Study On Hydrolysis And Derivatizayion Of Peach Gum

Natural hydrophilic colloid-plant gum plays an important role, such as in food,pharmaceuticals, cosmetics, construction and other fields. In this paper, peach gum wetalked about is one kind of natural gum. Studies had shown that the refined peach gumwas similar with Arabic gum polysaccharide in composition. After specific treatment,the emulsifying capacity and stableility of peach gum were better than Arabic gumand guar gum. Therefore, active research should be conducted on the peach gum. Inorder to develop the use of our abundant peach gum can reduce imports of Arabicgum, guar gum and other gums.Peach gum as experiment raw materials was collected from Nanjing local. Themain research contents and results were as follows:(1) the experiment to determineand optimize the process conditions of peach gum hydrolysis had been conducted,which results were as follows:1. the relationship of primary and secondary effectfactor of peach gum hydrolysis was pH> microwave time> microwave power>solid-liquid ratio.2. The optimize process conditions of peach gum hydrolysis hadbeen found by conducting L9(3~4) orthogonal test, which results were as follows:When the microwave time is3h, microwave power of0.3kW, pH12, solid-liquidratio of1/30the peach gum solution had the highest intrinsic viscosity, which was7.42mL/g;(2) The physical and chemical properties of peach gum had beendetermined, which result were as follows:1. greater particle size of the original peachgum power has faster water absorbing rate and shorter time of water absorption toreach saturation.2. The solution of peach gum polysaccharide after hydrolysis, whichspecific rotation was determined for the L, then we infer that there were moresubstance showed rotation for the L after hydrolysis.3. Molecular weight of peachgum had been determined under the experimental conditions. The range of molecularweight of peach gum polysaccharide solution was between the1.16×10~4~4.29×10~5g/mol;4. The IC50of peach gum polysaccharide on the DPPH radical was44.20. Thescavenging rate on DPPH free radical was gradually reduced with the peach gumpolysaccharide solution concentration decreases;(3) The experiment to determine andoptimize the process conditions of decolorizing peach gum solution had beenconducted, which results were as follows:1. Activated carbon and anion exchangeresin had the effects of decolorization on the peach gum solution. And thedecolorization rate of anion exchange resin was higher than activated carbon.2The relationship of decolorization rate was: anion exchange resin-carbon> carbon-anionexchange resin> anion exchange resin> activated carbon. Thus we chose anionexchange resins as the final bleaching agent.3. The relationship of primary andsecondary effect factor of peach gum polysaccharide solution bleaching was:bleaching time> dosage of bleaching agent> temperature> pH. the optimal processconditions of Peach gum polysaccharide solution is: bleaching time was100min,dosage of bleaching agent is1.0g, pH5, temperature50℃;(4) The experiment todetermine and optimize the process conditions of peach gum phosphate, which resultwere as follows:1. After comparison, we can acquire a high substitute degree ofphosphorylation peach gum products,when the mixture of phosphate was used forphosphate agent.2.Urea can catalyze phosphate reaction of peach gum, to some extent,it can improve the substitution degree of products.3. The relationship between theprimary and secondary effects was: microwave power> phosphorylation dosage>Microwave time> solid-liquid ratio.4. The optimum process of Peach gum phosphatewas microwave power of0.3kW, the amount of15%phosphate-based agent,microwave time of60min, solid-liquid ratio of1/20.