首页> 外文期刊>Journal of the Institute of Brewing >Liquid Chromatography-Diode Array and Electrospray High-Accuracy Mass Spectrometry of Iso-α-Acids in DCHA-lso Standard and Beer
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Liquid Chromatography-Diode Array and Electrospray High-Accuracy Mass Spectrometry of Iso-α-Acids in DCHA-lso Standard and Beer

机译:DCHA-lso标准品和啤酒中的异α-酸的液相色谱-二极管阵列和电喷雾高精度质谱

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摘要

Excellent liquid chromatographic (LC) separation of cis/trans stereoisomers of iso-α-acids has been achieved with reversed-phase sorbent XTerra MS C18. An isocratic alkaline mobile phase, consisting of a mixture of 5 mmol l~(-1) ammonium acetate (pH 8)-acetonitrile-methanol, 62:21:17 (v/v/v), was used. In the DCHA-Iso international calibration standard trans-isoposthumulone was identified combining photo diode array (PDA) spectra and electrospray high-accuracy mass spectrometric (MS) data. Moreover, the molecular mass of two degradation products resulting from the in-solution storage of the DCHA-Iso standard was determined. The presence of trans and cis isomers of iso-posthumulone, isocohumulone, isoadhumulone and iso-n-humulone in beer samples was confirmed. The trans isomers of iso-α-acids showed characteristic and reproducibly slightly different ultraviolet absorbance spectra with respect to cis isomers.
机译:使用反相吸附剂XTerra MS C18,可以实现出色的液相色谱(LC)分离异α-酸的顺式/反式立体异构体。使用等度碱性流动相,该流动相由5 mmol l〜(-1)乙酸铵(pH 8)-乙腈-甲醇的混合物62:21:17(v / v / v)组成。在DCHA-Iso国际校准标准中,结合了光电二极管阵列(PDA)光谱和电喷雾高精度质谱(MS)数据,确定了反异胡草酮。此外,测定了由DCHA-Iso标准品在溶液中储存导致的两种降解产物的分子量。证实了啤酒样品中异hu草酮,异co草酮,异ad草酮和异正hu草酮的反式和顺式异构体的存在。异α-酸的反式异构体相对于顺式异构体表现出特征性且可再现地略有不同的紫外线吸收光谱。

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