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Reproducibility of headspace analysis of wines



Reproducibility of headspace analysis of wines



Journal of Agricultural & Food Chemistry 27(2): 450-452



Wine headspace volatiles, collected by displacement onto a Tenax GC adsorbent trap by a modification of the procedure described by Noble (1978), were analyzed quantitatively by gas chromatography (GC). Triplicate analyses were made using 2 displacement end points, and the reproducibility of the 2 procedures was evaluated by calculation of the coefficients of variation (CV) of the peak areas. Of the 48 peaks quantified, 60% had a CV less than 0.30, with 21-25% having CV less than 0.10. Small peaks consistently showed the poorest reproducibility. CV for the larger peaks, ranging from 0.010-0.077, were similar to those reported by Stenroos et al. (1976) in the GC analysis of beer volatile extracts. Variation in the displacement end point did not significantly affect the reproducibility of the procedure; both sets of data represented a significant improvement in reproducibility over the results reported previously by Noble (1978).

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Accession: 006315182

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DOI: 10.1021/jf60222a030


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