Lipid

The importance of lipid

- Provide energy to the body - The absorption of vitamins A, D, E, K. - A part of cells and tissues in the body.- Prevents heat loss . Moisturize dry skin does

not break - Provides essential fatty acids to the body.

**Lipid 1 g. energy 9 kcal.

Lipid

Glycerol

Fatty acid

Fatty acid

Fatty acid+Triglyceride

+3H2O

=>

C,H,O ; H:O = 2:1

Ex. the types of lipidSimple lipid Lipid complex Derived lipid

Fat & Oil- Phospholipid- Glycolipid

- Sex hormones- Bile salt

Fatty AcidSaturated Fatty Acid

Unsaturated Fatty Acid

Saturated Fatty Acid

Structure : CnH2n+1COOH

Boiling point : High

(Fat ;Animals )

Characteristic- Single bond- Straight chain

Ex. Palmitic acid,Stearic acid

Unsaturated Fatty Acid (Oil ; Plants)

Structure : CnH2nCOOH

Boiling point : Low

Ex. Linoleic acid,Oleic acid , Oil exept for coconut and plam oil.

Characteristic- Double bond - Non-straight chain

Lipid Test

Drop of substances falls on paper if it is lipids it

makes a mark which is bright and translucent (lets light through)

Lipid Test

Lipid + NaOH soap boiled

+ ->>boiled

Fat Reaction

Lipid + Water Carboxylic acid + Glycerol

Hydrolysis

Oxidation

Reaction racid fat

Unsaturated lipid + Oxigen Aldehyde

**Aldehyde = “Substances that cause rancidity.”