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Chemistry and Industry of Forest Products ›› 2020, Vol. 40 ›› Issue (6): 1-7.doi: 10.3969/j.issn.0253-2417.2020.06.001

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Effect of Baking Temperature on Preparation and Properties of Gleditsia sinensis Polysaccharide Gum

Jianxin JIANG(), Liwei ZHU, Wei ZHANG, Xianping LI   

  1. College of Materials Science and Technology, Beijing Forestry University, Engineering Research Center of Forestry Biomass Materials and Energy, Beijing 100083, China
  • Received:2020-09-07 Online:2020-12-28 Published:2020-12-29

Abstract:

Polysaccharides PG1, PG2, PG3 and PG4 were prepared from circular Gleditsia sinensis seeds by baking at 145, 155, 165, and 175 ℃, respectively. The effects of pretreatment temperature on the extraction rate, yield of galactomannan(GM), chemical composition of polysaccharides gum, molecular weight and monosaccharide composition of GM, rheological properties and gel properties of polysaccharides gum were studied. The results showed that the process of baking pretreatment for the separation of G. sinensis polysaccharide gum was simple and efficient. The obtained endosperm shape was relatively complete and the extraction rate of endosperm was higher. The impurity content, extraction rate of G. sinensis endosperm and yield of GM decreased with the increase of baking temperature. The extraction rate of endosperm and GM from G. sinensis endosperm reached 92.7% and 38.5%, respectively, after pretreated at 165 ℃ for 4 min. The ratio of mannose to galactose in G. sinensis GM increased with the increase of baking temperature, and too high baking temperature would lead to the degradation of unstable side chain galactose, decrease of molecular weight and increase of polydispersity index. And the synergetic interaction between G. sinensis polysaccharide gum and xanthan gum was significantly enhanced, and the gel strength increased from 21.5 g to 23.2 g from 145 ℃ to 175 ℃. The apparent viscosity of G. sinensis polysaccharide gum decreased with the increase of shear rate, and the flow index(n) values of 0.5% G. sinensis polysaccharide gum were 0.77-0.83. The viscosities of jelly formed by the interaction between G. sinensis polysaccharide gum and boron ions were 69 000-87 000 mPa·s, which exceeded the standard for the use of fracturing fluid thickeners in oil fields(30 000 mPa·s).

Key words: circular Gleditsia sinensis, polysaccharide gum, baking temperature, preparation, properties

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