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Research-Article| Volume 72, ISSUE 10, P2457-2463, October 1989

Rennet Coagulation of Milk Retentates. 2. The Combined Effect of Heat Treatments and Protein Concentration

  • Ernestina Casiraghi
    Affiliations
    Dipartimento di Scienze e Tecnologie Alimentari e Microbiologiche, Sezione Tecnologie Alimentari, Universita’ degli Studi di Milano, Via Celoria 2, 20133 Milano, Italy
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  • Mara Lucisano
    Affiliations
    Dipartimento di Scienze e Tecnologie Alimentari e Microbiologiche, Sezione Tecnologie Alimentari, Universita’ degli Studi di Milano, Via Celoria 2, 20133 Milano, Italy
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  • Claudio Peri
    Affiliations
    Dipartimento di Scienze e Tecnologie Alimentari e Microbiologiche, Sezione Tecnologie Alimentari, Universita’ degli Studi di Milano, Via Celoria 2, 20133 Milano, Italy
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      Abstract

      The aim of this research was to study the clotting kinetics, curd hardening, and whey syneresis of milk concentrated by UF. Experiments were conducted on raw, pasteurized, and UHT-treated milks to verify whether the depression of coagulation characteristics caused by heat treatments of milk could be reversed by the increase in protein concentration.
      Data demonstrate that rennin action on milk strongly depends on the severity of heat treatment and that curd consistency is influenced both by heat treatment and protein concentration. Ultrafiltration modifies the viscoelastic behavior of curd, resulting in a marked increase in the viscous component at increasing protein concentration. Syneresis decreases as protein concentration increases and is strongly affected by pasteurization and UHT treatment.

      Referenecs

        • Association of Official Analytical Chemists
        Official methods of analysis.
        14th ed. Assoc. Offic. Anal. Chem., Washington, DC1984
        • Bnile G.N.
        • Maubois J.L.
        • Fauquant J.
        Étude de la teneur en élements mineraux des produits obtenuslors de l’ultrafiltration du lait sur membrane.
        Le Lait. 1974; 54: 600
      1. Casiraghi, E. 1986. Effetti della concentrazione del latte per ultrafiltrazione sulle cinetiche di coagulazione en-zimatica e di sineresi e sulla rcologia dei coaguli. Ph.D.Diss, Univ. Milan, Italy

        • Casiraghi E.
        • Lucisano M.
        • Piazza L.
        Rennetcoagulation of milk retentates. I. The effect of thermal and mechanical stresses associated with ultrafiltration.
        J. Dairy Sci. 1989; 72: 2452
        • Culioli J.
        • Sherman P.
        Rheological aspects of the renneting of milk concentrated by ultrafiltration.
        J. Texture Stud. 1978; 9: 257
        • Dalgleish D.G.
        Effect of milk concentration on the rennet coagulation time.
        J. Dairy Res. 1980; 47: 231
        • Dalgleish D.G.
        Effect of milk concentration on the nature of curd formed during renneting - a theoretical discussion.
        J. Dairy Res. 1981; 48: 65
        • Darling D.F.
        • Hooydonk A.C.M.
        Derivation of a mathematical model for the mechanism of casein micelle coagulation by rennet.
        J. Dairy Res. 1981; 48: 189
      2. Donati, E. 1984. Applicazione di parametri cinetici e reologici allo studio della coagulazione di latti concentrati per ultrafiltrazione. M. S. Thesis, Univ. Milan, Italy.

        • Gamot P.
        • Corre C.
        Influence of milk protein concentration on the gelling activity of chymosin and bovine pepsin.
        J. Dairy Res. 1980; 47: 103
        • Gamot P.
        • Rank T.C.
        • Olson N.F.
        Influence of protein and fat contents of ultrafiltered milk onrheological properties of gels formed by chymosin.
        J. Dairy Sci. 1982; 65: 2267
        • Inokuchi K.
        Rheology of surface films. IV. Viscoelastic properties of 6 nylon films at air-water interface.
        Bull. Chem. Soc. (Jpn.). 1955; 28: 453
        • Green M.L.
        • Marshall R.J.
        • Glover F.A.
        Influence of homogenization of concentrated milks on the structure and properties of rennet curds.
        J. Dairy Res. 1983; 50: 341
        • Kesslcr H.G.
        Food engineering and dairy technology.
        Verlag A. Kessler, Freising, FRG1981
        • Lucisano M.
        • Peri C.
        • Donati E.
        Studies on coagulation of milk ultrafiltration retentates. I. Coagulation kinetics.
        Milchwissenschaft. 1985; 40: 600
        • Marshall R.J.
        An unproved method for measurement of the syneresis of curd formed by rennet action of milk.
        J. Dairy Res. 1982; 49: 329
        • Mehaia M.A.
        • Cherian M.
        The secondaryphase of milk coagulation Effect of calcium, pH and temperature on cloning activity.
        Milchwissenschaft. 1983; 38: 137
        • Peleg M.
        Characterization of the stress-relaxation curve of solid foods.
        J. Food Sci. 1979; 44: 277
        • Peri C.
        • Lucisano M.
        • Donati E.
        Studies on coagulation of milk ultrafiltration retentates. II. Kinetics of whey syneresis.
        Milchwissenschaft. 1985; 40: 650
        • Qvist K.B.
        Reestablishment of the original rennetability of milk after cooling. The effect of cooling and LTST pasteurization of milk and renneting.
        Milchwissenschaft. 1979; 34: 467
        • Schumtz M.
        • Puhan Z.
        Rennet coagulation of ultrafiltered milk.
        Schweiz. Milchw. Forshung. 1978; 7: 69
        • Stony J.E.
        • Ford G.D.
        Development of coagulum firmness in renneted milk - a two-phase process.
        J. Dairy Res. 1982; 49: 343
        • Stony J.E.
        • Grandison A.S.
        • Millard D.
        • Owen A.J.
        • Ford G.D.
        Chemical composition and coagulating properties of renneted milks from different breeds and species of ruminant.
        J. Dairy Res. 1983; 50: 215
        • Tumerman L.
        • Webb B.H.
        Coagulation of milk and protein denaturation.
        in: Webb B.H. Johnson A.H. Fundamentals of dairy chemistry. AVI Publ. Co. Inc., Westport, CT1965: 506-589
        • Von Reuter H.
        • Hisserrich D.
        • Prokopek D.
        Beitrag zur Formalkinetik der Labgerinnung von durch Ultrafiltration Konzentrierter Milch.
        Milchwissenschaft. 1981; 36: 13
        • Walstra P.
        • Jenness R.
        Dairy chemistry and physics.
        John Wiley and Sons, New York, NY1984