Abstract:The composite enzymatic （cellulase and xylanase） hydrolysis conditions of bamboo shoot powder were optimized based on the soluble dietary fiber content. The enzymatic hydrolysis conditions were optimized as follows：a solid-to-liquid ratio of 1∶10 （g/mL），a composite enzyme addition amount of 0.4% （a cellulase-toxylanase mass ratio of 2∶1），and enzymatic hydrolysis at 50 ℃ and pH4.6 for 90 min. Under these conditions，the yield of soluble dietary fiber reached 13.94%. Scanning electron microscopy and X-ray diffraction results revealed that the enzymatic hydrolysis resulted in a more loose and porous structure of bamboo shoots，accompanied by a decrease in crystallinity. Furthermore，the functional properties of bamboo shoot dietary fiber were significantly improved，as evidenced by the enhanced water-holding capacity，expansion capacity，oil-holding capacity，and DPPH free radical scavenging ability. These findings demonstrated that composite enzymatic hydrolysis effectively enhanced the functional properties of bamboo shoot dietary fiber.