflavanone) [ 26 ]. Hesperetin and naringenin present a common skeleton: two hydroxyl group in positions C-5 and C-7, respectively, and they can be found as aglycone and/or as glycosides [ 25 ]. The most widely distributed glycosides of hesperetin are hesperidin and neohesperidin, which are conjugates with rutinose and neohesperidose, respectively, while, for naringenin, the most abundant glycosyl derivatives are naringin (naringenin-7-neohesperidoside) and narirutin (naringenin-7-rutinoside) [ 25 ].

Flavonoids are mainly present in Citrus fruits as glycosyl derivatives. Aglycones are mainly present in specific parts of the fruit as peel and seeds, owing to their lipophilic nature and consequently their low solubility in water [ 21 &#; 23 ]. For glycoside forms, O-glycosides, C-glycosides, rutinosides, glucosides, and neohesperidosides are common [ 21 &#; 23 ]. The presence of a relatively large number of glycosylated flavonoids in Citrus is a result of many different combinations possible between polyhydroxylated aglycones and a limited number of mono- and disaccharides [ 24 ].

The chemical composition of C. aurantium is responsible for health-promoting effects. The chemical composition includes vitamins, minerals, phenolic compounds, and terpenoids [ 21 &#; 23 ]. Among the diverse chemical components in C. aurantium, flavonoids belonging to phenolics have been recognized as important due to their physiological and pharmacological role and their health benefits [ 21 &#; 23 ].

3. Pharmacological Profile

3.1. Cytotoxic and Anticancer Effects

The anticancer activity of the plant has been reported in literature [26, 43]. Cytotoxic properties of the polysaccharides obtained from C. aurantium were examined. Cytotoxic activity on human breast cancer cells (MCF-7) and lung cancer cells (HCC827) and immune-enhancement effect were examined. The results indicated that C. aurantium var. amara polysaccharides displayed good immune-enhancement activity by stimulating the production of tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) in RAW264.7 cells and by promoting the mRNA expression levels of inducible nitric oxide synthase (iNOS), TNF-α, interleukin-1β (IL-1β), and IL-6. Moreover, phosphorylated extracellular signal-regulated kinase (ERK), phosphorylated c-Jun N-terminal kinase (JNK), phosphorylated p38, and phosphorylated p65 were significantly enhanced in C. aurantium var amara polysaccharides-treated RAW264.7 cells [24, 44]. Isolimonic acid and ichanexic acid from ethyl acetate extract of C. aurantium were isolated by using chromatographic methods. The compounds for their inhibitory action on human colon cancer cells (HT-29) proliferation, apoptosis, and on noncancerous (COS-1 fibroblast) cells were investigated. The compounds displayed an increment in the cell counts in G2/M stage, demonstrating a potential effect in the cell-cycle arrest [25].

Protective activity of the extract obtained from the peels of C. aurantium against apoptosis in cholestatic liver fibrosis-induced mice was investigated. As part of the experiment, cholestatic liver injury was induced by bile duct ligation and the mice were treated with C. aurantium peel extract. According to the histopathological analysis, the administration of C. aurantium peel extract significantly decreased liver fibrosis. Biochemical analysis revealed that the extract reduced the concentrations of alanine transaminase (ALT), aspartate transaminase (AST), gamma-glutamyl transferase, total bilirubin, nitric oxide, and thiobarbituric acid reactive substances (TBARS), suggesting C. aurantium can efficiently regulate bile duct ligation-induced liver injury by displaying antioxidant, anti-inflammatory, and antiapoptotic effects [27].

C. aurantium was shown to possess antimetastasis activities in in vitro assays. A study by Park et al. evaluated the antimetastatic effect of flavonoids, isolated from Korean C. aurantium in mice models. Flavonoids were shown to prevent cancer cell infiltration and localization to the lungs. Moreover, through the regulation of caspase-3 and phospho-p53, the flavonoids induced cancer cell apoptosis. In vitro tests demonstrated that flavonoids inhibited A549 cells metastasis and induced apoptosis and downregulation of the Ddx3x and ANP43B proteins, supporting the use of C. aurantium flavonoids in human lung cancer treatment. According to the bioactivity assays conducted on the major compounds of C. aurantium var. amara, namely, 5-hydroxy-6,7,30,40-tetramethoxyflavone (HTF) and limonexic acid (LA), both compounds showed remarkable antioxidant effects and notable inhibitory action on the B16 and SMCC- cell lines, at a concentration between 6.25 and 50&#;μg/mL and between 12.5 and 200&#;μg/mL, respectively [28]. Figure 1 illustrates the cytotoxic effects and mechanisms of C. aurantium extracts.

