Gas Chromatography−Multiplex Coherent Raman Spectroscopy

Chen, Peter C.; Joyner, Candace C.; Patrick, Sheena T.; Royster, Rebecca M.; Ingham, Leigha L.

doi:10.1021/ac0207123

Cited by 8 publications

(7 citation statements)

References 29 publications

(42 reference statements)

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“…2 and is similar to that described in Ref. 13, with a few minor changes. The GC (SRI model 8610c, Torrance, CA) was equipped with an OPTIC 3 injection system (ATAS GL, Veldhoven, The Netherlands) that was used in splitless mode.…”

Section: Methodssupporting

confidence: 86%

“…The GC-MCR technique investigated here uses the nonlinear optical effect to increase the size of the Raman signal, which results in the ability to generate spectra quickly for realtime analysis. 13 In nonlinear Raman spectroscopy (also known as coherent Raman spectroscopy, or CARS), three input beams are focused into the sample and the Raman signal is generated in the form of an intense beam. In the system used in this work, one input beam comes from a frequencydoubled Nd:YAG laser (532 nm) and the other two beams are produced by a single broadband optical parametric oscillator.…”

Section: Introductionmentioning

confidence: 99%

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High-Speed Gas Chromatography—Multiplex Coherent Raman Analysis of BTEX

et al. 2005

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Gas chromatography–multiplex coherent Raman (GC-MCR) is a new tandem technique that can be used for the high-speed analysis of volatile mixtures. BTEX serves as a useful and challenging test sample because of the similarity in boiling point and spectroscopic properties of its constituents. The ability to spectroscopically resolve isomers (e.g., m-xylene and p-xylene) allows GC-MCR to sacrifice chromatographic resolution for speed. The result is the analysis of BTEX in less than 5 min, which is relatively fast compared with other tandem GC techniques.

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Section: Methodssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

High-Speed Gas Chromatography—Multiplex Coherent Raman Analysis of BTEX

et al. 2005

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“…7 Although GC is a highly sensitive and efficient method to determine the ingredients in compounds, sample preparation and separation is time-consuming. 8 Gas chromatography may not be suitable for many compounds due to the risk of system contamination and a reaction with the stationary phase in the column. Moreover, it is impossible for GC to detect water.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Detection of Ethanol/Acetone in Complex Solutions Using Raman Spectroscopy Based on Headspace Gas Analysis

et al. 2017

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This paper demonstrated the quantitative detection of ethanol and acetone mixtures in complex solutions with Raman spectroscopy based on headspace gas analysis. By analyzing the volatile components in the headspace, their concentrations in liquid solutions were determined. We constructed our own Raman spectroscopy system to detect the headspace gas quantitatively over a solution in a sealed vial. The Raman spectra of the headspace gases over standard solutions were standardized for finding the concentrations of ethanol, acetone, and ethanol-acetone in mixture solutions. The results showed that the concentration of a gaseous component in the headspace gas was proportional to its ratio in the liquid solution. We obtained a linear relationship between the spectral intensity of volatile components in headspace and the concentration of the liquid solutions. Then, we analyzed the alcohol concentration in a white wine and a Chinese liquor called Fen Chiew by measuring the Raman spectra of the headspace gas over their liquids. For the river water sample, we also implemented our headspace gas detection with Raman spectra to obtain the concentration of acetone in the river sample. This work demonstrated the facilitation of headspace gas analysis by the qualitative and quantitative determination of volatile substances from liquid samples using Raman spectroscopy.

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“…12 Not surprisingly, several attempts to develop a GC/Raman interface have been reported in the last 35 years. [13][14][15][16][17] In all cases, however, the detection limits were far higher than those of GC/FT-IR, let alone GC/MS.…”

Section: Introductionmentioning

confidence: 99%

Off-Line Direct Deposition Gas Chromatography/Surface-Enhanced Raman Scattering and the Ramifications for On-Line Measurements

Heaps

Griffiths

2005

Appl Spectrosc

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Surface-enhanced Raman spectra (SERS) of molecules separated by gas chromatography (GC) were measured off-line by condensing the analyte on a moving, liquid-nitrogen-cooled ZnSe window on which a 5 nm layer of silver had been formed by physical vapor deposition. After the components that eluted from the chromatograph had been deposited, the substrate was allowed to warm up to room temperature and transferred to the focus of a Raman microspectrometer where the spectrum of each component was measured. Band intensities in the spectrum of 3 ng of caffeine prepared in this way were approximately the same as in the spectrum of bulk caffeine. By making some logical assumptions, it was shown that identifiable GC/SERS spectra of 30 pg of many molecules could be measured over a 300 cm(-1) region in real-time and that if an optimized substrate were used the minimum identifiable quantity could be reduced to 1 pg or less.

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Gas Chromatography−Multiplex Coherent Raman Spectroscopy

Cited by 8 publications

References 29 publications

High-Speed Gas Chromatography—Multiplex Coherent Raman Analysis of BTEX

High-Speed Gas Chromatography—Multiplex Coherent Raman Analysis of BTEX

Quantitative Detection of Ethanol/Acetone in Complex Solutions Using Raman Spectroscopy Based on Headspace Gas Analysis

Off-Line Direct Deposition Gas Chromatography/Surface-Enhanced Raman Scattering and the Ramifications for On-Line Measurements

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