furfural

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Related to furfurals: furfuraldehyde

fur·fu·ral

(fŭr'fyūr-ăl),
A colorless, aromatic, irritating fluid obtained in the distillation of bran with dilute sulfuric acid; used in the manufacture of medicinal agents.
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The ETS analysis found the Gamba barrel skewed dramatically to the sweet oak and butterscotch edge of the spectrum, with high amounts of 5-methylfurfural and furfural and moderate (or about average) amounts of the lactone compounds.
Exploring French Oak and Napa Cabernet: In blind tasting, a winemaker gets help evaluating barrels with sensory and objective lab analysis
While Figure 1 does not show an analysis for wine cubes, it is interesting to note the differences in furfural content (butterscotch, caramel aromas) or the cube heavy toast reported by Nadalie.
The art of oak: part 2: use of oak alternatives in modern winemaking
Two aldehyde signals prove that there are two furfural groups.
Pyrolysis of table sugar
A high level emission of furfural was detected in sample 1 and 2 indicating a thermal degradation of hemicellulose.
Emission of volatile organic compounds from softwood pellets during storage

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