Cholesteryl laurate

Kamm el al. (2001) analysed intact steryl esters in the presence of silylated sterols by online transfer from HPLC to a 15 m low-polarity high temperature GC column. Steryl esters were quantified against a cholesteryl laurate internal standard and identified by offline thin layer chromatography-gas chromatography-mass spectrometry. When esters of sitosterol, stigmasterol and campesterol with the major cocoa butter acids were measured in cocoa butters from South America, Asia and Africa, no differences were apparent between cocoa butters of different geographical origin, or between deodorized and non-deodorized butters. 

Positive Cotton effects (c.d.) are reported for both 3a- and 3/8-trimethylstannyl-5a-cholestanes, at 203 nm and 210 nm, respectively.35 The compounds were studied in connection with an evaluation of the effects of /3 -trimethylstannyl substituents in cyclohexanone analogues, which provide evidence of through-bond coupling to augment that already recognized for electronegative substituents.36 The circular dichroism associated with the enone systems of cholest-4-en-3-one and 3/3-acetoxycholest-5-en-7-one has been recorded for samples oriented by an electrical field in a nematic phase composed of cholesteryl chloride and cholesteryl laurate.37 New rules are proposed for the correlation of D-Iine molecular rotations with structures of steroid derivatives.38 This work extends an earlier analysis39 and in the present case relates mainly to data for substituents at C-3, C-5, and C-6. 

Figure 10. (b) Esr-spectrum of naphthalene in an oriented glass (a compensated nematic mixture of cholesteryl chloride and cholesteryl laurate) taken at 77K. 

Figure 14. (a) Absorption polarization spectrum of pyrene-2-carbonic methyl ester (PCME). Solvent 1.85 1 by weight mixture of cholesteryl chloride and cholesteryl laurate 30°C). Concentrations lO M and 3.3. 10 M, respectively. The spectrum PIIE was taken with the linear polarizers P oriented parallel to the electric field E (or parallel to the optix axis L). 

Figure 16. Relationship between the average orientations, of the z-axes of some aromatic solute molecules and their principal polarizabilities Oix x - Solid curve Theoretical relation calculated from Equ. (30) for Q = 0.115 kT. Dots ( ) experimental values of 8 2 as observed in a compensated nematic, 1.8 1 by weight mixture of cholesteryl chloride and cholesteryl laurate for 30° C.

Figure 25. Inverse of selective reflection maxima (o=p) as a function of composition for a number of binary chiral nematic mixtures. Here the components are O cholesteryl formate/cholesteryl chloride (at 50 °C), A cholesteryl propionate/cholesteryl chloride (at60°C), cholesteryl heptanoate/cholesteryl chloride (at 60 °C), A cholesteryl laurate/cholesteryl chloride (at 60°C) [105],...

The anaesthetic steroid 3a-hydroxy-5a-pregnane-ll,20-dione has normal conformational features, both in the crystal and in solution. X-Ray data show that deoxycholic acid can form an inclusion complex in which alternate molecules of dimethyl sulphoxide and water are held in canals formed by helically arranged host molecules.Six different crystalline forms of 17a-ethynyloestradiol have been recognized. X-Ray structural data are reported for 3-methoxy-2-aza-oestra-l,3,5(10)-trien-17/3-yl acetate, 3/3-hydroxypregn-5-en-20-one (pregnenolone), 5a-cholest-2-ene, 3/3-bromo- and 3/3-chloro-cholest-5-enes, and cholesteryl acetate (at 123 K), benzoate, chloroformate, ° laurate, methyl carbonate, and 24-norcholesteryl acetate. ... 

Fig. 11.6.1. HPLC separation of cholesterol and cholesteryl ester standards. Chromatographic conditions column, Supelcosil LC-18 (250x4.6 mm I.D.) mobile phase, acetonitrile-methanol-chloroform (1 1 1, v/v/v) flow rate, 1.0 ml/min temperature, ambient detection, differential refractometer. Peaks 1, cholesterol, 2, acetate 3, propionate 4, butyrate 5, nonanoate 6, decanoate 7, arachidonate 8, laurate 9, linoleate 10, oleate 11, elaidate 12, palmitate 13, stearate. The average mass of lipid chromatographed was 20-40 ng. Reproduced from Perkins et al. (1981), with...

A discontinuity in the thermodynamic properties and phase behaviour of the cholesteryl n-alkanoates between Cg and Cg is matched by a distinct difference between the crystal structures of the octanoate and nonanoate. The nonanoate chains pack with cholesteryl ring systems rather than with each other, the molecules lying antiparallel. The decanoate, undecanoate, and laurate (dodecanoate) show very similar crystal structures to the nonanoate. X-Ray data are also reported for a series of polymerizable liquid-crystalline cholesteryl esters,and for petrosterol p-bromobenzoate, which is shown to have the structure (5), and not the side-chain (6) as reported in 1978. 

Apricot (Prunus armeniaca) kernel oil Argan (Argania spinosa) kernel oil Behenamidopropyl dimethylamine Behentrimonium chloride Benzyl laurate Butyl octyl benzoate Camellia sinensis oil Castor oil phosphate Cetearyl isononanoate Cholesteryl/behenyl/octyidodecyl lauroyl glutamate... 

Cellulose Cerotic acid Ceteareth-20 Cetearyl alcohol Cetyl alcohol Cetyl laurate Chalk Cholesteryl hydroxystearate Cocamide Cocamide MIPA Copal resin Corn (Zea mays) starch Cyclocarboxypropyloleic acid Cyclomethicone 7-Dehydrocholesterol Dibenzylidene sorbitol Diglyceryl stearate malate Dihydroabietyl methacrylate Dihydrogenated tallow benzylmonium hectorite Dimethyl lauramine oleate Dipotassium azelate Dipropylene glycol salicylate Disodium lauroamphodiacetate ... 

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