3 methylfuran

Analytical standards for twenty-two amino acids (list in Table 2, norvaline and sarcosine), six sugars (D-fructose, D-glucose, sucrose, Dmaltose, β-lactose and phenyl-b-D-glucopyranoside), furan and five alkylfurans (2-methylfuran, 3-methylfuran, 2-ethylfuran, 2,5-dimethylfuran and 2,3-dimethylfuran) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Thiophene and 2-methylthiophene were bought from VWR (Radnor, PA, USA) and acrylamide from Chiron (Trondheim, Norway). For labelled standards analogous, furan and alkyls (furan-d 4 , 2-methylfuran-d 6 , 3-methylfuran-d 3 and 2,5-dimethylfuran-d 3 ) were bought at Toronto Research Chemicals (Toronto, ON, Canada), while acrylamide (acrylamide-d 3 ) comes from Chiron.
Methanol HPLC grade, boric acid, trifluoroacetic acid (TFA), hexamethyldisilazane (HMDS) and Carrez Solution II (30% ZnSO4) were

Water for chromatography (HPLC grade), methanol gradient grade for liquid chromatography and sodium chloride were supplied by Merck (Darmstadt, Germany). Furan (chemical purity ≥ 98 %), 2methylFuran (chemical purity ≥ 99 %), 3-methylFuran (chemical purity ≥ 98 %), 2-ethylFuran (chemical purity ≥ 99 %), 2,5-dimethylFuran (chemical purity ≥ 99 %) and 2-pentylFuran (chemical purity ≥ 97 %) were purchased at Sigma Aldrich (St. Louis, USA). 2,5-DimethylFuran-d 6 (chemical purity ≥ 98 %, isotopic purity ≥ 99 %) was purchased at AlfaAesar (Haverhill, Massachusetts, USA). Furan-d 4 (chemical purity ≥ 99 %, isotopic purity ≥ 99 %) was purchased at HPC Standards GmbH (Cunnersdorf, Germany). All the other internal standards (IS) were from Toronto Research Chemicals (Toronto, Canada) with the following labelling and purity : 2-methylFuran-d 6 (chemical purity ≥ 98 %, isotopic purity ≥ 98 %), 2ethylFuran-d 5 (chemical purity ≥ 90 %, isotopic purity ≥ 94 %) and 2-pentylFuran-d 11 (chemical purity ≥ 96 %, isotopic purity ≥ 98 %).