Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/9170
Título: | Enzymatic degradation of starch thermoplastic blends using samples of different thickness |
Autor(es): | Araújo, M. Alberta Cunha, A. M. Mota, M. |
Data: | Fev-2009 |
Editora: | Springer Science |
Revista: | Journal of Materials Science: Materials in Medicine |
Citação: | "Journal of Materials Science : materials in medicine." ISSN 0957-4530. 20:2 (Fev. 2009) 607–614. |
Resumo(s): | The material studied was a thermoplastic blend of corn starch with a poly(ethylene-vinyl alcohol) copolymer, SEVA-C. The influence of both the material’s exposed surface and enzyme concentration on degradation kinetics was studied. As α-amylase is present in the blood plasma, experiments were performed, varying the material thickness and the α-amylase between 50 and 100 units/l, at 37°C, lasting up to 90 days. Four different batches using SEVA-C and starch samples of different thickness were performed. The positive correlation between degradation rate and the exposed material surface was confirmed, since thin films with larger exposed surfaces were degraded faster than thick square plates having the same total mass. The degradation extent depends on the total amount of amorphous starch present in the formulation rather than on the amount of enzyme used and the minimum thickness to ensure maximum degradation was estimated to be close to 0.25 mm. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/9170 |
DOI: | 10.1007/s10856-008-3601-4 |
ISSN: | 0957-4530 1573-4838 |
Versão da editora: | http://www.springer.com/ |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series IPC - Artigos em revistas científicas internacionais com arbitragem |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Araujo_JMSMM[1].pdf | 539,43 kB | Adobe PDF | Ver/Abrir |