Figure 1.

Cytotoxic effects and mechanisms of C. aurantium extracts.

Miyazawa et al. [45] isolated three polymethoxy flavonoid-type compounds, namely, tetra-O-methylscutellarein, sinensetin, and nobiletin from C. aurantium. These compounds caused marked downstream regulation of a variety of gene expressions and thus showed strong antimutagenic activity. Wang and coworkers [46] summarized the anticancer effects of polymethoxyflavones with detailed molecular mechanisms. The various amines and flavonoids have been quantitatively analyzed in C. aurantium using liquid chromatography [47, 48]. Hesperidin has been isolated from C. aurantium [49]. It displayed a significant apoptotic effect against liver cell lines, HepG2 cells, by mediating through the upstream regulation of mitogen-activated protein kinase ERK1/2 [50].

3.2. Anxiolytic and Sedative effects

The anxiolytic and sedative effects of C. aurantium by in vivo light-dark box and the marble-burying assays were evaluated. C. aurantium essential oil enhanced the period the mice spent in the light chamber, as well as the number of transitions between the two compartments in the light-dark box test [29]. Moreover, single and repeated treatments with the essential oil were reported to suppress marble-burying behavior [10]. The anxiolytic activity of the blossom of C. aurantium was also evaluated clinically on 60 patients undergoing minor surgical operation with no organic pathology. Two hours before the anesthesia induction, two groups consisting of 30 patients were administered at 1&#;mL/kg of either C. aurantium distillate or saline solution. Anxiety was assessed by using the Spielberger state-trait anxiety inventory, the Amsterdamd preoperative anxiety, and information scale. The outcome of this study revealed that C. aurantium could be active by reducing preoperative anxiety before minor operation [30].

In traditional Chinese medicine (TCM), the combination of the aqueous extracts of the fruits of Gardenia jasminoides Ellis, C. aurantium, and the bark of Magnolia officinalis Rehd. et Wils. is called Zhi-Zi-Hou-Po (ZZHPD) and has been used to treat depression-like symptoms. Xing et al. [51] explored in vivo antidepressant activity of ZZHPD in rats, by using coat state test, sucrose preference test, forced swimming test, and open-field test. The effects of ZZHPD on hypothalamic-pituitary-adrenal (HPA) axis were determined by measuring the hormone levels. The results showed that ZZHPD improved depressive behaviors and normalized the adrenocorticotropic hormone (ACTH) and corticosterone levels, by restoring the function of HPA axis, and increasing brain-derived neurotrophic factor expression in hippocampus and promoting hippocampal neurogenesis [51]. ACTH/corticotropinis a peptidic hormone secreted from the anterior pituitary, which regulates glucocorticoid cortisol production from the adrenals [52]. Stress increases ACTH release, which induces the stress hormone cortisol, together they cause numerous diseases [53].

Letie et al. [54] conducted another study in vivo, where rat models were exposed to the essential oil of C. aurantium at 1.0%, 2.5%, and 5.0% concentrations by inhalation, in acrylic boxes before employing elevated plus maze and open-field assays. C. aurantium essential oil increased the time of the animals in the open arms of the elevated plus maze test and the time of active social interaction in the open field [54].

Wolfenbuttel et al. [55] investigated the influence of C. aurantium essential oil on melatonin and corticosterone in mice after inhalation for 30&#;min. Melatonin provides protective effects on neuronal cells and acts as an antidepressant by restoration of corticosterone levels. After treatment, the hormone levels did not present variation, whereas behavioral tests showed that the inhalation of 10% essential oil causes an anxiolytic-like and sedative effect. From these data, Citrus essential oil represents a valuable tool for the treatment of the anxiety disturbs, apparently without interference with melatonin and corticosterone physiological levels [55].

