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  • Trace level analysis of corky off-flavor compounds: development of a new analytical method based on solid phase extraction and analysis by multidimensional gas chromatography with mass spectrometric detection.

Trace level analysis of corky off-flavor compounds: development of a new analytical method based on solid phase extraction and analysis by multidimensional gas chromatography with mass spectrometric detection.

Journal of chromatography. A (2011-11-08)
Hans-Georg Schmarr, Stefan Koschinski, Wei Sang, Petra Slabizki
ABSTRACT

This work describes the development of a trace level (<1 ngL(-1)) analysis of haloanisoles in complex wine matrix. The suggested method involves sample preparation based on solid phase extraction, a clean-up to remove acidic compounds, concentration of the haloanisole fraction and large volume on-column injection into a multidimensional GC-MS system. Mass spectrometric detection in the selected ion mode allowed reliable quantification of 2,4,6-trichloroanisole (TCA) or 2,4,6-tribromoanisole (TBA), via their highly deuterated ([(2)H5]) isotopologues as internal standards (stable isotope dilution analysis; SIDA), which had prior been synthesized in house. The development of this new method had become necessary, as a one-dimensional HS-SPME-GC-ECD method, routinely applied for analysis of TCA in cork soaks, had to be extended for TeCA and TBA determination, but failed due to co-elutions within wine matrices. The newly developed SPE//MDGC-MS method provided detection limits well below olfactory thresholds of the analytes with 0.05 ngL(-1) (LOD), 0.19 ngL(-1) (LOQ) for TCA, 0.06 ngL(-1) (LOD), 0.21 ngL(-1) (LOQ) for TeCA, and 0.09 ngL(-1) (LOD), 0.34 ngL(-1) (LOQ) for TBA.

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Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 100 μm(PDMS, for use with manual holder, needle size 23 ga
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SPME Portable Field Sampler, coating PDMS
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Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 100 μm(PDMS, for use with autosampler, needle size 23 ga
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1 ea
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$1,460.00
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 100 μm(PDMS, for use with autosampler, needle size 24 ga
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SKUPack SizeAvailabilityPriceQuantity
1 ea
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$1,460.00
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), metal alloy fiber, df 100 μm(PDMS, needle size 23 ga, for use with autosampler
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SKUPack SizeAvailabilityPriceQuantity
1 ea
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$1,460.00
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 100 μm(PDMS, needle size 24 ga, for use with manual holder
Sign Into View Organizational & Contract Pricing
SKUPack SizeAvailabilityPriceQuantity
1 ea
Please contact Customer Service for Availability
$1,460.00