SciELO - Scientific Electronic Library Online

 
vol.27 número1Use of pH-thermosensitive hydrogels for nickel ion removal and recoveryCharacterization of low cost orally disintegrating film (ODF) índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

ALVES, Helton José et al. Effect of shrimp shells milling on the molar mass of chitosan. Polímeros [online]. 2017, vol.27, n.1, pp.41-47. ISSN 1678-5169.  http://dx.doi.org/10.1590/0104-1428.2354.

Shrimp shells are a raw material rich in chitin, a precursor of chitosan biopolymer. The variables of processing (demineralization, deproteination and deacetylation) can be manipulated to determine the main characteristics of chitosan, the degree of deacetylation (DD), and average molar mass. This study evaluated the influence of one of the unit operations of shrimp shell physical processing, the milling, on the final product characteristic, chitosan. After different milling conditions, the raw material was subjected to standard chemical processing for chitin extraction, followed by deacetylation to obtain chitosan, which is characterized by 1H NMR, SEM, XRD, N2 physisorption (BET) and viscometry. The results indicated that the milling time of the raw material can be manipulated to increase the material depolymerization, significantly influencing the molecular weight reduction of chitosan a desirable feature for many applications of this biopolymer, and usually obtained by complex chemical and enzymatic methods.

Palavras-chave : biopolymers; chitosan; degree of polymerization (DP); viscosity; particle size distribution.

        · texto em Inglês     · Inglês ( pdf )