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ISSN: 2161-1009
Biochemistry & Analytical Biochemistry

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Using of Coffee and Cardamom Mixture to Ameliorate Oxidative Stress Induced in γ-irradiated Rats

Refaat G. Hamzaa* and Nadia N. Osman

Department of food irradiation, Atomic Energy Authority, Cairo, Egypt

*Corresponding Author:
Refaat G. Hamzaa
Department of Food Irradiation
Atomic Energy Authority, 3 Ahmed El Zomor St.
El Zohour District, 8th District, Nasr City, Cairo
Tel: +201224109349
Fax: +20222749298
E-mail: [email protected]

Received Date: July 06 2012; Accepted Date: July 19, 2012; Published Date: July 30, 2012

Citation: Hamzaa RG, Osman NN (2012) Using of Coffee and Cardamom Mixture to Ameliorate Oxidative Stress Induced in γ-irradiated Rats. Biochem Anal Biochem 1:113. doi: 10.4172/2161-1009.1000113

Copyright: © 2012 Hamzaa RG, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Human exposure to ionizing radiation induced overproduction of free radicals leading to oxidative stress. This study aims to evaluate the possibility of using of coffee and cardamom mixture, as natural antioxidant compounds, to ameliorate the damage effect of oxidative stress. Phenolic contents in coffee and essential oils in cardamom were identified by using HPLC chromatography and GC/MS analysis. Four groups of adult male rats were used; the control group (A), the second group (B) received orally mixture extract of coffee and cardamom (60 mg/100g body weight) for 8 weeks, the third group (C) γ-irradiated (6 GY) and the fourth group (D) received orally mixture extract for 8 weeks and exposed to γ-irradiation at the 4th week. The results revealed that the administration of mixture extract of coffee and cardamom were significantly reduced the damage effect induced by γ-irradiation exposure. Accordingly, it could be concluded that, via the adjustment of the antioxidant status, decreasing the releasing of lipid peroxides and the subsequent amending of different biochemical parameters and some hormones, mixture of coffee and cardamom could ameliorate the hazardous effects of oxidative stress induced by irradiation exposure.


Ionizing radiation; Coffee and cardamom; Phenolic; Essential oil; Antioxidants; Hormones


Ionizing radiation being used in large number of therapeutic, industrial and other applications of nuclear power generation and developing new varieties of high yielding of new crops and enhancing storage-period of food materials[1-3]. In addition, Gamma radiation is associated with the generation of reactive oxygen species (ROS), causing oxidative damage particularly to various tissues and induce damages in DNA and cellular membrane [3-5].

A number of medicinal plants evaluated for their radioprotective efficacy have shown protective effects against the damaging effects of ionizing radiation. Plant extracts eliciting radioprotective efficacy contain a plethora of compounds including antioxidants, immunostimulants, cell proliferation stimulators, anti-inflammatory and antimicrobial agents, some of which may act in isolation as well as in combination with other constituents from the same plant [6-10].

Coffee (Coffea Arabica) has scientific interests because it is a rich source of a number of phenol compounds with antioxidant effects in vitro and contains several species of xanthines such as caffeine, teobromine and theophylline [11,12]. Main polyphenols in coffee are chlorogenic acids such as caffeic, ferulic, and p-coumaric acid, caffeoylquinic acid, with 5-O-caffeoyl-quinic acid [13,14]. Metaanalyses have concluded that moderate to high coffee consumption (three to six cups/day) is not significantly associated with an increased risk of coronary death or heart attack [15,16]. In addition, habitual coffee drinking has been associated with the prevention of diseases including cancer, cardiovascular disorders, obesity and diabetes as well as neurodegenerative disorders [15-20].

Cardamom (Elettaria cardamomum Maton), the Queen of all spices has a history as old as human race [21]. The major use of Cardamom on worldwide is for domestic culinary purpose and in medicine. The aroma and medicinal properties of cardamom are due to the volatile oil present in it and it is obtained from the seeds by steam distillation. The composition of cardamom oil has been studied by various workers and the major compounds found were 1, 8 cineole (20-60%) and α-terpinyl acetate (20-55%) [21]. Studies have implicated cardamom’s potential therapeutic value as an inhibitor of human platelet aggregation [22] and it has antihypertensive, gastroprotective, anticancer and antidiabetic properties [23]. Cardamom has antioxidant properties and can increase levels of glutathione and antioxidant enzymes in the body [24,25]. Reports are available on the antioxidant activity of extract of cardamom from different countries [26-30].

