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Khasiat Kulit Buah Delima: Analisis Kimia Sifat Biologi In Vitro Dan In Vivo Bahagian Kulit

Khasiat Kulit Buah Delima: Analisis Kimia Sifat Biologi In Vitro Dan In Vivo Bahagian Kulit

Oleh:   Kaliyan Barathikannan,1 Babu Venkatadri,1 Ameer Khusro,1 Naif Abdullah Al-Dhabi,2 Paul Agastian,1 Mariadhas Valan Arasu,corresponding author2 Han Sung Choi,3 and Young Ock Kimcorresponding author4


Latarbelakang                                                                                                                                                                                     Kandungan bahan perubatan dalam buah delima telah menarik perhatian manusia untuk membuat kajian.
Tujuan kajian ini dijalankan ialah untuk menilai in vitro kesan perencatan α-glucosidase, antimikrob, paras antioksidan dan in vivo mengenai aktiviti anti-hyperglycemic daripada Punica granatum (delima) buah-buahan ekstrak kulit menggunakan kaedah elegans Caenorhabditis.
Pelbagai aktiviti antioksidan invitro ekstrak kulit buah-buahan telah ditentukan oleh protokol standard manakala aktiviti anti-bakteria dan anti-kulat telah ditentukan menggunakan penyebaran cakera dan kaedah microdilution. Aktiviti anti-hyperglycemic daripada kulit buah diperhatikan menggunakan pendarfluor mikroskop dalam vivo kajian.
Ekstrak etil asetat dari bahagian kulit buah delima (PGPEa) menunjukkan perencatan α-glucosidase hampir 50% pada kepekatan IC50 285,21 ± 1.9μg / ml berbanding heksana dan metanol ekstrak.
Jumlah kandungan fenolik adalah paling tinggi (218,152 ± 1.73mg catechol setara / g) dalam ekstrak etil asetat. PGPEa menunjukkan lebih aktiviti memerangkap pada 2,2-difenil-picrylhydrazyl (DPPH) dengan nilai IC50 302,43 ± 1.9μg/ml dan jumlah aktiviti antioksidan dengan IC50 294,35 ± 1.68 μg / ml. PGPEa juga menunjukkan dengan ketara effecton pengoksidaan lipid IC50 208,62 ± 1.68 μg / ml, dan juga mengurangkan dengan amat ketara.
Antara ekstrak pelarut yang telah diuji, ekstrak etil asetat daripada kulit buah-buahan menunjukkan spektrum luas aktiviti antimikrobial. Etil asetat ekstrak ditambah C.elegans cacing menunjukkan perencatan pengumpulan lipid sama dengan acarbose, menunjukkan aktiviti hipoglisemik yang baik.
Cacing biasa berbanding dengan ujian (ekstrak etil asetat ditambah) menunjukkan aktiviti hipoglisemia yang paling tinggi dengan meningkatkan jangka hayat cacing. analisis GC-MS daripada PGPEa menunjukkan jumlah maksimum alkohol 5-hydroxymethylfurfural dan 4-fluorobenzyl (48.59%).

Dalam penyiasatan ini kita mendapati pelbagai sifat-sifat biologi kulit buah delima. Keputusan jelas menunjukkan bahawa ekstrak kulit buah delima boleh digunakan untuk mencegah kejadian komplikasi jangka panjang pesakit kencing manis.


Ekstrak buah delima tidak dijual secara runcit di pasaran. Namun ianya ada terkandung dalam Jus Delima Bio Emas.

Artikel Penuh:


Chemical analysis of Punica granatum fruit peel and its in vitro and in vivo biological properties



The medical application of pomegranate fruits and its peel is attracted human beings. The aim of the present study was to evaluate the in vitro α-Glucosidase inhibition, antimicrobial, antioxidant property and in vivo anti-hyperglycemic activity of Punica granatum (pomegranate) fruit peel extract using Caenorhabditis elegans.


Various invitro antioxidant activity of fruit peel extracts was determined by standard protocol. Antibacterial and antifungal activities were determined using disc diffusion and microdilution method respectively. Anti-hyperglycemic activity of fruit peel was observed using fluorescence microscope for in vivo study.


