Fatty Acid and Test Specific Objective

2643 Words Mar 1st, 2012 11 Pages
EXPERIMENT NO. 6

LIPIDS

I NUR 4
GROUP 9

POLICARPIO, JOHN PAUL (A & B)
QUERUBIN, KIMBERLY (C & D)
QUILALA, REGENE (E & F1)
RAMOS, PRACCEDES (F2a & F2b)
SABALDICCA, VENZ (F2c & F2d)

INTRODUCTION Lipids are organic compounds found in living organisms that are insoluble or slightly soluble in water but soluble in non-polar organic solvents.

Lipids can be classified into four groups which are -fats, oils, and waxes, -compound lipids, -steroids, and -derived lipids.

Various experiments are done on lipids. Some tests are for saturation, presence of certain compounds, or for the different chemical reactions that lipids undergo.

Lipids may be composed of esters, amides, alcohols, cyclic, acyclic, or polycyclic
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It is predominantly composed of the elements carbon, hydrogen, and oxygen. Many classes of lipids also contain nitrogen and phosphorus. The relative amounts of these elements, as well as their structural positions, determine the degree of solubility of the lipid in various solvents. Lipids with high hydrocarbon content are relatively nonpolar in nature and insoluble in water. The ionic character of a lipid can be altered by changes in solvent pH. For example, if the solvent contains a strong acid or a strong base, hydrolysis of some of the ester bonds will occur. When this happens, the products of hydrolysis may have solubility properties very different from those of the original lipid molecule.

Structures of the different Samples and Solvents

Sample 1: Vegetable Oil (Oleic acid)
Oleic acid has the chemical formula C17H33COOH

Due to its large nonpolar portion, oleic acid is insoluble in water and, being less dense than water, it floats on the water surface. The polar –COOH end, however, is attracted to water molecules. So, a thin coating of oleic acid on the surface of water results
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