HPLC-FRAP methodology and biological activities of different stem bark extracts of Cajanus cajan (L.) Millsp
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2021Author
Sinan, Kouadio IbrahimeMahomoodally, Mohamad Fawzi
Eyüpoğlu, Ozan Emre
Etienne, Ouattara Katinan
Sadeer, Nabeelah Bibi
Ak, Güneş
Behl, Tapan
Zengin, Gökhan
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Sinan, K. I., Mahomoodally, M. F., Eyüpoğlu, O. E., Etienne, O. K., Sadeer, N. B., Ak, G. ... Zengin, G. (2021). HPLC-FRAP methodology and biological activities of different stem bark extracts of Cajanus cajan (L.) Millsp. Journal of Pharmaceutical and Biomedical Analysis. Journal of Pharmaceutical and Biomedical Analysis, 192. https://dx.doi.org/10.1016/j.jpba.2020.113678Abstract
Cajanus cajan. (L.) Millsp. (C. cajan) (Family: Fabaceae) also known as pigeon pea, is a famous food and cover/forage crop bearing a high amount of key amino acids (methionine, lysine and tryptophan). This study investigated into the total phenolic (TPC), flavonoid content (TFC), antioxidant ]2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2 -azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), ferric reducing antioxidant power (FRAP), cupric reducing antioxidant capacity, total antioxidant capacity (TAC) (phosphomolybdenum) and metal chelating] activities and enzyme [alpha-amylase, alpha-glucosidase, tyrosinase, acetyl-(AChE), butyry1-(BChE) cholinesterase] inhibitory effects of four extracts (methanol, hexane, ethyl acetate, aqueous) prepared from C. cajan stem bark. Direct identification of antioxidants was also conducted using the high performance liquid chromatography-ferric reducing antioxidant power (HPLC-FRAP) system. The highest TPC and TFC were recorded with the methanolic (23.22 +/- 0.17 mg GAE/g) and ethyl acetate extracts (19.43 +/- 0.24 mg RE/g), respectively. The methanolic extract exhibited important antioxidant activity with DPPH (38.41 +/- 0.05 mg Trolox equivalent (TE)/g), ABTS (70.49 +/- 3.62 mg TE/g), CUPRAC (81.86 +/- 2.40 mg TE/g), FRAP (42.96 +/- 0.59 mg TE/g) and metal chelating (17.00 +/- 1.26 mg ethylenediaminetetraacetic acid equivalent/g). p-coumaric and caffeic acid were the predominant antioxidants in the samples. Results from enzymatic assays showed the potential abilities of hexane extract in inhibiting the AChE, BChE, alpha-amylase and alpha-glucosidase enzymes. From the results obtained in this study, it can be concluded that C. cajan can be considered as a promising source of antioxidants and key enzyme inhibitors that can be exploited for future bioproduct development.