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OALib Journal期刊

ISSN: 2333-9721

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( 2013 )

( 1997 )

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匹配条件： “diacylglycerols” ，找到相关结果约3条。
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Process optimization using response surface design for diacylglycerol synthesis from palm fatty acid distillate by enzymatic esterification
Songsri Santisawadi,Siree Chaiseri,Nakanyapatthara Jinda,Utai Klinkesorn
Songklanakarin Journal of Science and Technology , 2013,
Abstract: Diacylglycerols (DAG) were synthesized by lipase-catalyzed esterification of glycerol with palm fatty acid distillate(PFAD). Lipase from Rhizomucor miehei was used and the reaction was carried out at 45°C. After 24 h, the reaction productswere sampled and the DAG content was determined using high performance thin layer chromatography. A response surfacemethodology (RSM) was used to study the effect of substrate molar ratio (0.75 to 2.25 mol), enzyme concentration (2.0 to 3.0wt%) and the amount of molecular sieve (25 to 35 wt%) on the DAG yield. An analysis of variance (ANOVA) showed that 84%(R2 = 0.84) of the observed variation was explained by the polynomial model. The optimum conditions obtained from theresponse surface analysis were 1.23 mol for the molar ratio between fatty acid distillate and glycerol, 31.1 wt% molecularsieve and 2.32 wt% enzyme. Alkaline neutralization of the esterification products yielded neutralization residues containingapproximately 70% DAG.
Worker honeybee hemolymph lipid composition and synodic lunar cycle periodicities
Brazilian Journal of Medical and Biological Research , 1997, DOI: 10.1590/S0100-879X1997000200018
Abstract: the aim of the present investigation was to extend a previous study, showing a correlation of the variations of hemolymph carbohydrates with synodic lunar-like cycle and its circaseptan harmonics to worker honeybee hemolymph lipids. hemolymph lipid concentrations of emerging worker imagos were analyzed in terms of one ideal synodic lunar cycle and processed by the cosinor method testing the null hypothesis versus the presence of 29.5-, 14.8- or 7.4-day periods in the data. a rhythmicity statistically compatible with a 29.5-day rhythm was observed for triacylglycerols and steroids as well as for body weight. a circadiseptan rhythm was determined for 1,3 diacylglycerols, while fatty acids and phospholipids exhibited a circaseptan rhythm. an agreement of peaks for triacylglycerols, steroids and body weight at the new moon, but not at the full moon, was noted with respect to trehalose and glucose circadiseptan rhythms. the latter moon-phase timing of peaks and nadirs, compared with that previously determined for trehalose and glucose, appeared to be identical to the circadiseptan rhythm and reciprocal for the circaseptan rhythms of 1,3 diacylglycerols. reciprocal tendencies in circaseptans of trehalose and glucose on the one hand, and fatty acids and phospholipids on the other are indicated. the underlying causal nexus of these relationships is unknown
Worker honeybee hemolymph lipid composition and synodic lunar cycle periodicities
Mikulecky M.,Bounias M.
Brazilian Journal of Medical and Biological Research , 1997,
Abstract: The aim of the present investigation was to extend a previous study, showing a correlation of the variations of hemolymph carbohydrates with synodic lunar-like cycle and its circaseptan harmonics to worker honeybee hemolymph lipids. Hemolymph lipid concentrations of emerging worker imagos were analyzed in terms of one ideal synodic lunar cycle and processed by the cosinor method testing the null hypothesis versus the presence of 29.5-, 14.8- or 7.4-day periods in the data. A rhythmicity statistically compatible with a 29.5-day rhythm was observed for triacylglycerols and steroids as well as for body weight. A circadiseptan rhythm was determined for 1,3 diacylglycerols, while fatty acids and phospholipids exhibited a circaseptan rhythm. An agreement of peaks for triacylglycerols, steroids and body weight at the new moon, but not at the full moon, was noted with respect to trehalose and glucose circadiseptan rhythms. The latter moon-phase timing of peaks and nadirs, compared with that previously determined for trehalose and glucose, appeared to be identical to the circadiseptan rhythm and reciprocal for the circaseptan rhythms of 1,3 diacylglycerols. Reciprocal tendencies in circaseptans of trehalose and glucose on the one hand, and fatty acids and phospholipids on the other are indicated. The underlying causal nexus of these relationships is unknown
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