Effect of Different Esterification Methods on the Type andContent of Octadecatrienoic Acid in Trichosanthes Kirilowii Maxim Seed Oil
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Abstract:
Trichosanthes kirilowii Maxim. seed oil extracted by Soxhletex traction were used as material. The acid value, iodine value and saponification value were analyzed. Trichosanthes kirilowii Maxim seed oil were esterified by acid catalyst, alkali catalyst and BF3 catalyst.The differences in type and content between the different kinds of octadecatrienoic acid were studied via gas chromatography-mass spectrometry (GC-MS). The results showed that the acid value, the iodine value and the saponification value were 0.51 mg KOH/g, 1.3398 g I2/g and 1.9143 g KOH/g. 5 octadecatrienoic acids were identified by acid-catalyzed esterification method, being of punicic acid (6.43%),catalpa acid (9.5%), α-eleostearic acid (7%), γ-linolenic acid (5.82%), and α-linolenic acid (1.52%). 4 octadecatrienoic acids were identified by alkali-catalyzed esterification method and BF3- catalyzed esterification method, being of punicic acid (31.24% and 27.17%), α-eleostearic acid (3.33% and 3.56%), catalpa acid (1.23% and 2.02%) and α - linolenic (0.38% and 0.78%). The quality indexes of the Trichosanthes kirilowii Maxim. seed oil met the national standards and it could be popularized. Alkali-catalyze esterification method was the most suitable method for Trichosanthes kirilowii Maxim. seed oil because of the minimum isomerization.
