title: Rapid Method for the Determination of the Stable Oxygen Isotope Ratio of Water in Alcoholic Beverages.
abstract: This paper demonstrates the first successful application of an online pyrolysis technique for the direct determination of oxygen isotope ratios (δ(18)O) of water in alcoholic beverages. Similar water concentrations in each sample were achieved by adjustment with absolute ethyl alcohol, and then a fixed GC split ratio can be used. All of the organic ingredients were successfully separated from the analyte on a CP-PoraBond Q column and subsequently vented out, whereas water molecules were transferred into the reaction furnace and converted to CO. With the system presented, 15-30 μL of raw sample was diluted and can be analyzed repeatedly; the analytical precision was better than 0.4‰ (n = 5) in all cases, and more than 50 injections can be made per day. No apparent memory effect was observed even if water samples were injected using the same syringe; a strong correlation (R(2) = 0.9998) was found between the water δ(18)O of measured sample and that of working standards. There was no significant difference (p > 0.05) between the mean δ(18)O value and that obtained by the traditional method (CO2-water equilibration/isotope ratio mass spectrometry) and the newly developed method in this study. The advantages of this new method are its rapidity and straightforwardness, and less test portion is required.
authors.affiliation: China National Research Institute of Food and Fermentation Industries , Beijing 100015, China.|School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing) , Beijing 100083, China.
authors.forename: Daobing
authors.initials: D
authors.lastname: Wang
authors.affiliation: China National Research Institute of Food and Fermentation Industries , Beijing 100015, China.
authors.forename: Qiding
authors.initials: Q
authors.lastname: Zhong
authors.affiliation: China National Research Institute of Food and Fermentation Industries , Beijing 100015, China.
authors.forename: Guohui
authors.initials: G
authors.lastname: Li
authors.affiliation: School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing) , Beijing 100083, China.
authors.forename: Zhanbin
authors.initials: Z
authors.lastname: Huang
mesh_terms: D000434:Alcoholic Beverages / Q000032:analysis*; D013058:Mass Spectrometry / Q000379:methods*; D010103:Oxygen Isotopes / Q000032:analysis*; D014867:Water / Q000737:chemistry*
chemical_list: D010103:Oxygen Isotopes; D014867:Water
keywords: alcoholic beverage; pyrolysis; stable oxygen isotope ratio; water