摘要
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The aim of this paper was to investigate the role of two types of Penicillium roqueforti moulds (type esportazione and dolce) in the ripening of two Gorgonzola-type cheese varieties. Cheeses were analysed after 4, 14, 30 and 60 da...
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The aim of this paper was to investigate the role of two types of Penicillium roqueforti moulds (type esportazione and dolce) in the ripening of two Gorgonzola-type cheese varieties. Cheeses were analysed after 4, 14, 30 and 60 days of ripening. Microbiological analysis showed high numbers of total bacterial count, yeasts and moulds in both 60-day-old cheese varieties. The concentration of water-soluble N, nonprotein N and 5% phosphotungstic acid-soluble N increased significantly during ripening. Patterns of proteolysis by urea-polyacrylamide gel electrophoresis showed that rind-to-core gradients and age-related changes in moisture and salt content influenced mould and other enzyme activities, which are reflected in various rates of protein degradation. The hydrolysis of alpha s<sub>1</sub>- and beta -caseins was more extensive in the core than under the rind of both cheese varieties.
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