Hatano Ken-Ichi, Teraki Minori, Nakajima Daiki, Yamatsu Takeshi
Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma, 376-8515, Japan.
Environ Sci Pollut Res Int. 2021 Jul;28(28):37562-37569. doi: 10.1007/s11356-021-13363-1. Epub 2021 Mar 14.
In this study, we investigate the release of melanoidin-like product (MLP) from hybrid silica xerogels to control the quantity of MLP in the medium for lead phytoextraction. In the preparation of the hybrid organic-inorganic xerogels with MLP, tetraethoxysilane (TEOS), methyltriethoxysilane (MTES), propyltriethoxysilane (PTES), and 3-aminopropyltriethoxysilane (APTES) were used as precursors. The experimental results suggest that the release of MLP can be easily controlled by partially substituting TEOS with the organosilanes. The addition of the organosilanes lowered the release rate of MLP in the following order of xerogels: TEOS, MTES/TEOS, PTES/TEOS, and APTES/TEOS. Furthermore, a novel phytoextraction of lead through the Indian mustard was conducted using the MLP-doped TEOS xerogel. Results show that the addition of TEOS xerogel did not have any influence on the growth of the mustard, whereas the lead uptake significantly increased in a nutrition medium with 1-mM Pb(NO). In conclusion, the beneficial effect of the MLP-doped TEOS xerogel on lead phytoextraction was confirmed.
在本研究中，我们研究了杂化二氧化硅干凝胶中类黑素样产物（MLP）的释放情况，以控制用于铅植物提取的培养基中MLP的量。在用MLP制备有机-无机杂化干凝胶时，使用四乙氧基硅烷（TEOS）、甲基三乙氧基硅烷（MTES）、丙基三乙氧基硅烷（PTES）和3-氨丙基三乙氧基硅烷（APTES）作为前驱体。实验结果表明，通过用有机硅烷部分替代TEOS，可以轻松控制MLP的释放。有机硅烷的添加降低了MLP在以下干凝胶中的释放速率：TEOS、MTES/TEOS、PTES/TEOS和APTES/TEOS。此外，使用掺杂MLP的TEOS干凝胶对印度芥菜进行了一种新型的铅植物提取。结果表明，添加TEOS干凝胶对芥菜的生长没有任何影响，而在含有1 mM Pb(NO)的营养培养基中，铅的吸收显著增加。总之，证实了掺杂MLP的TEOS干凝胶对铅植物提取具有有益作用。
