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The characterisation and measurement of Hbr‐reacting acids in Mucuna pruriens and Urena lobata seed oils
Author(s) -
Ahmad Moghis U.,
Husain Syed K.,
Osman Sheikh M.
Publication year - 1978
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740290412
Subject(s) - mucuna pruriens , chemistry , saponification , chromatography , organic chemistry , botany , biology
Seed oils of Mucuna pruriens (Leguminosae) and Urena lobata (Malvaceae) were found to contain HBr‐reacting acids to the extent of 1.3 and 10.8% respectively. Acetylation of the M. pruriens seed oil, followed by saponification and separation of the acids, gave 12,13‐dihydroxyoleic acid. From this and other evidence it is concluded that 12,13‐epoxyoleic (vernolic) acid is present as a constituent of the glycerides. On the other hand, the cyclopropenoid material in U. lobata oil was characterised as a mixture of malvalic (4.8%) and sterculic (6%) acids by the gas‐liquid chromatography (g.l.c.) of the silver nitrate‐methanol treated methyl esters. Seed oils of Vernonia anthelmintica and Sterculia foetida were used as reference standards.