无萃取过程测量饮料中水稳定性同位素
2017-11-22 15:03
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Analysis of the hydrogen and oxygen stable isotope ratios of beverage waters without prior water extraction using isotope ratio infrared spectroscopy
Hydrogen (d2H) and oxygen (d18O) stable isotope analysis is useful when tracing the origin of water in beverages, but traditional analytical techniques are limited to pure or extracted waters. We measured the isotopic composition of extracted beverage water using both isotope ratio infrared spectroscopy
(IRIS; specifically, wavelength-scanned cavity ring-down spectroscopy) and isotope ratio mass spectrometry (IRMS). We also analyzed beer, sodas, juices, and milk ‘as is’ using IRIS. For IRIS analysis, four sequential injections of each sample were measured and data were corrected for sample-to-sample memory using injections (a) 1-4, (b) 2-4, and (c) 3-4. The variation between d2H and d18O values calculated using the three correction methods was larger for unextracted (i.e., complex) beverages than for waters. The memory correction was smallest when using injections 3-4. Beverage water d2H and d18O values generally fit the Global Meteoric Water Line, with the exception of water from fruit juices. The beverage water stable isotope ratios measured using IRIS agreed well with the IRMS data and fit 1:1 lines, with the exception of sodas and juices (d2H values) and beers (d18O values). The d2H and d18O values of waters extracted from beer, soda, juice, and milk were correlated with complex beverage d2H and d18O values (r¼0.998 and 0.997, respectively) and generally fit 1:1 lines. We conclude that it is possible to analyze complex beverages, without water extraction, using IRIS although caution is needed when analyzing beverages containing sugars, which can clog the syringe and increase memory, or alcohol, a known spectral interference.
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4月9日-11日在北京举办“2017年同位素水文与生态环境应用研讨会”,同时也是普瑞亿科第六届同位素技术培训班,目的是交流与研讨环境同位素分析测试的新技术和数据解释的新方法,以及在水文和生态环境领域的应用新进展。本次活动分为研讨会和培训班两部分日程。欢迎从事相关领域的科研、教学和生产应用的学者和研究生们参加研讨和培训。
4月9日-11日在北京举办“2017年同位素水文与生态环境应用研讨会”,同时也是普瑞亿科第六届同位素技术培训班,目的是交流与研讨环境同位素分析测试的新技术和数据解释的新方法,以及在水文和生态环境领域的应用新进展。本次活动分为研讨会和培训班两部分日程。欢迎从事相关领域的科研、教学和生产应用的学者和研究生们参加研讨和培训。
4月9日-11日在北京举办“2017年同位素水文与生态环境应用研讨会”,同时也是普瑞亿科第六届同位素技术培训班,目的是交流与研讨环境同位素分析测试的新技术和数据解释的新方法,以及在水文和生态环境领域的应用新进展。本次活动分为研讨会和培训班两部分日程。欢迎从事相关领域的科研、教学和生产应用的学者和研究生们参加研讨和培训。
尊敬的老师:
2017年,北京普瑞亿科科技有限公司制定了以同位素技术为核心,以自主研发为辅,致力于同位素分析仪的推广和销售、同位素分析测试服务、同位素培训计划的战略部署。基于该战略部署和前五届同位素技术应用培训班的反馈,北京普瑞亿科科技有限公司将联手美国Thermo Fisher、美国PerkinElmer公司、美国Picarro公司以及美国Arrow Grand Technologies公司共同举办第六届同位素技术应用培训班,现定于2017年4月9日-11日在北京举办。我们寄希望通过举办此类会议,打造行业内的同位素技术交流平台,真正为国内科学家提供一个互动交流的机会,以推进同位素的发展及其衍生技术的成果转化。秉承做精做专的一贯信念,我们此次也邀请到同位素研究领域的大师们来进行交流,特邀您参加。