Description General description Microcystin-LY is generally produced by cyanobacteria in freshwater systems and is found as a toxic analog of microcystin. Application Microcystin-LY may be used as an analytical reference standard for the determination of the analyte in raw and treated waters using high-performance liquid chromatography with photo-diode array detection (HPLC-PDA). Refer to the product′s Certificate of Analysis for more information on a suitable instrument technique. Contact Technical Service for further support.