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首页> 外文期刊>Environmental Science & Technology >Role of Suberin, Suberan, and Hemicellulose in Phenanthrene Sorption by Root Tissue Fractions of Switchgrass (Panicum virgatum) Seedlings
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Role of Suberin, Suberan, and Hemicellulose in Phenanthrene Sorption by Root Tissue Fractions of Switchgrass (Panicum virgatum) Seedlings

机译：木er，苏木和半纤维素在柳枝Ro幼苗根部组织吸附​​菲中的作用

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摘要

Sorption of organic pollutants by root tissue fractions, and the role of root turnover in mobilizing organic pollutants in soils, may help elucidate mechanisms of pollutant uptake by plants. The sorption of phenanthrene by bulk root tissue of switchgrass (Panicum virgatum) seedlings exhibits uptake much higher than predicted based on the extractable lipids in root tissues and the octanol-water partition coefficient for phenanthrene. Surprisingly, the removal of waxes, extracted by organic solvents, results in only a slight reduction in sorption, however, the subsequent removal of suberin (polymeric lipids) by saponification greatly reduces the affinity of the residual materials (by 7-fold), suggesting that suberin serves as the major sorption medium for organic pollutants. The sorption capability of suberan (i.e., lignin and cellulose) components is completely masked by coexisting hemicellulose materials. The removal of the hemicellulose by acid hydrolysis markedly enhanced the affinity of plant root tissue fractions for phenanthrene (5-40 times), which was attributed to sorption by the aromatic condensed domains as derived from solid-state ~(13)C NMR data. Reversible sorption-desorption of bulk root tissue and the extractable lipids was observed, but the hydrolyzing fractions and the dewaxed-saponifiable residues demonstrated irreversible sorption.
机译：根组织部分对有机污染物的吸附以及根周转在动员土壤中有机污染物的作用，可能有助于阐明植物吸收污染物的机制。柳枝bulk（Panicum virgatum）幼苗的大块根组织对菲的吸收显示出比基于根组织中可提取脂质和菲的辛醇-水分配系数所预测的更高的吸收。出乎意料的是，除去由有机溶剂提取的蜡只会导致吸附量略有下降，但是随后通过皂化作用除去木脂蛋白（聚合脂质）会大大降低残留物质的亲和力（降低7倍），这表明sub木素是有机污染物的主要吸附介质。共存的半纤维素物质完全掩盖了木聚糖（即木质素和纤维素）组分的吸附能力。通过酸水解去除半纤维素显着增强了植物根组织级分对菲的亲和力（5-40倍），这归因于从固态〜（13）C NMR数据得出的芳族缩合结构域的吸附。观察到大块根组织和可提取脂质的可逆吸附-解吸，但水解级分和脱蜡的皂化残留物显示出不可逆的吸附。

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  • 来源
    《Environmental Science & Technology》 |2009年第11期|4130-4136|共7页
  • 作者

    BAOLIANG CHEN; JERALD L.SCHNOOR;

  • 作者单位

    Department of Civil and Environmental Engineering,University of Iowa, Iowa City, Iowa 52242 Department of Environmental Science, Zhejiang University, Hangzhou,Zhejiang 310028, China;

    Department of Civil and Environmental Engineering,University of Iowa, Iowa City, Iowa 52242;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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