Comparison of ion-specific electrode and high performance liquid chromatography methods for the determination of iodide in milk.

Two methods for the determination of I- in raw and processed milk were examined. A simple ion-specific electrode (ISE) method was compared against a more complex HPLC reference technique. Accuracy and precision were evaluated both within and between the 2 methods.

A survey of vitamin A and D contents of fortified fluid milk in Ontario.

High performance liquid chromatographic methods for measuring the concentration of vitamins A and D in fluid milk were validated and used to assess the level of these nutrients in Ontario retail milk samples. Thirteen and fifteen fortified milk samples were tested for vitamins A and D, respectively. Repeatability relative standard deviation values for vitamins A and D in milk were generally less than 10%.

Preparation, Use and Evaluation of Standards Developed for Simultaneous Monitoring of Coulter and Fossomatic Electronic Cell Counting Instruments in Ontario.

Special standards for Somatic Cell Counting (SCC) were developed at the Central Milk Testing Laboratory in Guelph for Ontario laboratories performing the tests. One laboratory used a Coulter milk counter for composite herd samples, two laboratories used five Fossomatic counters for cow samples, while the fourth used a Coulter counter for research purposes. Standards were prepared at low, medium and high count levels from fresh herd milks containing somatic cells near levels of 100,000, 500,000 and 1,000,000/ml.

Determination of added water and bovine milk to caprine milk.

Increased production of commercial goat milk in Ontario stimulated an investigation to determine a base freezing point for goat milk for quantifying added water. A method also was developed for detection and estimation of degree of adulteration of goat milk with bovine milk. The mean freezing point based on 228 fresh herd samples of goat milk taken over 1 yr was -.