Reference

Phenolic extraction curves for white wine aged in French and American oak barrels

Phenolic extraction curves for white wine aged in French and American oak barrels. Rous, C.; Alderson, B. (Robert Mondavi Winery-Woodbridge, Woodbridge, CA 95258, USA). Am. J. Enol. Vitic., 34(4), 211-15 (English) 1983. CODEN: AJEVAC. ISSN: 0002-9254. DOCUMENT TYPE: Journal CA Section: 16 (Fermentation and Bioindustrial Chemistry) Barrels made by the same cooperage firm from French and American wood were put into a study to measure total and nonflavonoid phenolic extn. over time. This expt. was conducted over 3 fill and empty cycles of the barrel, using white wine. The residence time in the barrels was short, 12 and 16 wk of the 1st and 2nd fills, resp.; while the 3rd fill barrels' aging time was 6 mo. The differences between the French and American woods are dramatic on the 1st fill, but become less dramatic each fill thereafter. The data, when graphed, show a power curve for the 1st and 2nd fill barrels indicating diffusion kinetics, but by the 3rd fill, the plot is linear, indicating hydrolysis kinetics. The tasting data show that in spite of the anal. similarities after the 1st fill, tasters could distinguish between French and American wood even through the 3rd fill.

Phenol as an autocatalyst in the decomposition of cumene hydroperoxide

Phenol as an autocatalyst in the decomposition of cumene hydroperoxide. Broetz, Walter; Schoenbucher, Axel; Schoenbucher, Bernhard; Kick, Thomas (Inst. Tech. Chem., Univ. Stuttgart, Stuttgart 7000/80, Fed. Rep. Ger.). Chem.-Ing.-Tech., 55(12), 974-5 (German) 1983. CODEN: CITEAH. ISSN: 0009-286X.There are some commonly used reagents with their cas registry numbers 108-95-2 and 80-15-9 in this article. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) The decompn. of cumene hydroperoxide in an acetone-H2SO4 medium to form phenol and acetone was 2nd order in phenol concn. An activation energy of 86.6 kJ/mol was detd. .