Upload
vedpal-yadav
View
49
Download
1
Embed Size (px)
DESCRIPTION
Citation preview
Proteins
are compounds of carbon, hydrogen, oxygen, nitrogen and sometimes sulphur, phosphorus
amino acids: – unit of proteins
– about 20 different types
– essential and non-essential types
An amino acid molecules
H2Namino group
COOHcarboxyl group
C
R
H
The condensation and hydrolysis of a polypeptide
5
1 4
3
2
1 2 3 4 5
hydrolysiscondensation
Condensation of two amino acid to form a dipeptide
H2N C
R1
H
C
O
OH HN
H
C
H
R2
COOH
H2N C
R1
H
O
H
C
H
R2
COOHC---N
H2O
Functions of proteins
components of cell membranes and cytoplasm
for growth and repair of body cells for making enzymes, hormones, antibodies and
haemoglobin provide energy during starvation excess protein is under deamination in the liver deficiency disease: Kwashiorkor
Test for proteins / Biuret test
egg white solution
1 cm3 NaOH solution
Put CuSO2 solution drop by drop, and shake the mixture after addition of each drop
Positive result: purple colour