Aggregation, Sedimentation, and Dissolution of Copper Oxide Nanoparticles: Influence of Low-Molecular-Weight Organic Acids from Root Exudates
Aggregation, Sedimentation, and Dissolution of Copper Oxide Nanoparticles: Influence of Low-Molecular-Weight Organic Acids from Root Exudates
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氧化铜纳米粒子的聚集、沉降和溶解：根系分泌物中低分子量有机酸的影响
DOI：
10.3390/nano9060841
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发表时间：
2019-06
期刊：
影响因子：
5.3
通讯作者：
Shi Jiyan
中科院分区：
文献类型：
--
作者：
Peng Cheng;Tong Hong;Yuan Peng;Sun Lijuan;Jiang Lei;Shi Jiyan
根际是植物根吸收金属纳米颗粒（MNP）的重要途径。然而，根系分泌物与 MNP 之间的相互作用仍不清楚。在这项研究中，我们最初使用水培法鉴定了水稻根部分泌物中的主要低分子量有机酸（LMWOA）。然后，将单独的 LMWOAs 添加到 CuO 纳米颗粒悬浮液中，以研究它们对 MNP 环境行为的影响。结果表明，LMWOAs 的种类和浓度都会影响 CuO 纳米颗粒 (NPs) 的聚集、沉降和溶解。除琥珀酸外，几乎所有LMWOAs都通过增强NPs之间的静电排斥力来抑制CuO NPs的聚集。柠檬酸和草酸的存在（而不是乳酸）极大地提高了 CuO NP 悬浮液的稳定性，但其他酸对 NP 沉降表现出较低的促进作用和较高的抑制作用。此外，所有来自根分泌物的LMWOAs都促进了CuO NPs的溶解，并呈正剂量依赖性相关，尤其是甲酸。值得注意的是，柠檬酸作为水稻根系分泌物中最丰富的LMWOA，在很大程度上决定了CuO NPs的聚集、沉降和溶解。这项研究提供了对根际纳米颗粒与植物相互作用的更好理解。
The rhizosphere is an essential pathway for the uptake of metal-based nanoparticles (MNPs) by plant roots. However, the interaction between root exudates and MNPs is still unclear. In this study, we initially identified the major low-molecular-weight organic acids (LMWOAs) in the rice root exudates using hydroponics. Then, the individual LMWOAs were added to CuO nanoparticle suspensions to investigate their effects on the environmental behavior of the MNPs. The results showed that both the variety and the concentration of LMWOAs impacted the aggregation, sedimentation, and dissolution of CuO nanoparticles (NPs). Almost all LMWOAs except succinic acid inhibited the aggregation of CuO NPs by enhancing the electrostatic repulsive force between NPs. The presence of citric and oxalic acids rather than lactic acid greatly improved the stability of CuO NP suspensions, but other acids showed a low promoting and high inhibiting effect on NP sedimentation. Moreover, all the LMWOAs from root exudates facilitated the dissolution of CuO NPs with a positive dose-dependent correlation, especially formic acid. Notably, citric acid, as the most abundant LMWOAs in rice root exudates, largely determined the aggregation, sedimentation, and dissolution of CuO NPs. This study provides a better understanding on NP–plant interactions in the rhizosphere.
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影响因子：
7.7
作者：
Weilan Zhang;Yongbo Dan;Honglan Shi;Xingmao Ma
通讯作者：
Weilan Zhang;Yongbo Dan;Honglan Shi;Xingmao Ma
影响因子：
5.7
作者：
Lin Guo;D. Ott;T. Cutright
通讯作者：
Lin Guo;D. Ott;T. Cutright
影响因子：
4.1
作者：
Cheng Peng;H. Zhang;Huaxiang Fang;Chen Xu;Haomin Huang;Yi Wang;Lijuan Sun;Xiaofeng Yuan
通讯作者：
Cheng Peng;H. Zhang;Huaxiang Fang;Chen Xu;Haomin Huang;Yi Wang;Lijuan Sun;Xiaofeng Yuan
DOI：
--
发表时间：
1971
期刊：
--
影响因子：
--
作者：
S. Yoshida;D. Forno;J. Cock
通讯作者：
S. Yoshida;D. Forno;J. Cock
影响因子：
6.8
作者：
Fu, Huijie;Yu, Haiying;Zhang, Xizhou
通讯作者：
Zhang, Xizhou