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Background  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 .    Methods  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.    Results  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 %).    Conclusion  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.

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