Simultaneous densitometric determination of shikonin, acetylshikonin, and beta-acetoxyisovaleryl-shikonin in ultrasonic-assisted extracts of four Arnebia species using reversed-phase thin layer chromatography - Sharma, N; Sharma, U K; Gupta, A P; Devla, Sinha AK, Lal B, Ahuja PS (J Sep Sci, 2009)