منابع مشابه
Resonance Raman spectroscopy of pyridoxal Schiff bases.
Resonance Raman (RR) spectra are reported for amino acid and amine adducts of pyridoxal 5'-phosphate (PLP) and 5'-deoxypyridoxal (5'-dPL) in aqueous solution. For the valine adducts, a detailed study has been carried out on solutions at pH and pD 5, 9, and 13, values at which the pyridine and imine protons are successively ionized, and on the adducts formed from 15N-valine, alpha-deuterovaline,...
متن کاملRapid photodynamics of vitamin B6 coenzyme pyridoxal 5'-phosphate and its Schiff bases in solution.
The active form of vitamin B6, pyridoxal 5'-phosphate (PLP), is an important cofactor for numerous enzymes in amine and amino acid metabolism. Presented here is the first femtosecond transient absorption study of free PLP and two Schiff bases, PLP-valine and PLP-alpha-aminoisobutyric acid (AIB), in solution. Photoexcitation of free PLP leads to efficient triplet formation with an internal conve...
متن کاملThe oxidation of Schiff bases of pyridoxal and pyridoxal phosphate with amino acids by manganous ions and peroxidase.
1. Oxygen was taken up rapidly when pyridoxal or pyridoxal phosphate was added to mixtures of pea-seedling extracts and Mn(2+) ions. 2. The increases in total oxygen uptake were proportional to the pyridoxal or pyridoxal phosphate added and were accompanied by the disappearance of these compounds. 3. In addition to Mn(2+) ions, the reactions depended on two factors in the extracts, a thermolabi...
متن کاملLuminescence and structural properties of lanthanide complexes of Schiff bases derived from pyridoxal and amino acids.
Lanthanide complexes of Schiff bases (SBs) with 1:1 and 1:2 (M:Lig) stoichiometric ratios were prepared by condensation of pyridoxal (PL) and aspartic acid (Asp) or l-histidine (His), respectively, in the presence of the appropriate metal chloride as a templating agent. These complexes were studied by optical spectroscopy and single crystal X-ray diffraction techniques. Crystallographic studies...
متن کاملNucleophilic Reactivities of Schiff Bases
Dedicated to Professor Heinrich Nöth on the occasion of his 85th birthday The nucleophile-specific parameters N and sN, as defined by the linear free energy relationship log k = sN(N +E) (J. Am. Chem. Soc. 2001, 123, 9500 – 9512), were determined for five imines 1a–e by studying the kinetics of their reactions with benzhydrylium ions in dichloromethane solution at 20 ◦C. These parameters allowe...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1979
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.76.12.6652