Glucoarabinin potassium salt

MS-grade solvents used for UPLC analysis, acetonitrile (MeCN) water (H₂O), and formic acid (HCOOH), were provided by Romil (Cambridge, United States); analytical-grade solvents methanol (MeOH) and ethanol (EtOH) were supplied by Sigma-Aldrich (Milan, Italy). Water was purified using a Milli-Q system (Millipore, Bedford, United States). Acetic acid (Sigma-Aldrich) and ammonium hydroxide solution were provided by Sigma-Aldrich (Milan, Italy). Glucoarabinin potassium salt, glucocamelinin potassium salt, and homoglucocamelinin potassium salt were purchased from Extrasynthese (Lyon, France). Stock standard solutions (1 mg ml^–1) of each compound were prepared using methanol and stored at 4°C. Diluted solutions and mixtures were made in MeOH:H₂O 1:1, (v:v).

MS-grade solvents used for UPLC analysis acetonitrile (MeCN) water (H₂O) and formic acid (HCOOH) were provided by Romil (Cambridge, UK); analytical-grade solvents methanol (MeOH) and ethanol (EtOH) were supplied by Sigma-Aldrich (Milan, Italy). H₂O was purified by using a Milli-Q system (Millipore, Bedford, USA). Acetic acid (AA), ammonium hydroxide, naphthylethylene diamine dihydrochloride, phosphoric acid, ascorbic acid, fluorescein sodium salt, Trizma hydrocloride (Tris-HCl) monopotassium phosphate dipotassium phosphate, sodium nitroprusside dehydrate (SNP), sulphanilamide were provided by Sigma-Aldrich (Milan, Italy). 2,2-azobis(2-amidinopropane) dihydrochloride (AAPH) were purchased from TCI Chemicals (Tokyo, Japan). Glucoarabinin potassium salt, glucocamelin potassium salt and homoglucocamelinin potassium salt were purchased from Extrasynthese (Lyion, France).