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Effect of Ethanol on the Adsorption of Volatile Sulfur Compounds on Solid Phase Micro-Extraction Fiber Coatings and the Implication for Analysis in Wine.
Molecules. 2019 Sep 18; 24(18)M

Abstract

Complications in the analysis of volatile sulfur compounds (VSC) in wine using solid-phase microextraction (SPME) arise from sample variability. Constituents of the wine matrix, including ethanol, affect the volatility and adsorption of sulfur volatiles on SPME fiber coatings (Carboxen- polydimethylsiloxane(PDMS); DVB-Carboxen-PDMS and DVB-PDMS), which can impact sensitivity and accuracy. Here, several common wine sulfur volatiles, 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) are analyzed, using SPME followed by gas chromatography (GC), using a system equipped with a pulsed-flame photometric detection (PFPD) system, at various ethanol concentrations in a synthetic wine matrix. Ethyl methyl sulfide (EMS), diethyl sulfide (DES), methyl isopropyl sulfide (MIS), ethyl isopropyl sulfide (EIS), and diisopropyl disulfide (DIDS) are evaluated as internal standards. The absorption of volatile compounds on the SPME fiber is greatly affected by ethanol. All compounds exhibit a stark decrease in detectability with the addition of ethanol, especially between 0.0 and 0.5% v/v. However, the ratio of interested sulfur compounds to the internal standard becomes more stable when the total alcohol concentration exceeds 2%. EMS was found to best resemble DMS. EIS and DES were found to best resemble DMDS, MeSOAc, and EtSOAc. DIDS was found to best resemble DEDS, DMTS, H2S, and MeSH.

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Authors+Show Affiliations

Davis PM
Department of Food Science & Technology, Oregon State University, Corvallis, OR 97331, USA. yungdoufu@gmail.com.
Qian MC
Department of Food Science & Technology, Oregon State University, Corvallis, OR 97331, USA. Michael.qian@oregonstate.edu. Oregon Wine Research Institute, Oregon State University, Corvallis, OR 97331, USA. Michael.qian@oregonstate.edu.

MeSH

EthanolSolid Phase ExtractionSulfur CompoundsVolatile Organic CompoundsWine

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31540469

Citation

Davis, Peter M., and Michael C. Qian. "Effect of Ethanol On the Adsorption of Volatile Sulfur Compounds On Solid Phase Micro-Extraction Fiber Coatings and the Implication for Analysis in Wine." Molecules (Basel, Switzerland), vol. 24, no. 18, 2019.
Davis PM, Qian MC. Effect of Ethanol on the Adsorption of Volatile Sulfur Compounds on Solid Phase Micro-Extraction Fiber Coatings and the Implication for Analysis in Wine. Molecules. 2019;24(18).
Davis, P. M., & Qian, M. C. (2019). Effect of Ethanol on the Adsorption of Volatile Sulfur Compounds on Solid Phase Micro-Extraction Fiber Coatings and the Implication for Analysis in Wine. Molecules (Basel, Switzerland), 24(18). https://doi.org/10.3390/molecules24183392
Davis PM, Qian MC. Effect of Ethanol On the Adsorption of Volatile Sulfur Compounds On Solid Phase Micro-Extraction Fiber Coatings and the Implication for Analysis in Wine. Molecules. 2019 Sep 18;24(18) PubMed PMID: 31540469.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of Ethanol on the Adsorption of Volatile Sulfur Compounds on Solid Phase Micro-Extraction Fiber Coatings and the Implication for Analysis in Wine. AU - Davis,Peter M, AU - Qian,Michael C, Y1 - 2019/09/18/ PY - 2019/08/09/received PY - 2019/09/13/revised PY - 2019/09/17/accepted PY - 2019/9/22/entrez PY - 2019/9/22/pubmed PY - 2020/2/6/medline KW - GC-PFPD KW - SPME KW - volatile sulfur compounds KW - wine JF - Molecules (Basel, Switzerland) JO - Molecules VL - 24 IS - 18 N2 - Complications in the analysis of volatile sulfur compounds (VSC) in wine using solid-phase microextraction (SPME) arise from sample variability. Constituents of the wine matrix, including ethanol, affect the volatility and adsorption of sulfur volatiles on SPME fiber coatings (Carboxen- polydimethylsiloxane(PDMS); DVB-Carboxen-PDMS and DVB-PDMS), which can impact sensitivity and accuracy. Here, several common wine sulfur volatiles, 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) are analyzed, using SPME followed by gas chromatography (GC), using a system equipped with a pulsed-flame photometric detection (PFPD) system, at various ethanol concentrations in a synthetic wine matrix. Ethyl methyl sulfide (EMS), diethyl sulfide (DES), methyl isopropyl sulfide (MIS), ethyl isopropyl sulfide (EIS), and diisopropyl disulfide (DIDS) are evaluated as internal standards. The absorption of volatile compounds on the SPME fiber is greatly affected by ethanol. All compounds exhibit a stark decrease in detectability with the addition of ethanol, especially between 0.0 and 0.5% v/v. However, the ratio of interested sulfur compounds to the internal standard becomes more stable when the total alcohol concentration exceeds 2%. EMS was found to best resemble DMS. EIS and DES were found to best resemble DMDS, MeSOAc, and EtSOAc. DIDS was found to best resemble DEDS, DMTS, H2S, and MeSH. SN - 1420-3049 UR - https://www.unboundmedicine.com/medline/citation/31540469/Effect_of_Ethanol_on_the_Adsorption_of_Volatile_Sulfur_Compounds_on_Solid_Phase_Micro_Extraction_Fiber_Coatings_and_the_Implication_for_Analysis_in_Wine_ DB - PRIME DP - Unbound Medicine ER -
Grapherence [↓2 ↑8]

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