41 research outputs found

    Efficient quantification of the phenolic profiles of <i>Zanthoxylum bungeanum</i> leaves and correlation between chromatographic fingerprint and antioxidant activity

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    <p>Sixteen subsequent fractions were prepared from the ethyl acetate fraction of <i>Zanthoxylum bungeanum</i> leaves after bio-guided chromatographic separation. The HPLC profiles and antioxidant activity of the various fractions indicated that the content of eight phenolic compounds (chlorogenic acid, epicatechin, rutin, hyperoside, trifolin, quercitrin, afzelin and quercetin) and antioxidant activity vary significantly, and high concentrations of a combination of eight phenolic compounds would result in an increase of the antioxidant activity. These results suggested that the eight compounds could be used as chemical markers for quality assessment of <i>Z. bungeanum</i> leaves. Correlation between chromatographic fingerprint and antioxidant activity of the fractions showed that quercitrin and hyperoside play crucial roles in the antioxidant activity, and they can be seen as the milestone for quality control. The findings also suggested that five obtained fractions (E-3-3, E-2-4, E-7, E-5 and E-4) could become useful supplements for functional food ingredients and health-related products.</p

    <sup>1</sup>H, <sup>13</sup>C, HMBC and COSY NMR spectroscopic data (500 MHz, DMSO-d<sub>6</sub>) of compounds 1, 3, 5, 7 and 9.

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    <p>Assignments were done by 1D (<sup>1</sup>H, <sup>13</sup>C, DEPT) and 2D (COSY, HSQC, HMBC) NMR experiments.</p><p><sup>1</sup>H, <sup>13</sup>C, HMBC and COSY NMR spectroscopic data (500 MHz, DMSO-d<sub>6</sub>) of compounds 1, 3, 5, 7 and 9.</p

    Antioxidant activities of the extracts and different fractions from <i>Z. bungeanum</i> leaves.

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    <p>ECE: ethanol crude extracts; PEF: petroleum ether fraction; CF: chloroform fraction; EAF: ethyl acetate fraction; AF: acetone fraction; MF: methanol fraction.</p><p>Each values represented in tables are means ± SD (N = 3).</p><p>Values with different letters (a, b, c, d, e) within same column were significantly different (P<0.05).</p><p>Antioxidant activities of the extracts and different fractions from <i>Z. bungeanum</i> leaves.</p

    <sup>1</sup>H, <sup>13</sup>C, HMBC and COSY NMR spectroscopic data (500 MHz, DMSO-d<sub>6</sub>) of compounds 2, 4, 6 and 8.

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    <p>Assignments were done by 1D (<sup>1</sup>H, <sup>13</sup>C, DEPT) and 2D (COSY, HSQC, HMBC) NMR experiments.</p><p><sup>1</sup>H, <sup>13</sup>C, HMBC and COSY NMR spectroscopic data (500 MHz, DMSO-d<sub>6</sub>) of compounds 2, 4, 6 and 8.</p
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