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https://hdl.handle.net/1822/13446
Título: | Drying kinetics of biofilms obtained from chestnut starch and carrageenan with and without glycerol |
Autor(es): | Moreira, R. Chenlo, F. Torres, M. D. Prieto, D. M Sousa, A. M. M. Hilliou, L. Gonçalves, M. P. Silva Blanco, C. |
Palavras-chave: | Biofilms Mechanical properties Modelling Shrinkage |
Data: | 2011 |
Editora: | Taylor & Francis |
Revista: | Drying Technology |
Resumo(s): | Drying kinetics of biofilms from chestnut starch and hybrid carrageenan were experimentally determined and modelled. The biofilms were obtained by mixing the respective solutions (4.0% w/w) of both substances in the proportion 80/20 of chestnut starch/hybrid carrageenan. Glycerol (at 5.0% w/w) was added to some biofilms. Biofilms were prepared using a casting method. Drying kinetics were performed at 30, 40, and 50 C for forced air convection (1.8 0.1 m/s) and 30 and 50 C for natural convection. Constant drying rate period, above critical moisture content (5.4 and 4.2 kg water/kg d.b. without and with glycerol, respectively) allowed the evaluation of the heat transfer coefficients. The water diffusion coefficients were determined in the falling rate period assuming a semi-infinite slab with variable thickness. Water sorption isotherms of biofilms at 25 C were determined and fitted with the GAB model. Mechanical properties of different biofilms showed no significant differences for Young’s modulus values (44.0 4.6 MPa). Nevertheless, films prepared at 30 C under natural drying showed the lowest values of tensile strength and elongation (32.2 4.9MPa and 0.85 0.11%). |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/13446 |
DOI: | 10.1080/07373937.2011.563000 |
ISSN: | 1532-2300 |
Versão da editora: | http://www.tandfonline.com/doi/abs/10.1080/07373937.2011.563000 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | IPC - Artigos em revistas científicas internacionais com arbitragem |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Drying_Technol_29_1058_1065_2011.pdf Acesso restrito! | 321,15 kB | Adobe PDF | Ver/Abrir |