Subcritical water extraction of polyphenolic compounds from sorghum (Sorghum bicolor L.) bran and their biological activities

Food Chemistry
Xiaoping LuoYuqing Duan

Abstract

Subcritical water extraction (SWE), an environment-friendly technique, was applied to extract polyphenolics from sorghum bran. Extraction temperatures (°C), time (min), and solid-liquid ratio (mL/g) were investigated and optimized by Box-Behnken design. The optimized conditions for SWE was 144.5 °C of temperature, 21 min of time, and 35 mL/g of solid-liquid ratio, with a polyphenolics yield of 47.253 ± 0.375 mg GAE/g dw, which was in good agree with the predicted value. Comparing with hot water extraction (HWE), SWE resulted in a higher yield of polyphenolics, higher radical scavenging activities, and more efficient antiproliferative activity. Furthermore, major polyphenolic compositions of the extracts were identified and quantified by HPLC-ESI-MS/MS. Taxifolin, taxifolin hexoside, oligomeric procyanidins, and epicatechin were the most abundant polyphenolic compounds in the extracts. Taken together, SWE can be used as a effective extraction method for polyphenolics from sorghum bran, which could be used as a potential source of natural antioxidants.

Citations

Sep 22, 2020·Critical Reviews in Analytical Chemistry·Sing Chuong ChuoAbdullah Alarifi
Dec 8, 2020·Critical Reviews in Food Science and Nutrition·Pilar Espitia-HernándezLeonardo Sepúlveda
Jul 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Na ZhengXianhao Cheng
Jul 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Bimal-Kumar GhimireIll-Min Chung
Jul 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yan ChengYu Yang

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