On the other hand, the differences found in the levels of lipolysis
(TFFA) between cheeses could be caused by the effect produced by
the treatments in the release of intracellular lipase, the availability
of fat and the activity of the enzymes. In this sense, lipolysis is
initiated by physical damage to the milk fat globule membrane
(MFGM), which allows the lipase access to the fat substrate. In the
present study, the lipolysis was favoured in PH-cheeses, which
exhibited the highest FFA content. These results could be explained
by different levels of exposure of the fat to enzyme. Conventional
homogenization of milk reduces fat globule size, damaging the
MFGM and provoking changes on its composition. Both the incorporation
of proteins such as caseins, which brings LPL into intimate
contact with fat, and the increase in fat surface area render fat
globules more susceptible to lipolysis (Deeth, 2006).
On the other hand, the differences found in the levels of lipolysis(TFFA) between cheeses could be caused by the effect produced bythe treatments in the release of intracellular lipase, the availabilityof fat and the activity of the enzymes. In this sense, lipolysis isinitiated by physical damage to the milk fat globule membrane(MFGM), which allows the lipase access to the fat substrate. In thepresent study, the lipolysis was favoured in PH-cheeses, whichexhibited the highest FFA content. These results could be explainedby different levels of exposure of the fat to enzyme. Conventionalhomogenization of milk reduces fat globule size, damaging theMFGM and provoking changes on its composition. Both the incorporationof proteins such as caseins, which brings LPL into intimatecontact with fat, and the increase in fat surface area render fatglobules more susceptible to lipolysis (Deeth, 2006).
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