Full resolution (JPEG) - On this page / på denna sida - II. The Protein Substances - I. Simple Proteins - B. Albuminoids or Albumoids - C. Cleavage Products of Simple Proteins - 1. Albuminates
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ALBUMINATES , 125
koilin. The fibroin A came from ordinary silk; fibroin B and the sericin
originated from Indian Tussah silk.
Elastin.! | Gelatin.? | Koilin.4 |Fibroin A!/Fibroin B*| Sericin.? |SpiderSilk®
ho | 25.75 | 19.25 1,2 36.0 9.5 1.5 35.13
PUUINIOT Cyo’is.s ae: 6.6 3,0 5.8 21.0 24.0 9.8 23.4
Wilh CRS es eke P 1.0 — — — — = —
Weeueine. . «0h... 2171 9.23 13:2 15 15 4.8 1.76
MIETINOF cise ode cs 0.4 - 1.6 2.0 5.4 —_
Aspartic acid... .. —_— 1.23 23 —_— Dep 2.8 —
Glutamic acid.....| 0.8 16.8% bi2 = 1.0 1.8 LUATO
WOVRHING sees. — — Or eie —_ — a —
Phenylalanine.....| 3.9 1.08 2.3 lab 0.6 0.3 —-
PEOCING oc vs, %- 0.34 – 5.4 10.5 9.2 1.0 8.20
NIG? a Lheedl Fei Sy, — Ati, 3.0 3.68
Oxyproline....... — 6.4 — — — — –
Istidine.....\..)..:. —- 0.4 0.035 = — —
ATEIMNINE.. 06 33 6s 0.3 9.3 3.605 0 — —_ | 5.24
EVs — 5.6 1.645 - — —
C. Cleavage Products of Simple Proteins.
On the hydrolysis of proteins by the aid of acids, alkalies or by
enzymes, cleavage products are obtained which represent various inter-
mediary steps between the native proteins on one side and the simple
cleavage products, the amino-acids, on the other side. Among these
products we have for a long time known two chief groups which still
retain, to a high degree, their protein character, namely, the albuminates
and the proteoses (and peptones).
1. Albuminates.
Alkali and Acid Albuminates. The native proteins are modified
by the action of sufficiently strong acids or alkalies. By the action of
alkalies all native albuminous bodies are converted, with the elimina-
tion of nitrogen, or by the action of stronger alkali, with the extraction
of sulphur also, into a new modification, called alkali albuminate. If
caustic alkali in substance or in strong solution be allowed to act on a
1 Cited from Abderhalden’s Lehrbuch d. physiol. Chem., 1909.
2 Cohnheim, Chemie d. Eiweisskérper 3 d. Aufl.
8 Skraup and Biehler, Monatsh. f. Chem., 30.
4k. B. Hoffmann and Pergl. Zeitschr. f. physiol. Chem., 52.
5 vy. Knaffl-Lenz, ibid., 52.
6 Abderhalden and Spack, ibid., 62.
7Strauch, zbid., 71.
8 E. Fischer, zbid., 53.
* Calculated as arginine.
10 This figure is somewhat uncertain.
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