3.3. Antidiabetic Effects

Several reports have been cited in literature regarding the antidiabetic effects of C. aurantium [56&#;58]. An in vivo study was performed to evaluate the antidiabetic effect and to reveal the toxicity profile of the aqueous extract of the fruits of C. aurantium and the leaves of Rauwolfia vomitoria. In this study, NMRI lean mice (6-week-old) and C57BL/6J lean mice (6- or 11-week-old) were used. A single dose, which corresponds to seventy-fold of a human daily dose, was detected to be nontoxic to the animals. A significant weight loss was determined when the dosage, which corresponds to tenfold of a human daily dose, was administered to C57BL/KsBom-db (db/db) genetic diabetic mice for 6 weeks. These mice were maintained on the carbohydrate-deficient diet during the treatment period. The food intake was not significantly different from the control group animals; however, the serum triglyceride levels of the treated animals were significantly higher suggesting the lipid mobilization from internal stores. The fatty acid levels of the eyes of the treated mice remarkably reduced along with stearoyl-CoA desaturase activity [59]. A possible effect of the extract obtained from C. aurantium and p-synephrine on liver metabolism was evaluated. In order to measure catabolic and anabolic pathways, an isolated perfused rat liver was used. Both the extract and the compound were found to enhance glycolysis, glycogenolysis, oxygen uptake, and perfusion pressure. p-Synephrine increased the glucose output at 200&#;μM concentration. C. aurantium extract enhanced gluconeogenesis at low concentrations, however, inhibited at high concentrations. The effects of C. aurantium extract on liver metabolism was found to be similar to those of adrenergic agents, and p-synephrine could be responsible from the activity [14].

3.4. Antiobesity Effects

Besides its scientifically proven antimicrobial, antioxidant, cytotoxic, anxiolytic, and antidiabetic effects, C. aurantium extract has been commonly utilized for the weight loss and as sports performance enhancer, in dietary supplements [60&#;62]. Therefore, the use of C. aurantium extract and its constituent p-synephrine (C9H13NO2), for the treatment of obesity in 360 subjects, was reviewed. More than 50% of the subjects involved in these clinical studies were overweight, and approximately two-thirds of them consumed caffeine (132&#;528&#;mg/day) and p-synephrine (10&#;53&#;mg/day). Approximately 44% of the subjects used a C. aurantium/p-synephrine product, while the remaining consumed a combination product containing multiple ingredients with p-synephrine. The results showed that C. aurantium extract alone or in combination with other ingredients did not cause significant adverse effects including an increase in heart rate or blood pressure or change in electrocardiographic data, serum chemistry, blood cell counts, or urinalysis. p-Synephrine, alone or in combination products, was demonstrated to enhance metabolic rate and energy expenditure and to promote weight loss when given for six to 12 weeks [63].

The study by Verpeut et al. [64] investigated the effect of the combination of C. aurantium (standardized to 6% p-synephrine) and Rhodiola rosea L. (golden root) (standardized to 3% rosavins and 1% salidroside) on diet-induced obesity in Sprague-Dawley rats. Acute administration of C. aurantium (1&#;10&#;mg/kg) or R. rosea (2&#;20&#;mg/kg) alone did not decrease food intake in normal weight animals; however, the combination of C. aurantium (5.6&#;mg/kg) and R. rosea (20&#;mg/kg) provided a 10.5% feeding suppression. On the other hand, 10 days of treatment with C. aurantium (5.6&#;mg/kg) or R. rosea (20&#;mg/kg) alone, or in combination, to the animals fed on a high-fat diet (60% fat) during the 13-week period led to a 30% decline in visceral fat weight, compared with other treatments. Coadministration of C. aurantium and R. rosea also resulted in an elevation in hypothalamic norepinephrine and frontal cortex dopamine, indicating the beneficial role of C. aurantium and R. rosea in the treatment of obesity [64]. Figure 2 illustrates the various pharmacological effects of C. aurantium extracts.

Figure 2.

Pharmacological effects of C. aurantium extracts.

3.5. Effects on the Cardiovascular System

The cardiovascular toxicity of C. aurantium extracts with different concentrations of protoalkaloid p-synephrine (4 and 6%) was reported by Calapai et al. in in rats. Authors showed an antiobesity effect by the administration of C. aurantium but also possible cardiovascular toxicity. The cardiovascular effects have not been confirmed by studies using much higher doses of p-synephrine [65].

