Hernandes, Karolina C. published the artcileMatrix-compatible solid phase microextraction coating improves quantitative analysis of volatile profile throughout brewing stages, Application of Ethyl octanoate, the main research area is beer polydimethylsiloxane divinylbenzene carboxen solid phase microextraction brewing; Aroma; Beer; DVB/Car/PDMS; Flavor; HS-SPME; Lager; PDMS-overcoated fiber; Polydimethylsiloxane.
Ethanol is the major matrix constituent of beer and has been reported as an important interfering volatile during headspace solid phase microextraction (HS-SPME) of minor compounds due to its displacement effect. The addition of a thin hydrophobic polydimethylsiloxane (PDMS) layer on a com. divinylbenzene/Carboxen/PDMS (DVB/Car/PDMS) fiber was evaluated, for the first time, to minimize the displacement effect caused by ethanol in the quant. determination of volatile profile of five stages of brewing. Anal. were performed through gas chromatog. coupled to mass spectrometry detector. The extractive capacity of the PDMS-overcoated fiber was superior to the com. analogous fiber, since the modified version extracted a greater number of compounds (61 vs. 45) and allowed to obtain 20% more of total chromatog. area than the com. fiber. The ethanol content of model solutions (0, 4, 8 and 12%) did not result in significant differences in responses neither to polar nor to medium polar or nonpolar analytes when PDMS-overcoated fiber was used. On the other hand, a displacement effect was observed when polar compounds were extracted by the com. fiber. There was no need to prepare different anal. curves with distinct ethanol levels close to those found in each brewing stage, when PDMS-overcoated fiber was used. This approach turns the anal. method simpler, less laborious and time consuming. It showed adequate linearity, sensitivity, repeatability and intermediate precision. A heat map displayed the quant. differences in the volatile profile of each stage of brewing. Mashing stood out in relation to the others steps by the highest levels of higher alcs. Boiling was characterized by the highest levels of Maillard reaction products, while fermentation, maturation and pasteurization were discriminated by a major presence of esters. Terpenes were incorporated to the wort during boiling or fermentation and the concentration of these compounds remained similar throughout the subsequent brewing steps.
Food Research International published new progress about Beer. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Application of Ethyl octanoate.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics