Characterization of Structure and Antioxidant Activity of Polysaccharides From Sesame Seed Hull
Run‐Yang Zhang, Jing-Hao Gao, Yilin Shi, Yifei Lan, Hua‐Min Liu, Wen‐Xue Zhu, Xue‐De Wang
Abstract
Sesame seed hull is the major by-product of sesame seed processing and is rich in polysaccharides. In this work, sesame hull polysaccharides (SHP) were extracted by ultrasound-assisted alkali extraction methods with a yield of 6.49%. Three purified polysaccharide fractions were obtained after decolorization, deproteinization, and column chromatography. Then, their main composition and antioxidant activity were investigated. The dominant fraction was SHP-2 with a yield of 3.78%. It was composed of galacturonic acid (51.3%), glucuronic acid (13.8%), rhamnose (8.9%), glucose (8.4%), and others. The linkage types of SHP-2 have the α- D -Gal p A-(1,4)-linked, α- D -Glc p A-(1,2)-linked, β-T- D- Rha p -linked, β- D- Glc p -(1,6)-linked, β-T- D- Gal p -linked, α- L -Xyl p -(1,4)-linked, α- L- Ara f -(1,3,5)-linked, and β- D- Man p -(1,4)-linked. This study might provide some useful basic data for developing applications for sesame seed hull polysaccharides in the food and pharmaceutical industries.