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In a recent publication (1), studies of the concentration of unesterified fatty acid (UFA) in the blood of normal human subjects were reported. The relation of the concentration of unesterified fatty acid to the nutritional state of the subject, together with the observation of arteriovenous differences in unesterified fatty acid concentration, formed the basis for the belief that this lipid fraction constitutes a transport form of fatty acid which can account for the movement of fats from adipose tissue depots into tissues requiring fat as an energy-yielding substrate. Other studies were reported which served to indicate the existence of hormonal mechanisms controlling the concentration of circulating unesterified fatty acid. At the same time, there appeared another publication (2), representing independent investigations with a different analytical method, in which virtually identical observations were reported (with the exception that no studies of arteriovenous differences were included). In view of the potentially great physiologic significance of plasma unesterified fatty acid, it was decided that the above-mentioned studies should be confirmed and extended, and that another analytical procedure, more accurate and convenient than that used earlier, should be developed. The method employed by Dole (2), though extremely convenient and rapid, did not seem suitable for the investigation of arteriovenous differences, since lactate interferes appreciably with the results obtained by that method. The data reported in the present publication were obtained by a procedure which has the advantage of high specificity, although it is appreciably more laborious than the method of Dole.

UNESTERIFIED FATTY ACID IN HUMAN BLOOD PLASMA. II. THE TRANSPORT FUNCTION OF UNESTERIFIED FATTY ACID