| Title: | "An innovative strategy to control Microcystis growth using tea polyphenols sustained-release particles: preparation, characterization, and inhibition mechanism" |
| Author(s): | Ni L; Wang J; Fang Y; Zhu C; Wizi J; Jiang Z; Du C; Li S; Chen X; Xu J; Su H; |
| Address: | "Key Laboratory of Integrated Regulation and Resource Development On Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China. College of Environment, Hohai University, Nanjing, 210098, China. College of Environment, Nanjing Normal University, Nanjing, 210097, China. lishiyin@njnu.edu.cn. River and Lake Governance and Water Resources Management Center, Wuxi, 214071, Jiangsu, China" |
| Journal Title: | Environ Sci Pollut Res Int |
| DOI: | 10.1007/s11356-023-25255-7 |
| ISSN/ISBN: | 1614-7499 (Electronic) 0944-1344 (Linking) |
| Abstract: | "Allelochemicals have been shown to inhibit cyanobacterial blooms for several years. In view of the disadvantages of 'direct-added' mode, natural and pollution-free tea polyphenolic allelochemicals with good inhibitory effect on cyanobacteria were selected to prepare sustained-release particles by microcapsule technology. Results showed that the encapsulation efficiency of tea polyphenols sustained-release particles (TPSPs) was 50.6% and the particle size ranged from 700 to 970 nm, which reached the nanoscale under optimum preparation condition. Physical and chemical properties of TPSPs were characterized to prove that tea polyphenols were well encapsulated and the particles had good thermal stability. The optimal dosage of TPSPs was determined to be 0.3 g/L, at which the inhibition rate on Microcystis aeruginosa in logarithmic growth period could be maintained above 95%. Simultaneous decrease in algal density and chlorophyll-a content indicated that the photosynthesis of algal cells was affected leading to cell death. Significant changes of antioxidant enzyme activities suggested that Microcystis aeruginosa's antioxidant systems had been disrupted. Furthermore, TPSPs increased the concentration of O(2-) which led to lipid peroxidation of cell membrane and a subsequent increase in malondialdehyde (MDA) content. Meanwhile, the protein content, nucleic acid content, and electrical conductivity in culture medium rose significantly indicating the cell membrane was irreversibly damaged. This work can provide a basis for the utilization of environmentally friendly algal suppressants" |
| Keywords: | *Microcystis Antioxidants/pharmacology Tea Polyphenols/pharmacology Delayed-Action Preparations *Cyanobacteria Pheromones/pharmacology Algal inhibition mechanism Harmful algal blooms Microcapsule technology Microcystis aeruginosa Optimal dosage Tea polyph; |
| Notes: | "MedlineNi, Lixiao Wang, Jiajia Fang, Yuanyi Zhu, Chengjie Wizi, Jakpa Jiang, Zhiyun Du, Cunhao Li, Shiyin Chen, Xuqing Xu, Jian Su, Hua eng Grant Nos. 51779079/National Natural Science Foundation of China/ 51979137/National Natural Science Foundation of China/ Grant No. BK20181313/Natural Science Foundation of Jiangsu Province/ Germany 2023/01/18 Environ Sci Pollut Res Int. 2023 Mar; 30(15):43113-43125. doi: 10.1007/s11356-023-25255-7. Epub 2023 Jan 17" |
