The volatile acids of mutton fat

The volatile fatty acids of bovine-muscle and -liver phospholipids

“…In the present work, as well as in several recent studies, e.g. on blood lipids (Annison, 1954) and depot fat (McInnes et al 1956), an appreciable proportion of the volatile fatty acids is formic acid (28.7 moles % and 24-7 moles % in liver and muscle, respectively).…”

“…The development of a suitable micro-analytical technique for determining volatile fatty acids (James & Martin, 1952) has made possible the detection of smaller amounts of these acids in lipids from other sources, and it has already been shown that acetic and propionic acids are present in the glyceride fat of liver [James & Popjdk, unpublished observations quoted by Popjak (1952)]. A consecutive series of volatile fatty acids from C2 to C0O has been found in ox perinephric fat (Hansen & McInnes, 1954), and with analyses of mutton fat this series has been extended to include formic, isobutyric, isovaleric and a-methylbutyric acids (McInnes, Hansen & Jessop, 1956).…”

686. The fatty acids of butterfat and the volatile acids formed on oxidation

“…It has been long established that C 4 -C, 2 volatile fatty acids with an even number of carbon atoms normally occur to the extent of approximately 6 % by weight in the glycerides of milk fats(i). Recent studies, using gas-liquid ahromatography have shown that volatile fatty acids with an odd number of carbon atoms form part of the small amount of volatile fatty acid present in the glycerides of some animal fats (2,3,4). It would be reasonable to expect, therefore, that the same sensitive techniques would reveal the presence of these acids in butterfat, and the present experiments were carried out with this object.…”

The occurrence of n-heptadecanoic acid (margaric acid) in unhydrogenated mutton fat

“…was steam-rendered, saponified, and converted into fatty acids. The fatty acids were steam-distilled (see McInnes, Hansen & Jessop, 1956), and the steam-non-volatile acids (21-58 kg.) were converted into methyl esters (20-47 kg.)…”