Abstract: The optimal modification condition of wheat bran was optimized by single factor test and response surface method. The effects of ultra-high pressure, processing time, ratio of solid to liquid on the response of the holding water capacity(WHC), swelling capacity(SC), soluble dietary fiber content(SDF%) of wheat bran were studied. The regression equations of WHC, SC and SDF% were built by response surface analysis method. The optimum process parameters were obtained as follows： the ultra\|high pressure was 400 Mpa, processing time was 20 min, ratio of solid to liquid was 18:100, and the response values were 3.08 g·g-1, 1.49 v·g-1, 3.12%, respectively.

Key words: wheat bran, ultra-high pressure, modification, response surface analysis method