Natural Proteolysis in Whey and Susceptibility of Whey Proteins to Acidic Proteases of Rennet

Jost, Rolf; Monti, J. C.; Hidalgo, J.

doi:10.3168/jds.s0022-0302(76)84406-2

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…Casein hydrolysis was affected by the heat induced K-casein/8-lg complex and was dependent on the specificity of the enzymes used (23). Rennet wheys exhibited a negligible endopeptidase activity which indicated the absence of both neutral and alkaline proteases (73). Hydrolysis of whey proteins by milk clotting enzymes occurred in the following order of activity: MPP>PP>rennet and the hydrolytic activity was higher at pH 5.5 than 6.5; however, heat treatment progressively reduced proteolytic susceptibility (24).…”

Section: Milk Clotting Enzymesmentioning

confidence: 99%

Factors Affecting Measurement of Undenatured Whey Protein Nitrogen in Dried Whey by a Modified Harland-Ashworth Test

Mahmoud

Brown

Ernstrom

1990

Journal of Dairy Science

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Section: Milk Clotting Enzymesmentioning

confidence: 99%

Factors Affecting Measurement of Undenatured Whey Protein Nitrogen in Dried Whey by a Modified Harland-Ashworth Test

Mahmoud

Brown

Ernstrom

1990

Journal of Dairy Science

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Effect of Processing on Whey Protein Functionality

Schmidt

Packard

Morris

1984

Journal of Dairy Science

127

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Variability in True Protein, Casein, Nonprotein Nitrogen, and Proteolysis in High and Low Somatic Cell Milks

Verdi¹,

Barbano²,

Dellavalle³

et al. 1987

Journal of Dairy Science

144

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Monthly variation in milk protein (total nitrogen X 6.38) and milk fat was determined for 115 farms over 2 yr. Yearly average milk protein and fat tests in each year were 3.16 and 3.62%, respectively. The mean regression coefficient for milk protein with respect to milk fat was .47 for the entire period. Twenty-four farms were selected and grouped high or low based on their previous 2-yr somatic cell history. Monthly milk samples for each farm were tested for direct microscopic somatic cell count, total nitrogen, noncasein nitrogen, and nonprotein nitrogen. No differences in monthly nonprotein nitrogen, true protein, and casein were found between groups. Casein as a percent of total nitrogen was significantly higher for the low somatic group for seven of the 12 mo studied but was significantly higher for 9 mo when expressed as a percent of true protein. The average increase in tyrosine value for incubated preserved milk was significantly higher for the high somatic cell milk, indicating higher proteolytic activity in high somatic cell milk. Electrophoretic analysis of high and low somatic cell milk indicated that there was substantial proteolytic breakdown of alpha S-casein and beta-casein by proteases associated with elevated somatic cell counts.

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Natural Proteolysis in Whey and Susceptibility of Whey Proteins to Acidic Proteases of Rennet

Cited by 5 publications

References 6 publications

Factors Affecting Measurement of Undenatured Whey Protein Nitrogen in Dried Whey by a Modified Harland-Ashworth Test

Factors Affecting Measurement of Undenatured Whey Protein Nitrogen in Dried Whey by a Modified Harland-Ashworth Test

Effect of Processing on Whey Protein Functionality

Variability in True Protein, Casein, Nonprotein Nitrogen, and Proteolysis in High and Low Somatic Cell Milks

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