Positional distribution of fatty acids in triglycerides from milk of several species of mammals |
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Authors: | Peter W Parodi |
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Affiliation: | (1) Fats Research Laboratory, The Butter Marketing Board, Hamilton Central, 4007 Queensland, Australia |
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Abstract: | Milk triglycerides from the echidna, koala, Tammar wallaby, guinea pig, dog, cat, Weddell seal, horse, pig and cow were subjected
to fatty acid and stereospecific analysis to determine the positional distribution of the fatty acids in the triglycerides.
The samples presented a wide range of fatty acids, most of which varied in content among species. The compositions of the
acids at the 3 positions also varied among species, reflecting the content of these acids in the triglycerides. However, there
was a general similarity in fatty acid positional distribution patterns for all the species with the exception of the echidna.
The echidna exhibited a completely different fatty acid positional distribution pattern. The saturated acids were preferentially
esterified at thesn-1-position whereas the unsaturated acids were selectively esterified at thesn-2-position. The triglyceride carbon number distribution of milk from the above species (with the exception of the Weddell
seal) was determined by gas liquid chromatography and compared to that predicted by the 1-random-2-random-3-random fatty acid
distribution hypothesis. Agreement was excellent between observed and predicted composition for echidna, koala, Tammar wallaby,
guinea pig and pig milk, and agreement was reasonable for dog, cat, horse and cow milk. Results are discussed in relation
to biochemical mechanisms. |
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