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Impact of phenolic composition on hepatoprotective and antioxidant effects of four desert medicinal plants
© Shehab et al. 2015
Received: 16 July 2015
Accepted: 14 October 2015
Published: 9 November 2015
Flavonoids and other polyphenols play a protective role in liver diseases and possess a high antioxidant capacity.
To compare and evaluate the antioxidant and hepatotoprotective activities of 4 deserts plants, Fagonia indica Burm. f., Calotropis procera R.Br., Zygophylum hamiense Schweinf. and Salsola imbricata Forssk. in correlation to their composition especially their phenolic content.
The influence of extracting solvent on total phenolic and flavonoidal contents was assessed spectrophotometrically. The flavonoid and other polyphenolic components of the methanol extracts were analyzed by RP-HPLC. DPPH radical scavenging potential of the different extracts was estimated. The hepatoprotective and antioxidant activities of the extracts against CCl4-induced hepatotoxicity in mice were evaluated.
The flavonol quercitrin and rosmarinic acid were major in the F. indica, C. procera and S. imbricata samples, while rutin prevailed in that of Z. hamiense. The ethanolic and methanolic extracts showed noticeable DPPH radical-scavenging activity as compared to ascorbic acid. Assessment of liver enzymes revealed that oral administration of the extracts did not show any evidence of hepatotoxicity. Moreover, protection against CCl4-induced liver damage was evident upon administration of three plants extracts namely, F. indica, C. procera and S. imbricata.
Overall, hepatotoxicity induced by CCl4 was effectively prevented by the three plants extracts through scavenging of free radicals and by boosting the antioxidant capacity of the liver. The protective effect of the plants could be attributed to their high quercitrin and rosmarinic acid contents.
KeywordsAntioxidant Flavonoids Hepatoprotective Phenolic acids
Human beings are daily exposed to various compounds that can cause serious diseases either per se or through their metabolic activation to highly reactive substances such as reactive oxygen species (ROS). Free radical induced lipid peroxidation is regarded as one of the main causes of cell membrane damage leading to various pathological conditions [1, 2]. Liver disorders are considered among the major world health problems . Despite their prevalence, morbidity and mortality rates, their current medical management is still considered inadequate. Until now, no therapy shows complete success in preventing the disease progression . Besides, the newly developed drugs used in management of chronic liver diseases are usually associated with various, and sometime intolerable, side effects . Consequently, medicinal plants, especially those with traditional use, have always been considered as a rich source of new effective drugs which could help in ameliorating liver conditions.
Among plant metabolites, phenolics are reputed to play a noticeable protective role against several health disorders . Phenolics possess various biological activities, for instance, antiulcer, anti-inflammatory , antidiabetic , antioxidant, cytotoxic and antitumor [9, 10].
Fagonia indica Burm. f. (Mushikka or white spine) (Zygophyllaceae) is a widely distributed plant in the deserts of Asia and Africa. It has been reported as medicinal herb in the scientific literature. In an earlier study, the main author reported that the plant could be considered as safe and that it contained a variety of bioactive flavonoids, sterols and triterpenoids; its alcoholic extract was found to exhibit antitumor, antimicrobial and analgesic activities . Furthermore, the methanolic extract of an Indian sample of the plant was proven to exert a hepatoprotective effect in rats; however, the mechanism of action has not yet been explored .
Calotropis procera R. Br. (Asclepiadaceae), known as Giant milkweed and locally called Al-ashkhar , has been used for treating various diseases like rheumatism, filariasis and skin disorders  and its leaf to treat jaundice . The flowers extract have been used for treating spleen, liver and abdomen diseases . Additionally, various extracts of its different parts showed antibacterial and in-vitro and in-vivo antioxidant activities [17–20]. Earlier phytochemical investigation of C. procera revealed the presence of cardenolides, flavonoids, steroids and saponins [21, 22]. The composition of the volatiles, lipoids and flavonoids of its flowers were previously investigated by the author .
