Measurement of octanol–air partition coefficients for liquid crystals based on gas chromatography-retention time and its implication in predicting long-rang transport potential

Abstract A positive bias in the gas chromatographic (GC) analysis of butter for β-sitosterol was discovered when attempting to confirm values by gas chromatography/mass spectrometry (GC/MS). The source of the problem was traced to an interfering material that was not effectively separated by packed column GC. Because capillary columns are known to provide superior separation, they were substituted for packed columns in the assay, and instrument parameters were modified accordingly. A compound with a similar retention time, identified by GC/MS as lanosterol, was separated from β-sitosterol by the capillary column. The capillary column technique was applied to over 300 butter samples. The results indicate that the method can accurately quantitate β-sitosterol in butter with no known interferences. The limit of detection for this method is 1 mg/100 g. Recoveries at a level of 3 mg/100 g averaged 98% with a coefficient of variation of 3.45%

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Determination of Residual Solvents in Pharmaceuticals by Static Headspace Gas Chromatography Using Natural Deep Eutectic Solvents as Mediums: A Partition Coefficients Study

Chromatographia ◽

10.1007/s10337-019-03775-0 ◽

2019 ◽

Vol 82 (10) ◽

pp. 1523-1529 ◽

Cited By ~ 2

Author(s):

Wei Zhang ◽

Sheng Fang ◽

Xianrui Liang

Keyword(s):

Gas Chromatography ◽

Partition Coefficients ◽

Deep Eutectic Solvents ◽

Headspace Gas Chromatography ◽

Static Headspace ◽

Residual Solvents ◽

Static Headspace Gas Chromatography ◽

Natural Deep Eutectic Solvents ◽

Headspace Gas

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Simultaneous determination of partition coefficients and acidity constants of chlorinated phenols and gualacols by gas chromatography

Analytica Chimica Acta ◽

10.1016/s0003-2670(00)84505-5 ◽

1984 ◽

Vol 160 ◽

pp. 21-30 ◽

Cited By ~ 34

Author(s):

T.M Xie ◽

D Dyrssen

Keyword(s):

Gas Chromatography ◽

Simultaneous Determination ◽

Partition Coefficients ◽

Chlorinated Phenols ◽

Acidity Constants

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Static Headspace Analysis Using Low-Pressure Gas Chromatography and Mass Spectrometry, Application to Determining Multiple Partition Coefficients: A Practical Tool for Understanding Red Wine Fruity Volatile Perception and the Sensory Impact of Higher Alcohols

Analytical Chemistry ◽

10.1021/acs.analchem.8b01896 ◽

2018 ◽

Vol 90 (18) ◽

pp. 10812-10818 ◽

Cited By ~ 5

Author(s):

Margaux Cameleyre ◽

Georgia Lytra ◽

Jean-Christophe Barbe

Keyword(s):

Mass Spectrometry ◽

Gas Chromatography ◽

Partition Coefficients ◽

Red Wine ◽

Headspace Analysis ◽

Higher Alcohols ◽

Static Headspace ◽

Practical Tool ◽

Static Headspace Analysis ◽

Mass Spectrometry Application

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Estimation and Identification of Turpentine in Multi-Component Mixtures: Identification of Pure Turpentine

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/49.4.749 ◽

1966 ◽

Vol 49 (4) ◽

pp. 749-755

Author(s):

Wilbur L Saxton

Keyword(s):

Gas Chromatography ◽

Retention Time ◽

Steam Distillation ◽

Commercial Products ◽

Value Recovery ◽

The Mean ◽

The U.S

Abstract Turpentine is separated from multi-component products by steam distillation, quantitatively determined by a titrimetric bromination, and identified by gas chromatography of the brominated product. The method is satisfactory for each of the three types of turpentine produced in the U.S. but does not distinguish among them. Twenty-five samples of turpentine, representing the three main types, obtained from various sources, were assayed by the proposed method to determine range of titration value and the mean titration value. Recovery of turpentine from three products containing known added amounts were 83, 100, and 104%. The 25 samples of turpentine and 10 samples of commercial products known to contain turpentine all gave similar gas chromatographic curves. Curves show that a combination of peaks lying between 0.5 and 0.85 retention time (relative to aldrin) can be used to identify turpentine.

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