In 1964, a method was described for the determination of free fatty acids (FFAs) in vegetable oil. This paper describes an expansion of that work, improving the sensitivity and reproducibility of the method, as well as examination of solubilities of the copper soaps as a function of chain length and unsaturation. Involvement of the micellar structure was reviewed. Finally, a procedure is described that permits very rapid determination of FFA at the 2.0-14.0/~mol (0.5-4.0 mg oleic acid) level, and the results with several oils are given. Particular attention was given to evaluation of solvent systems which would extract the copper complexes.

A method is described for quantitatively determining lipid phosphorus with a linear range from 0.7–10.0 μg. The method is simple and rapid, requiring one stable reagent and a single extraction with 1‐butyl acetate after the phosphorus is converted to inorganic phosphate by means of a perchlorate digestion. The stable complex is read at 310 nm.

No abstract

It has been demonstrated that the three most important factors which determine the rate of breakdown of pelargonidin-3-glucoside, the major anthocyanin of strawberries, are pH, temperature and the presence of oxygen (6,9). Ascorbic acid has a marked effect and sugars also contribute to the breakdown of this pigment (9).Since sugars are present at such high concentration in many strawberry products and since there is a variety of sugars available for use in the preparation of these products, it was considered advantageous to study the effects of sugars on the rate of pigment breakdown. Meschter (9) has observed the rate of strawberry pigment degradation in the presence of different sugars at 38" C. Sugars such as arabinose, levulose and sorbose, which are relatively labile, produced a higher rate of pigment degradation than the more stable sugar maltose and the sugar alcohol sorbitol. The sugar degradation

Dissipation at rates approaching those in warmer climates offer a hypothesis that microflora native to high latitudes may be adapted to destruction of such molecules at lower temperatures than may be indicated by experiments with microflora adapted to warmer climates. Residues pose no observable risk to wildlife or humans in the area of use when products are applied properly.