Based on these results, the proposed analysis method selected the cation-exchange MCX-SPE cartridge to remove unnecessary components, which could interfere with the precise quantitative analysis, instead of DSC-C18 SPE cartridge used in BfR method. However, the developed method employed the same ...
MEQ (purity > 98%) was purchased from A Chemtek, Inc. (Woburn, MA, USA). Sea cucumber samples were purchased from the local market. Acetonitrile, Methanol, formic acid, and ethyl acetate (HPLC grade) were purchased from Dima Technology Inc. (Muskegon, MI, USA). Metaphosphoric acid (ana...