Distribution of fatty acids in internal and external positions of triacylglycerols in 2 cyclopropanoid oils : litchi and longan.
Cargando...
Fecha
Autores
Título de la revista
ISSN de la revista
Título del volumen
Editor
DOI
Resumen
Descripción
Triacylglycerols in Litchi sinensis [L. chinensis] and longan (Euphoria longana [Dimocarpus longan]) seed oils are characterized by cyclopropanoic fatty acids: cis-9,10-methyleneoctadecanoic acid or dihydrosterculic acid constitutes 38.0% of total fatty acids in litchi and 17.4% in longan, whereas cis-7,8-methylenehexadecanoic acid only constitutes 5.5% and 1.0%, respectively. Triacylglycerols of these 2 oils underwent enzymatic hydrolysis with porcine pancreatic lipase or chemical degradation withethyl magnesium bromide, a reagent without chain specificity or regioselectivity. An unequal distribution of cis-7,8-methylenehexadecanoic and cis-9,10-methyleneoctadecanoic acids was found. The former was found in the sn-2 position at 84% in litchi triacylglycerols and at 100% in longan triacylglycerols, while the latter was located in external positions at 88% and 92%, respectively. Comparison of results from the 2 methods confirmed the impossibility of using the results obtained from enzymatic hydrolysis to determine the internal and external distribution of fatty acids in triacylglycerols containing cyclopropanoic fatty acids.
Triacylglycerols in Litchi sinensis [L. chinensis] and longan (Euphoria longana [Dimocarpus longan]) seed oils are characterized by cyclopropanoic fatty acids: cis-9,10-methyleneoctadecanoic acid or dihydrosterculic acid constitutes 38.0% of total fatty acids in litchi and 17.4% in longan, whereas cis-7,8-methylenehexadecanoic acid only constitutes 5.5% and 1.0%, respectively. Triacylglycerols of these 2 oils underwent enzymatic hydrolysis with porcine pancreatic lipase or chemical degradation withethyl magnesium bromide, a reagent without chain specificity or regioselectivity. An unequal distribution of cis-7,8-methylenehexadecanoic and cis-9,10-methyleneoctadecanoic acids was found. The former was found in the sn-2 position at 84% in litchi triacylglycerols and at 100% in longan triacylglycerols, while the latter was located in external positions at 88% and 92%, respectively. Comparison of results from the 2 methods confirmed the impossibility of using the results obtained from enzymatic hydrolysis to determine the internal and external distribution of fatty acids in triacylglycerols containing cyclopropanoic fatty acids.
Triacylglycerols in Litchi sinensis [L. chinensis] and longan (Euphoria longana [Dimocarpus longan]) seed oils are characterized by cyclopropanoic fatty acids: cis-9,10-methyleneoctadecanoic acid or dihydrosterculic acid constitutes 38.0% of total fatty acids in litchi and 17.4% in longan, whereas cis-7,8-methylenehexadecanoic acid only constitutes 5.5% and 1.0%, respectively. Triacylglycerols of these 2 oils underwent enzymatic hydrolysis with porcine pancreatic lipase or chemical degradation withethyl magnesium bromide, a reagent without chain specificity or regioselectivity. An unequal distribution of cis-7,8-methylenehexadecanoic and cis-9,10-methyleneoctadecanoic acids was found. The former was found in the sn-2 position at 84% in litchi triacylglycerols and at 100% in longan triacylglycerols, while the latter was located in external positions at 88% and 92%, respectively. Comparison of results from the 2 methods confirmed the impossibility of using the results obtained from enzymatic hydrolysis to determine the internal and external distribution of fatty acids in triacylglycerols containing cyclopropanoic fatty acids.
Palabras clave
enzymes, fatty acids, fatty oils, fruit crops, hydrolysis, longans, methodology, position, seed oils, seeds, subtropical fruits, triacylglycerols, Enzymes, Enzymes, Fatty acids, Hydrolysis, Methodology, Methodology, Seeds, Seeds, Tropical fruit