Full resolution (JPEG) - On this page / på denna sida - XIII. The Milk - Human Milk
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
HUMAN MILK. 663
ing proteins and about 20 per cent for rest nitrogen. The principal part
of the rest nitrogen is considered as urea.
From a quantitative standpoint, the most essential differences between
woman’s and cow’s milk are the following: As compared with the quan-
tity of albumin, the quantity of casein is not only absolutely but also
relatively smaller in woman’s milk than in cow’s milk, while the latter is
poorer in milk-sugar. Human milk is richer in lecithin, at least relatively
to the amount of protein. Burow found 0.49-0.58 p. m. lecithin in cow’s
milk and 0.58 p. m. in woman’s milk, which corresponds to 1.40 per cent
for the first milk and 3.05 per cent for the second, calculated on the per-
centage of protein. Nerking and Haensel found as average for lecithin
in cow’s milk 0.63 p. m. and in woman’s milk 0.50 p. m. Glikin found
0.765 p. m. lecithin (phosphatides) as average for cow’s milk and 1.329
p. m. for human milk. Koch found that both human milk and cow’s
milk contain lecithin as well as cephalin. The total quantity of both
bodies in human milk was 0.78 p. m. and in cow’s milk 0.72-0.86 p. m.
The quantity of nucleon is greater in woman’s milk. Wittmaack claims
that cow’s milk contains 0.566 p. m. nucleon, and woman’s milk 1.24
p. m., and according to Valenti the quantity of nucleon in human milk
is indeed still higher. Siegfried finds that the nucleon phosphorus
amounts to 6.0 per cent of the total phosphorus in cow’s milk and 41.5
per cent in woman’s milk, and also that in human milk the phosphorus
is almost all in organic combination. This does not agree with the results
of Sikes who found on an average of only 42 per cent of the total P2O5
in organic combination. Because of the large amount of casein (and
calcium phosphate) cow’s milk is much richer in phosphorus than human
milk. The relation PoOs:N, according to Schlossmann,1
is equal to
1:5.4 in human milk and 1:2.7 in cow’s milk. Woman’s milk is poorer
in mineral bodies, especially lime, and it contains only one-sixth of the
quantity of lime as compared with cow’s milk. The mineral constituents
of human milk are better assimilated by the organism of the nursing
child than those of cow’s milk. Human milk is also claimed to be poorer
in citric acid (Scheibe 2
), although this is not an essential difference.
Another difference between woman’s milk and other varieties of milk is
Umikoff’s reaction, which seems to depend upon the quantitative composition,
especially the relation between the milk-sugar, citric acid, lime, and iron (Sieber 3
).
This reaction consists in treating 5 cc. of woman’s milk with 2.5 cc. ammonia
1
Burow, Zeitschr. f. physiol. Chem., 30; Koch, ibid., 47; Wittmaack, ibid., 22;
Siegfried, ibid., 22; Nerking and Haensel, Bioch. Zeitschr., 13; Glikin, ibid., 21; Valenti,
Biochem. Centralbl., 4; Schlossmann, Arch. f. Kinderheilkunde, 40; Sikes, Journ.
of Physiol., 34.
2
Maly’s Jahresber., 21.
’Zeitschr. f. physiol. Chem., 30.
<< prev. page << föreg. sida << >> nästa sida >> next page >>
