1. Proteins

2. Other than water, protein are the chief constituents of the cells of the body. Proteins are much more complex than carbohydrates or lipids. All proteins contain the elements carbon, hydrogen oxygen and nitrogen. Some also contain sulfur, phosphorus.

3. Proteins Proteins function in the body in building of new cells. Also in the maintenance of existing cells. Also in the replacement of old cells. Proteins are the most important compounds in the body. They are also valuable source of energy in the body.

4. Proteins They are involved in the regulation of metabolic processes.. Hormones. Also in the catalysis of chemical reaction.. Enzymes. In the body’s defense against infection. In the transmission of impulses In the transmission of hereditary characteristics. Are components of the skin, hair, nails, and connective tissues.

5. Amino acids Proteins are polymers built up of simple units called amino acids. Hydrolysis of proteins yield amino acids. Is an organic acid that has an amine group attached to a chain containing an acid group The amine group ( --NH2) can be anywhere on the chain.

6. Amino acids. The body can synthesize some, but not all of the amino acids it needs Those it cannot synthesize must be supplied in food.--- Essential amino acids. These are Isoleucine, Leucine, Lysine, Methionine, Phenylalanine, Threonine, Tryptophan, Valine, Histidine The non essential amino acids are…Alanine, arginine, Asparagine, Aspartic acid, cystein, cystine, glutamic acid, glutamine, glycine, ornanthine, proline, serine, Taurine, Tyrosine.

7. Isoleucine

8. Leucine

9. Proteins Proteins consist of many amino acids held together by Peptide linkage When 2 aminoacids combine,the product is called a dipeptide. When 3..Tripeptide. When protein is hydrolyzed, it breaks down into smaller units and eventually forming amino acids. Likewise when amino acids combine, they form dipeptides, tripeptides then eventually proteins.

10. Peptide bond

11. Classification 3 categories. Simple, conjugated, and derived. Simple proteins yield only amino acids on hydrolysis e.g. albumin, globulins Conjugated proteins consist of a simple protein combined with a non protein compound e.g. lipoprotein, glycoprotein, phosphoproteins. On hydrolysis, conjugated proteins yield amino acids and some other types of compounds.

12. Proteins Derived proteins are produced by action of chemical, enzymes, on the other 2 types of proteins. Derived proteins include proteoses, peptones, polypepetides, tripeptides and dipeptide. Proteins are also classified according to solubility, composition, function and shape.

13. Structure of albumin