Zygophyllum species (Family Zygophyllaceae) are used as anthelmintic and for management of diabetes mellitus [24, 25]. The aqueous extract of Zygophyllum album showed in vivo antihyperglycemic, antioxidant and antihyperlipidemic effects  as well in-vitro and in-vivo antioxidant properties and phenolic contents of Zygophyllum species were investigated [27–29]. Zygophyllum hamiense Schweinf. spreads largely along the Arabian Gulf area and grows on salt accumulated land. The dead trees are commonly used as firewood and the sprouts as camel food . Yet, there are no available reports regarding either the composition or biological activities of the Zygophyllum hamiense Schweinf.
Genus Salsola (Family Chenopodiaceae or Amaranthaceae) exhibited significant in-vitro antioxidant activities [31–33]. Flavonoid and other phenolic compounds from different species of Salsola have been reported. In addition, triterpenes with significant antioxidant activity were isolated [34, 35]. Salsola imbricata Forssk. (Arabic names: Harm), is a shrub wild growing in Middle East deserts; it is distributed throughout Central and Southwest Asia, North Africa, and Mediterranean countries [36, 37]. Previous phytochemical investigations and biological study of the plant were limited. Two triterpenoidal saponin glycosides were isolated and identified from the roots of the Egyptian plant . The phenolic profile of the alcoholic extract of the plant was analyzed and its contraceptive effect in male albino rats previously evaluated by the authors .
The selected plants are growing and existing in the deserts. The deserts plants almost contain variety of secondary metabolites like flavonoids and phenolic acids to protect themselves from herbivores. Thus it was valuable and interesting to perform a comparative study on some selected desert plants from different genus, Fagonia indica Burm. f., Calotropis procera R.Br., Zygophylum hamiense Schweinf. and Salsola imbricata Forssk., and to correlate their biological activities such antioxidant and hepatotoprotective to their phenolic composition.
Chemicals and drugs
Methanol, ethanol, acetone and ethyl acetate were purchased from Fisher Scientifics (UK) & Scharlam. Carbon tetrachloride (CCl4), 2,2-diphenyl-1-picrylhydrazyl (DPPH), sodium carboxymethylcellulose (CMC), Biochemical kits for determination of glutathione peroxidase (GPx), superoxide dismutase (SOD), Catalase (CAT), Thiobarbituric acid reactive substances (TBARS) were purchased from Sigma Chemical Co. (St. Louis, MO, USA) and Folin-Ciocalteu reagent was obtained from Merck (Darmstadt, Germany). All other chemicals were of analytical grade.
Whole plants of Fagonia indica Burm. f., Zygophylum hamiense Schweinf., Salsola imbricata Forssk. and leaves of Calotropis procera R. Br. were collected during September 2012 from Muhaisnah desert, Dubai, UAE. The samples were kindly identified and authenticated by Prof. Hassnaa Ahmed Hosny, Department of Botany, Faculty of Science, Cairo University, Egypt. Voucher specimens were kept at the Herbarium of the Pharmacognosy Department, Faculty of Pharmacy, Cairo University. Samples, air-dried in shade, were powdered and preserved for further study.
The acute toxicity studies of both F. indica and S. imbricata have been previously reported [11, 39]. Male albino mice weighing 20–25 g (10 per group) were used to estimate the acute toxicity of the other two plants viz., Z. hamiense and C. procera. LD50 was estimated using 50 % death within 72 h following oral administration of the extracts at different doses (250, 500, 1000, 2500 and 5000 mg/kg). The number of animals, which died during this interval, was expressed as a percentile, and the LD50 determined by probit test using a death percent versus doses’ log .
Eighty four healthy male albino mice of weights ranging from 30-35 g were used. Animals were kept under the same standard hygienic conditions (temperature 22.0 ± 2.0 °C, relative humidity 50–60 %, with 12 h day/night lighting cycle), fed with well-balanced normal diet and water supplied ad libitum. They were left for a period of one week for accommodation before performing the experiments. All animals’ investigations were performed in accordance with the ethical standards for the proper care and use of laboratory animals and upon approval of the Research Ethical Committee of the Dubai Pharmacy College, Dubai, United Arab Emirates.
