Detalhes bibliográficos
Autor(a) principal: |
Silva, Filipa M. |
Data de Publicação: |
1999 |
Outros Autores: |
Silva, Cristina L. M. |
Tipo de documento: |
Artigo
|
Idioma: |
eng |
Título da fonte: |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: |
http://hdl.handle.net/10400.14/6553
|
Resumo: |
Colour changes in thermally treated cupuaçu (Theobroma grandiflorum) fruit puree were modelled mathematically. Isothermal experiments in the temperature range of 80–115 °C were performed and colour was measured by a tristimulus colorimeter. At each temperature total colour difference (TCD*) increased and normalized L* decreased with processing time, both following a power law model. The power of the model was temperature-dependent and described by the Arrhenius law. To estimate the model constants, a one-step non-linear regression was performed on all data. Activation energies of 31 and 36 kJ/mol were determined for TCD* and normalized L*, respectively. These results should prove useful in the design of pasteurization processes which minimize colour changes in cupuaçu puree |