SPECTRO-PHOTOMETRIC METHOD TO QUANTITATIVE DETERMINATION OF VALEPOTRIATES

SPECTRO-PHOTOMETRIC METHOD TO QUANTITATIVE DETERMINATION OF VALEPOTRIATES

The process comprises extraction by solvents (methyl alcohol, dichloroethane, ethyl acetate, chloroform, 70% ethyl alcohol or binary mixts. of these), vacuum, distn. to dryness, treatment with methyl alcohol and spectrophotometry based on the extinctions of the colourings. Thus condensation reaction...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: ASAFTEI RODICA, RO, GROSU ELENA, RO, VAGAI FLORENTINA, RO, GROSU ISIDOR, RO
Format: Patent
Sprache:eng ; rum
Schlagworte:
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Zusammenfassung:The process comprises extraction by solvents (methyl alcohol, dichloroethane, ethyl acetate, chloroform, 70% ethyl alcohol or binary mixts. of these), vacuum, distn. to dryness, treatment with methyl alcohol and spectrophotometry based on the extinctions of the colourings. Thus condensation reaction with 2,4-dinitrophenyl hydrazine at 480nm wavelength in 1cm quartz containers is here compared with the extinction value of the pure prod. under the same conditions.