The four air-dried powdered plants materials (500 g, each) were exhaustively extracted by cold maceration in 70 % ethanol (3 L X 2). The solvents were evaporated under reduced pressure at 50 °C. The residual weights for F. indica, C. procera,, Z. hamiense and S. imbricata amounted to 80.0, 44.5, 28.0 and 20.0 g, respectively. These dried extractives were saved and used for biological evaluation.
Standardization of the plants extracts
Colorimetric monitoring of phenolic content in different extracting solvents
Solvents of different polarities, namely: 70 % ethanol, methanol, acetone and ethyl acetate were individually used for extraction of the air-dried powdered plant materials (100 g, each).
The efficiency of the extracting solvent was monitored by colorimetric estimation of total phenolic and flavonoid contents using a spectrophotometer (UV-1700 Pharma Spec, Shimadzu, Japan). All experiments were carried out in triplicate.
The total phenolic contents were determined by using Folin-Ciocalteu reagent as described by Singleton and Rossi  and modified by Oktay et al. . Results were expressed as mg/g gallic acid equivalent, calculated on dry weight of plant material; serial dilutions of gallic acid (10, 20, 30, 40, and 50 \( \mu \)g/mL) were used for establishment of the calibration curve. Aliquots (1 mL, each) of tested samples and standard were, separately, added to a volumetric flask containing 9 mL of water followed by addition of 1 mL of Folin-Ciocalteu reagent and the reaction mixture was carefully blended by vortex. After 5 min, 10 mL of 7 % sodium carbonate was added to the mixture which was further incubated for 90 min, at room temperature. Finally, the absorbance was determined at 750 nm against the reagent blank.
The total flavonoid content of the prepared extracts was measured, spectrophotometrically, by the aluminum chloride method, quercetin being used as standard, by adopting the procedure described by Dewanto et al. . The plants extracts (0.1 mL each) were added to 0.3 mL distilled water followed by 5 % NaNO2 (0.03 mL) and the reaction mixture was left for 5 min, at 25 °C. Aluminium chloride (0.03 mL, 10 %) was then added and the mixture left for another 5 min, then treated with 0.2 mL of 1 mM NaOH, and finally diluted to 1 mL with water and the absorbance of the yellow colour produced read at 510 nm.
HPLC analysis of phenolics
The phenolic composition of the methanolic extract of S. imbricata was previously analysed by the authors . Methanolic extracts of the other three plants (F. indica, C. procera and Z. hamiense) were investigated in aliquots of 1g each via RP-HPLC on a Hewlett Packard HPLC System (HP 1050HPLCDADw/Data System). Analyses were carried out at operating conditions suitable for detection of either phenolic acids or flavonoids [44, 45]. For determination of phenolic acids, the apparatus was equipped with an Alltima C18 column (particle size 5 mm, 150 × 4.6 mm) and Alltima C18 guard column (5 mm) (Alltech, USA), the UV detector being set at 280 nm. Meanwhile, the separation of flavonoids was carried out on a Hypersil-ODS C18 column (particle size 5 \( \mu \)m, 4.6 × 250 mm) and the UV detector was set at 330 nm. All analyses were performed at 35∘C; gradient elution was employed using acetonitrile-acetic acid mixtures as mobile phase, at a flow rate of 1 mL/min, and the injected volume was 10 \( \mu \)L for both standard and tested samples. Authentic reference samples were prepared by diluting stock solutions with methanol to afford a 50 \( \mu \)g/mL final concentration. Identification of individual components was performed by comparing their retention times with those of the available standards similarly analyzed. Quantification was based on peak area computation using the external standard method. All analyses were carried out in triplicate. Samples were analyzed at 280 and 330 nm, respectively.
2,2-Diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay
Where A0 is the absorbance of the control, A1 is the absorbance in the presence of the sample and A2 is the absorbance of the sample under identical conditions as A1 with ethanol instead of DPPH solution. Ascorbic acid (AA) was used as a reference compound. IC50 values were calculated. Samples were analyzed in triplicate.
Animals groups and corresponding treatment with vehicle, tested samples and carbon tetrachloride
i.p. CCl4 injection
F. indica extract
Z. hamiense extract
C. procera extract
S. imbricata extract
The first group served as normal control and during the experiment received vehicle only (1 % CMC). The second group was given 1 % CMC solution for 14 days before CCl4 intoxication and served as a hepatotoxicity control group. For each plant, three groups were devoted; the first was treated with the plant extract twice daily for 14 days while the second and the third groups were given the plant extract in two different doses for 14 days as shown in Table 1. After the 14-days treatment period, hepatic injury was induced by intraperitoneal injection of 1.0 ml/kg of CCl4 and the mice were sacrificed six hours after the last treatment.
Assay of liver enzyme
Blood samples were collected from the hearts with the use of 5 ml sterile syringe individually for each mouse and transferred into non-heparinized tubes immediately and used later for the analyses of liver enzymes: alanine aminotransferase (ALT), aspartate aminotransferase (AST) and alkaline phosphatase (ALP).
Estimation of oxidative parameters
Liver samples were surgically removed from the mice immediately and stored in -80° for further antioxidant enzyme assay including activity of catalase, superoxide dismutase, glutathione peroxidase and TBARS as per the method described by Abu-Gharbieh et al. . The levels of total protein were determined in the serum of experimental animals by using the Lowry method and the bromocresol green method, respectively [48, 49].
Liver samples were suspended in 10 % formaldehyde for histological evaluation. These tissues were processed and embedded in paraffin wax. Sections of 5 μm in thickness were cut and stained with hematoxylin and eosin (H&E) and Periodic acid-Schiff (PAS) stains.
The results were reported as Mean ± Standard Deviation (S.D) from three repeated determination. The data obtained were statistically analyzed using One-way analysis of variance ANOVA, followed by Dunnett’s multiple comparison test (DMCT). P-value of < 0.05 was considered as statistically significant.
Standardization of the plants extracts
Influence of extracting solvent on total phenolic and flavonoid contents
Total Flavonoid and phenolic acid contents of the different extracts of Fagonia indica, Calotropis procera, Zygophyllum hamiense and S.imbricata
Total flavonoid content g quercetin/100 g
Total phenolic content mg GAE/g
Ethyl acetate extract
Ethyl acetate extract
S. imbricata a
Spectrophotometric evaluation of the total phenolic content (expressed as mg gallic acid equivalent (mg GAE)/g dry plant material) and flavonoid content (as quercetin g/100 g dry plant material) in the extracts of F. indica, C. procera and Z. hamiense revealed variable efficiency. Ethanol was found to be the best solvent for extracting the F. indica sample with highest concentration of phenolics (4 mg GAE/g dry plant wt.) and flavonoids (3 g quercetin (Q) % w/dry plant wt.). Concerning C. procera, the highest flavonoid content was detected when using acetone (0.9 g Q % w/dry wt.), while both ethanol and acetone extracts were found the richest in total phenolics (4 mg GAE/g dry wt.). On the other hand, the maximum flavonoid amount (1.48 %) was extracted with acetone in Z. hamiense, meanwhile ethyl acetate and ethanol appeared of close efficiencies for solubilisation of total phenolics (4 and 3.61 mg GAE/g dry plant wt., respectively). Finally, among the tested plants and including S. imbricata, the most enriched sample in both total phenolics and flavonoids was F. indica (4 mg GAE/g of plant dry wt. and 3 g % w/dry wt., expressed as quercetin respectively).
RP-HPLC profiling of phenolics
Phenolics identified by RP-HPLC analysis (at \( \lambda \) = 280 nm) of the methanolic extracts of Fagonia indica, Calotropis procera, Zygophyllum hamiense and S.imbricata
Relative area %
S. imbricata a
Total identified constituents
Phenolics identified by RP-HPLC analysis (at \( \lambda \) = 330 nm) of the methanolic extracts of Fagonia indica, Calotropis procera, Zygophyllum hamiense and S.imbricata
Relative area %
S. imricata a
Total identified constituents
DPPH free radical scavenging activity
DPPH is a stable free radical and its noticeable purple color shows absorption at 517 nm. Antioxidants scavenge the free radical by donating a hydrogen atom and the color of the DPPH assay solution becomes yellowish, resulting in a decrease of the absorbance. DPPH free radical scavenging activity is considered as in vitro screening for possible in vivo antioxidant potentialities.
Acute toxicity study
The acute toxicity study was essential to evaluate the plants extracts safety and to determine the tested doses.
The LD50 of both F. indica and S. imbricata extracts had been previously reported and they were found to be safe up to 4 and 5 g/kg respectively [11, 39]. Z. hamiense was found to be safe up to dose 5 g/kg while C. procera leaves extract was safe up to 3 g/kg. No signs of morbidity or behavioral changes in any of the treated groups of animals during the period of observation. The safety margin of the ethanolic extracts of the plants under investigation is highly encouraging the biological evaluation.
Effects on liver enzymes and histological findings
The plants extracts were given twice daily over two weeks in order to evaluate any possible hepatotoxicity caused by the plants extracts themselves. Moreover, this was useful to evaluate the effect of the extracts on the antioxidant enzyme system apart from the CCl4 challenge.
Evaluation of the hepatotoxic effect of the plant extracts on the biochemical parameters with twice daily oral administration in mice
290.1 ± 54.0
350.2 ± 113.6
155.3 ± 65.5
211.0 ± 35.8
253.3 ± 24.0
850.0 ± 63.2
800.0 ± 235.8
520.3 ± 220.0
404.2 ± 37.2b
653.3 ± 78.8
180.0 ± 20.3
113.3 ± 16.7a
105.6 ± 15.4a
98.2 ± 9.3b
60.0 ± 23.1b
CAT kU/g protein
462.0 ± 21.1
461.6 ± 14.9
428.750 ± 10.3
413.950 ± 11.4
486.3 ± 18.0
GSH-Px U/g protein
1.3 ± 0.1
1.3 ± 0.05
1.3 ± 0.07
1.6 ± 0.06
1.31 ± 0.14
SOD μg/g protein
34.6 ± 2.9
35.5 ± 2.7
32.8 ± 1.1
35.5 ± 1.4
32.1 ± 1.4
TBARS (nmol/g prot.)
0.49 ± 0.02
0.39 ± .03
0.046 ± 0.03
0.038 ± 0.02
0.035 ± 0.4
Evaluation of the protective effect of the plants extracts on the biochemical parameters of liver in CCl4-induced hepatic damage in mice
290.1 ± 54.0
1736.7 ± 161.2a
2166.7 ± 157.8b
1064.0 ± 264.9c
1416.7 ± 105.8
950.3 ± 84.4
1054.3 ± 117.5c
801.7 ± 76.0c
1135.0 ± 127.9c
476.7 ± 151.0c
850.0 ± 63.2
1736.7 ± 215.1a
1310.0 ± 181.5b
926.2 ± 258.6c
756.7 ± 128.6c
783.3 ± 80.1c
787.8 ± 69.6c
922.7 ± 65.4c
647.5 ± 62.8c
530.0 ± 120.8c
180.0 ± 20.3
150.2 ± 55.7
125.0 ± 22.5
124.3 ± 17.4
106.7 ± 24.0
113.3 ± 29.1
51.8 ± 4.7
59.5 ± 6.1 c
110.0 ± 14.7
63.3 ± 8.8
CAT kU/g protein
462.0 ± 21.1
241.3 ± 11.4a
307.2 ± 9.2c
392.200 ± 9.4c
225.1 ± 10.5
259.1 ± 5.1
324.7 ± 25.8b
335.0 ± 25.0c
356.2 ± 24.1c
374.9 ± 10.7c
GSH-Px U/g protein
1.3 ± 0.1
0.85 ± 0.06a
1.1 ± 0.2
1.2 ± 0.2
0.72 ± 0.1
0.94 ± 0.2
1.4 ± 0.06
1.4 ± 0.06
0.91 ± 0.06
1.39 ± 0.19b
SOD μg/g protein
34.6 ± 2.9
22.0 ± 2.4a
26.7 ± 1.8
32.9 ± 1.6c
21.1 ± 1.7
23.6 ± 1.5
22.7 ± 1.2
31.5 ± 1.1b
24.8 ± 0.5
26.4 ± 1.3
TBARS (nmol/g prot.)