The ethyl acetate extract of P. granatum fruit peel (PGPEa) showed α-Glucosidase inhibition upto 50 % at the concentration of IC50 285.21 ± 1.9 μg/ml compared to hexane and methanol extracts. The total phenolic content was highest (218.152 ± 1.73 mg of catechol equivalents/g) in ethyl acetate extract. PGPEa showed more scavenging activity on 2,2-diphenyl-picrylhydrazyl (DPPH) with IC50 value 302.43 ± 1.9 μg/ml and total antioxidant activity with IC50 294.35 ± 1.68 μg/ml. PGPEa also showed a significant effecton lipid peroxidation IC50 208.62 ± 1.68 μg/ml, as well as high reducing power. Among the solvents extracts tested, ethyl acetate extract of fruit peel showed broad spectrum of antimicrobial activity. Ethyl acetate extract supplemented C.elegans worms showed inhibition of lipid accumulation similar to acarbose indicating good hypoglycemic activity. The normal worms compared to test (ethyl acetate extract supplemented) showed the highest hypoglycaemic activity by increasing the lifespan of the worms. GC-MS analysis of PGPEa showed maximum amount of 5-hydroxymethylfurfural and 4-fluorobenzyl alcohol (48.59 %).


In the present investigation we observed various biological properties of pomegranate fruit peel. The results clearly indicated that pomegranate peel extract could be used in preventing the incidence of long term complication of diabetics.

Keywords: P. granatum, α-Glucosidase inhibition, Antioxidants activity, Antimicrobial activity, Caenorhabditis elegans, GC-MS analysis


Diabetes mellitus is generally characterized by hyperglycemia that leads to disturbances in the metabolism of carbohydrates, lipids and proteins [1]. Chronic inflammation leads to obesity and it may be prevented by avoiding sugar containing food items. Nowadays insulin therapy is encouraged for the prevention of diabetes mellitus, but the therapy has several side effects like insulin resistance [2], anorexia nervosa, brain atrophy etc. Recently, the use of medicinal plants in modern medicine has been increased in order to prevent or to cure diseases [36]. At present food safety is an important concern due to the presence of food borne and other clinical pathogens. The quest for new antimicrobials have been taken into account by researchers worldwide due to the emergence of antibiotic resistant organisms and toxicity of synthetic drugs. Herbal plants and their extracts have been investigated in last few years due to the toxicological concerns of synthetic drugs [7, 8]. The secondary metabolites obtained from medicinal plants have also been investigated for their radical scavenging property.

P. granatum Linn. (Pomegranate) is abundantly present in India and belongs to family Punicaceae. Pomegranate peel contains tannins, flavonoids, polyphenols and some anthocyanins such as cyanidins and delphinidins [9]. Extracts from the peels of pomegranate has been proposed to play vital role in various pharmacological activities [10, 11]. The natural antioxidant food supplement will give the anti- aging process of skin, cells, tissues and organs. Antioxidants are present in certain fruits and vegetables that can protect human cells from oxidative damage and prevent aging of cells and body [12]. It reduces the incidence of tumors and infections. The plant constitutes gallotannic acid and the alkaloid such as isopelletierine, pelletierine, methypelletierine, psuedopelletierine, gallic acid, tannic acie, sugar, cacium oxalate, etc. However, the phytochemical constituents of the plant and antimicrobial activity of this plant have been reported in literature [13, 14]. It is very important to explore the findings of the research by investigation it in vivo and understanding its interactive effect.

C. elegans is a model organism that can be grown cheaply and in large numbers on plates. The worm is preferred over other model organisms especially mouse because they have a short life cycle of only 2 weeks which reduces the experimental cycles and the behaviour of individual cells can be studied because of its transparent body. Additionally, C. elegans genome have functional counterparts in humans which makes it a convenient model for human diseases especially diabetes study.

The nematode Caenorhabditis elegans contains abundant fat droplets in intestinal and hypodermal tissue. Compared to droplets in mammalian adipose tissue, which can expand to sizes of 100 μm [15], C. elegans lipid droplets are small, typically in the size range of 1–1.5 μm [16]. C. elegans has a multistep developmental process due to multicellularilty property. Regulation of lipid droplets inside the nematode using potential herbal extracts will yield key insights into the understanding of obesity, diabetes, and other metabolic diseases [17, 18]. From thios point of view, the present study was evaluated to determine antioxidant activity, α-Glucosidase activity, antimicrobial and antidiabetic property of pomegranate fruit peel extracts.


Collection of plant

The Healthy fresh pomegranate peel was collected Irula Tribe Women’s Welfare Society (ITWWS), Chengalpet, Tamil Nadu, India. The taxonomical identification of the plants was confirmed by Dr. Jeyajothi, botanist from Loyola College, Chennai, India. The plant was deposited under the vocher number LCH-74 in Loyola College, Chennai.

