Positional distribution of fatty acids in triglycerides of animal depot fats

Brockerhoff, H.; Hoyle, R. J.; Wolmark, N.

doi:10.1016/0005-2760(66)90092-0

Cited by 142 publications

(47 citation statements)

References 10 publications

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“…On the other hand, since our lipase assay could not differentiate between the two primary positions in the triacylglycerol, the possibility of an asymmetrical fatty acid distribution should be considered. In the depot fat of the mealworm Tenebrio monitor, Brockerhoff et al [29] observed an asymmetrical triacylglycerol fatty acid distribution, in which for instance 14 : 0 and 16 : 0 tend to prefer positions 1 to 3, whereas 16 : 1 and 18 : 1 tend toward position 3. Assuming that similar differences exist in Locusta, a specific SW3 lipase would account completely for the observed differences in the average of the positions 1 and 3 of the triacylglycerols and the sn-1 position of the diacylglycerols.…”

Section: Discussionmentioning

confidence: 99%

Chiral 1,2-diacylglycerols in the haemolymph of the locust, Locusta migratoria

Lok

Horst

1980

Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metaboli

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SummaryA 'H-NMR method using chiral shift reagents was applied in the stereochemical analysis of the haemolymph 1,2-diacylglycerols of Locusta migratoria. Conversion of the 1,2diacylglycerols into 1,2-diacetyl-3-tritylglycerols allowed the accurate determination of the enantiomeric purity, whereas direct trimethylsilylation of the unmodified or hydrogenated haemolymph 1,2-diacylglycerols proved to be less suitable because of signal broadening.In the haemolymph of Locusta, sn-1,2-diacylglycerols with a remarkably high optical purity were found to be present. In the resting locust, at least 96% of the haemolymph 1,2diacylglycerols have the sn-1,2-configuration; in locusts in which the haemolymph diacylglycerol concentration was elevated by fat body triacylglycerol mobilization induced by flight activity or injection of adipokinetic hormone, over 97% of the 1,2diacylglycerols is the sn-1,2-enantiomer. The few percent sn-2,3-enantiomer may not have been present initially.Positional distribution of the fatty acids in the fat body triacylglycerols and in the haemolymph sn-1,2-diacylglycerols obtained from locusts after a 2 h flight revealed nearly identical occupation of the sn-2-positions in both acylglycerols. The distribution patterns in the sn-l-position of the 1,2-diacylglycerols and the combined sn-1 and sn-3 positions of the triacylglycerols are compatible with the possible existence of a stereospecific sn-3-triacylglycerol lipase .

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Section: Discussionmentioning

confidence: 99%

Chiral 1,2-diacylglycerols in the haemolymph of the locust, Locusta migratoria

Lok

Horst

1980

Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metaboli

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“…For instance, in MF, C18:0 is selectively esterified at the sn-1 position, myristic acid C14:0 is preferentially located at the sn-2 position, and SCFAs are esterified almost exclusively at the sn-3 position 10 . Meanwhile, in BF, C16:0 tends to bind to the sn-1 position, cis-9-C18:1 is selectively located at the sn-2 position, and C18:0 is preferentially esterified at the sn-3 position 30 . In the present study, we observed the same fatty acid distribution pattern, although our analytical method is not capable of distinguishing the difference between the sn-1 and 3 positions.…”

Section: Regiospeci C Distribution Of Fatty Acids In Edible Fatsmentioning

confidence: 99%

Regiospecific Distribution of <i>trans</i>-Octadecenoic Acid Positional Isomers in Triacylglycerols of Partially Hydrogenated Vegetable Oil and Ruminant Fat

et al. 2015

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“…25,85 A banha é rica nos ácidos palmítico e oléico, na proporção aproximada de 1:2, que correspondem a cerca de 75% de seus ácidos graxos. Devido à predominância do ácido palmítico na posição sn-2, os principais triacilgliceróis da banha são StPO, OPL e OPO (onde St = esteárico, P = palmítico, O = oléico e L = linoléico).…”

