Mar 21, 2022 · Standards used in mass spectroscopy analysis were purchased from MilliporeSigma. Autosampler vials were obtained from Thermo Fisher Scientific (Waltham, MA, USA). Silanized micro vial inserts were from Aijiren (Santa Clara, CA, USA; part #5181e8872) and inserts were from VWR (Radnor, PA, USA).