Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/7319
Título: Kinetic parameters estimation for ascorbic acid degradation in fruit nectar using the partial equivalent isothermal exposures (PEIE) method under non-isothermal continuous heating conditions
Autor: Vieira, M. M. C.
Teixeira, A. A.
Silva, C. L. M.
Data: 2001
Editora: American Chemical Society and American Institute of Chemical Engineers
Resumo: With the purpose of testing the Paired Equivalent Isothermal Exposures (PEIE) method to determine reaction kinetic parameters under non-isothermal conditions, continuous pasteurizations were carried out with a tropical fruit nectar [25% cupuacu (Theobroma grandiflorum) pulp and 15% sugar] to estimate the ascorbic acid thermal degradation kinetic parameters. Fifteen continuous thermal exposures were studied, with seven being cycled. The experimental ascorbic acid thermal degradation kinetic parameters were estimated by the PEIE method (E-a = 73 +/- 9 kJ/mol, k(80 degreesC) = 0.017 +/- 0.001 min(-1)). These values compared very well to the previously determined values for the same product under isothermal conditions (E-a = 73 +/- 7 kJ/mol, k(80 degreesC) = 0.020 +/- 0.001 min(-1)). The predicted extents of reaction presented a good fit to the experimental data, although the cycled thermal treatments presented some deviation. In addition to being easier and faster than the Isothermal method, the PEIE method can be a more reliable method to estimate first-order reaction kinetic parameters when continuous heating is considered.
Peer review: yes
URI: http://hdl.handle.net/10400.1/7319
DOI: https://dx.doi.org/10.1021/bp000132w
ISSN: 8756-7938
Aparece nas colecções:ISE2-Artigos (em revistas ou actas indexadas)

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