Liquid Chromatographic Simultaneous Determination of Peroxycarboxylic Acids Using Postcolumn Derivatization
作者:S. Effkemann、U. Pinkernell、R. Neumüller、F. Schwan、H. Engelhardt、U. Karst
DOI:10.1021/ac980256b
日期:1998.9.1
The first liquid chromatographic method with postcolumn derivatization for the simultaneous determination of peroxycarboxylic acids is described. Aliphatic peracids with chain lengths from C2 to C12 are separated by HPLC on a reversed-phase C18 column with acetonitrile/water gradient elution. For improved peak shape, tetrahydrofuran and acetic acid are added to the aqueous eluent. After chromatographic separation, the peroxycarboxylic acids react with 2,2‘-azino-bis(3-ethylbenzothiazoline)-6-sulfonate, a popular substrate for the enzyme peroxidase. Iodide traces are added as catalyst. The oxidation product, a green radical cation, is determined using a UV/visible detector in four characteristic regions of the visible and near-infrared spectrum in the range 405−815 nm. The advantages of the new method are detection limits in the low micromolar range, negligible matrix interferences, high reproducibility, and the possibility for simultaneous determination of several peroxycarboxylic acids.
本文介绍了一种具有柱后衍生化的液相色谱分析方法,用于同时测定过氧羧酸。通过高效液相色谱法在反相C18柱上利用乙腈/水梯度洗脱分离C2至C12链长的脂肪族过氧酸。为了改善峰形,在水中加入四氢呋喃和乙酸。色谱分离后,过氧羧酸与2,2'-偶氮双(3-乙基苯并噻唑啉)-6-磺酸盐反应,这是一种常用的过氧化酶底物。添加微量的碘化物作为催化剂。氧化产物绿色自由基阳离子通过紫外/可见光检测器在可见光和近红外光谱的四个特征区域(405-815 nm)内测定。新方法的优势在于检测限低至微摩尔范围,基质干扰可忽略不计,重现性高,并且能够同时测定多种过氧羧酸。