May 10, 2021 · BPA and BPS analyses were performed using an Aijiren series (Aijiren Technologies, Palo Alto, CA, USA) high-performance liquid chromatograph (HPLC) system equipped with an Aijiren 6495 Triple Quadrupole (MS) system. 5 µL volume of the extract was injected into an analytical column (Eclipse XDB C18 column, 250 mm length × 4.6 mm I.D. × 5