S. M. DAS GUPTA                                          259

                                        TABLE V

Relation between carotene and vitamin-A contents of milk and butter churned
                                     therefrom

Milk

Butter-fat

No. of sample

Carotene
(Y. U.)
per grm.
of
ether
extracted
fat

Vitamin-A
(B. U.)
per grm.
of
ether
extracted
fat

No. of sample

Carotene
(Y. U.)
per grm.

Vitamin-A
(B. U.)
per grm.

1

3.4

8.2

1

3.2

7.9

2

3.8

9.1

2

3.6

8.8

3

4.2

10.4

3

3.9

9.9

4

3.6

9.6

4

3.6

9.4

5

4.2

8.8

5

3.8

8.5

6

4.6

10.8

6

4.5

10.5

                                        TABLE VI

Effect of storage on the carotene and vitamin-A contents of butter-fat kept in a
                         sterilised bottle sealed with paraffin wax

Melted butter

Fresh
sample

One
month's
storage

Three
months'
storage

Six
months'
storage

R. W. value . . .

24.3

24.2

24.8

23.8

Iodine value . . .

35.6

35.8

36.2

37.6

Carotene (Y. U.) . . .

2.4

2.1

1.8

1.2

Vitamin-A (B. U.) . .

4.2

3.8

3.6

2.8