Another study was carried out to evaluate the cardiovascular effects of different doses of C. aurantium and pure p-synephrine in rats. C. aurantium extract and pure p-synephrine enhanced the heart rate and blood pressure. Higher activities were obtained with C. aurantium extract than p-synephrine, suggesting that other compounds in the extract can alter physiological parameters [13]. The effect of p-synephrine on heart rate and blood pressure in female Sprague-Dawley rats was assessed. During 28 days, two types of extracts, one of which contained 6% and other 95% p-synephrine, were administered daily by gavage at 10 or 50&#;mg/kg, doses for a 60&#;kg human equal to 600 and &#;mg/kg. The outcome of the study showed that both p-synephrine and C. aurantium extract resulted in clinically insignificant increases in heart rate and blood pressure at doses many times greater than used in humans. p-Synephrine and bitter orange extract exhibited little or no effect on the cardiovascular effects of caffeine [13].

Safety of p-synephrine was investigated by Ratamess et al. [66] on humans, animals, and in vitro. Authors reported over 30 human studies indicating that the cardiovascular effects of p-synephrine and bitter orange extracts are clinically insignificant. p-Synephrine showed a greater ability to bind adrenergic receptors in rodents than in humans, and the data in literature on its effects on animals cannot be indicative for men at commonly used doses.

This review concluded that C. aurantium extract and p-synephrine are safe for use in dietary supplements and foods at commonly used doses. Also, other authors reported similar conclusions [67, 68]. While p-synephrine alone seems to have low toxicity, when it is formulated in combination with other ingredients such as caffeine (Paullinia cupana, Cola nitida, Cola acuminata, and Camellia sinensis), salicin (Salix sp.), and ephedrine (ma huang, Ephedra sinica, and Ephedra sp.) in weight loss products, the mixture could induce some cardiovascular effects. However, the study did not demonstrate that p-synephrine contributed to cardiovascular effects.

Schmitt et al. [69] reported clear signs of toxicity of this mixture in mice of both sexes as reduction in locomotor activity, ptosis, seizures, salivation, agitation, piloerection, and deaths after acute oral administration of 300, 350, and 400&#;mg/kg total of p-synephrine, ephedrine, salicin, plus caffeine in a 10&#;:&#;4&#;:&#;6&#;:&#;80 w/w ratio.

The volatile oil obtained from the flowers of C. aurantium var. amara, namely, neroli oil, is used to reduce heart rate and palpitations, to encourage sleep, and to soothe the digestive tract. Kang et al. [15] investigated the activity mechanism of neroli in mouse aorta. Neroli was found to exert vasodilator activity in mice precontracted with prostaglandin (PG)-F2α. Nevertheless, the relaxation was reduced in the endothelium-denuded ring or preincubation with the nitric oxide synthase inhibitor by neroli treatment. Moreover, the relaxation induced by neroli was partially reversed by soluble guanylyl cyclase inhibitor. Neroli also inhibited extracellular Ca2+-dependent and depolarization-induced contraction in a dose-dependent manner. Nonselective cation channel blocker, Ni2+, decreased neroli-induced relaxation. On the other hand, a K+ channel blocker, tetraethylammonium chloride, did not alter the relaxation. In order to prevent Ca2+ influx through the smooth muscle voltage-gated Ca2+ channels, verapamil was added. In this case, the ryanodine (a class of intracellular calcium channels) receptor inhibitor reduced neroli-induced relaxation. All these data indicated that neroli-induced relaxation might be partly mediated by the nitric oxide-soluble guanylyl cyclase, and ryanodine receptor signaling pathway [15].

3.6. Effect on Microorganisms

Antimicrobial activity of C. aurantium was investigated by using several in vitro assays [70&#;72]. For instance, Karabıyıklı et al. [1] explored the antimicrobial action of C. aurantium juice against Salmonella enterica Typhimurium and Listeria monocytogenes. For this purpose, both neutralized and unneutralized juice samples with various concentrations were tested for the inoculation of the microorganisms at 4°C and 37°C temperatures, during a period of seven days. The results showed that Salmonella enterica Typhimurium and Listeria monocytogenes not only survived but also grown for two days in neutralized juice at 37°C. On the other hand, on day 7, none of them survived. The results also revealed that L. monocytogenes was less resistant than S. enterica Typhimurium. The low pH of C. aurantium juice was suggested to be responsible for its antimicrobial potential along with the duration of the incubation period as well as the temperature [1]. In another research, the antimicrobial potential of C. aurantium was investigated, and high antimicrobial activity was recorded against Bacillus subtilis and Staphylococcus aureus (among 12 microorganisms tested), with the minimum inhibition concentration (MIC) values of 2.7&#;mg/mL and 4.8&#;mg/mL. Moderate effects were detected against Saccharomyces cerevisiae and Mucor ramannianus with the values of 9.2&#;mg/mL and 5&#;mg/mL, respectively. In the same study, radical scavenging and antibacterial effects of the essential oil obtained from the leaves of C. aurantium were evaluated. Weak antioxidant effect was detected against 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2&#;-azinobis-3-ethylbenzothiazoline-6-sulphonate (ABTS) radicals [73].