Due to oxidative stress induced by γ-irradiation exposure and the occurrence of different tissue damage, this study aims to evaluate ameliorating effects of coffee and cardamom mixture against biochemical changes induced by γ-irradiation.

Materials and Methods


Coffee and cardamom powder as well as standard commercial rodent diet were purchased from local herbal market (Cairo, Egypt).

Preparation of coffee and cardamom mixture

The mixture of coffee and cardamom were prepared by adding 5 g of cardamom powder for 100 g of mixture (95 g coffee + 5 g cardamom).

Extraction and determination of phenolic compounds of coffee

Grounded dry powder of coffee (10 g) was weighed into a test tube. A total of 100 ml of 80% aqueous methanol was added, and the suspension was stirred slightly. Tubes were sonificated twice for 15 min and one left at room temperature (~ 20°C) for 24 h. The extract was centrifuged for 10 min (10 min, 1500 x g), and supernatants were filtered through a 0.2 μm Millipore membrane filter then 1-3 ml was collected in avail for the HPLC analysis of phenolic compounds. According to the method of Goupy et al. [31], phenolic compounds of coffee were analyzed with high performance liquid chromatography (Hewllet Packared series 1050) equipped with autosampling injector, solvent degasser, ultraviolet (UV) detector set at 280 nm and quarter HP pump (series 1050). The column temperature was maintained at 35°C. Gradient separation was carried out with methanol and acetonitrile as a mobile phase at flow rate of 1 ml/min. The phenolic standards from Sigma Co. were dissolved in a mobile phase and injected into HPLC. Retention time and peak area were used to calculation of Phenolic compounds concentration by the data analysis of HEWLLET Packared Software.

Essential oil determination

Separation and identification of essential oil components were performed by using Gas chromatography instrument, Model Hewlett-Packard- MS (5970) series II at the Agriculture Research Center, Giza, Egypt. Condition analysis as follows: Column: 30 m hp Methyl silicon 0.1 mm; Temperature: Initial 60°C; Rate: 3°C / min up to 240°C; Carrier gas: Helium 1.0 ml/min; Injection port; Temperature: 250°C; Detector temperature: 270°C; Integration: By using HP software Data; Injection volume: 0.3 ml. The isolated peaks were identified by matching with data from the library of mass spectra and compared to those of authentic compounds and published data [32]. Quantitative determination was carried out based on peak area integration.

Radiation facility

Whole body gamma irradiation at dose level of 6 Gy was performed using a Canadian gamma cell-40, (137 Cs) housed at the National Center for Radiation Research and Technology (NCRRT), Cairo, Egypt. The dose rate was 0.44 Gy/min at the time of the experiment.

Experimental animals

Adult male albino rats, reared in NCRRT animal house, were used in the present experiments. Matched weight animals (150±10 g) were selected and housed in plastic cages under controlled condition and fed on standard commercial rodent diet. Gamma irradiated rats were orally received extract of coffee and cardamom mixture at dose level (60 mg/100 g body weight/day) [20].

Experimental design

Animals (28 rats) were randomly divided into 4 groups each of six animals as follows:

     Group A: Rats fed on balanced diet for 8 weeks, served as control.

     Group B: Rats fed on balanced diet and received orally the extract of coffee and cardamom mixture at a dose level of 60 mg/100 g body weight for 8 weeks, served as positive control.

     Group C: Rats fed daily on balanced diet for 8 weeks and exposed to γ-irradiation (6 GY) at the 4th week, served as negative control.

     Group D: Rats fed daily on balanced diet and received orally the extract of coffee and cardamom mixture for 8 weeks and exposed to γ-irradiation at the 4th week.

At the end of the experiment, animals from each group were sacrificed 24 hrs after the last dose of treatment. Blood sample were collected though heart puncture after light anesthesia and allowed to coagulate and centrifuged to obtain serum for biochemical analysis. Also, liver was removed for biochemical investigation.

Biochemical analysis

The lipid peroxidation was determined colorimetrically as malondialdehyde (MDA) [33]. Hepatic glutathione content (GSH) and activity of superoxides dismutase (SOD) were measured by the method of Gross et al. [34] and Minami and Youshikawa [35], respectively. Serum glucose was evaluated by the method of Trinder [36]. The activity of serum aspartate transaminase (AST) and alanine transaminase (ALT) were assayed by the method of Reitman and Frankel [37], as well as serum gamma glutamyl transferase (GGT) was assessed according to Rosalk, [38]. In addition, total cholesterol (TC), triglycerides (TG) and high-density lipoprotein-cholesterol (HDL-C) were determined according to procedure described by Allain et al. [39], Fossati and Prencipel, [40] and Demacker et al. [41], respectively while low-density lipoprotein cholesterol and very Low-density lipoprotein-cholesterol were evaluated according to Friedwald et al. [42] and Norbert [43] formulas, respectively by the following equations: LDL-C (mg/dl) = TC - (TG/5+HDL-C), vLDL (mg/dl) = TG/5. Finally, the serum testosterone was analyzed by the enzyme linked immunosorbent assay (ELISA) according to the method of Engrall and Perlman, [44] and also insulin hormone was determined by radioimmunoassay kit supplied by Diasari, Italy.

Statistical analysis

Statistical analyses were performed using computer program Statistical Packages for Social Science [45] and values compared with each other using suitable tests.


The phenolic compounds of coffee were identified by HPLC against standard compounds and the results were listed in Table 1. The most abundant components of coffee were caffeine, pyrogallol and caffeic “820.59, 65.23 and 17.98 mg/100g”, respectively.

Phenolic compounds mg/100g
Pyrogallol 65.23
Gallic 4.40
Protocatechouic 8.15
Catechin 8.67
Caffeic 17.98
Caffeine 820.59
Ferulic 2.40
P.coumaric 2.83
Ellagic 15.42
Cholchecien 7.32
Salicylic 16.69
Cinnamic 5.50

Table 1: Phenolic compounds of coffee (mg/100g).

The essential oil contents found in cardamom were analyzed and the results showed that the main essential oil components were terpenyl acetate (60.65%) and 1,8 Cineol (13.63%) (Table 2).

Essential oil %
α-Pinene 1.36
Sabimene 1.08
Limonene 7.12
1,8 Cineol 13.63
γ-Terpinene 0.25
Terpinolene 0.31
Linaiool 0.92
Terpineol 5.10
Octyl acetate 0.05
Linalyl acetate 2.33
Germaniol 0.57
Terpenyl acetate 60.65
Neryl acetate 2.11
Total unknown 4.52

Table 2: Essential oil contents of cardamom.

Results of irradiated rats revealed a significant increase in the level of MDA and a remarkable decrease in the content of GSH and SOD activity while irradiated rats received oral extract of coffee and cardamom mixture had a lower level of MDA accompanied by increasing in GSH level and the activity of SOD (Table 3).

Parameters A B C D
MDA (n mol/ml) 178.71 ±0.82c 166.46 ±1.03d 396.07 ±1.52a 211.26 ±0.85b
GSH (mg/tissue) 24.62 ±0.35a 25.58 ±0.46a 15.48 ±0.22c 22.18 ±0.41b
SOD (U/mg protein) 43.60 ±0.65a 43.86 ±0.71a 36.65 ±0.47c 40.96 ±0.47b

Table 3: Effect of coffee and cardamom mixture extract administration on MDA, GSH and SOD activity of γ-irradiated rats.

On the other hand, the data revealed a significant elevation in AST, ALT and GGT activity accompanied by high glucose level in irradiated group compared to control group. Irradiated rats treated with the mixture extract had a significant reduction in the activity of the above mentioned liver enzymes and glucose concentration (Table 4).

Parameters A B C D
AST U/ml 27.57 ±0.49c 26.09 ±0.43c 49.66 ±0.90a 32.35 ±0.29b
ALT U/ml 15.92 ±0.05c 15.16 ±0.16c 47.49 ±0.54a 29.31 ±0.55b
GGT U/ml 3.24 ±0.01c 3.20 ±0.02c 6.13 ±0.02c 4.46 ±0.04b
Glucose (mg/dl) 112.49 ±1.34c 109.46 ±0.68c 195.95 ±1.69a 126.00 ±0.96b

Table 4: Effect of coffee and cardamom mixture extract administration on the activity of some liver enzymes and glucose level of γ-irradiated rats.

Also, results in Table 5 indicated that exposure of rats to γ-irradiation resulted in a significant increase in TC, TG, LDL-C and vLDL-C concentration and decrease in the level of HDL-C. However, administration of coffee and cardamom mixture extract induced moderate reduction in the bad effect obtained due to whole body γ- irradiation.

Parameters A B C D
TC mg/dl 152.48 ±0.83c 149.45 ±1.09c 208.13 ±1.26a 186.42 ±1.17b
TG mg/dl 112.47 ±0.91d 108.41 ±0.90c 181.45 ±1.06a 156.50 ±0.86b
HDL-C mg/dl 45.15 ±0.72a 47.44 ±0.65b 37.53 ±0.82d 41.35 ±0.51c
LDL-C mg/dl 84.84 ±0.22d 80.32 ±0.35c 134.31 ±0.44a 113.77 ±0.76b
vLDL-C mg/dl 22.49 ±0.18d 21.68 ±0.18c 36.29 ±0.21a 31.30 ±0.17b

Table 5: Effect of coffee and cardamom mixture extract administration on lipid profile of γ-irradiated rats.

The reducing effect of γ-irradiation on the level of testosterone and insulin were obtained in the Figure 1 and 2, while it was noticed that the treatment by using coffee and cardamom mixture to eliminate the adverse effects of γ-irradiation pointed to an obvious enhancement in the level of the both hormones.


Figure 1: Effect of administration of mixture extract on testosterone level of γ-irradiated rats.


Figure 2: Effect of administration of mixture extract on insulin level of γ-irradiated rats.


Exposure to ionizing radiation might happen as a consequence of military or industrial accidents, or after therapeutic treatments [46,47]. Also, it is well known that ionizing radiation generates reactive oxygen species (ROS) that interact with cellular molecules, including DNA, lipids, and proteins [48].

Coffee polyphenolic components (cafestol, kehweol, cholinergic acid and caffeine) [49], as well as essential oil of cardamom [21] function as an antioxidant by scavenging reactive oxygen species and have chemoprotective and anit-inflammatory property [26,50] reverse lipid peroxidation, enzymatic leakage and enhance cellular antioxidant defense mechanism, reported by Dreosti et al. [51].

Results in the present study demonstrated a significant increase in lipid peroxidation (MDA) and reduction in GSH concentration and SOD activity due to exposure of rat to γ-irradiation (6 Gy). The results are in agreement with those recorded by several authors [52-54]. They recorded a significant depletion in the antioxidant system accompanied by enhancement of lipid peroxides after whole body gamma-irradiation. This could be due to an enhanced utilization of the antioxidant system as an attempt to detoxify the free radicals generated by radiation exposure.

On the other hand, results of gamma irradiated rats received oral extract of coffee and cardamom mixture obtained a significant low level of liver MDA and high GSH concentration and SOD activity in comparison with irradiated group. Therefore, these results reflect the protective effects of both coffee and cardamom against the damage effect of γ-irradiation. Abreu et al. [55] found that the consumption of coffee decreased the lipid peroxidation of the membranes; increased the concentration of glutathione, a potent endogenous antioxidant; and increased the activity of two antioxidant enzymes, glutathione reductase and superoxide dismutase. Undoubtedly, these beneficial effects of coffee on antioxidant properties are partly due to caffeine, kahweol and cafestol [56-58]. In addition to the effect of coffee, cardamom also have a potential antioxidants such as 1, 8-ceineoil and alphaterpineol, protocatechualdehyde and protocatechuic acid which have health benefits by inhibiting lipid peroxidation and activation of antioxidant enzymes [24,25].

The effect of γ-irradiation on liver function in this study were determined by detection of AST, ALT and GGT activity which were highly increased under the effect of γ-irradiation, while the increase in these enzymes significantly reduced by administration of the extract of coffee and cardamom mixture to irradiated rats. Also, the results indicted the increasing effect of γ-irradiation exposure in the level of serum glucose which highly declined after treatment with the mixture extract.

The significant increase of serum transaminases activity may be attributed to a radiation induced state of hypoxia in the parenchymal cells of contracting fibrous tissue as well as to extensive body tissue breakdown includes liver parenchyma and renal tubules and that can cause change in tissue permeability and could enhance the release of the transaminase enzymes from their subcellular sites of production to extracellular and consequently to the blood circulation [59,60]. On the other hand, the increased glucose level might be related to endocrine abnormalities induced by irradiation that promote the secretion of biologically active peptide which has relation carbohydrate metabolism by increasing gluconeogenesis in liver [61].

The effect of both coffee and cardamom resulted in significant enhancement in liver function and serum glucose level by reducing the damage effect induced by γ-irradiation. The negative association between coffee and the development of increased serum AST, ALT and GGT activity might be to some extent to caffeine, which is one of the major ingredients contained in coffee with various biological actions and possibly plays a crucial role in the observed associations of coffee intake [63]. Also, the coffee constituent chlorogenic acid may have the potential to influence glucose metabolism processes to prevent hyperglycemia by inhibition activity of glucose-6-phosphatase, an important regulator of blood glucose levels [63,64].

As well as, Abdel-Wahab and Aly [65] observed that treatment with clove and cardamom effectively decreased liver enzyme levels in the serum. This can be attributed to the presence of antioxidant in clove and cardamom which contain phenolic compounds that can act by scavenging free radicals. Also, the lowering effect of cardamom on glucose level was observed by El-Yamani [23], who studied the hypoglycemic effect of cardamom as one of spices that possess antioxidant compounds.

The present study showed a significant increase in cholesterol, triglycerides and LDL-C levels associated with reduction in the concentration of HDL after exposure to 6 Gy irradiation compared to control group. In contrast, a moderate decrease in TC, TG and LDL-C contents and rise in HDL level were observed in group D. El-Khafif et al. [66] and Mansour [67] reported that whole body exposure to gamma radiation induced high level of serum cholesterol fractions due to its release from tissues, destruction of cell membranes and increase rate of cholesterol biosynthesis in the liver and other tissues. Also, irradiation could modify low and high density lipoproteins metabolism indirectly through the action of various inflammatory products. Gamma irradiation might decrease the lipoprotein lipase activity in adipose tissue, leading to reduction in the uptake of triacylglycerols.

Choi et al. [20] reported that the cholesterol-raising effect of coffee has long been controversial, and observe significant increase in TC, decrease in HDL-C, and no effect on plasma TG levels after coffee intake (10 cups/day) and the authors attributed this cholesterol-raising effect of coffee to its contents of diterpenes cafestol and kahweol. Therefore, the moderate effect of coffee and cardamom mixture intake on lipid profile in this study was related to the effect of cardamom. The cholesterol and triglyceride lowering effect of cardamom reflecting its protective hepatocellular effects and the ability of its phenolic contents and essential oil to reduce the hyperlipidemia [68-70]. Furthermore, it has been reported that spices may inhibit hepatic 3-hydroxyl-3-methylglutaryl coenzyme A reductase activity, resulting in lowering hepatic and serum cholesterol levels [71].

It was well clear that gamma irradiation induced a significant decrease in testosterone and insulin hormones concentration and these results agreed with those of Michael and Amer [2] and Liu et al. [72] who recorded decreased testosterone level after whole-body irradiation dose of 4 and 5 Gy due to alterations in DNA-single strand break, cell apoptosis and oxidative stress. Also, Popoff and Kapich [73] found a positive correlation between a decline in testosterone affinity and exposure to gamma irradiation. In addition, the lowering effect of γ-irradiation exposure on insulin level was observed due to production of free radicals that induced oxidative stress resulted in reduction in insulin secretion and DNA damage [3].

This study reported that coffee and cardamom ingestion to irradiated rats elevates testosterone secretion. When cardamom is combined with coffee it has especially strong effects on the genital reactions and sexual function and it was traditionally used in Arabic coffee for this purpose. Sanovane et al. [74] reported that cardamom intake stimulates the nervous system which in turn stimulates the pituitary gland to increase the secretion of hormones induced gonads to produce testosterone. In addition, previous animal experiments had found that coffee infusion elevated plasma concentrations of testosterone and that related to the effect of bioactive contents of coffee [75].

Also, coffee and cardamom administration reduced the damage effect due to γ-irradiation exposure and enhance the elevation of insulin concentration in the serum of γ-irradiated rats. Effects of coffee and cardamom were related to their antioxidant contents such as caffeine and terpenyl acetate which reduced oxidative stress by scavenging free radicals and stimulate pancreatic cells to secrete insulin [21,76].


The observed improvement in the antioxidants, liver functions, lipid profile and level of testosterone and insulin in irradiated rats suggested that the radioprotective effect of the mixture of coffee and cardamom was attributed to the phenolic compounds and essential oil contents which possess antioxidant potential can reduce the oxidative stress induced by γ-irradiation exposure.


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