## Abstract UV spectra of nicotinamide in dilute aqueous solutions of hydrochloric acid (4 · 10^−4^‐m. −0,1‐m.) and in alkaline solution were mea‐sured at 20°. The ionisation constants of nicotinamide for different ionic strengths were calculated from the experimental data. The ionic strength was v
Die Wechselwirkung von Polymyxin B mit zweiwertigen Kationen in wässeriger Lösung
✍ Scribed by H. Brintzinger
- Publisher
- John Wiley and Sons
- Year
- 1961
- Tongue
- German
- Weight
- 572 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
ACTA
b) Attaque Ci la carboxypeptidase: Cet enzyme libere a p r h 2 h dBjja His et la totalit6 de Leu et Phe. L'unique peptide rBsiduel, demeurant inchang6 m&me apres 24 h de digestion, migre moins vite (Eq,g = 1.0 Leu) que le decapeptide XXXI. Aprbs hydrolyse acide totale, il fournit Asp, Arg, Tyr, Val, His et Pro; il contient Bgalement la lencine dont la tache coincide avec celle de l'heptapeptide au pH 1,9. c) Attaque ri la trypsine: I1 sc produit aprks 24 h une scission complete du dicapeptide en deux fragments. 1-e premier migrant plus vite (E:,g = 0.8 His) que le decapeptide XXXI, fournit apr& hydrolyse Asp et Arg. Le seconde migre moins vite (E:,g = 1,0 Asp) et donne par hydrolyse totale Val, H i s . Pro, Phe, Tyr et Leu.
SUMMARY
Va15-angiotensin-I and one of its optical isomers, Vd5-~-Phes-angiotensin-I, were synthesized by a new way excluding any possibility of racemisation. The optical purity of the intermediary and final peptides was furthermore ascertained by enzymatic degradation. Val5-angiotensin-I exhibited the full biological activity expected. V ~F D -Phe8-angiotensin-I was found to be practically inactive. It failed also to antagonize Val5-or Ileu5-angiotensin-I or to inhibit t converting enzyme *.
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