Marsili, Ray Thomas published the artcileEvaluation of Sequential-SBSE and TF-SPME Extraction Techniques Prior to GC-TOFMS for the Analysis of Flavor Volatiles in Beer, Application of Ethyl octanoate, the main research area is beer flavor volatile SBSE thin film SPME GC TOFMS.
Sequential-Stir Bar Sorptive Extraction (Seq-SBSE) was investigated as a technique for the extraction and concentration of volatiles in beer prior to gas chromatog.-time-of-flight mass spectrometry (GC-TOFMS) anal. for standard solutions prepared in an imitation beer solvent. Twenty-seven beer analytes across a range of polarities (Ko/w’s) were investigated. The technique provided acceptable quantitation for most of the 27 analytes investigated, but calibration curves for five of the most polar analytes were nonlinear. Thin Film SPME (TF-SPME) sample preparation, which has recently been shown to provide quant. extraction of polar analytes, was compared to Seq-SBSE results for the standard solutions TF-SPME provided linear calibration curves for all 27 analytes. To compare test precision, a com. sample of beer was analyzed in triplicate by both techniques. Eighty-five analytes were detected by Seq-SBSE with an average percentage of relative standard deviation (%RSD) of 9.7% and 95 analytes were detected by TF-SPME with an average %RSD of 8.9%. Triplicate samples from three brands of com. beers at the end of shelf life were analyzed. Ten potential off-flavor chems. analyzed by TF-SPME were subjected to principal component anal. Examination of principal component anal. (PCA) loadings results showed the most significant concentration differences in off-flavor chems. in the different brands occurred with E-2-nonenal, 3-methyl-2-butene-1-thiol, and vinyl guaiacol. Studies showed that some analytes showed better detection sensitivity by Seq-SBSE, while other analytes were detected with higher sensitivity by TF-SPME. Linear least squares correlation coefficients for calibration curves were higher for Seq-SBSE except for highly polar volatiles, while TF-SPME was able to quant. detect more chems. including highly polar ones. TF-SPME appears to be an excellent supplemental technique for the anal. of beer volatiles.
Journal of the American Society of Brewing Chemists 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