Abstract: In this study,the protein in tartary buckwheat bran was extracted for Osborne fractions.Meanwhile,the free radical scavenging functions of different proteins from tartary buckwheat bran were also investigated.The results showed that the content of different proteins in tartary buckwheat bran are albumin 51.22%,globulin 13.69%,glutelin 17.07%,and prolamin 8.83%,respectively.Both protein complex and four protein components from tartary buckwheat bran can scavenge free radical in vitro.The ratios of water-soluble albumin and globulin scavenging free radial are higher than those of prolamin and glutelin.The functions of these proteins scavenging free radical increased with their concentrations increasing in lower range,but trend to constant when these proteins reach higher concentration,suggesting that the functions have no relationship with protein in higher concentration range.

Key words: tartary buckwheat bran, protein complex, Osborne fraction, free radicals