College of Pharmacy, Guangxi University of Chinese Medicine, Nanning 530001, China.
Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology, Guangxi Colleges and Universities Key Laboratory for Efficient Use of Featured Resources in the Southeast of Guangxi, College of Chemistry and Food Science, Yulin Normal University, Yulin 537000, China.
Molecules. 2023 Aug 23;28(17):6194. doi: 10.3390/molecules28176194.
In this study, Ag-CaCO nanocomposites were synthesized using silver nitrate as the precursor solution based on calcium carbonate nanoparticles (CaCO NPs). The synthesis involved the reaction of calcium lignosulphonate and sodium bicarbonate. The properties of Ag-CaCO nanocomposites were studied by various technologies, including an ultraviolet-visible spectrophotometer, a transmission electron microscope, and a Raman spectrometer. The results showed that Ag-CaCO nanocomposites exhibited a maximum UV absorption peak at 430 nm, the surface-enhanced Raman spectroscopy (SERS) activity of Ag-CaCO nanocomposites was evaluated using mercaptobenzoic acid (MBA) as the marker molecule, resulting in an enhancement factor of 6.5 × 10. Additionally, Ag-CaCO nanocomposites were utilized for the detection of forchlorfenuron. The results demonstrated a linear relationship in the concentration range of 0.01 mg/mL to 2 mg/mL, described by the equation y = 290.02x + 1598.8. The correlation coefficient was calculated to be 0.9772, and the limit of detection (LOD) was determined to be 0.001 mg/mL. These findings highlight the relatively high SERS activity of Ag-CaCO nanocomposites, making them suitable for analyzing pesticide residues and detecting toxic and harmful molecules, thereby contributing to environmental protection.
在这项研究中，使用硝酸银作为前驱体溶液，基于碳酸钙纳米粒子 (CaCO NPs) 合成了 Ag-CaCO 纳米复合材料。该合成涉及木质素磺酸钠和碳酸氢钠的反应。通过各种技术研究了 Ag-CaCO 纳米复合材料的性质，包括紫外可见分光光度计、透射电子显微镜和拉曼光谱仪。结果表明，Ag-CaCO 纳米复合材料在 430nm 处表现出最大的紫外吸收峰，Ag-CaCO 纳米复合材料的表面增强拉曼光谱 (SERS) 活性通过巯基苯甲酸 (MBA) 作为标记分子进行评估，得到的增强因子为 6.5×10。此外，Ag-CaCO 纳米复合材料还用于检测氯吡脲。结果表明，在 0.01mg/mL 至 2mg/mL 的浓度范围内存在线性关系，其方程为 y = 290.02x + 1598.8。计算得到的相关系数为 0.9772，检测限 (LOD) 确定为 0.001mg/mL。这些发现突出了 Ag-CaCO 纳米复合材料相对较高的 SERS 活性，使其适合分析农药残留和检测有毒有害物质，从而有助于环境保护。
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