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Related Experiment Videos

Post-secretory aggregation of caseins.

B E Brooker, C Holt

    The Journal of Dairy Research
    |April 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Large casein particles in milk may form after secretion, potentially through continued micelle assembly or limited proteolysis. Further research is needed to fully understand these casein aggregation mechanisms in milk.

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    Area of Science:

    • Dairy science
    • Biochemistry
    • Food science

    Background:

    • Unusually large micrometer-diameter particles are occasionally observed in normal milk and commonly in colostrum.
    • These particles resemble casein micelles but are too large to form within Golgi vesicles.

    Purpose of the Study:

    • To investigate the mechanisms of post-secretory casein aggregation in milk.
    • To explore potential causes for the formation of large casein particles.

    Main Methods:

    • Observation of large particles in milk and colostrum.
    • Dissociation of particles using ethylenediaminetetraacetic acid (EDTA).
    • Incubation of milk with fibrinolysin to test proteolysis aggregation.

    Main Results:

    Related Experiment Videos

    • Observed particles resemble casein micelles and can be dissociated by EDTA.
    • Particle size suggests post-secretory aggregation occurs.
    • Fibrinolysin treatment did not induce aggregation of normal micelles.

    Conclusions:

    • Post-secretory aggregation of caseins is a likely cause of large particle formation in milk.
    • Continued micelle assembly in the alveolus is a potential aggregation mechanism.
    • Limited proteolysis by fibrinolysin is unlikely to be the primary cause of aggregation.