Na. Kolegova et Vv. Volodin, Determination of ecdysteroids by reversed-phase high-performance liquid chromatography using fluent systems with electron-donor additives, J ANALYT CH, 54(12), 1999, pp. 1139-1141
Electron-donor additives to eluents used for the reversed-phase HPLC determ
ination of ecdysteroids considerably influence the chromatographic paramete
rs in the separation of substances with close retention times. By the optim
ization of separation factor (alpha) and peak resolution (R-s), a ternary H
2O-AcN-THF (100 : 16 : 4, v/v) system for reversed-phase HPLC that provides
the selective separation of ecdysteroids was found.