Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1339, Issue -, Pages 103-109Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2014.02.084
Keywords
Acidic pH; Boronate affinity; Cis-diol; Monolithic column; Secondary separation; Pyridinylboronic acid
Funding
- National Natural Science Foundation of China [21075063, 21275073, 21121091]
- Natural Science Foundation of Jiangsu Province [KB2011054]
- Ministry of Science and Technology of China [35-15]
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Boronate affinity chromatography (BAC) is a unique means for the selective separation and enrichment of 1,2 and 1,3 cis-diol-containing compounds. However, conventional boronate affinity materials require a basic binding pH (usually >= 8.5), which gives rise to not only inconvenience in operation but also the risk of degradation of labile compounds. Although the applicable pH has been expanded to 5.0 in recent years, the current boronate affinity materials still fail to meet the acidic pH end of frequently used biosamples, particularly urine (pH 4.5). In this study, we report a 3-pyridylboronic acid-functionalized organic-silica hybrid monolithic capillary that exhibited a binding pH of 4.5, the lowest so far in BAC. Such a binding pH enabled direct extraction of cis-diol-containing biomolecules such as nucleosides from urine samples without pH adjustment. The boronate affinity monolithic capillary showed enhanced affinity toward negatively charged cis-diol-containing analytes such as ribonucleotides. Moreover, it could function as an anion exchanger at acidic pH (similar to 2). The column was found to retain multiple compounds from urine, which can be assumed to be at least mostly if not entirely cis-diol-containing compounds. (C) 2014 Elsevier B.V. All rights reserved.
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