Estimation of normal boiling points of trialkyl phosphates using retention indices by gas chromatography

2010 ◽  
Vol 511 (1-2) ◽  
pp. 107-111 ◽  
Author(s):  
K. Panneerselvam ◽  
M.P. Antony ◽  
T.G. Srinivasan ◽  
P.R. Vasudeva Rao
Keyword(s):  
Gas Chromatography ◽  
Retention Indices ◽  
Boiling Points ◽  
Trialkyl Phosphates

Gas-Cycle-Assisted Headspace Solid-Phase Microextraction Coupling with Gas Chromatography for Rapid Analysis of Organic Pollutants

2021 ◽  
Author(s):  
Wenli Zhu ◽  
Peige Qin ◽  
Lizhen Han ◽  
Xiaowan Zhang ◽  
Dan Li ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Organic Pollutants ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Rapid Analysis ◽  
Headspace Solid Phase Microextraction ◽  
Boiling Points

Herein, a new gas-cycle-assisted (GCA) headspace solid-phase microextraction (HS-SPME) device was designed to rapidly extract organic pollutants with high Kow and boiling points that have difficulty in volatilization from matrix...

scholarly journals Investigations on the Key Odorants Contributing to the Aroma of Children Soy Sauce by Molecular Sensory Science Approaches

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1492
Author(s):  
Jia Huang ◽  
Haitao Chen ◽  
Zhiming Zhang ◽  
Yuping Liu ◽  
Binshan Liu ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Solid Phase ◽  
Internal Standard ◽  
Retention Indices ◽  
Soy Sauce ◽  
Gas Chromatography Mass Spectrometry ◽  
Volatile Components ◽  
Active Compounds ◽  
Standard Curve ◽  
Key Odorants

To investigate the key odor-active compounds in children’s soy sauce (CSS), volatile components were extracted by means of solvent extraction coupled with solvent-assisted flavor evaporation (SE-SAFE) and solid-phase microextraction (SPME). Using gas chromatography-olfactometry (GC-O) and gas chromatography-mass spectrometry (GC-MS), we identified a total of 55 odor-active compounds in six CSSs by comparing the odor characteristics, MS data, and retention indices with those of authentic compounds. Applying aroma extract dilution analysis (AEDA), we measured flavor dilution (FD) factors in SE-SAFE isolates, ranging from 1 to 4096, and in SPME isolates, ranging from 1 to 800. Twenty-eight odorants with higher FD factors and GC-MS responses were quantitated using the internal standard curve method. According to their quantitated results and thresholds in water, their odor activity values (OAVs) were calculated. On the basis of the OAV results, 27 odorants with OAVs ≥ 1 were determined as key odorants in six CSSs. These had previously been reported as key odorants in general soy sauce (GSS), so it was concluded that the key odorants in CSS are the same as those in GSS.

scholarly journals Wild Thymbra Capitata from Western Rif (Morocco): Essential Oil Composition, Chemical Homogeneity and Yield Variability

2013 ◽  
Vol 8 (8) ◽  
pp. 1934578X1300800 ◽  
Author(s):  
Khadija Bakhy ◽  
Ouafae Benlhabib ◽  
Chaouki Al Faiz ◽  
Ange Bighelli ◽  
Joseph Casanova ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Retention Indices ◽  
Essential Oil Composition ◽  
Gas Chromatography Mass Spectrometry ◽  
Yield Variability ◽  
Oil Composition ◽  
Chemical Homogeneity ◽  
Quantitative Characteristics ◽  
C Nmr

Essential oils (EO, 15 collective samples and 47 individual samples) of Thymbra capitata collected from Moroccan Western Rif were analyzed using gas chromatography (GC) in combination with retention indices (RI), gas chromatography-mass spectrometry (GC-SM) and 13C NMR spectroscopy. Twenty components were identified. Carvacrol (68.2%–85.9 %) was by far the major component of all the samples, while the content of thymol (0.1-0.3%) was very low. Other components present in appreciable amounts were γ-terpinene (up to 8.9%), p-cymene (up to 7.1%), linalool (up to 4.4%) and ( E)- β-caryophyllene (up to 4.1%). In contrast, the yield of EO varied drastically from sample to sample (0.5–3.7%). No correlation could be established between yield of EO and altitude, pH, chemical composition and granularity of the soil. Cultivation under controlled conditions is suggested to improve the quantitative characteristics of carvacrol-rich Moroccan T. capitata.

Improving the accuracy of Kováts’ retention indices in isothermal gas chromatography

2002 ◽  
Vol 945 (1-2) ◽  
pp. 185-194 ◽  
Author(s):  
Rosa Lebrón-Aguilar ◽  
Jesús Eduardo Quintanilla-López ◽  
José Antonio Garcı́a-Domı́nguez
Keyword(s):  
Gas Chromatography ◽  
Retention Indices ◽  
Kováts Retention Indices ◽  
Isothermal Gas
Sign in / Sign up

Export Citation Format

Share Document