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| - Yield Effects on 2-Methoxy-3-Isobutylpyrazine Concentration inCabernet Sauvignon Using a Solid Phase Microextraction GasChromatography/Mass Spectrometry Method
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| - A rapid and automated solid phase microextraction (SPME) stable isotope dilution gas chromatography/mass spectrometry (GC-MS) method for 2-methoxy-3-isobutylpyrazine (MIBP) quantificationin red wine was developed. Wines with 30% (w/v) NaCl and 2-methoxy-2H3-3-isobutylpyrazine internalstandard were sampled with a 2 cm divinylbenzene/carboxen/poly(dimethylsiloxane) SPME fiber for30 min at 40 °C and analyzed by GC-MS. The method was used to measure MIBP concentrationsin Cabernet Sauvignon wines that were produced from six winter pruning treatments over two vintages.MIBP concentrations were significantly negatively correlated with buds per vine. In addition, the MIBPconcentration was directly related to sensory vegetal intensity ratings obtained by descriptive analysis. Keywords: 2-Methoxy-3-isobutylpyrazine; headspace solid phase microextraction; sensory evaluation;canopy management
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