Ghabbour Elham A, Davies Geoffrey, Lam Yam-Yuen, Vozzella Marcy E
Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115-5000, USA.
Environ Pollut. 2004 Oct;131(3):445-51. doi: 10.1016/j.envpol.2004.02.013.
Humic acids (HAs) are animal and plant decay products that confer water retention, metal and organic solute binding functions and texture/workability in soils. HAs assist plant nutrition with minimal run-off pollution. Recent isolation of HAs from several live plants prompted us to investigate the HA content of the water hyacinth (Eichhornia crassipes [Mart.] Solm-Laubach: Pontedericeae), a delicately flowered plant from Amazonian South America that has invaded temperate lakes, rivers and waterways with devastating economic effects. Hyacinth thrives in nutrient-rich and polluted waters. It has a high affinity for metals and is used for phytoremediation. In this work, HAs isolated from the leaves, stems and roots of live water hyacinth plants from the Nile Delta, Egypt were identified by chemical and spectral analysis and by comparison with authentic soil and plant derived HAs. Similar carbohydrate and amino acid distributions and tight metal binding capacities of the HAs and their respective plant components suggest that the presence of HAs in plants is related to their metal binding properties.
腐殖酸（HAs）是动植物的腐烂产物，具有保水、结合金属和有机溶质的功能，还能改善土壤质地和可加工性。腐殖酸有助于植物营养吸收，且径流污染极小。近期从几种活体植物中分离出腐殖酸，促使我们研究凤眼莲（Eichhornia crassipes [Mart.] Solm-Laubach: 雨久花科）中的腐殖酸含量。凤眼莲是一种原产于南美洲亚马逊地区、花朵精致的植物，现已入侵温带湖泊、河流和水道，造成了毁灭性的经济影响。凤眼莲在营养丰富和污染的水域中生长旺盛。它对金属有很高的亲和力，可用于植物修复。在这项研究中，通过化学和光谱分析，并与正宗的土壤和植物来源的腐殖酸进行比较，鉴定了从埃及尼罗河三角洲的活体凤眼莲植物的叶、茎和根中分离出的腐殖酸。腐殖酸及其各自植物成分相似的碳水化合物和氨基酸分布以及紧密的金属结合能力表明，植物中腐殖酸的存在与其金属结合特性有关。
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