The legal Pantanal caiman (Caiman crocodilus yacare) farming, in Brazil, has been stimulated and among meat preservation techniques the salting process is a relatively simple and low-cost method. The objective of this work was to study the sodium chloride diffusion kinetics in farmed caiman muscle during salting. Limited volumes of brine were employed, with salting essays carried at 3, 4 and 5 brine/muscle ratios, at 15%, 20% and 25% w/w brine concentrations, and brine temperatures of 10, 15 and 20 o C. The analytical solution of second Fick s law considering one-dimensional diffusion through an infinite slab in contact with a well-stirred solution of limited volume was used to calculate effective salt diffusion coefficients and to predict the sodium chloride content in the fillets. A good agreement was obtained between the considered analytical model and experimental data. Salt diffusivities in fillets were found to be in the range of 0.47x10 -10 to 9.62x10 -10 m 2 /s.Index terms: Caiman crocodilus yacare, mass transfer, meat, preservation, processing, brines.
Cinética de salga e difusividades de sal em carne de jacaré do Pantanal criado em cativeiroResumo A criação de jacaré do Pantanal (Caiman crocodilus yacare) em cativeiro tem sido estimulada, e entre as técnicas de processamento de sua carne, a salga é um processo de conservação relativamente simples e de baixo custo. O objetivo deste trabalho foi estudar a cinética de difusão de cloreto de sódio em carne de jacaré do Pantanal criado em cativeiro, durante a salga úmida. Foram utilizados volumes limitados de salmoura e os experimentos foram realizados com relações salmoura/músculo de 3, 4 e 5, com concentrações de salmoura de 15%, 20% e 25% em peso e temperaturas de 10, 15 e 20 o C. A solução analítica da segunda lei de Fick, considerando difusão unidimensional em uma placa infinita em contato com uma solução bem agitada de volume limitado, foi utilizada para calcular os coeficientes de difusão efetivos de sal e estimar o conteúdo de cloreto de sódio nos filés. Obteve-se boa concordância entre o modelo analítico considerado e os dados experimentais. As difusividades do sal nos filés ocorreram na faixa de 0,47x10 -10 a 9,62x10 -10 m 2 /s. Termos para indexação: Caiman crocodilus yacare, transferência de massa, carne, preservação, processamento, salmoura.in the Pantanal, generating pressure for a monitoring program for caiman populations (Mourão et al., 2000).As an alternative to reduce the clandestine harvest, the legal caiman farming has been stimulated, in such a way that the study and development of processing techniques for the caiman meat are essential in order to increase its commercial interest as a complementary activity to the leather trade. The salting process, which is a relatively simple, low-cost method of meat preservation and could be employed even in distant, hard to access places, such as the caiman farms, would be a very interesting way of processing the caiman meat and improving its potential for human consumption. In a previous w...