HIGH PERFORMANCE LIQUID CHROMATOGRAPHY CHIRAL SEPARATION OF D,L-PHENYLALANINE AND D,L-TRYPTOPHAN WITH QUATERNARY MOBILE PHASE MIXTURE BY COPPER MIXED CHELATE COMPLEXATION

A simple and rapid HPLC enatioseparation of D,L-phenylalanine (Phe) and D,L tryptophan (DL-Trp) was developed. The resolution of enantiomers couples was based in the formation of mixed chelating complexes between copper...

THE DISTRIBUTION OF RADON CONCENTRATION AND DEBIT GAMMA DOSE IN BUCHAREST AREA

This paper is the first complex approach regarding geochemical characterization of Bucharest municipality area by determination of debit gamma dose and radon concentration in subway stations, houses, public institutions...

EFFECTS OF pH VALUE ON THE ELECTRODEPOSITION OF Cu4SnS4 THIN FILMS

Copper tin sulfide thin films were electrodeposited on the indium tin oxide substrates in a bath containing CuSO4, SnCl2 and Na2S2O3 solutions. Various pH values ranging from 1.1 to 1.5 were attempted in order to determi...

A DSC STUDY OF gamma-AMINOBUTYRIC ACID GAMMA IRRADIATED

The behaviour on heating of irradiated with gamma rays and non-irradiated γ-amino-butyric acid (γ-AMB) was investigated by means of differential scanning calorimetry. γ-AMB decomposes before melting.

ROMANIAN CHEMICAL SOCIETY AT ITS 90 YEARS ANNIVERSARY