Effect of Extrusion on the Hydrophilic Antioxidant Capacity of Four Whole Grains

Lingxiao Yang¹, Hui Zhang^1, , Lilin Cheng¹, Zhonghua Gu¹, Dan Hua¹, Xiguang Qi¹, Haifeng Qian¹ and Li Wang¹

¹State Key Laboratory of Food Science and Technology & School of Food Science and Technology, Jiangnan University, Wuxi, China

Cite this paper:
Lingxiao Yang, Hui Zhang, Lilin Cheng, Zhonghua Gu, Dan Hua, Xiguang Qi, Haifeng Qian and Li Wang. Effect of Extrusion on the Hydrophilic Antioxidant Capacity of Four Whole Grains. Journal of Food and Nutrition Research. 2014; 2(2):80-87. doi: 10.12691/jfnr-2-2-4

Abstract

Cereal grains are generally subjected to thermal treatment before consumption. However, few data are available on total phenolic content (TPC), degree of starch gelatinization, phenolic acids, and antioxidant capacity of extruded whole grains based on trolox equivalent antioxidant capacity (TEAC), DPPH radical scavenging activity, and ferric reducing antioxidant potential (FRAP). Four whole grains, brown rice, wheat, maize, and barley were examined in this study. The free and bound TPCchanged significantly (p < 0.05) after extrusion. Morever, heat and degree of starch gelatinization could affect the bound TPC. In bound fraction, the antioxidant capacity was directly influenced by TPC. Extrusion (110-140°C) can retain or improve the antioxidant capacity in its free and bound fractions. Phenolic acids are stable in their bound form. Results showed that the bound TPC and total phenolic acids have a strong relationship against antioxidant capacity, indicating that TPC is the major antioxidant in the bound fraction.

Keywords:
whole grains total phenolic content antioxidant capacity HPLC

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