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Thermal Evaporation: Representation of Rise in Boiling Point of Grapefruit JuiceDepartamento de Engenharia e Tecnologia de Alimentos, Universidade Estadual Paulista, São José do Rio Preto, São Paulo, 15054-000, Brazil
División de Estudios de Posgrado e Investigación, Maestría en Ciencias en Ingeniería Química, Instituto Tecnologico de Orizaba, Orizaba, Veracruz, 94 320, México
Departamento de Engenharia e Tecnologia de Alimentos, Universidade Estadual Paulista, São José do Rio Preto, São Paulo, 15054-000, Brazil
Departamento de Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, 13635-900, Brazil, gabas{at}usp.br The rise in boiling point of grapefruit juice was experimentally measured at soluble solids concentrations in the range of 9.3—60.6 °Brix and pressures between °6.0 x 10 3 and 9.0 x 104 Pa. Different approaches to represent experimental data, including the Dühring's rule, the Antoine equation and empirical models proposed in the literature were tested. In the range of 9.3—29.0 °Brix, the rise in boiling point was nearly independent of pressure, varying only with juice concentration. Considerable deviations of this behavior began to occur at concentrations higher than 29.0 °Brix. Experimental data could be best predicted by adjusting an empirical model, which consisted of a single equation that takes into account the dependence of rise in boiling point on pressure and concentration.
Key Words: evaporation concentration vapour pressure grapefruit juice
Food Science and Technology International, Vol. 13, No. 3,
225-229 (2007) |
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