Plant material and extraction

Peels of P. granatum (pomegranate) were shade dried and subsequently powdered. Five hundred grams of powdered peel was soaked in three different solvents (Hexane, ethyl acetate and methanol) at room temperature for 72 h in rotatory shaker (120 rpm). The powder and solvent were taken in the ratio of 1:3. The filtrates were further concentrated under reduced pressure at 40 °C and stored in a refrigerator at 2–8 °C for use in subsequent experiments.

α-Glucosidase inhibition of solvent extracts

To analyse the α-Glucosidase inhibition, standard methodology was followed with some modifications [19, 20].

Total phenolic content (TPC)

To analyse the total level of phenolic components, Folin–Ciocalteau method was followed with some modifications [20].

DPPH radical scavenging assay of P. granatum fruit peel

DPPH quenching ability of P. granatum fruit peel hexane ether, ethyl acetate and methanol extracts was measured according to Hanato et al. [21].

Evaluation total antioxidant activity of P. granatum fruit peel

The total antioxidant activity of P. granatum fruit peel was determined according to the method of [22].

Lipid peroxidation assay

The evaluated the lipid peroxide properties of the extracts thiobarbituric acid method was followed [20].

Reducing power activity of P. granatum fruit peel

The invitro reducing power activies of the different concnetrations of the plant extract were evaluated by following the standard methodology [3].

Assessment of antimicrobial activity of P. granatum fruit peel

Test organisms

The following bacterial cultures were used to perform antibacterial test using MTCC and ATCC cultures: Escherichia coli MTCC 441, Klebsiella pneumonia ATCC 1705, Streptomyces diastaticus MTCC 1394 and Enterococcus faecalis MTCC 439.

Clinical isolates: Enterobacter aerogenes, Klebsiella pneumoniae, Enterococcus faecalis, Staphylococcus epidermidis, Mycobacterium smegmatis and Escherichia coli and other fungal strains.

Disc diffusion method

The inhibition activity of the extracts against various pathogenic bacteria were determined by folling the standard methodology [3]. Plates were incubated overnight at 37 °C and then the zone of inhibition was measured in mm. All experiments were repeated in triplicate.

Antifungal assays using broth micro dilution method

Antifungal activity was performed according to the standard reference method [23]. The antifungal agent, fluconazole was used as positive control and DMSO was used as negative control.

C. elegans strains and culture conditions

The Bristol N2 (wild-type) C. elegans strain was used in this study and was obtained from Department of Genetic engineering, Madurai Kamaraj University, Tamil Nadu. It was maintained at 20 °C on nematode growth medium (NGM) agar plates. Plates were supplemented with Escherichia coli OP50 as nematode feed.

Fluorescence microscope analysis for lipid accumulation in C.elegans

All worms used in this study were age-synchronized and the experimental animals were grown in liquid M9 medium and raised from eggs obtained by sodium hypochlorite treatment. The extracts of pomegranate fruit peel were made in three different concentrations (100 μg, 300 μg, and 500 μg/mL). They were added to dead OP50 (which were killed by autoclaving) in separate vials. They were then inoculated onto the NGM plates. Twenty worms were inoculated in each plate. Wild-type C. elegans were kept for 5 days under various glucose concentrations in the agar prepared as described above, harvested, and washed. Then drop of Nile Red (0.05 μg/mL) solution were added to the worms, which were then incubated for 30 min, washed with 25 % ethanol twice, and photographed in a Fluorescence microscope (Carl Zeiss Axioplan 2).

Determination of triglycerides

Measurement of tryclycerides is used in screening of the lipid status of the worms. In vitro study was performed using ROBIniK Pritest Triglycerides assay kit using the treated C. elegans worms.

Determination of life span

Synchronized worms were used for life span assay [24]. Twenty number of L4 worms were inoculated in5-fluorodeoxyuridine (FUDR40 mM) plate. The worms were grown at desired temperature (25 °C). The worms were scored every day to find out the activity of the plant extracts on them. The unmoved animals were considered as dead.

GC –MS analysis

The individual compounds present in the extract was determined by GC-MS. The standard operating conditions were followed by the reported literature for GC-MS [3].

Statistical analysis

All the results were analysed in Microsoft Excel 2007.