Section: Lipídios Estruturados -Sucedâneos Dos Lipídios Do Leite Humanounclassified

Lipídios estruturados: alternativa para a produção de sucedâneos da gordura do leite humano

Silva¹,

Gioielli²

2009

Quím. Nova

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Recebido em 12/2/08; aceito em 9/12/08; publicado na web em 7/5/09 STRUCTURED LIPIDS: ALTERNATIVES FOR THE PRODUCTION OF HUMAN MILK FAT SUBSTITUTES. Human milk has characteristics of great importance for the newborn. Its composition shows all nutrients in quantity and quality needed, in addition to providing protection against infections and allergies and stimulating the immune system. Therefore, the composition of fatty acids and their distribution in the triacylglycerols are targets of studies on infant formula, and the triacylglycerols of human milk fat should serve as a model for the lipid components. This review aims to report studies of technology in lipids in order to produce structured lipids as substitutes of human milk fat.Keywords: structured lipids; human milk fat; interesterification. INTRODUÇÃOSob os pontos de vista nutricional, imunológico e de segurança, o leite humano é considerado o melhor alimento para crianças na primeira fase de sua vida. 1 O leite humano mantém o crescimento e desenvolvimento normais, melhora o processo gastrointestinal, favorece o vínculo mãe-filho 2 e facilita os desenvolvimentos emocional, cognitivo e do sistema nervoso. [3][4][5] O leite materno é um líquido rico em gordura, minerais, vitaminas, enzimas e imunoglobulinas que protegem contra doenças. Apesar de o leite maduro ser formado por cerca de 87% de água, os restantes 13% são uma poderosa combinação de elementos, fundamentais para o crescimento e desenvolvimento da criança.A secreção láctea apresenta as seguintes fases: colostro -é a secreção apresentada até 5 dias após o parto, contém o mais alto teor de proteínas, principalmente imunoglobulinas e lactoferrina. Seu conteúdo de gordura (2%) é inferior ao do leite maduro (3,5%); leite transicional -é a secreção entre o 6º e o 15º dia após o parto. A imunoglobulina diminui, enquanto a lactose, gordura e vitaminas hidrossolúveis aumentam. É a fase mais variável entre as lactantes; leite maduro -é produzido após o 15º dia de lactação e, comparado ao colostro é uma secreção mais fina e aquosa. O leite inicial da mamada é mais fino e aquoso, pois, tem a função de suprir a sede e as necessidades líquidas do bebê, enquanto o leite do final da mamada tem quatro vezes mais gordura que o leite inicial, com a função de fornecer calorias ao lactente. 6 As proteínas do leite humano são estrutural e qualitativamente diferentes das do leite bovino. Do conteúdo protéico do leite humano, 80% são constituídos pela lactoalbumina, enquanto que no leite de vaca a caseína corresponde a aproximadamente 80%. Desse modo, a relação proteínas do soro/caseína do leite humano é aproximadamente 80/20, enquanto a do leite bovino é 20/80. A baixa concentração de caseína no leite humano resulta na formação de coalho gástrico mais leve, com flóculos de mais fácil digestão e com reduzido tempo de esvaziamento gástrico. 7 O leite humano contém, também, diferentemente do leite de vaca, maiores concentrações de aminoácidos essenciais de alto valor biológico (cistina e taurina) que são fundamentais para...

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Positional distribution of fatty acids in triglycerides of animal depot fats

Cited by 142 publications

References 10 publications

Chiral 1,2-diacylglycerols in the haemolymph of the locust, Locusta migratoria

Chiral 1,2-diacylglycerols in the haemolymph of the locust, Locusta migratoria

Regiospecific Distribution of <i>trans</i>-Octadecenoic Acid Positional Isomers in Triacylglycerols of Partially Hydrogenated Vegetable Oil and Ruminant Fat

Lipídios estruturados: alternativa para a produção de sucedâneos da gordura do leite humano

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