0.049 ± 0.02
0.54 ± 0.20a
0.12 ± 0.09c
0.085 ± 0.05c
0.42 ± 0.2
0.36 ± 0.4
0.14 ± 0.07c
0.06 ± 0.01c
0.11 ± 0.05c
0.071 ± 0.02c
Pre-treating the mice with F. indica, C. procera and S. imricata extracts at the highest and lowest doses for 14 days prior CCl4 administration showed significant reduction in serum levels of ALT, AST but not ALP enzymes in a dose response manner (p-value less than 0.05 and 0.01, respectively). Those findings are supported by the histological features; hepatocytes renewal and regeneration with mild glycogen depletion were observed with F. indica, C. procera and S. imbricata only as shown in Figs. 2c, d and e. On the other hand, pretreating the animals with Z. hamiense extract at both doses showed significant reduction in AST level (p < 0.01) though ALT and ALP levels were not changed (p > 0.05). Furthermore, histological study showed centralized gross glycogen depletion (Fig. 2f).
Effects on antioxidant enzymes and TBARS contents
Administration of CCl4 markedly depleted the antioxidant enzymes (CAT, GSH-Px and SOD) in the mice livers (Table 6). Nevertheless, CCl4 increased significantly (p < 0.01) the hepatic lipid peroxidation that is expressed by high TBARS content. Whereas the administration of plants extracts twice daily for two weeks did not result in significant enhancement of the antioxidant enzymes nor reduction in the TBARS content as shown in Table 5.
Pretreating the animals with the plants extracts at different doses opposed significantly the reduction in the antioxidant enzymes and reduced markedly the TBARS content induced by CCl4 except for Z. hamiense extract that has no potential effects on the antioxidant enzymes as well as the TBARS content.
Liver diseases are one of the major causes of morbidity and mortality and affects people of all ages throughout the world especially in the Arab countries. The drugs that are currently available to treat this condition pose serious drawbacks , which justifies the search for new hepatoprotective agents. In this context, the use of plants extracts and isolates therefrom with hepatoprotective properties can provide beneficial means for prevention and treatment of liver conditions.
Alanine aminotransferase (ALT), aspartate aminotransferase (ASL) are present mostly in the hepatic and biliary cells . These enzymes are usually released from the hepatocytes and leak into circulation causing increase in their serum levels under hepatocellular injury or inflammation of the biliary tract cells resulting predominantly in an elevation of the alkaline phosphatase levels. On the other hand, elevation in ALP is usually indicates a cholestatic liver diseases.
Chronic administration of the four plants extracts for two weeks resulted in significant reduction in alkaline phosphatase levels. This shows that no possible cholestasis occurred at the dose levels tested since a rise in plasma ALP level is usually a characteristic finding in cholestatic liver diseases . This was further confirmed by the fact that there were no significant changes in ALT and AST. Accordingly the plants extracts did not exhibit any signs of hepatotoxicity on chronic administration.