3.7. Pesticidal Effects

Previous in vitro investigations on the essential oil of C. aurantium peels and its isolated component limonene have demonstrated their pest fumigant activity against Bemisia tabaci (silverleaf whitefly). In 24&#;h exposure, insect mortality between 41.00 and 47.67% was determined at 2.5 and 20.0&#;μL/L air concentrations. In the same study, the authors conducted another assay, investigating the anticholinesterase effect of the oil itself, as well as that of the pure compound. Both exerted anticholinesterase effect with the IC50 values of 2.94&#;mM and 3.54&#;mM, respectively [74&#;76]. Other studies investigated the larvicidal effect of the essential oils of C. aurantium against Anopheles labranchiae. After 24&#;h, the mortality counts were carried out, and LC50 and LC90 values were determined. The outcome of this study demonstrated that the essential oils exerted significant larvicidal potential. C. aurantium essential oil was found to be the most active by the LC50 and LC90 values of 22.64&#;mg/L and 83.77&#;mg/L, respectively [13, 77]. The essential oil extract from the fresh peeled ripe fruit of Citrus aurantium showed also good larvicidal effect against mosquito vector Anopheles stephensi (LC50 values, 31.20&#;ppm) The main constituent of the leaf oil was limonene (94.81).

3.8. Antioxidant Effects

DPPH, ABTS, and ferric-reducing antioxidant power assays were used for the determination of the antioxidant potential of the macerate of the albedo layers of C. aurantium fruits obtained by protopectinase-SE (produced by Geotrichum klebahnii and hydrolyzed selectively the intercellular protopectin of plant tissues). Moreover, the levels of total phenols, reducing sugars, vitamin C, total flavonones, naringin, and galacturonic acid and total acidity were detected. Antioxidant activity, vitamin C, and total flavonone levels were found to be the highest with the greatest degree of tissue maceration [78&#;81]. In vivo and in vitro antioxidant activities of polysaccharide fractions from C. aurantium were evaluated. The most active fraction was subjected to ion exchange and gel-filtration chromatography to obtain four purified polysaccharides. Upon the evaluation of their antioxidant effect, it was found that C. aurantium can be utilized as an antioxidant in the food and medical industries [82, 83].

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In a study by Lagha-Benamrouche et al. [84], the antioxidant potentials of the peels and leaves of seven orange varieties obtained from Algeria were investigated by linoleic acid and β-carotene oxidation assays. The presence of phenolic compounds was also investigated. C. aurantium cv. Bigarade was found to have the highest phenol level. The antioxidant activity assay was in accordance with the phytochemical findings. C. aurantium displayed the highest action on slowing down the rate of linoleic acid and β-carotene oxidation [84, 85]. An antioxidant study was performed on the C. aurantium fruits on different ripening stages. According to the outcome obtained from DPPH free radical-scavenging and β-carotene/linoleic acid systems, the antioxidant activity was found to be varied related to the amount of the phenolic components [86]. Another antioxidant activity study revealed that during dehydration, different air-drying temperature affected the antioxidant effect of the C. aurantium by-products, including peel and pulp remaining after juice extraction [79]. C. aurantium peel and juice were suggested as a new potential source of natural antioxidants; although, they were found to be less effective than butylated hydroxytoluene (BHT), butylated hydroxyanisole (BHA), and ascorbic acid, used as antioxidant standards [87, 88]. Anti-inflammatory activity of the flavonoid-type compounds of Korean C. aurantium, namely, nobiletin, naringin, and hesperidin was investigated. Inhibition of proinflammatory mediators by blocking nuclear factor-kappa B (NF-ƘB) and mitogen-activated protein kinase (MAPK) signaling in lipopolysaccharide- (LPS-) stimulated RAW 264.7 macrophages was assessed [89]. The flavonoids were found to have the capacity to suppress the mRNA and protein expression of COX-2 and iNOS, by clarifying their anti-inflammatory action [4]. A polymethoxy flavonoid-rich C. aurantium extract was shown to have a protective effect on alcohol-induced liver injury in an animal study via AMPK and Nrf2-related signal regulation [90].

