Preparation of water-soluble food-grade triphenylmethane colors
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United States of America Patent
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Oct 4, 1988
Grant Date -
N/A
app pub date -
Jul 31, 1987
filing date -
Aug 21, 1986
priority date (Note) -
Expired
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Abstract
A process for the preparation of a water soluble food-grade diaminotriphenylmethane colorant containing from 2 to 4 sulfo groups, comprising anodically oxidizing the corresponding leuco compound in an electrolysis cell divided into an anode space and a cathode space in the presence of from 0.01 to 2% by weight, based on the solution being oxidized, of a C.sub.2 -C.sub.4 -alkanol, urea, a urea derivative or a mixture thereof, at a potential .epsilon..sub.h .ltoreq.1250 mV and at a temperature .ltoreq.+40.degree. C. The colorants obtained are produced in high yield and are of food quality.
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