The quantitative determination of some mitragyna oxindole alkaloids after separation by thin-layer chromatography. IV. Comparison of ultra-violet spectrophotometry, colorimetry and densitometry as methods for the quantitative determination of oxindole alkaloids in plant material.
D000470:Alkaloids / Q000032:analysis*; D002855:Chromatography, Thin Layer; D003124:Colorimetry; D003720:Densitometry; D007211:Indoles / Q000032:analysis*; D008722:Methods; D010944:Plants / Q000032:analysis; D013053:Spectrophotometry; D014466:Ultraviolet Rays
D000470:Alkaloids; D007211:Indoles