TY - BOOK AU - Cardellinia,J. TI - Step gradient elution in gel permeation chromatography. A new approach to natural products separations N2 - ABSTRACT.-A stepgradient elution sequence in gel permeation chromatography has been shown to be a mild, rapid and efficient technique for initial fractionation of crude extracts of plants and invertebrates. The procedure is described, and two examples of its application are presented UR - https://drive.google.com/file/d/1VaPnLu8zAsR3D_d-6c6wn5oT2djOrznQ/view?usp=drivesdk ER -