BIOC 2580 Lecture Notes - Lecture 13: Glycerophospholipid, Lipid Bilayer, Phosphatidylethanolamine

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rosezebra99

26 Feb 2018

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Derivatives of fatty acids: carboxylic acids can combine with alcohols to form esters, carboxylic acids can combine with acids for form acid anhydrides. Phosphoric acid can react with alcohols and acids to form phosphate esters and phosphoanhydrides. Pc and pe are the major constituents of most membranes. 1: phosphatidylcholine (like all other glycerophospholipids) represents a class of lipids rather than single molecule, different combinations of fatty acids at position r1 and r2 correspond to different phosphatidylcholine molecules. Analysis of lipids: separated based on their polarity on a column of silica gel through tlc, progressively polar lipids elute from the column as solvents of increasing polarity are passed through it. Separated based on their polarity on a column of silica gel or through tlc. Progressively polar lipids elute from the colour as solvents of increasing polarity are passed through it: two phase extraction.

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Can anyone tell me how to get the percent and theoretical yield here?

- 2129 11 W- CH 4521-6: Fischer Esterification Introduction Esters are among the most widespread of all naturaly liquids that are responsible for the pleasant odors of fruits and flowers. Examples are ethyl cinnamate, whic occurring.compounds. Many simple esters are fragrant Ts the smell of cinnamon, and isobutyl acetate, contributing to the aroma of cherries, raspberries and of giycerol and fatty acids Esters are characterized by having the functional group:RO.R,where Escher esterification. This reaction refluxes a carboxylic acid inan . However, the most common esters found in nature are fats and ble oils, which are esters a carbon is double-bonded to one alcohol, creating the ester plus water as oxygen atom and sin The most classic method for creating an ester is the products: estor orer alcohai +R-OH catalyst A strong acid, traditionally sulfurits acid, is used as a catalst. Since the reaction is at equilbrium, simply reacting one mole of asid with one mole of alcohol will give a mixnture of starting materals and yield of the product may be improved using le Chatelier's principle: . Using the alcohol as a solvent (le. arge excess wil hlp push the equllbrium to the right By sequestering water (a reaction product), the equilibrium is pushed to the right. The use of a solvent which forms low-bolling azeatropes with water, such as toluene, in conjunction with a Dean-Stark apparatus has a similar effect, as is the use of other drying agents like molecular sieves Since low molecular weight esters typically have lower boling points than their parent carboxylic acids and alcohols because they are not able to form hydrogen bonds, the ester products may be distilled out of the reaction vessel as they are formed. By removing the ester product in a reactive distillation, the equilibrium once again lies to the righ For today's experiment, you will be able to choose which sweet-smelling ester you want to make. The table of reactants below gives you an idea of the range of smells. An ester will esterification reaction. This reaction involves mixing an alcohol with a carboxylic acid to form an ester and water. The reaction is reversible and an example is shown below be synthesized using the Fischer catalyst acetc acid propanopropyl acetate (pear) 47

BIOC 2580 Lecture Notes - Lecture 13: Glycerophospholipid, Lipid Bilayer, Phosphatidylethanolamine

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