Results and discussion

Medicinal plants and their extracts have exploited continuously by researchers in order to produce potential drugs of medicinal properties with reduced toxicity. In the line of this, we reported significant in vitro α-glucosidase inhibition activity of ethyl acetate extract of pomegranate peel. The α-glucosidase inhibiting potential of solvent extract such as hexane, ethyl acetate and methanol extracts from the fruit peel were tested and the results are summarized in Table 1. Ethyl acetate extract inhibited alpha glucosidase with the maximum value of 75.6 ± 2.03 % at 500 μg/ml with IC50 value of 285 ± 1.98 μg/ml. Alpha glucosidase inhibiting activity of fruit peel extracts are in the order of ethyl acetate > hexane > methanol.

Table 1

α-Glucosidase inhibition of extracts of Punica granatum (Pomegranate) fruit peal

Pomegranate fruit peel extract potently scavenged DPPH radicals similar to catechin, it is likely that peel extract possessed proton-donating ability and in association with a number of hydroxyl groups to stabilize free radicals [25, 26]. The results of this study suggest that the extracts contain phytochemical constituents that are capable of donating hydrogen to a free radical. Ethyl acetate extract of pomegranate peel has the ability to reduce the stable radical DPPH to diphenylpicryl hydrazine. The different concentrations of solvent extract of pomegranate peel showed antioxidant activities in a concentration-dependent manner (26–71.2 %) in the DPPH scavenging assay. Ethyl acetate extract (100–500 μg/ml) showed the highest activity (30.5–71.2 %). Figure 1 shows the scavenging effects of various extracts of pomegranate fruit peel on DPPH˙ in the following order: ethyl acetate > methanol > hexane.

Fig. 1

DPPH scavenging effect of hexane, ethyl acetate, and methanol extracts of Punica granatum (Pomegranate) fruit peel extracts and Vitamin C at different concentrations (100–500 μg/ml). Each value represents the mean ± standard

The total antioxidant capacity of various solvent extracts of pomegranate fruit peel at different concentrations (100–500 μg/ml) was found to be in the following order: ethyl acetate > methanol > hexane (Figs. 2, ,33 and and4).4). Ethyl acetate extract (500 μg/ml) showed the highest total antioxidant activity (69.5 %).

Fig. 2

Total antioxidant activity of hexane, ethyl acetate, and methanol extracts of Punica granatum (Pomegranate) fruit peel extracts and Vitamin C at different concentrations (100–500 μg/ml). Each value represents the mean ± standard

Fig. 3

Reducing power of hexane, ethyl acetate, methanol extracts of Punica granatum (Pomegranate) fruit peel extractsand BHT at different concentrations (100–500 μg/ml). Each value represents the mean ± standard

Fig. 4

Lipid peroxidation scavenging effect of hexane, ethyl acetate, methanol extracts of Punica granatum (Pomegranate) fruit peel extracts and BHT at different concentrations (100–500 μg/ml). Each value represents the mean ± standard

The antibacterial activity of P. granatum fruit peel may be because of the presence of metabolic toxins or broad spectrum antimicrobial compounds that act against both Gram + ve and Gram –ve bacteria. The results of antibacterial activity of ethyl acetate extract of P. granatum (Pomegranate) fruit peel (PGPEa) against various human pathogens are listed in the Table 2. The MIC was significantly lower in ethyl acetate extracts that inhibits T. rubrum and T. mentagrophytes (31.25 μg/ml) (Table 3).

Table 2

Antibacterial activities of crude extracts of Punica granatum (Pomegranate) fruit peel

Table 3

Antifungal activities of crude extracts of Punica granatum (Pomegranate) fruit peel

Various investigations were carried out to determine antioxidant, anticarcinogenic, and anti-inflammatory properties of pomegranate constituents [2729]. Hajoori et al. [30] evaluated the antibacterial activity of different solvent extracts of P. granatum peel against human pathogens including four gram positive bacteria and six gram negative bacteria. According to Rathi et al. [31] P. granatum fruit peel can be used as an easily accessible source of natural antioxidant. They clearly demonstrated broad spectrum antimicrobial activity of pomegranate against bacteria. Additionally they mentioned that the presence of phytocompounds in the extracts including phenols, tannins and flavonoids as major active constituents may be responsible for these activities. Thus, the present study provides a strong direction for proper investigation of pomegranate fruit peel to explore molecules having antimicrobial properties against human pathogens. The presence of active inhibitors in pomegranate fruit peels including phenolics and flavonoids were revealed by phytochemical analysis as potent constituents.