3.9. Antiulcer Effects

In order to assess the effect of C. aurantium essential oil and its main compound limonene on gastric mucosa, Moraes et al. [2] conducted a study in vivo. The essential oil and its compound limonene were found to possess protective activity in the gastrointestinal system against lesions, which were induced by ethanol and nonsteroidal anti-inflammatory drugs in rats, at doses of 250&#;mg/kg and 245&#;mg/kg, respectively. The essential oil and limonene increased the production of gastric mucus. The findings revealed that C. aurantium essential oil and its main compound limonene can be used as a promising target for the development of a novel gastroprotective drug [2]. In another study, the gastroprotective effect of β-myrcene, a monoterpene-type compound of C. aurantium, was evaluated. Experimental models of ulcer, induced by ethanol, NSAID stress, Helicobacter pylori, ischemia-reperfusion injury (I/R), and cysteamine (a drug used to treat cystinosis) was used to assess the ameliorative activity. β-Myrcene was administered at dose of 7.5&#;mg/kg. The results showed a potential role for β-myrcene against peptic ulcer disease. β-Myrcene contributed to the maintenance of integrity of the gastric mucosa with a significant decrease of ulcerative lesions, attenuating lipid peroxidative damage and preventing depletion of GSH, GR, and GPx [91].

Polo et al. confirmed the healing properties of C. aurantium essential oil on gastric ulcers after treatment in middle-aged Wistar rats. They showed a significant reduction of the lesion area (76%) within the gastric mucosa that appears regenerated (59%) when compared to the negative control group [92].

On the other hand, Hamdan et al. assessed the effects of hesperidin and neohesperidin, important flavonoid-type components of C. aurantium. For this purpose, indomethacin-induced ulcer models of rats were used. Omeprazole was administered as a reference standard for the comparison. The parameters analyzed in the present study were ulcer index, gastric cyclooxygenase-2 (COX-2) gene expression, TNF-α, MDA, and GSH levels. Histopathalogical analysis was also performed. The findings of the study revealed that hesperidin and neohesperidin notably aggravated indomethacin-induced gastric damage as evidenced by increased ulcer index and histopathological alteration [93]. Recently, hesperidin showed strong inhibition against ovarian cancer cell viability and caused apoptosis mediated through endoplasmic reticulum stress signaling pathways [94]. Hafidh et al. [95] observed the potent anticancer effects of limonene in hepatocellular carcinoma and HepG2, and the cell line caused the modulation of cancer-inducing genes. These data confirmed the antioxidant and prooxidant behavior of flavonoids showing the potential benefits and adverse effects of these opposing events.

Citrus aurantium extract powder is made from dried young fruit of Citrus aurantium L. It is collected in May to June. The major compound has been isolated in modern research, namely, Hesperidin,neohesperidin, nobiletin, d-limonene, auranetin, aurantiamarin, nuringin, synephrine , limonin. Synephrine is the main active ingredient in lime fruit, which can effectively prevent excess energy (accumulation of heat), disperse wind and regulate qi, warm the stomach, promote appetite and speed up metabolism. Lime could theoretically accelerate fat metabolism without the adverse cardiovascular effects of ephedra patients. It is also a mildly fragrant expectorant, a nerve sedative and a laxative for constipation.

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- perishable goods or goods with a short shelf life;
- packaged goods that have been unpacked after delivery and are unsuitable for return for health or hygiene reasons.

Returned or exchanged quality goods must be undamaged ,have not lost their marketable appearance (not removed or damaged labels, not torn off protective films, etc.), and cannot be used. The product must be returned in its original packaging, in the same configuration as that received by the buyer, necessarily providing a document on the purchase of the product. If the product is not fully completed, is damaged, disorderly or not properly packaged, we have the right not to accept the product, not to change it and not to return the money paid by the buyer for the product.

Money for returned, undelivered or low-quality goods will be transferred to your bank account from which you paid for purchases no later than 5 business days after submitting the application, by .

Quality goods can not be returned if it is:
- goods that were produced according to the individual order of the buyer or are obviously adapted to him
- which, by their very nature, can no longer be returned to the buyer due to the loss (loss)of marketable properties,
- are perishable or expire;
- in other cases, when the contract of sale cannot be waived in accordance with the laws of the Republic of Lithuania.

Return of items after purchase by .shop www.deepforet.lt in accordance with the above . 22 July Government Decree No. 738 approved retail trade rules of the Republic of Lithuania (hereinafter &#; the rules).

