Gas-Phase Analysis of Trimethylamine, Propionic and Butyric Acids, and Sulfur Compounds Using Solid-Phase Microextraction

2002 ◽  
Vol 74 (5) ◽  
pp. 1054-1060 ◽  
Author(s):  
Hyunook Kim ◽  
Cristina Nochetto ◽  
Laura L. McConnell
Keyword(s):  
Gas Phase ◽  
Phase Analysis ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Sulfur Compounds

scholarly journals Volatile Terpenes and Terpenoids from Workers and Queens of Monomorium chinense (Hymenoptera: Formicidae)

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2838 ◽  
Author(s):  
Rui Zhao ◽  
Lihua Lu ◽  
Qingxing Shi ◽  
Jian Chen ◽  
Yurong He
Keyword(s):  
Mass Spectrometry ◽  
Gas Phase ◽  
Solid Phase Microextraction ◽  
De Novo ◽  
Solid Phase ◽  
Mandibular Glands ◽  
Headspace Solid Phase Microextraction ◽  
Unknown Structure ◽  
Volatile Terpenes

Twenty-one volatile terpenes and terpenoids were found in Monomorium chinense Santschi (Hymenoptera: Formicidae), a native Chinese ant, by using headspace solid-phase microextraction (HS-SPME) coupled with gas-phase chromatography and mass spectrometry (GC-MS), which makes this ant one of the most prolific terpene producers in insect. A sesquiterpene with unknown structure (terpene 1) was the main terpene in workers and neocembrene in queens. Terpenes and terpenoids were detected in poison, Dufour’s and mandibular glands of both workers and queens. Worker ants raised on a terpene-free diet showed the same terpene profile as ants collected in the field, indicating that de novo terpene and terpenoid synthesis occurs in M. chinense.

scholarly journals Effect of Wine Matrix Composition on the Quantification of Volatile Sulfur Compounds by Headspace Solid-Phase Microextraction-Gas Chromatography-Pulsed Flame Photometric Detection

Molecules ◽  
2019 ◽  
Vol 24 (18) ◽  
pp. 3320 ◽  
Author(s):  
Peter M. Davis ◽  
Michael C. Qian
Keyword(s):  
Solid Phase Microextraction ◽  
Matrix Effects ◽  
Solid Phase ◽  
Sulfur Compounds ◽  
Volatile Components ◽  
Volatile Sulfur Compounds ◽  
Photometric Detection ◽  
Flame Photometric Detection ◽  
Wine Matrix ◽  
Volatile Sulfur

The analysis of volatile sulfur compounds using headspace solid-phase microextraction (HS-SPME) is heavily influenced by matrix effects. The effects of a wine matrix, both non-volatile and volatile components (other than ethanol) were studied on the analysis of several common sulfur volatiles found in wine, including hydrogen sulfide (H2S), methanethiol (MeSH), dimethyl sulfide (DMS), dimethyl disulfide (DMDS), dimethyl trisulfide (DMTS), diethyl disulfide (DEDS), methyl thioacetate (MeSOAc), and ethyl thioacetate (EtSOAc). Varying levels of devolatilized wine and common wine volatiles (acids, esters, alcohols) were added to synthetic wine samples to act as matrices. Sulfur standards were added and analyzed using gas chromatography with pulsed-flame photometric detection (GC-PFPD). Five internal standards were used to find best representatives of each compound despite matrix effects. Sensitivity remained stable with the addition of devolatilized wine, while addition of volatile components decreased sensitivity. DMS was found to be best measured against EMS; DMDS and the thioacetates were best measured against DES; H2S, MeSH, DEDS, and DMTS were best measured against DIDS. The method was used to quantitate the volatile sulfur compounds in 21 wines with various ethanol contents and volatile profiles.

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