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Determination by HPLC-UV of diacetyl and 2,3-pentanedione during beer fermentation after separation in a gas diffusion module

机译:在气体扩散模块中分离后啤酒发酵期间二乙酰和2,3-戊酰胺的HPLC-UV测定

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Diacetyl and 2,3-pentanedione (vicinal diketones, VDKs) are known to be important flavour compounds present in beer. In brewing industry the characteristic buttery taste of diacetyl has long been a major organoleptic problem. Human taste threshold for diacetyl in beer is very low (0.05-0.10 mg/l). 2,3-Pentanedione has a taste threshold higher than diacetyl (near 1.0 mg/l). During beer maturation the levels of diacetyl and 2,3-pentanedione are reduced and these levels are considered an important condition for estimating the maturity level of a beer. The analysis of these compounds during beer fermentation is challenging due to its low levels, interferences from matrix and the need to quickly convert all VDK's precursors, i.e., alfa-acetolactate and alfa-acetohydroxybutyrate.
机译:已知二乙酰和2,3-戊酰胺(邻酮,Vdks)是啤酒中存在的重要风味化合物。在酿造产业中,糖尿基的特色黄油味道长期以来一直是一个主要的感官问题。啤酒中二乙酰的人类味道阈值非常低(0.05-0.10 mg / L)。 2,3-戊酰胺的味道阈值高于二乙酰基(接近1.0mg / L)。在啤酒成熟期间,减少了二乙酰和2,3-戊酰基的水平,这些水平被认为是估计啤酒成熟度水平的重要条件。由于其低水平,基质的干扰以及快速转化所有VDK的前体,即Alfa-乙酰酸酯和Alfa-乙酰羟基巴丁酸酯,对这些化合物的分析是挑战性的。

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