## Abstract This short review concerns the protonation of Schiff bases by halogenic or carboxylic acids with a bias toward the chromophore of visual and bacterial rhodopsins. It is pointed out that the weak acids available in these pigments could not protonate the retinyl Schiff base 100% and that
Spectroscopic and calorimetric studies on the protonation of polymeric amino acids
β Scribed by Barbucci, R.; Casolaro, M.; Ferruti, P.; Nocentini, M.
- Book ID
- 126140366
- Publisher
- American Chemical Society
- Year
- 1986
- Tongue
- English
- Weight
- 655 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0024-9297
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π SIMILAR VOLUMES
To gain more information about the effect of solvent on β£-amino acids, the stoichiometric protonation constants of 10 β£-amino acids (glycine, DL-alanine, DL-valine, L-leucine, L-isoleucine, DL-phenylalanine, Lserine, L-threonine, L-asparagine, and L-glutamine) in different dioxan-water mixtures have
Positive ions produced by an atmospheric pressure spray from aqueous solutions of alanine, leucine, threonine, serine, aspartic acid, and glutamic acid are detected with a double focusing mass spectrometer to study the origin of the observed ions. The relative intensities of the protonated amino-aci