A new spectroscopic phenomenon in fatty acid metabolism. The conversion of “pro-absorptive” to “absorptive” acids in the cow

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Abstract
Certain fatty acids, called from this phenomenon "proabsorptive" acids, are converted into "absorptive" acids by prolonged boiling with alcoholic potash, also, in vivo, on being converted into butter acids in the cow. "Absorption" designates the extinction coefficient at the head of an absorption band at 230 m[mu]. The acids showing this phenomenon were the mixed acids prepared from cod-liver oil, sardine oil, rape oil, and linseed oil. The rise in the absorptive power of the butter fatty acids on the feeding of proabsorptive acids was rapid and in some cases amounted to a 4-5 fold increase. The cause of the increase of absorptive power is not oxidative and is probably some intramolecular change.

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