Abstract
Cheese production is the result of complex biochemical events that start by indigenous and microbial enzymes existing in raw milk. The addition of exogenous enzyme (rennet) converts milk into cheese. Among the occurrence of biochemical events, proteolysis is the most important. A proteomic approach has been proved to be the most powerful analytic strategy to monitor proteolysis and characterize cheeses. Indeed, when employing electrophoretic and chromatographic techniques coupled with mass spectrometry, it has been possible to establish the qualitative/quantitative composition and fragmentation of the four casein fractions. The use of two-dimensional gel electrophoresis allow the study of the heterogeneity of caseins due to genetic polymorphism, post-transcriptional, and post-translational modifications, as well as their effect on cheese processing. Furthermore, the differences revealed in two-dimensional gel electrophoresis maps and liquid chromatography profiles are identified by mass spectrometry contributing to understanding proteolysis during the ripening process and to establishing cheese authenticity.
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Notes
- 1.
Lactodynamographic parameters: (r)—renneting time in minutes; (K20)—rate of curd formation measured by time taken from lactodynamographic output to reach the amplitude of 20 mm; (a30)—curd firmness measured 30 min after rennet addition. In addition to previous lactodynamographic parameters it is increasingly useful to employ a 1/2r which provides information about curd firmness at one half of renneting time.
- 2.
Natural starters are a very complex association of micro-organisms used for producing traditional cheese in artisanal dairies. These micro-organisms strongly contribute to the peculiar organoleptic features of these products, whereas selected starters give raise to “nonspecific” cheeses.
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Di Luccia, A. et al. (2013). Cheese Processing. In: Toldrá, F., Nollet, L. (eds) Proteomics in Foods. Food Microbiology and Food Safety, vol 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4614-5626-1_14
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