Effects of oxidative modification by peroxyl radicals derived from oxidative thermal decomposition of 2,2'-azobis(2-amidinopropane) (AAPH) at different concentrations on the structural and functional properties of rice bran protein were investigated. The results indicated that as AAPH concentration increased, protein carbonyl, disulfide, and dityrosine contents of rice bran protein increased from 2.0 nmol/mg, 12.04 nmol/mg, and 84.54 to 7.09 nmol/mg, 14.69 nmol/mg, and 127.1, respectively, while free sulfhydryl content decreased from 23.97 to 1...