Journal
PROCESS BIOCHEMISTRY
Volume 73, Issue -, Pages 102-108Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2018.07.017
Keywords
Chitosan; Chitooligosaccharides; Chitosanase; Chitinase; Bacillus thuringiensis; Oligosaccharides
Categories
Funding
- Spanish Ministry of Economy and Competitiveness [BIO2013-48779-C4-1/-4, BIO2016-76601-C3-1-/2-]
- COST-Action [CM1303]
- Fundacion Ramon Areces
- Spanish Ministry of Education [FPU13/01185]
Ask authors/readers for more resources
Starting from a commercial preparation of Bacillus thuringiensis var. aizawai, widely employed as biopesticide in agriculture, we obtained a chitosanolytic activity by washing the cells with concentrated sodium acetate. The optimum pH and temperature values for this enzyme were 6.0 and 60 degrees C, respectively. The enzymatic extract efficiently hydrolyzed various chitosans with different deacetylation degrees (DD) into small oligosaccharides. Combining mass spectrometry (ESI-Q-TOF) and high-performance anion-exchange chromatography with pulsed amperometric detection (HPAEC-PAD), we observed the formation of fully deacetylated chitooligosaccharides [fdCOS, (GlcN)(2.5)] and, to a lesser extent, partially acetylated chitooligosaccharides [paCOS, GIcNAc-(GlcN)(1-3)]. A 10 g/L solution of chitosan with 600-800 kDa and DD >= 90% was fully converted into oligosaccharides in 55 h. Most of the products were fdCOS: 1.6 g/L of chitobiose, 1.7 g/L of chitotriose, 5 g/L of chitotetraose and 1.4 g/L of chitopentaose.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available