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Comparative study on structural features of α chitin from Xiphopenaeus kroyeri and its precipitated product from phosphoric acid solution
Author(s) -
Andrade C. T.,
Silva K. M. P.,
Tavares M. I.,
Simão R. A.,
Achete C.,
Pérez C. A.
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.10017
Subject(s) - chitin , phosphoric acid , demineralization , aqueous solution , materials science , precipitation , hydrogen bond , chemistry , crystallography , nuclear chemistry , chemical engineering , organic chemistry , composite material , molecule , chitosan , enamel paint , meteorology , engineering , physics
A sample of α chitin was obtained from shells of the shrimp Xiphopenaeus kroyeri by demineralization and deproteinization processes. This sample of native α chitin (NC) was dissolved in concentrated phosphoric acid and recovered by precipitation in an alkaline aqueous solution, giving rise to a sample named PC. Solid‐state carbon‐13 nuclear magnetic resonance ( 13 C‐NMR), X‐ray diffraction, and atomic force microscopy (AFM) techniques were used to compare both samples and to investigate structural changes in α chitin under the action of phosphoric acid. 13 C‐NMR experiments and X‐ray diffraction results revealed a high crystalline order in both samples. Structural differences were due to the higher distance between adjacent chains along the b axis and the consequent decrease in the number of intermolecular hydrogen bonds in the sample recovered from solution. While remarkable supramolecular differences could be observed in the fibrillar crystals of the NC sample, the PC sample was characterized by only one type of morphology. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 151–159, 2002