High-Pressure Liquid Chromatography of 4,4′-Diazoaminobis-(5-methoxy-2-methylbenzenesulfonic Acid) in FD&C Red No. 40
Keyword(s):
Abstract Ten analysts representing 7 laboratories participated in the evaluation of a high-pressure liquid chromatographic procedure for the determination of 4,4′-diazoaminobis(5-methoxy-2-methylbenzenesulfonic acid) (DMMA) in FD&C Red No. 40; each collaborator analyzed 7 samples. Between-laboratory standard deviations ranged from 0.0015 to 0.0033% for samples nominally containing 0–0.05% DMMA. The stability of DMMA vs. pH was also studied. It is recommended that the high-pressure liquid chromatographic method be further studied.
1977 ◽
Vol 60
(1)
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pp. 210-212
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1975 ◽
Vol 58
(4)
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pp. 754-756
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1976 ◽
Vol 59
(5)
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pp. 989-992
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1978 ◽
Vol 39
(02)
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pp. 466-473
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