Journal
CARBOHYDRATE POLYMERS
Volume 163, Issue -, Pages 54-61Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.01.026
Keywords
Electron-beam plasma; Plasma-stimulated hydrolysis; Chitin; Chitosan; Bioactive oligosaccharides
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Funding
- Ministry of Education and Science of the Russian Federation
- Russian Foundation for Basic Research (RFBR) [15-08-05724_a]
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The controlled degradation of solid powders of chitin and chitosan stimulated by electron-beam plasma (EBP) was experimentally studied. Crab shell chitin and chitosan were used as original substances. The non-equilibrium low temperature EBP was generated by injecting an electron beam into a gaseous medium. Chitooligosaccharides with M-w = 800-2000 Da and polydispersion 1.5-2.5 were formed due to the EBP-treatment of chitin and chitosan. The beta-1,4 glycosidic bounds in original polymers degrade under the action of active oxygen species produced in the EBP. Low molecular weight products of chitosan inhibited the growth of various yeast-like and filamentous fungi at minimum inhibitory concentration 500 mcg/ml. By optimizing the treatment conditions and using special techniques of reaction volume formation the 95% yield of chitooligosaccharides was obtained after 2 min whereas the conventional chemical hydrolysis usually takes several days. The EBP-stimulated hydrolysis is promising for effective polysaccharides degradation and can be competitive with traditional technologies. (C) 2017 Elsevier Ltd. All rights reserved.
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