Return of goods after purchase of defective product
Return of goods after purchase of defective product and in other cases, in accordance with the Civil Code of the Republic of Lithuania (article 6.363 (7)) and the government of the Republic of Lithuania resolution (-07-22) on the approval of retail trade rules and the retail trade rules themselves.
In the event that the reason for the return of the product is the purchase of a product of inadequate quality, we undertake to replace the product of inadequate quality with a product of suitable quality at our own expense or return the money paid for the product when the product is of inadequate quality due to the fault of the manufacturer, i.e.y. no violations, damage caused by improper use by the buyer, unchanged parts, overlapping serial number of the purchased and returned goods, etc.

Return rules
When returning quality goods, the buyer is responsible for:
- packing of goods;
- delivery of goods to the seller (except when the wrong item was received).
- We may refuse to accept the product back if changes have been made to the appearance of the product or packaging that were not necessary to inspect the product, including damaged labels, torn off protective films and violations of transparent packaging that would not interfere with the exercise of the right to inspect the product.

Any discrepancies or exceptions can be reconciled and resolved by mutual agreement between the buyer and the company.
Returning www.deepforest.lt the purchased item must be submitted in a free form request, indicating all the necessary data - Order Number, Name, Surname, returned item, details required for refund-account number or others.
The amount to be returned may change from certain circumstances - if a discount was applied at the time of purchase, if the packaging of a quality product is damaged, if the value of the returned quality product is changed for objective reasons and it can no longer be realized for the same value as it was at the moment of the first purchase.
Quality goods return shipping costs are borne by the customer. The cost of replacing a defective product is borne by the company.

Guarantee
According to Article 6.363, paragraph 1, Paragraph 10 of the Civil Code of the Republic of Lithuania, the seller is responsible for the defects of the item, which are revealed within two years after the transfer of the item, if the law or contract does not provide for a longer term. The rights of the purchaser set out in this article shall be subject to a limitation period of two years.

Dispute resolution services
You can submit a request / complaint about a product or service purchased in our online store to the State Consumer Rights Protection Service (Vilniaus STR. 25, Vilnius, el. p. , . 8 5 262 67 51, fax. (8 5) 279 , website www.vvtat.lt (as well as state services for the protection of consumer rights for territorial divisions in counties) &#; whether to fill out an application form on the ODA platform http://ec.europa.eu/odr/

Rules for the purchase and sale of goods

1. General provisions
1.1. These e-shop rules (hereinafter referred to as the rules) are for the buyer and the seller (hereinafter referred to as &#;
Seller) a legally binding document setting out the rights and obligations of the parties.
1.2. The seller reserves the right to amend, amend or supplement these terms at any time. About
Changes in the rules the buyer is informed on the website of the e-shop.

2. Conclusion of a sales contract
2.1. The purchase and sale agreement between the buyer and the seller is considered to be concluded when the buyer
in the e-shop forms and places an order for goods, having previously familiarized with the following
rules.

3. Seller's rights
3.1. In case of significant circumstances, the seller may temporarily or completely suspend the electronic
store activities without prior notice to the buyer.
3.2. If the buyer tries to undermine the work, stability and security of the e-shop; or
in violation of its obligations, the seller has the right without warning to limit or suspend him
access to the e-shop.

4. Seller's obligations
4.1. The seller undertakes to make it possible to use the services of the e-shop,
which operating conditions are determined by these rules.
4.2. The seller undertakes to deliver the goods purchased by the buyer in the delivery method chosen by the buyer,
based on the conditions established by these rules of sale and purchase.
4.3. When due to unforeseen circumstances, the seller can not deliver the ordered in the e-shop
the seller has the right to terminate the purchase and sale agreement after informing the buyer beforehand.
The seller can offer a similar product. If the buyer refuses, the seller undertakes to return
paid money within 3 business days.
4.4. The buyer makes use of the rules 5.2. by right provided in the clause, the seller undertakes to return
The money paid to the buyer within 5 (five) business days, from the date of receipt of the returned item.
4.5. The seller may not return the amount of money paid to the buyer until the goods have been returned
To the seller or until the buyer provides proof that the goods are sent to the seller, taking into account,
what happens first.

