Growth response of Eurotium chevalieri, Aspergillus fumigatus and Penicillium brevicompactum in Argentine milk jam
Milk jam (dulce de leche) is a typical Argentine sweet spread prepared from milk concentrated by evaporation to about 70% w/w total solids at atmospheric pressure with added sucrose, glucose and vanillin. Growth of xerotolerant moulds represents a severe problem in this type of product with high sug...
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| Autores principales: | , , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_10820132_v11_n4_p297_Char |
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| Sumario: | Milk jam (dulce de leche) is a typical Argentine sweet spread prepared from milk concentrated by evaporation to about 70% w/w total solids at atmospheric pressure with added sucrose, glucose and vanillin. Growth of xerotolerant moulds represents a severe problem in this type of product with high sugar concentration. This work aimed at analysing the influence of water activity (a w , range 0.74-0.85), pH (5.5 and 6.0) and the addition of 1,000ppm potassium sorbate on Eurotium chevalieri, Aspergillus fumigatus and Penicillium brevicompactum growth response in milk jam stored at 25°C or 35°C during 90 days. Growth curves were successfully modelled by applying the modified version of Gompertz equation. There were proposed polynomials equations relating time to detection, X, with two independent variables: potassium sorbate and water activity at pH 6.0. Some useful combinations of these factors were found to assure inhibition of mould growth during a critical storage period. Results might contribute to optimise manufacture conditions and/or milk jam composition to obtain a safer product when failure occurs during the hot filling process or when the product is stored for a long period of time. © 2005 Sage Publications. |
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