Dairy Chemistry And Biochemistry

Table 4.4 Amino acid composition of the major proteins occurring in the milk of western cattle (Swaisgood, 1982)

Acid

~~

391- Xs2- K- B- Y1- ??-? 3,- j- Lact 0- a- Lact -

Casein B Casein A Casein B Casein A’ Casein A2 Casein A’ Casein A globulin A albumin B

ASP
Asn
Thr
Ser
Ser P
Glu
Gln
Pro
Ala
Val
Met
Ile
Leu
TY r
Phe
TrP
LYS
His
A rg
PyroGlu

Total residues
Molecular weight
HO,,, (kJ/residue)

GlY

f Cys

8

24

15

17

9

9

0

11

5

11

17

10

8

2

14

5

6

0

199

23 612

4.89

4

14

15

6

11

25

15

10

2

8

2

14

4

11

13

12

6

2

24

3

6

0

207

25 228

4.64

4

7

14

12

1

12

14

20

2

15

2

11

2

13

8 9 4 1 9 3 5 1

169

19005

5.12

4 4 2

5 3 1

9 8 4

11 10 7

5 I 0

18 11 4

21 21 11

35 34 21

5 4 2

5 5 2

0 0 0

19 17 10

6 6 4

10 7 3

22 19 14

4 4 3

9 9 5

1 1 1

11 10 4

5 5 4

4 2 2

0 0 0

209 181 104

23 980 20 520 11 822

5.58 5.85 6.23

2 1 4 7 0 4

11

21

2

2

0

10

4

3

14

3 5 1 3 3 2 0

102

11 557

6.29

11

5

8

7

0

16

9

8

3

14

5

10

4

10

22

4

4

2

15

2

3

0

162

18362

5.03

9

12

7 7 0 8 5 2 6 3 8 6 1 8

13

4

4

4

12

3

1

0

123

14 174

4.68