期刊
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
卷 30, 期 3, 页码 357-363出版社
ELSEVIER
DOI: 10.1016/j.msec.2009.11.014
关键词
Chitin; Cicada sloughs; Rice-field crab shells; Extraction; Degree of acetylation
资金
- National Nanotechnology Center (NANOTEC)
- National Science and Technology Development Agency (NSTDA), Thailand [B21-CR0169-10RDCR01]
In this study, a new source of insect chitin was proposed. Insect chitin was extracted from cicada sloughs by 1 M HCl and 1 M NaOH treatment for demineralization and deproteinization, respectively. The brown color of this chitin from cicada sloughs was removed using 6% sodium hypochlorite as an oxidizing agent. It was found that the insect chitin extracted from the cicada sloughs has a higher percent recovery than the chitin from rice-field crab shells. The chemical structure and physicochemical properties of a-chitin from cicada sloughs were characterized using elemental analysis (EA), attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), proton nuclear magnetic resonance spectroscopy (H-1 NMR), solid-state C-13 cross-polarization magic-angle-spinning nuclear magnetic resonance (CP/MAS) NMR spectroscopy, X-ray diffractometry (XRD), and thermogravimetry (TG). The degree of acetylation (DA) was determined by EA, H-1 NMR, and C-13 CP/MAS NMR techniques. The DA values of chitin from cicada sloughs were in the range of 97% to 102% depending on each technique. Furthermore, it was found that the DA increased with an increasing thermal property and crystallinity. (C) 2009 Elsevier B.V. All rights reserved.
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