Analysis of anthocyanin pigments in Lonicera (Caerulea) extracts using chromatographic fractionation followed by microcolumn liquid chromatography-mass spectrometry |
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Authors: | Myjavcová Renáta Marhol Petr K?en Vladimír Simánek Vilím Ulrichová Jitka Palíková Irena Papou?ková Barbora Lemr Karel Bedná? Petr |
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Institution: | 1. Department of Analytical Chemistry, Faculty of Science, Palacký University, T?. 17. Listopadu 1192/12, CZ 771 46 Olomouc, Czech Republic;2. Institute of Microbiology, Center for Biocatalysis and Biotransformation, Academy of Sciences of the Czech Republic, Vídeňská 1083, CZ 142 20 Prague, Czech Republic;3. Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacký University, Hněvotínská 3, CZ 775 15 Olomouc, Czech Republic |
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Abstract: | Anthocyanins from the fruit Lonicera caerulea L. var. kamtschatica (blueberry honeysuckle, Caprifoliaceae) were studied via (semi)preparative chromatographic fractionation followed by MS and μLC/MS analysis. The extraction procedure was optimized with respect to analytical purposes as well as its potential use for the preparation of nutraceuticals. The highest yield of anthocyanins was obtained using acidified methanol as the extraction medium. A comparable total anthocyanin content was obtained using a mixture of methanol and acetone. However, when Lonicera anthocyanins were in contact with acetone, a condensation reaction occurred to a large extent and related 5-methylpyranoanthocyanins were found. The effect of other extraction media, including ethanol as a "green" solvent, is also discussed. The potential of two fractionation procedures for extract purification differing in their chromatographic selectivity and scale was studied (i.e. using a Sephadex LH-20 gel column and a reversed phase). Fractions obtained by both procedures were used for a detailed analysis. MS and μLC/MS(2) methods were used for monitoring anthocyanin and 5-methylpyranoderivatives content as well as identifying less common and more complex dyes (dimer of cyanidin-3-hexoside, cyanidin-ethyl-catechin-hexosides, etc.). These more complex dyes are most likely formed during fruit treatment. |
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Keywords: | Anthocyanin Blueberry honeysuckle Chromatography Dietary supplement Fractionation LC/MS Lonicera Mass spectrometry MS μLC Pyranoanthocyanin QqTOF |
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