In this study, we were focusing on the liver injury that always accompanied by elevated levels of serum hepatic enzymes that are indicative of cellular leakage . The hepatotoxic effects induced by CCl4 are related to its active metabolite trichloromethyl radical, •CCl3, this is manifested by marked elevation in the serum liver enzymes namely AST, ALT, ALP . Antioxidant enzymes, particularly, CAT, GSH-Px and SOD play a vital role in protecting cells against oxidative damage. Administration of CCl4 to the animals leads to induction of hepatic oxidative stress that is characterized by significant decrease in CAT, GSH-Px and SOD activities and increased TBARS content in liver tissue .
Dose selection for the subsequent biological study for the three plants (Zygophyllum hamiense, Calotropis procera and Salsola imbricata) was based on their LD50 values (less than 1/10 of LD50). Moreover, the major influencing factors to select smaller doses for Fagonia indica extract (5 and 10 mg/kg) was the extremely high contents of flavonoid and phenolic acid compared to the other plants extracts. Additionally, similar doses of Fagonia indica were tested previously for its analgesic effect .
The three plants, Fagonia indica, Calotropis procera and Salsola imbricata possessed high antioxidant and hepatoprotective activities. These effects may be attributed to the presence of high content of different groups of phenolic compounds including flavonoids aglycone and/or glycosides and phenolic acids especially quercetrin glycoside and rosmarinic acid (Fig. 3) that have been earlier reported to exhibit strong antioxidant and hepatoprotective effects [58, 59]. Moreover, hesperidin and its aglycone hesperitin, apigenin and cinnamic acid that exhibited strong antioxidant and hepatoprotective activities [60–64] were detected in all plants extracts except Zygophyllum hamiense of which rutin was the predominant flavonoid (10.71 %). The presence of high rutin concentration in Zygophyllum hamiense extract explains its in vitro free radical scavenging activity and possibly it’s in vivo effect on AST level. Anyway, the plant could not be considered as hepatoprotective since ALT level, that is thought to be more specific for hepatic injury , was not significantly improved. Accordingly, the lack of other flavonoids especially quercetrin that presents in the other three plants explains the weak in vivo antioxidant and hepatoprotective activities of Zygophyllum hamiense against CCl4 intoxication.
Interestingly, it was found that although S. imbricata contains the lowest amount of phenolic contents, its efficacy in reducing ALT level in CCL4 treated mice still high. This can be explained by the presence of triterpenoid saponin. Two triterpenoidal saponin glycosides were isolated and identified from the S. imbricata, namely, salisomide and salisoflavan , and it is reported in literature that saponins interact with and increase permeability of the mucosal cells in the gut and enhance the absorption of various nutrient [65, 66]. Therefore, saponin enhanced the absorption of phenolic compounds. Additionally, saponins themselves possess antioxidant activity that contributes to efficacy of the phenolic compounds to protect against liver injury induced by CCL4 [67, 68].
Based on that, it was found that F. indica, C. procera and S. imbricata possess hepatoprotective effects by preventing the induction of oxidative stress and enhancing the hepatic antioxidant defences involving CAT, GSH-PX and SOD enzymes and were highly efficient in reducing the TBARS content in liver tissue. Accordingly, the three plants could be added to the growing list of medicinal plants. Further clinical studies are needed to evaluate their clinical significance.
In conclusion, this study evidences the efficiency of the ethanolic extracts of F. indica, C. procera and S. imbricata in preventing the CCl4-induced hepatotoxicity in mice through scavenging of free radicals and by boosting the antioxidant capacity of the liver. The bioactive antioxidant principles detected in the extracts are probably responsible for this hepatoprotective effect. Therefore the parent plants could be considered as a potential source of safe protective from liver diseases or for reduction of undesirable hepatotoxic side effects of some drugs.
The authors want to thank Professor Saeed Ahmed Khan - Dean of Dubai Pharmacy College for his support in all the research steps.
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