The Research On The Technics Conditions And Its Physicochemical Properties Of Dietary Fiber From The Dregs Of Phyllostachys Praecox

Phyllostachys praecox is one of the fine species bamboo shoots for application in China, with the early bamboo shoot, high yield, high efficiency, high nutritional and commodity value and so on. When the bamboo shoots are processed as drinks, there will produce a large amount of waste, while the dregs of shoots is an ideal raw material of dietary fiber.This paper was based on the dregs of shoots after extracting juice as the raw material to produce dietary fiber by the method of chemical and microbial fermentation, using the single factor and orthogonal experiment to optimize the preparing process. Then study on the performance comparison for the individual dietary fiber products. Aiming to increase the economic benefits of Phyllostachys praecox, improve the add value of products, provide the theoretical basis for the further study on the Phyllostachys praecox and dietary fiber, it has profound significance on social, economic and academic.With the method of alkali and acid for extracting dietary fiber, we obtained the best processing conditions:the function of alkali:pH was12, ratio of liquid to material was15:1, temperature was50℃, time was100min; the function of acid:pH was2, ratio of liquid to material was10:1, temperature was50℃, time was100min. Under the condition the yield of dietary fiber was72.5%.In the experiment of the dietary fiber fading with hydrogen peroxide, the best process parameters for fading were:pH was9, the concentration of hydrogen peroxide was5%, temperature was80℃, time was3.5h. Under the optimum process conditions, we can make the relative whiteness value of bamboo shoots dietary fiber to48.35.Using the method of fermentation with Trichoderma viride for extracting dietary fiber, the best optimal conditions were:the liquid material ratio of fermentation was10:1, time was60h, quality of Trichoderma viride was6%, temperature was32℃, pH was5.8, Under the condition the yield of dietary fiber was79.33%.Using the method of mixed fermentation with Lactobacillus delbruechii subsp.bulgaricus and Streptococcus thermophilus for extracting dietary fiber, the best optimal conditions were:quality was4%, temperature was40℃, time was24h, the liquid material ratio of fermentation was7.5:1. Under the condition the yield of dietary fiber was80.20%.After the processing from the dregs of Phyllostachys praecox to dietary fiber, both the quality of products and its performance were improved obviously, no matter with the method of chemical or microbial fermentation. In terms of quality:the content of starch and protein were decreased, while the content of dietary fiber were improved significantly; For the performance:compared with the raw material, the hydration properties, cation exchange capacity and adsorption ability(for fat, cholesterol and NO2-)of the dietary fiber sample were improved significantly. The methods:Compared with chemical method of dietary fiber, the dietary fiber of fermentation and its all performance were improved significantly except the capability of fat. In the properties of products with fermentation using trichoderma viride only and lactic acid bacteria mixed, in terms of hydration properties and adsorption capacity of fat, lactic acid bacteria won, while in the cation exchange capacity, absorption of cholesterol and NO2-, trichoderma viride had a better effect. The fading can reduce the hydration properties and cation exchange capacity of the chemical fiber, but it can improve the performance of adsorption to a certain extent.