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ARS Home » Pacific West Area » Albany, California » Western Regional Research Center » Healthy Processed Foods Research » Research » Publications at this Location » Publication #324011

Research Project: Adding Value to Plant-Based Waste Materials through Development of Novel, Healthy Ingredients and Functional Foods

Location: Healthy Processed Foods Research

Title: Structural and physico-chemical properties of insoluble rice bran fiber: effect of acid–base induced modifications

item QI, JING - Jiangnan University
item Yokoyama, Wallace - Wally
item MASAMBA, KINGSLEY - Jiangnan University
item MAJEED, HAMID - Jiangnan University
item ZHONG, FANG - Jiangnan University
item LI, YUE - Jiangnan University

Submitted to: RSC Advances
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/10/2015
Publication Date: 9/10/2015
Citation: Qi, J., Yokoyama, W.H., Masamba, K.G., Majeed, H., Zhong, F., Li, Y. 2015. Structural and physico-chemical properties of insoluble rice bran fiber: effect of acid–base induced modifications. RSC Advances. 5:79915-79923.

Interpretive Summary: Bran is an abundant byproduct of cereal milling. Insoluble dietary fibers are the major component of cereal brans. This research shows that simple and inexpensive acid treatments can produce a polysaccharide fiber material. Different levels of acid can produce different compositions and physical properties.

Technical Abstract: The structural modifications of insoluble rice bran fiber (IRBF) by sequential regimes of sulphuric acid (H2SO4) and their effects on the physicochemical attributes were studied. The increment of H2SO4 concentration resulted in decreased water holding capacity that ultimately enhanced the oil binding capacity due to the partial removal of starch, protein and hemicelluloses. The starch and hemicelluloses were hydrolyzed exponentially by sequential increments of H2SO4 while protein was mainly dissolved by KOH for all samples. Moreover, higher H2SO4 concentration improved the porosity and crystallinity that led to higher thermal stability of the fiber as evident from XRD and TGA analysis. Furthermore, decreased monosaccharide linkages and increases of porosity with H2SO4 regimes were confirmed by FT-IR and SEM. The change in composition and microstructure of insoluble rice bran fiber (IRBF) induced significant physicochemical changes that might be suitable for their application in the food industry as an anti-diabetic and cholesterol lowering functional ingredient.