Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/5923
Título: Death kinetics of Lactobacillus bulgaricus in a spray drying process
Autor: Teixeira, P. C.
Castro, M. H.
Kirby, R. M
Palavras-chave: Spray drying
Lactobacillus bulgaricus
kinetics
Activation Energy
Data: 1995
Editora: International Association for Food Protection
Citação: TEIXEIRA, P. C.; CASTRO, M. H.; KIRBY, R. M. - Death kinetics of Lactobacillus bulgaricus in a spray drying process. Journal of Food Protection. ISSN 0362-028X. Vol. 58 n.º 8 (1995), p. 934-936(3)
Resumo: Survival of Lactobacillus bulgaricus during spray drying was studied at various outlet air temperatures. During spray drying the logarithmic survival ratio decreased with increased outlet air temperature with first-order kinetics; the pseudo-z value for Lactobacillus bulgaricus was 17.3°C. Plots of the death-rate constant for Lactobacillus bulgaricus versus reciprocal outlet temperature during spray drying in skim milk show a curve with two different activation energies (Ea). The calculated Ea values were 33.47 kJ/mol above 70°C and 85.77 kJ/mol below 70°C. Thermodynamic quantities for spray drying of Lactobacillus bulgaricus are also presented. Results show that the relationship between the entropy of activation and the enthalpy of activation for both spray drying and heating in liquid medium is linear, with all the data for drying falling in the range of a negative entropy.
Peer review: yes
URI: http://hdl.handle.net/10400.14/5923
Versão do Editor: http://www.ingentaconnect.com/content/iafp/jfp/1995/00000058/00000008/art00019
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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