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Headspace Gas Chromatography–Flame Ionization Detector Analysis for Beer Volatiles

1. Repeatability and reproducibility coefficients of variation for the determination of acetaldehyde by headspace gas chromatography–flame ionization detector (GC-FID) analysis ranged from 0.70 to 12% and 14 to 28%, respectively, and were judged unacceptable. 2. Repeatability and reproducibility coefficients of variation for the determination of ethyl acetate by headspace GC-FID analysis ranged from 0.96 to 4.3% and 8.2 to 8.9%, respectively, and were judged acceptable. 3. Repeatability coefficients of variation for the determination of isoamyl acetate by headspace GC-FID analysis ranged from 0.42 to 10% and were judged acceptable. Reproducibility coefficients of variation for the determination of isoamyl acetate by headspace GC-FID analysis ranged from 14 to 32% and were judged unacceptable. 4. Repeatability and reproducibility coefficients of variation for the determination of isoamyl alcohol by headspace GC-FID analysis ranged from 3.9 to 12% and 12 to 18%, respectively, and were judged unacceptable.