The observed lifespan of C. elegansas model organism (control) was about 17 ± 1 days and the normal worms about 25 ± 1 days sillar to the other reported study [32]. When the observed result of the control was compared with that of the tests, we found that the ethyl acetate extract of P. granatum fruit peel showed the increased lifespan of the worms than that of the control i.e., about 24 ± 1 days. The second highest activity was shown for methanol extract of P. granatum (Table (Table44).

Table 4

C. elegans Life span assay (Plate contain Glucose) of Punica granatum fruit peel

C. elegans provides a reliable tool to understand the changes in lipid accumulation in the body by glucose concentrations that are within the range observed in poorly controlled diabetic patients [33]. In the present study ethyl acetate extract of pomegranate fruit peel has the ability to reduce the lipid accumulation in the worm body. The fluorescence microscopic analysis clearly shows that ethyl acetate peel extract treated worms have accumulated less lipid compared to the normal worms (Figs. 5 and and6).6). Reduction in glucose level and lipid content in C.elegans indicates that ethyl acetate extract of pomegranate fruit peel has potential antidiabetic compounds which need to be isolated and identified through chromatographic techniques. Undoubtly ethyl acetate extracts of the test plant showed the presence of diverse molecules when subjected to GC-MS. In PGPEa a total of 48 compounds were detected, out ofwhich the maximum area was found for 5-hydroxymethylfurfural and 4-fluorobenzyl alcohol (Table 5) with a value of 48.59 % (Fig. (Fig.77).

Fig. 5

Lipid accumulation test in C. elegans under fluorescence microscope (Nile Red staining) – a Shows normal C. elegans, b Shows lipid accumulation in C. elegans in the presence of glucose solution, c Shows lipid accumulation in C. elegans in presence

Fig. 6

Lipid Quantification in C. elegans using Triglyceride assay for Punica granatum (Pomegranate) fruit peel extracts

Fig 7

GC – MS Chromatogram of Ethyl acetate extracts of Punica granatum fruit peel extracts. 5-hydroxymethylfurfural and 4-fluorobenzyl alcohol metabolites were found to be most biologically active components (based upon the retention time) present

Table 5

Phytocomponents identified in the ethyl acetate extracts of Punica granatum fruit peel (PGPEa) (GC-MS Study)


It is concluded that the ethyl acetate extract of pomegranate fruit peel contained considerable levels of phenols and flavonoids which are responsible for α-glucosidase inhibition and antioxidant activities. These in vitro assays also indicate that the PGPEa not only has potential antidiabetic and natural antioxidant compounds but also has the ability to increases the life span of C. elegans. Future studies are required to prove whether the process described in C. elegans can be translated to the situation in diabetic patients. 5-hydroxymethylfurfural and 4-fluorobenzyl alcohol compounds detetcted in GCMS might plaied the role in antioxidant and antimicrobial potentials of the extracts.


GC-MS, gas chromatography–mass spectrometry


We would like to thank Department of Biotechnology, India (Indo-Spain Collaborative project, Ref. No. – BT/IN/Spain/19/PA/2013) for financial assistance. This study was supported by grants from the Cooperative Research Program for Agriculture Science & Technology Development (Project No. PJ0102212014), Rural Development Administration, Korea. The authors extend their sincere appreciation to the Deanship of Scientific Research at King Saud University for its funding this Prolific Research Group (PRG-1437-28).

Availability of data and materials

All data and materials were given in the manuscript. We have further data and materials.

Authors’ contributions

KBK, BV and AK carried out the experimental part of the manuscript. KBK, NAA-D, BV, AK and MVA analyzed the antimicrobial, antioxidant and in vivo studies. KBK, MVA, HSC, and PA participated in its design and coordination and helped to draft the manuscript. HSC, YOC and PA involved in analyzing and monitoring the data and experiment. All authors read and approved the final manuscript.

Competing interests

The authors declare that they have no competing interests.

Consent for publication

Not applicable.

Ethics approval and consent to participate

Not applicable.

Financial disclosure

India (Indo-Spain Collaborative project, Ref. No. – BT/IN/Spain/19/PA/2013); South Korea (Project No. PJ0102212014), Saudi Arabia (PRG-1437-28).

Contributor Information

Mariadhas Valan Arasu, moc.liamg@usaranalavm.

Han Sung Choi, ten.liamnah@8473gsh.

Young Ock Kim, rk.aerok@8219oyk, moc.liamg@8219oyk.


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