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Some Properties of Freeze-Dried Milk1

  • Author Footnotes
    2 The data in this paper are taken from a thesis presented by T. A. Nickerson in partial fulfillment of the requirements for the Ph.D. degree, University of Minnesota, 1950.
    ,
    Author Footnotes
    3 Now at the University of California, Division of Dairy Industry, Davis.
    T.A. Nickerson
    Footnotes
    2 The data in this paper are taken from a thesis presented by T. A. Nickerson in partial fulfillment of the requirements for the Ph.D. degree, University of Minnesota, 1950.
    3 Now at the University of California, Division of Dairy Industry, Davis.
    Affiliations
    Divisions of Dairy Husbandry and Agricultural Biochemistry University of Minnesota, St. Paul
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  • S.T. Coulter
    Affiliations
    Divisions of Dairy Husbandry and Agricultural Biochemistry University of Minnesota, St. Paul
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  • Robert Jenness
    Affiliations
    Divisions of Dairy Husbandry and Agricultural Biochemistry University of Minnesota, St. Paul
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  • Author Footnotes
    1 Paper no. 2687 Scientific Journal Series, Minnesota Agricultural Experiment Station.
    2 The data in this paper are taken from a thesis presented by T. A. Nickerson in partial fulfillment of the requirements for the Ph.D. degree, University of Minnesota, 1950.
    3 Now at the University of California, Division of Dairy Industry, Davis.
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      Summary

      The effect of freeze-drying milk on the physical state of certain milk constituents and on the keeping qualities of the resulting powder has been studied. The fat emulsion of freeze-dried powder is partially destabilized. The presence of free fat in the powder makes reconstitution difficult.
      No crystallization of the lactose is evident in the spray- and freeze-dried powders. The data show that the ratio of β to a lactose in these powders is dependent upon the temperature of drying. The ratio in spray-dried powder closely approaches the equilibrium ratio in a lactose solution at 212° F., while the ratio in freeze-dried powder closely approaches that at 32° F.
      Flavor and keeping quality characteristics of freeze-dried milk are essentially the same as for spray-dried whole milk powder. Both dry milks have essentially the same flavor characteristics when fresh and both become tallowy in storage. They also may exhibit deterioration of the type associated with the Maillard reaction. The freeze-dried powder, however, frequently acquires a fruity flavor which is not apparent in spray-dried milk.
      Freeze-drying by the methods used in this study does not produce a more satisfactory product than spray-dried milk.

      References

      1. Anonymous. Food and Container Problems of the Armed Forces. Associates, Food and Container Inst., 1849 W. Pershing Rd., Chicago, Ill. 1 February, 1951.

        • Chapman R.A.
        • McFarlane W.D.
        A Colorimetric Method for the Estimation of Reducing Groups in Milk Powders.
        Can. J. Research. 1945; 23B: 91-99
        • Choi R.P.
        • Tatter C.W.
        • O’Malley C.M.
        • Fairbanks B.W.
        A Solubility Method for the Determination of Alpha and Beta Lactose in Dry Products of Milk.
        J. Dairy Sci. 1949; 32: 391-397
        • Coulter S.T.
        The Keeping Quality of Dry Whole Milk Spray Dried in an Atmosphere of an Inert Gas.
        J. Dairy Sci. 1947; 30: 995-1002
        • Coulter S.T.
        • Jenness R.
        Packing Dry Whole Milk in Inert Gas.
        Univ. of Minn. Agr. Expt. Sta., Tech. Bull. 1945; : 167
        • Crowe L.K.
        • Jenness R.
        • Coulter S.T.
        The Reducing Capacity of Milk and Milk Products as Measured by a Modified Ferricyanide Method.
        J. Dairy Sci. 1948; 31: 595-610
        • Findlay J.D.
        • Smith J.A.B.
        • Lea C.H.
        Experiments on the Use of Antioxidants in Spray-dried Whole Milk Powder.
        J. Dairy Research. 1945; 14: 165-175
        • Findlay J.D.
        • Higgenbottom C.
        • Smith J.A.B.
        • Lea C.H.
        The Effect of Preheating Temperature on the Bacterial Count and Storage Life of Whole Milk Powder Spray-dried by the Krause Process.
        J. Dairy Research. 1946; 14: 378-399
        • Flosdorf E.W.
        Freeze-drying. Drying by Sublimation.
        1st ed. Reinhold Publ. Corp, New York1949 (280 pp)
        • Gillis J.
        Nouvelles recherches sur le sucre de lait.
        Rec. trav. chim. 1920; 39: 88-125
        • Harland H.A.
        • Ashworth U.S.
        The Use of Thiamine Disulfide for the Estimation of Reducing Substances in Processed Milk.
        J. Dairy Sci. 1945; 28: 15-23
        • Harland H.A.
        • Coulter S.T.
        • Jenness R.
        Some Factors Influencing the Reducing Systems in Dry Whole Milk.
        J. Dairy Sci. 1949; 32: 334-344
        • Hauser E.A.
        • Hering H.
        Reactions thermodynamiques chez les poudres de lait. Leur emploi pour le dosage rapide de leur teneur en eau.
        Lait. 1924; 4: 389-394
        • Hills G.L.
        • Thiel G.C.
        The Ferric Thiocyanate Method of Estimating Peroxide in the Fat of Butter.
        Milk and Dried Milk. J. Dairy Research. 1946; 14: 340-353
        • Hollender H.A.
        • Tracy P.H.
        The Relation of the Use of Certain Antioxidants and Methods of Processing to the Keeping Quality of Powdered Whole Milk.
        J. Dairy Sci. 1942; 25: 249-274
        • Holm G.E.
        • Greenback G.R.
        • Deysher E.F.
        Results of Preliminary Experiments upon the Effect of Separating, or Clarifying and Pasteurizing of a Milk upon the-Keeping Quality of its Milk Powder.
        J. Dairy Sci. 1926; 9: 512-516
        • Jack E.L.
        • Henderson J.L.
        Preventing Off-flavors in Dried Whole Milk.
        Food Inds. 1942; 14: 50-52
        • Mattick A.T.R.
        • Hiscox E.R.
        • Crossley E.L.
        • Lea C.H.
        • Findlay J.D.
        • Smith J.A.B.
        • Thompson S.Y.
        • Kon S.K.
        The Effect of Temperature of Preheating, of Clarification and of Bacteriological Quality of the Raw Milk on the Keeping Properties of Whole Milk Powder Dried by the Kestner Spray Process.
        J. Dairy Research. 1945; 14: 116-159
        • Sharp P.F.
        Seeding Test for Crystalline Beta Lactose.
        J. Dairy Sci. 1938; 21: 445-449
        • Sharp P.F.
        • Doob Jr., H.
        Quantitative Determination of Alpha and Beta Lactose in Dried Milk and Dried Whey.
        J. Dairy Sci. 1941; 24: 589-602
        • Troy H.C.
        • Sharp P.F.
        Alpha and Beta Lactose in Some Milk Products.
        J. Dairy Sci. 1930; 13: 140-157