Post extraction production technology of pullulanose

Abstract

A post-extracting process for pullulanose features that after the bacteria have been removed, the fermented liquid of pullulanose is decolored, desalted and concentrated by membrane filtering technique, and then directly dried by fluidized-bed drier. Its advantage is high extraction rate.

Description

technical field [0001] The invention relates to the industrialized production technology of pullulan, in particular to a post-extraction production technology of pullulan. Background technique [0002] Pullulan is a microbial exopolysaccharide with high application value. It is a linear polysaccharide formed by polymerizing maltotriose repeating units linked by α-1,4-glycosidic bonds through α-1,6-glycosidic bonds. . However, due to the different strains used, the maltotriose unit in the polysaccharide chain is occasionally replaced by a very small amount of maltotetraose, maltose or glucose residues, and branched chain structures also appear in individual cases. The molecular weight of pullulan is generally 5.0×10 4 -5.0×10 6 Between daltons; its molecular weight is greatly affected by the culture conditions. Controlling the fermentation conditions can fix its molecular weight in a certain range. The research on pullulan started in West Germany, and the British also di...

AI Technical Summary

Problems solved by technology

At present, the post-extraction production process of polysaccharides (such as xanthan gum, thermosetting polysaccharide, gellan gum) uses organic solvents such as alcohol and isopropanol as dehydrating agents to dehydrate the polysaccharide fermentation broth, and simultaneously decolorize and desalt the product. Then dry, because a large amount of organic solvents are used in the production process, so the distillation recovery of organic solvents needs to consume a large amount of steam, and because these organic solvents are flammable and explosive, there are great unsafe factors in the production process

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