At 60 days of ripening, cheeses made from UHPH-treated milk
presented the lowest hydrolysis of this casein. These results are not
in accordance with those expected, because hydrolysis of as1-cn is
due mainly to the residual chymosin retained in the curd, and UHcheeses
exhibited the highest activity of this enzyme. A possible
explanation could be that the conformational changes of proteins
produced by the UHPH treatment of milk would make the protein
less available for the enzyme. UHPH partially removes parts of the
casein micellar surface, allowing the binding of inner proteins with
milk fat globule membrane proteins, with the formation of new
chimerical particles (Zamora, Ferragut, Guamis, & Trujillo, 2012).
Therefore, in the present study, the greater retention of chymosin in
the curd was not translated to a higher hydrolysis of as1-cn.