“…In order to sensitively detect BLMs, many methods have been developed over the past decades, such as high-performance liquid chromatography (HPLC), [18][19][20][21][22] radioimmunoassay (RIA), 17,23,24 enzyme immunoassay (EIA), 25,26 microbiological assay, 27,28 and uorescence resonance energy transfer (FRET). 29 However, the above methods were usually challenged with some disadvantages, such as complicated instruments for HPLC, high cost for RIA and EIA, and tedious experimental procedures for FRET.…”