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Titolo:
Comparative study on structural features of alpha chitin from Xiphopenaeuskroyeri and its precipitated product from phosphoric acid solution
Autore:
Andrade, CT; Silva, KMP; Tavares, MI; Simao, RA; Achete, C; Perez, CA;
Indirizzi:
Univ Fed Rio de Janeiro, Inst Macromol Prof Eloisa Mano, BR-21945970 Rio De Janeiro, Brazil Univ Fed Rio de Janeiro Rio De Janeiro Brazil BR-21945970 BCeiro, Brazil Univ Fed Rio de Janeiro, COPPE, Programa Engn Met & Mat, BR-21945970 Rio De Janeiro, Brazil Univ Fed Rio de Janeiro Rio De Janeiro Brazil BR-21945970 BCeiro, Brazil Univ Fed Rio de Janeiro, COPPE, Programa Engn Quim, Nucleo Catalise, BR-21945970 Rio De Janeiro, Brazil Univ Fed Rio de Janeiro Rio De Janeiro Brazil BR-21945970 BCeiro, Brazil
Titolo Testata:
JOURNAL OF APPLIED POLYMER SCIENCE
fascicolo: 1, volume: 83, anno: 2002,
pagine: 151 - 159
SICI:
0021-8995(20020103)83:1<151:CSOSFO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATOMIC-FORCE MICROSCOPY; NUCLEAR-MAGNETIC-RESONANCE; POLYMORPHS; NMR; POLYSACCHARIDES; SPECTROSCOPY; ASSEMBLIES;
Keywords:
crystallization; solid-state structure; atomic force microscopy (AFM);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Andrade, CT Univ Fed Rio de Janeiro, Inst Macromol Prof Eloisa Mano, POB 68525, BR-21945970 Rio De Janeiro, Brazil Univ Fed Rio de Janeiro POB 68525 Rio De Janeiro Brazil BR-21945970 BC
Citazione:
C.T. Andrade et al., "Comparative study on structural features of alpha chitin from Xiphopenaeuskroyeri and its precipitated product from phosphoric acid solution", J APPL POLY, 83(1), 2002, pp. 151-159

Abstract

A sample of a chitin was obtained from shells of the shrimp Xiphopenaeus kroyeri by demineralization and deproteinization processes. This sample of native a 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 (C-13-NMR), X-ray diffraction, and atomic force microscopy (A-FM) techniques were used to compare both samples and to investigate structural changes in a chitin under the action of phosphoric acid. C-13-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. (C) 2002 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 23:35:49