Isolation and preparative purification of microcystin variants.
Preparative reversed-phase liquid chromatography was successfully used to purify two microcystins (microcystin LR and microcystin LA) from a cyanobacterial process waste. The separation protocol involved extraction of lyophilized cells by methanol, isolation and concentration by solid-phase extraction, and purification by reversed-phase HPLC. Milligram-level loading of microcystins was obtained on a solid-phase extraction cartridge packed with 0.5 g of C18 stationary phase. The separations were first carried out on an analytical column and then scaled-up to a preparative column. The microcystins were quantified by HPLC and enzyme-linked immunosorbent assay. A method to remove microcystins rapidly and economically from the cyanobacterial process waste is also described.
Department of Bioresource Engineering, Oregon State University, Corvallis 97331-3906, USA.
S
S
Ramanan
J
J
Tang
A
A
Velayudhan
D001427:Bacterial Toxins / Q000302:isolation & purification*; D002851:Chromatography, High Pressure Liquid; D000458:Cyanobacteria / Q000737:chemistry; D004797:Enzyme-Linked Immunosorbent Assay; D008387:Marine Toxins; D052998:Microcystins; D010456:Peptides, Cyclic / Q000302:isolation & purification*
D001427:Bacterial Toxins; D008387:Marine Toxins; D052998:Microcystins; D010456:Peptides, Cyclic; C049865:cyanoginosin-LA; C057862:cyanoginosin LR