Solvent extraction–spectrophotometric determination of berberine and benzethonium in drugs with tetrabromophenolphthalein ethyl ester by batchwise and flow injection methods

Spectrophotometric determination of cationic surfactants with Orange II

1968 • 118 citations

Germicidal Quaternary Ammonium Salts in Dilute Solution A Colorimetric Assay Method

1943 • 100 citations

Spectrophotometric determination of phosphorus as orthophosphate based on solvent extraction of the ion associate of molybdophosphate with malachite green using flow injection

1987 • 61 citations

The determination of small amounts of long-chain tertiary alkylamines and quarternary ammonium salts

1967 • 39 citations

Spectrophotometric determination of trace amounts of quaternary ammonium salts in drugs by ion-pair extraction with bromophenol blue and quinine

1983 • 39 citations

Extraction—spectrophotometric determination of benzethonium and benzalkonium salts with bomocresol green and quinine

1983 • 20 citations

Application of Thermochromism in Spectrophotometric Analysis: Selective Determination of Berberine in Pharmaceuticals by Solvent Extraction

1979 • 12 citations

Spectrophotometric determination of berberine by solvent extraction

1975 • 9 citations

Detection and Determination of Quaternary Ammonium Compounds applied on Bamboo Sheath

1976 • 6 citations