Thermal, structural and acetylation behavior of snail and periwinkle shells chitin

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Gbenebor, O.P.
Akpan, E.I.
Adeosun, S.O.
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This article reports a successful removal of CaCO3 from snail and periwinkle shells for the purpose of producing high quality chitin for possible application as bio-fillers in bone fixation materials. Experiment was designed with varying concentrations of acid and alkali for demineralization, deproteinization and deacetylation of the samples. Thermal characteristics, morphology, degree of de-acetylation, crystalline structure and hydrogen bonding characteristics of the extracted chitin were examined. Infrared spectra, thermogravimetric analysis and X-ray diffraction patterns show that demineralization with 1.7 M HCl led to a successful removal of CaCO3. Subsequent deproteinization and deacetylation with 1.2 M NaOH led to a development of chitosan having a degree of deacetylation of 77 and 60% for periwinkle and snail shells, respectively. Generally, all results show that different treatments led to different chitin structure and consequently different properties.
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Chitin , Chitosan , Macromolecules , Deacetylation , Biofillers , Research Subject Categories::TECHNOLOGY::Other technology
Gbenebor, O.P., Akpan, E.I., Adeosun, S.O. (2017). Thermal, structural and acetylation behavior of snail and periwinkle shells chitin. Springer, 6:97–111