5. Buyer's rights
5.1. The buyer has the right to purchase goods in the e-shop in accordance with these rules.
5.2. The buyer has the right to refuse the purchase and sale of goods concluded in the e-shop
contract, notifying the seller in writing no later than within 14 (fourteen) calendar
days from the date of delivery of the product.
5.3. The buyer's right discussed in paragraph 5.2 may be exercised by the buyer only if the item was not
damaged or not fundamentally changed its appearance, as well as if it was not used.

6. Buyer's obligations
6.1. The buyer must pay for the purchased goods and accept them in accordance with the procedure provided for in these rules.
6.2. If the buyer, at the time of delivery of the goods, without good reasons refuses to accept the goods, the seller
on demand, the buyer must bear the cost of returning the goods.
6.3. During the delivery of goods to the buyer, the buyer must together with the seller or with the person who delivered
check the condition of the shipment and the item (s).
6.4. The buyer, using the e-shop, confirms that he agrees to the following purchase &#;
sales rules and must comply with them.

7. Commodity prices
7.1. Prices of goods in the e-shop are indicated in euros. Prices are included with VAT.
Upon confirmation of the order, the delivery fee, if any, contributes to the total amount of goods
apply.

8. Ordering and payment of goods
8.1. The buyer, visiting the e-shop, chooses the goods he likes, which
puts it in the shopping cart. After the shopping cart is formed, the buyer enters personal data,
necessary for the fulfillment of the order: your name, surname, address to which the goods will be delivered,
number and additional information that may be important for the delivery of the ordered goods. Buyer approves
he has been familiar with these rules and confirms the order.
8.3. Payment can be made using Siskied, Seb, Luminor, citadels, Siauliai bank electronic
banking services and Visa / MasterCard payment cards. Settlements possible in euro
currency. Payments are processed using MakeCommerce.lt payment platform.

9. Delivery of goods
9.1. The buyer, when ordering the goods, must indicate the exact address of delivery of the goods.
9.2. The buyer must accept the goods himself. If the buyer cannot accept the goods himself, but the goods
delivered to the address specified by the buyer, the buyer has no right to make claims on the delivered goods
to the wrong person.
9.3. The seller delivers the goods to the buyer in accordance with the terms specified in the descriptions of the goods.
9.4. The characteristics of all goods sold are indicated in the description attached to each item.
The seller is not responsible for the color, shape or other of the goods in the e-shop
the parameters may not correspond to the real size, shape and color of the goods due to the Monitor used by the buyer
features.
9.5. When the buyer refuses the purchase and sale agreement, the buyer is returned all the goods paid by him
amounts including delivery costs paid by the buyer.

10. Return of goods
10.1. Quality goods can be returned within 14 days from the date of receipt. Sold
defective goods are eliminated, defective goods are replaced, returned
in accordance with the provisions of the Civil Code of the Republic of Lithuania.
10.2. When returning the goods, the following conditions must be observed::
10.2.1. The returned item must be in its original neat packaging (this item does not apply to
in case of Return of defective goods);
10.2.2. The item must be undamaged by the buyer;
10.2.3. The product must be unused and not have lost its marketable appearance: intact
labels, uncut protective films, etc. (this item does not apply where
returned defective goods);
10.2.4. The returned item must be of the same configuration as the one received by the buyer (this item
not applicable in case of Return of defective goods);
10.2.5. The seller has the right to refuse to accept the goods returned by the buyer if there was non-compliance
terms of Return of goods;
10.2.6. Return of goods is carried out in the manner determined by the seller within 14 (fourteen) days from the goods
days of receipt (this item does not apply in case of defective goods - in this case executed
return of goods within the statutory warranty period);
10.3. Return and exchange of goods of appropriate quality is carried out in accordance with the Civil Code
Article 6. (1);
10.4. The money paid for the goods accepted by the buyer, but subsequently refused, is returned to the buyer's account
no later than 5 (five) days from the date of Return of the product to the seller, unless the seller and
The buyer agrees otherwise.

11. Final provisions
11.1. These rules are established in accordance with the legal acts of the Republic of Lithuania.
11.2. These rules and the relations between the parties are subject to and interpreted in relation to these rules
according to the laws of the Republic of Lithuania.
11.3. All disagreements arising from the implementation of these rules are resolved by negotiation. Failure to agree,
disputes shall be resolved in accordance with the procedure established by the laws of the Republic of Lithuania.
11.4. Parties are exempt from fulfilling obligations under these rules if they cannot be fulfilled
for unforeseen circumstances beyond the Will of the parties (Force major)

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