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Gas chromatographic‐mass spectrometric examination of aroma extracts from both Ruby and Tawny port has led to the identification of 141 components, notably 2‐methoxyphenol, dihydro‐2‐(3H)‐furanone, β‐methyl‐γ‐octalactone, cis‐4‐hydroxy‐methyl‐2‐methyl‐l,3‐dioxolane, ethyl pyroglutamate and vitispirane. Odour evaluation of the components separated by gas chromatography indicates five regions as being of potential importance in port. 2‐Methoxyphenol and dihydro‐2‐(3H)‐furanone were found in two of these regions, three others being associated with esters of succinic acid. None of these components can, however, wholly explain the port‐like odour.
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Williams et al. (1983) studied this question.
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