THE REACTION OF PYRIDINE NUCLEOTIDES WITH CARBONYL COMPOUNDS

The stability of pyridine nucleotides.

Diphosphopyridine nucleotide and triphosphopyridine nucleotide when used in appropriate enzyme systems become exceedingly useful reagents for the measurement of almost any biochemical substance. A companion paper describes procedures for measuring each of the pyridine nucleotides, whether in the oxidized or reduced form, at concentrations as low as 1O-g M and in amounts as small as lo-l5 moles ...

The fluorometric measurement of pyridine nucleotides.

Measurement of DPNH’ or TPNH by absorption at 344 rnp has been a standard procedure for many years and has been used to study innumerable enzyme reactions. In spite of the proved value of this calorimetric method, there may be advantages in fluorometric methods for the pyridine nucleotides. First, it has been found practicable with a fluorometer to determine separately oxidized and reduced pyri...

The reaction of azide ions, N3, with metal carbonyl compounds; an electrospray mass spectrometry study

Monoand poly-nuclear metal carbonyls, and substituted analogues, have been analysed in the presence of N3 − ions by negative-ion electrospray mass spectrometry. Most complexes yield the appropriate isocyanate-containing anions by conversion of a CO ligand to an NCO one with elimination of N2. In some cases [M+N3] − ions are observed; for species such as H2Os3(CO)10 or Ru5C(CO)15 these arise fro...

Pyridine nucleotides in erythrocyte metabolism.

comparison of catalytic activity of heteropoly compounds in the synthesis of bis(indolyl)alkanes.

heteropoly acids (hpa) and their salts have advantages as catalysts which make them both economically and environmentally attractive, strong br?nsted acidity, exhibiting fast reversible multi-electron redox transformations under rather mild conditions, very high solubility in polar solvents, fairly high thermal stability in the solid states, and efficient oxidizing ability, so that they are imp...