Physicochemical Property and Antioxidant Activity of Corn Fiber Gum
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Abstract:
Two kinds of corn fiber gum fractions, named CFG1 and CFG2, were extracted from de-oiled and de-starched corn fiber by the alkaline hydrogen peroxide method, and thephysicochemical property, emulsifying capacity and antioxidant activity of CFG1 and CFG2 were investigated. The yields of CFG1 and CFG2 were 16.3 and 5.7%, respectively (based on the dry weight of corn bran). CFG1 and CFG2 showed good thermal stability at 220 ℃ and CFG2 exhibited a higher apparent viscosity. The thermodynamics analysis indicated that both CFG1 and CFG2 had stronger emulsifying activity index and emulsification stability index, and the stable emulsion of CFG2 exhibited higher viscosity. . The antioxidant activity analysis showed that CFG1 and CFG2 had significant DPPH radical scavenging activity and oxygen radical absorption capacity (ORAC) in a dose-dependent manner. The scavenging rates of CFG1 and CFG2 were 71.8 and 83.1%, respectively, at the concentration of 6.0 mg/mL. In addition, the ORAC values of CFG1 and CFG2 were 69 and 120 μmol TE/g, respectively, indicating that CFG2 had stronger antioxidant activity. The DPPH and ORAC results of CFG suggested that CFG (especially for CFG2) could be developed as a natural emulsifying agents with favorable antioxidant activity.
