Chemistry: physical processes – Physical processes – Crystallization
Patent
1980-07-31
1982-07-27
Turk, Arnold
Chemistry: physical processes
Physical processes
Crystallization
23230M, 23929, 260207, G01N 3352, C07C10706, C09B 2900
Patent
active
043415288
ABSTRACT:
The Habbal reaction as a simple spectrophotometric method for the determination of urinary vanilmandelic acid (VMA) is presented. The Habbal reaction is based on the diazo reaction, the specificity of which is maximally increased by citrate buffer extraction of urinary phenolic acids and ethyl acetate extraction of the diazo derivative. The excellent specificity of the general reaction is proved by interference studies, specific destruction of VMA and chromatography. However, the diazo derivative of VMA is unstable in organic solvent ethyl acetate and, according to the Habbel reaction, is stabilized by dimethylsulfoxide (DMSO) and 2-amino-2-methyl-1-propanol (AMP) to give a stable blue chromophore absorbing maximally at 600 nm. The method is quick (20 minutes), exhibits excellent sensitivity, linearity and correlation with the highly specific method of bidirectional paper chromatography.
REFERENCES:
patent: 3236601 (1966-02-01), Harvill
patent: 3446751 (1969-05-01), Weichselbaum
patent: 3482942 (1969-12-01), Schneider
patent: 3585004 (1971-06-01), Mast
patent: 3836332 (1974-09-01), James
Siddiqui et al., Chemical Abstracts, vol. 89, 1978, No. 89: 103042g.
Rational Alternative
Turk Arnold
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