Masters Theses

Date of Award

6-1979

Degree Type

Thesis

Degree Name

Master of Science

Major

Food Science and Technology

Major Professor

Hugh O. Jaynes

Committee Members

W. W. Overcast, Curtis C. Melton

Abstract

A simple, convenient kit was developed to measure titratable acidity (TA) of milk in farm bulk tanks. The kit was based on the conventional determination of TA with standard base and phenolphthalein. Glass tubes were calibrated to contain a calculated amount of milk and base to show the phenolphthalein endpoint up to a chosen TA level. Samples remaining white would be rejected as TA above the chosen level. A survey using the kit and standard TA titration was carried out in winter and summer on manufacturing and Grade A milks. In 192 samples, TA averaged 0.164% and ranged from 0.11 to 0.31% TA with a standard deviation of 0.021% TA. There was no difference from grades or seasons. The kit test failed on only four samples. Lactic acid content of milk was measured in selected samples by an ether extraction-gas chromatographic method. Good agreement was obtained between the method and added and/or developed acidity determined by titration. Fresh milks with varying TA were shown to contain no lactic acid.

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