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151114
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Qingjia Bao et al.
Journal of magnetic resonance (San Diego, Calif. : 1997), 234, 82-89 (2013-07-16)
A robust automatic phase correction method for Nuclear Magnetic Resonance (NMR) spectra is presented. In this work, a new strategy combining 'coarse tuning' with 'fine tuning' is introduced to correct various spectra accurately. In the 'coarse tuning' procedure, a new
H P Weber et al.
Acta crystallographica. Section B, Structural science, 47 ( Pt 1), 116-127 (1991-02-01)
Cholesteryl acetate (C29H48O2) at 20 K is monoclinic, space group P2(1) with a = 16,521 (4), b = 9,220 (2), c = 17,620 (5) A, beta = 107.18 (2) degrees and Z = 4 (two molecules in the asymmetric unit).
High-resolution NMR spectroscopy in solids by truly magic-angle spinning.
Sasa Antonijevic et al.
Angewandte Chemie (International ed. in English), 44(19), 2935-2938 (2005-04-09)
Allylic nitration of 3 beta-sitosterol and cholesterol acetate: preparation of 7-nitro derivatives.
M Jiménez-Estrada et al.
Steroids, 62(6), 500-503 (1997-06-01)
Elena Bonzón-Kulichenko et al.
Endocrinology, 150(1), 169-178 (2008-09-20)
Obesity and type 2 diabetes are associated with insulin and leptin resistance, and increased ceramide contents in target tissues. Because the adipose tissue has become a central focus in these diseases, and leptin-induced increases in insulin sensitivity may be related
A Zanoun et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 62(1-3), 547-551 (2005-08-16)
Structural and vibrational properties of the CO stretching bond of cholesteryl acetate and related steroids are investigated theoretically and by Micro-Raman spectroscopy. In this work, an analysis of the CO stretching mode for the cholesteryl acetate is presented. Experimental results
Vineet Choudhary et al.
Proceedings of the National Academy of Sciences of the United States of America, 109(42), 16882-16887 (2012-10-03)
Sterols and related membrane-perturbing agents are subject to a quality control cycle. Compounds that fail to pass this control are acetylated and secreted into the culture media, whereas lipids that pass the cycle are deacetylated and retained within the cell.
W Kaminsky et al.
Journal of microscopy, 228(Pt 2), 153-164 (2007-11-01)
A polarized light imaging technique is introduced that simultaneously captures and unfolds transmittance, fast/slow axes directions and birefringence or linear dichroism from single camera exposures. The technique, based on the rotating polarizer method, is capable of sampling an object through
Ana Paula D M Espindola et al.
Journal of the American Chemical Society, 131(44), 15994-15995 (2009-10-23)
A new technique to deconvolute complex (1)H NMR spectra of small molecules has been developed that utilizes shape selective pulses to simultaneously decouple multiple protons. A limitation in the assignment of the relative configuration of small molecules is the ability
I Gvozdovskyy et al.
The European physical journal. E, Soft matter, 24(3), 211-215 (2007-12-07)
Detailed studies are reported of the Lehmann-type effect of rotation of small single crystals of chiral substances during their dissolution at the top of a nematic droplet, which was first noted in our previous works. The rotation effect is shown
N Nicolaides et al.
Investigative ophthalmology & visual science, 29(3), 482-486 (1988-03-01)
The tissue contents of chalazia taken from five individuals were extracted for lipids and analyzed by TLC and GLC. Lipids found were sterol esters 9%, wax esters 0%, triacyl glycerols 4%, free cholesterol 11%, free fatty acids 2%, unidentified nonpolar
André J Simpson et al.
Analytical chemistry, 80(1), 186-194 (2007-12-07)
A general technique is described that permits the extraction of a complete 1H NMR spectrum for components in organosoluble mixtures. The approach should find a wide range of applications considering that pure component spectra can be generated without the need
R Bortolomeazzi et al.
Journal of chromatography. A, 683(1), 75-85 (1994-10-14)
The polar products separated by solid-phase extraction from the peroxidation mixture of cholesteryl acetate, were investigated. The oxidation products were identified by comparing GC retention times as well as the mass spectra against those of available or synthesized standards. The
Chirality in liquid crystals
Goodby, J. W.
Journal of Materials Chemistry, 1(3), 307-318 (1991)
M Pelillo et al.
Rapid communications in mass spectrometry : RCM, 14(14), 1275-1279 (2000-08-05)
In this work, electron-impact mass spectroscopy (EI-MS) was employed on a wide range of sterol compounds in order to study their behaviour with regard to their functional groups. In particular, some specific mechanisms of fragmentation occurring in these substrates (i.e.
Harshica Fernando et al.
Toxicology and applied pharmacology, 264(3), 361-369 (2012-08-14)
Chronic alcohol abuse is a 2nd major cause of liver disease resulting in significant morbidity and mortality. Alcoholic liver disease (ALD) is characterized by a wide spectrum of pathologies starting from fat accumulation (steatosis) in early reversible stage to inflammation
Dmitry A Aleksandrov et al.
