[22] Ding. Polyt. Journ., 1893, cclxxxvii. pp. 258, 283, 300.
Analyses of Purified Corium.
| Analyst. | Material. | C | H | N | O | S |
|---|---|---|---|---|---|---|
| Stohmann and Langbein | .. | 49·9 | 5·8 | 18·0 | 26·0 | 0·3 |
| Müntz | Ox-hide | 51·8 | 6·7 | 18·3 | 23·2 | .. |
| Von Schroeder and Paessler | Ox, calf, horse, camel, pig, rhinoceros | 50·2 | 6·4 | 17·8 | 25·4 | .. |
| „ | Goat and deer | 50·3 | 6·4 | 17·4 | 25·9 | .. |
| „ | Sheep and dog | 50·2 | 6·5 | 17·0 | 26·3 | .. |
| „ | Cat | 51·1 | 6·5 | 17·1 | 25·3 | .. |
Analyses of Gelatin (free from Ash).
| Analyst. | C | H | N | O |
|---|---|---|---|---|
| Von Schroeder and Paessler | 51·2 | 6·5 | 18·1 | 24·2 |
| Mulder | 50·1 | 6·6 | 18·3 | 25·0 |
| Fremy | 50·0 | 6·5 | 17·5 | 26·0 |
| Schützenberger | 50·0 | 6·7 | 18·3 | 25·0 |
| Chittenden and Solly[23] | 49·4 | 6·8 | 18·0 | 25·1 |
[23] Contained also 0·7 sulphur. Journ. Physiol., xii. p. 23.
It will be noted that the above analyses of skin differ more widely among themselves than their average does from that of the gelatin analyses, though on the whole the nitrogen is somewhat higher in the latter. The molecular weight of gelatin must be very high,[24] and any empirical formula founded on ultimate analysis therefore quite hypothetical. Bleunard,[25] Schützenberger and Bourgois,[26] and Hofmeister agree on the formula C76H124N24O29, which leads to the following percentage composition:—
| per cent. | ||||
|---|---|---|---|---|
| C76 | = | 912 | = | 49·7 |
| H124 | = | 124 | = | 6·8 |
| N24 | = | 336 | = | 18·3 |
| O29 | = | 464 | = | 25·2 |
| 1836 | 100·0 | |||
[24] Paal (Berichte D. Ch. Ges., xxv. (1892) pp. 1202-36, and Ch. Soc. Abst., 1892, pp. 895-7) calculates a molecular weight of about 900 from physical (freezing, boiling point) methods.
[25] Annales de Chimie [5] xxvi. p. 18.