scholarly journals Analytical system for carbon stable isotope measurements of light non-methane hydrocarbons

2011 ◽  
Vol 4 (1) ◽  
pp. 101-133 ◽  
Author(s):  
A. Zuiderweg ◽  
R. Holzinger ◽  
T. Röckmann
Keyword(s):  
Stable Isotope ◽  
Isotope Analysis ◽  
Ambient Air ◽  
Oxidative Capacity ◽  
Stable Isotope Ratio ◽  
Automated System ◽  
Medium Size ◽  
Carbon Stable Isotope ◽  
Inlet System ◽  
Trace Species

Abstract. Isotope analysis can be a useful tool in constraining the budgets (sources and sinks) of atmospheric trace species and is increasingly applied for organic constituents. This may be useful in particular for investigating the oxidative capacity of the atmosphere and studying long-range. We present setup, testing and initial results from a new automated system for carbon stable isotope ratio measurements on C2 to C6 atmospheric hydrocarbons. The inlet system is flexible and allows analysis of trace gases from medium size to very large ambient air samples (5–300 L) without loss of compounds of interest. The first application of this system was the analysis of ambient air during a short campaign in August 2009 in Utrecht, the Netherlands. Results obtained agree well with previous research, but highlight the complex diurnal behavior of hydrocarbons in an urban environment.

Differentiation of Pigment in Eggs Using Carbon (13C/12C) and Nitrogen (15N/14N) Stable Isotopes

2016 ◽  
Vol 99 (4) ◽  
pp. 1032-1037
Author(s):  
Feng M Sun ◽  
Guang Y Shi ◽  
Hui W Wang
Keyword(s):  
Stable Isotope ◽  
Isotope Analysis ◽  
Stable Isotope Ratio ◽  
Strong Positive Correlation ◽  
Carbon Stable Isotope ◽  
Δ13c And Δ15n ◽  
Δ13c Values ◽  
Isotope Ratio Analysis ◽  
Stable Isotope Ratio Analysis ◽  
Yellow Pigments

Abstract Consumers prefer natural and healthy food, but artificial pigments are often abused in egg products. The study aimed at differentiating the origin of pigments in eggs by applying the technique of carbon (13C/12C) and nitrogen (15N/14N) stable isotope analysis. Five hundred sixty laying hens were randomly distributed into 14 treatments, which were divided into four groups: maize, carophyll red pigment, carophyll yellow pigment, and a mixture of carophyll red and yellow pigments. Eggs were collected and pretreated to determe the values of the Roche Yolk Color Fan (RCF), δ13C, and δ15N. With increasing maize content, the RCF and δ13C values of yolks increased. Moreover, the RCF values in the three pigment groups were significantly influenced by the artificial colors, but δ13C values were not significantly different, regardless of the existence of pigment. The δ15N values in all treatments did not vary as regularly as the carbon stable isotope. A strong positive correlation was found between RCF and δ13C in the maize group, but no such correlation was be observed in the pigment groups. It is concluded that carbon stable isotope ratio analysis (δ13C) of the yolk can be used to differentiate the origin of the pigment added to eggs.

Detection of corn oil in adulterated olive and soybean oil by carbon stable isotope analysis

2017 ◽  
Vol 12 (3) ◽  
pp. 201-208 ◽  
Author(s):  
Jingyu Huang ◽  
Eyram Norgbey ◽  
Philip N. Nkrumah ◽  
Prince A. Opoku ◽  
Theresa O. Apreku
Keyword(s):  
Stable Isotope ◽  
Soybean Oil ◽  
Stable Isotope Analysis ◽  
Corn Oil ◽  
Isotope Analysis ◽  
Carbon Stable Isotope

Determination of glycerol carbon stable isotope ratio for the characterization of Italian balsamic vinegars

2018 ◽  
Vol 69 ◽  
pp. 33-38
Author(s):  
Simona Sighinolfi ◽  
Ilaria Baneschi ◽  
Simona Manzini ◽  
Lorenzo Tassi ◽  
Luigi Dallai ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Isotope Ratio ◽  
Stable Isotope Ratio ◽  
Carbon Stable Isotope ◽  
Carbon Stable Isotope Ratio
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