Choline stearate

C5H15NO2 123-41-1) see Acetylcholine chloride Choline chloride Choline dihydrogen citrate Choline stearate choline naphthalene-1,5-disulfonate (C20H34N2O8S2) see Aclatonium napadisilate choline tosylate... 

Another factor affecting the lifetime of a membrane fluorophore probe is its proximity to the surface. The lifetimes of the DPH, DPH-phosphatidyl-choline (DPH-PC), and trimethylammonium-DPH (TMA-DPH) probes decrease in the order DPH > DPH-PC > TMA-DPH, as the probe locates nearer to the surface of the lipid bilayer.(7) The same is found for the anthroyl-stearate probes.(8) More recently, it has been shown that with TMA-DPH, the lifetime appears to be fairly sensitive to the differences in lipid bilayer packing induced by differing degrees of unsaturation in the phospholipid fatty acyl chains.(9) This aspect of the use of TMA-DPH and possibly other probes remains to be further exploited. 

When an alcoholic solution of lecithin is brought into contact-with hot solution of barium hydroxid it yields barium glycerophosphate, barium stearate, and cholin (see p. 276). This decomposition indicates the constitution of lecithin and its relations to the fats. Glycerophosphoric acid is phosphoric acid in which an atom of hydrogen has been replaced by the univalent i-emalnder CHaOH- CHOH—CHa—left by the removal of OH from, glycerol ... 

Ans. The palmitate and stearate units constitute the hydrophobic portions while the phosphate O" and choline centers constitute the hydrophilic portions. The hydrophobic-hydrophilic aspects of phosphoglyceride molecules are best represented by redrawing the molecule as in structure 1 below. The hydrophobic and hydrophilic portions repell each other and are directed away from each other. Structure II below is a schematic representation of such molecules. The spherical head and long wiggly tails represent the hydrophilic and hydrophobic portions, respectively. 

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