Lecithins
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Physicochemical properties of lecithin-based nanoemulsions obtained by spontaneous emulsification or high-pressure homogenization
Nanoemulsions composed of a medium-chain triglyceride oil core stabilized by rapeseed or sunflower lecithins were prepared by spontaneous emulsification and high-pressure homogenization. These nanoemulsions are compared with formulations stabilized by egg lecithin. Nanoemulsions obtained by high-pressure homogenization display larger droplet size (230 to 440
Quím. Nova. Publicado em: 2014
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2. Caracterização de lecitinas comerciais por espectrometria de massas ambiente com ionização sonic-spray / Characterization of commercial lecithins by easy ambient sonic-spray ionization mass spectrometry
Os fosfolipídios são definidos como o grupo de moléculas que contém um grupamento fosfato. Por apresentarem características anfipáticas, este grupo de moléculas se organiza naturalmente em bicamadas, originando as membranas dos seres vivos. Industrialmente são capazes de estabelecer interfaces óleo/água, possibilitando a formação e estabilizaçã
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/04/2012
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3. Soybean oil processing using ultrafiltration in micelle in the degumming step / Processamento de oleo de soja utilizando ultrafiltração em miscela na etapa de degomagem e na obtenção de lecitina
Crude soybean oil is traditionally degummed by water addition or phosphoric acid. The membrane technology applied to vegetable oils processing has become important because it allows to use temperatures, reduces waste water treatment, retains undesirable products, besides preserving important minor compounds in the oil. The objectives of this work were to opt
Publicado em: 2004
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4. Synthesis of Dipalmitoyl Lecithin by Alveolar Macrophages
A reliable, relatively simple method for isolation and quantification of disaturated lecithins is described. In rabbit lung, 34% of the lecithins were disaturated, in alveolar macrophages, 19%. More than 95% of the fatty acids of the disaturated lecithins from lung and alveolar macrophages was palmitic. Hence, the disaturated lecithins from these sources wer
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5. Utilization of individual lecithins in intestinal lipoprotein formation in the rat.
To determine the molecular species composition of lecithins of different nascent lipoproteins, high density lipoproteins (HDL), very low density lipoproteins (VLDL), and chylomicrons (CM) were isolated from the mesenteric lymph of rats. Lymph was collected at 0 degrees C with 5,5'-dithiobis-2-dinitrobenzoic acid added to inhibit lecithin-cholesterol acyl tra
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6. Lecithin Changes in Murine Mycoplasma pulmonis Respiratory Infection
We examined the lipid content of bronchoalveolar (BA) washes from both mice and rats infected with Mycoplasma pulmonis, an etiological agent of murine pneumonia. During a 30-day period after intranasal inoculation, the total lipid content from infected and control rats (in milligrams per animal) remained relatively equal and unchanged. The saturated, unsatur
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7. Saturated Synthetic Lecithins in Vdrl and Kolmer Antigens for the Sero-Diagnosis of Syphilis*
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8. Synthetic L-α-Dioleyl Lecithin in Antigens for the Sero-diagnosis of Syphilis: Comparison with other Lecithins*†
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9. Relationship of phospholipid chemistry to serological reactivity in the Venereal Disease Research Laboratory slide test antigen.
A total of 13 egg lecithins, 12 beef heart lecithins, and 15 beef heart cardiolipins were assayed for the ability to function in the Venereal Disease Research Laboratory microflocculation test, as well as for purity, fatty acid composition, free amines, metals, and products of oxidation. We found that the presence of peroxides and oxidation-related ultraviol
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10. Trans-unsaturated lipid dynamics: modulation of dielaidoylphosphatidylcholine acyl chain motion by ethanol.
Acyl chain dynamics of the trans-unsaturated lipid, dielaidoylphosphatidylcholine (DEPC), were studied by conventional and saturation transfer electron paramagnetic resonance spectroscopy of aqueous dispersions of DEPC spin labeled with lecithins having doxyl groups at positions 5, 10, and 14 on the sn-2 chain. The gel to liquid crystalline transition is con
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11. Structure of gel phase saturated lecithin bilayers: temperature and chain length dependence.
Systematic low-angle and wide-angle x-ray scattering studies have been performed on fully hydrated unoriented multilamamellar vesicles of saturated lecithins with even chain lengths N = 16, 18, 20, 22, and 24 as a function of temperature T in the normal gel (L beta') phase. For all N, the area per chain Ac increases linearly with T with an average slope dAc/
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12. Mechanism of secretion of biliary lipids. I. Role of bile canalicular and microsomal membranes in the synthesis and transport of biliary lecithin and cholesterol.
The role of bile canalicular and microsomal membranes in the synthesis and transport of biliary lipids was investigated by using the isolated perfused rat liver model. Labeled lecithin precursors ((3H)-palmitic acid, (14C)linoleic acid, (3H)choline, and 32PO4) and a cholesterol precursor ((3H)mevalonic acid) were administered with and without sodium taurocho