Anti-obesity potential of corn silks: Relationships of phytochemicals and antioxidation, anti-pre-adipocyte proliferation, anti-adipogenesis, and lipolysis induction

The 50% ethanolic corn silk extracts (CSEs) derived from sweet (SP and SV) and waxy corn silk (KJ and KT) cultivars were investigated for their phytochemical compositions using HPLC-UV method, antioxidation using FRAP and DPPH assays and anti-obesity potential in 3T3-L1 adipocyte. Different major compositions among CSEs were manifested: flavonoids as quercetin glucoside derivatives and phenolics as ferulic acid in sweet CSEs, and phenolics as p-coumaric acid and derivatives of gallic acid in waxy CSEs. Related to high phytochemical contents, the antioxidant activity, anti-pre-adipocyte proliferation, anti-adipogenesis, and lipolysis induction in sweet CSEs were higher than in waxy CSEs. Moreover, significant correlations between phytochemical contents and anti-proliferation and anti-adipocyte differentiation were indicated in sweet CSEs. Interestingly, lipolysis induction was detected in both sweet and waxy CSEs. Conclusively, the anti-obesity potential of CSEs involving anti-adipogenesis and lipolysis induction is manifested in association with the composition of flavonoids and phenolics as the functional ingredient. (C) 2016 Elsevier Ltd. All rights reserved.