Millipore advantage a10

We selected standard materials of 19 microbial SMs and two plant metabolites (linamarin and lotaustralin) that have been previously identified in indoor environments for the study [14 (link)]. Since some mycotoxins were reported to be present in indoor building material samples [15 (link)], fifteen mycotoxins were also included in the list of 36 total analytes. Table 1 lists the metabolites and mycotoxins evaluated in the study. We were able to obtain nine mycotoxin isotopes labeled with ¹³C that are available on the market. Table 2 lists these nine isotope-labeled mycotoxins and one unlabeled compound that were used as the candidate ISTDs, their suppliers, and abbreviated names. Methanol (>99.9%, LCMS grade), acetonitrile (>99.9%, LCMS grade), acetic acid (≥99.7%, LCMS grade), and ammonium acetate as mobile phase buffer (≥99.0%, LCMS grade) were purchased from Fisher Scientific (Waltham, MA, USA). Ultrapure water was collected through a Millipore Advantage A 10 (EMD Millipore, Burlington, MA, USA) equipped with an LC-pak^® polisher with resistivity of 18.2 MΩ cm at 25.0 °C.

Trimethylene carbonate (TMC, Boehringer Ingelheim, Ingelheim, Germany), stannous octoate (Sn(Oct)₂, Spectrum Chemical MFG Corp., New Brunswick, NJ, USA), chloroform (Merck Millipore, Darmstadt, Germany, Emparta cat. 1.07024.2500, analytical grade), ethanol for membrane washing (Boom B.V., Meppel, The Netherlands, cat. 84050065.5000), ethanol for PTMC precipitation and as non-solvent (Merck Millipore, Darmstadt, Germany, Emsure cat. 1.00983.1000, analytical grade), propan-1-ol (Sigma-Aldrich, Darmstadt, Germany, cat. 279544), butan-1-ol (Sigma-Aldrich, Darmstadt, Germany, cat. 281549), hexan-1-ol (Sigma-Aldrich, Darmstadt, Germany, cat. 471402), poly(ethylene oxide) (PEO) 5,000,000 g/mol (Sigma-Aldrich, Darmstadt, Germany, cat. 189472), pentaerythritol triacrylate (PETA) (Sigma-Aldrich, Darmstadt, Germany, cat. 246794), 2-Hydroxy-4′-(2-hydroxyethoxy)-2-methylpropiophenone (Irgacure 2959) (Sigma-Aldrich, Darmstadt, Germany, cat. 410896) and deuterated chloroform (Sigma-Aldrich, Darmstadt, Germany, cat. 151823) were all used as received. Ultrapure water (MilliQ water) was produced by a Millipore Advantage A10 (Merck Millipore, Darmstadt, Germany). Additional information about the function and MW of the components used in the polymer dopes can be found in Table 1.