The FEBS journal, 273(3), 548-557 (2006-01-20)
5-Lipoxygenase (5-LO) is the key enzyme in the biosynthesis of leukotrienes (LTs), biological mediators of host defense reactions and of inflammatory diseases. While the role of membrane binding in the regulation of 5-LO activity is well established, the effects of
Transverse dephasing optimised NMR spectroscopy in solids: natural-abundance 13C correlation spectra.
Gaël De Paëpe et al.
Chemphyschem : a European journal of chemical physics and physical chemistry, 5(6), 869-875 (2004-07-16)
Francesco P Ballistreri et al.
Steroids, 71(7), 565-577 (2006-03-30)
We have investigated the oxidative behavior of sterols such as cholesteryl acetate (1), 7-dehydrocholesteryl acetate (2), ergosteryl acetate (3), cholecalciferol acetate (Vitamin D(3) acetate) (4) and ergocalciferol acetate (Vitamin D(2) acetate) (5) with the oxidant system methyltrioxorhenium/H(2)O(2)/pyridine in order to
H Rapaport et al.
Biophysical journal, 81(5), 2729-2736 (2001-10-19)
The growth of a cholesterol crystalline phase, three molecular layers thick at the air-water interface, was monitored by grazing incidence x-ray diffraction and x-ray reflectivity. Upon compression, a cholesterol film transforms from a monolayer of trigonal symmetry and low crystallinity
D Blache et al.
Biochimica et biophysica acta, 1259(3), 291-296 (1995-12-07)
Although the exact function of cholesteryl sulfate (CS) is unknown, it is present in low concentration in lipoproteins, in red blood cells and spermatozoa. In the present study, we investigated whether CS is present in blood platelets and its possible
P J Dolphin et al.
Atherosclerosis, 51(1), 109-122 (1984-04-01)
The levels of apolipoproteins B, E and A-1 and the molecular species of triacylglycerols, phospholipids and cholesteryl esters were individually quantitated by electroimmunoassay and gas chromatographic total lipid profiling in 50 fresh samples of umbilical cord sera obtained from full
P Ghosh et al.
Lipids, 32(9), 1011-1014 (1997-10-06)
Most work reporting the sterol composition of living organisms has not been done quantitatively, although good quantitative data are available for fatty acids and many other cellular components using an internal-standard method that compensates for errors during gas chromatographic analysis.
Magdalena M Domon et al.
Journal of colloid and interface science, 346(2), 436-441 (2010-04-07)
Annexin A6 (AnxA6), a calcium- and membrane-binding protein, is well-known to play a role in calcium homeostasis, membrane traffic and membrane organization. It had been suggested that, despite calcium-dependent interaction with anionic phospholipids, AnxA6 displays calcium-independent cholesterol binding properties. In
B Sjöström et al.
Pharmaceutical research, 12(1), 39-48 (1995-01-01)
Hydrophobic substances were dissolved in an organic solvent and emulsified with an aqueous solution at very high shear. Droplets of very small sizes (50-100 nm) were obtained by using surfactants which were combinations of lecithins and bile salts. After emulsification
E G Perkins et al.
Lipids, 16(8), 609-613 (1981-08-01)
Cholesterol and cholesteryl esters were separated according to their carbon number and number of double bonds by high performance reversed-phase chromatography (HPRC) using acetonitrile/chloroform/methanol (1:1:1, v/v) as a mobile phase. It was found that within the same equivalent carbon number
B Sjöström et al.
Journal of pharmaceutical sciences, 82(6), 579-583 (1993-06-01)
A method for the synthesis of small particles of poorly water-soluble drug substances with emulsions is presented. The drug is dissolved in an organic solvent and a water-soluble surfactant is dissolved in water. These two solutions are mixed to form
B Sjöström et al.
Journal of pharmaceutical sciences, 82(6), 584-589 (1993-06-01)
Small particles of two steroids, cholesteryl acetate and beta-sitosterol, were prepared by the following technique. The steroid was dissolved in an organic solvent, which was emulsified in water in the presence of surfactant, thus giving a water-continuous emulsion. As the
Weigang Lu et al.
Steroids, 69(13-14), 803-808 (2004-12-08)
This paper describes the efficient and stereospecific synthesis of cytotoxic dihydroxylated sterols, 24-methylene-cholest-5-ene-3beta,7alpha-diol 1, and its C-7 epimer, 24-methylene-cholest-5-ene-3beta,7beta-diol 2. The crux of the synthesis is that the selective allylic oxidation of 24-methylene-cholesteryl acetate proceeds to 24-methylene-7-keto-cholesteryl acetate without extensive
Anna P Gardymova et al.
Molecules (Basel, Switzerland), 25(7) (2020-04-16)
Cholesteric droplets dispersed in polymer with conical boundary conditions have been studied. The director configurations are identified by the polarising microscopy technique. The axisymmetric twisted axial-bipolar configuration with the surface circular defect at the droplet's equator is formed at the
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