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南昌大学熊勇华&黄小林‖【Anal. Chem. 】磁性-金等离激元黑体:实现伤寒沙门氏菌光热检测与灭活的双功能平台

  • 2026-04-14 20:15:44
南昌大学熊勇华&黄小林‖【Anal. Chem. 】磁性-金等离激元黑体:实现伤寒沙门氏菌光热检测与灭活的双功能平台

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介绍 /Introduction

食源性病原体对公众健康构成重大风险,亟需开发高灵敏的现场检测技术与高效抗菌策略。为此,南昌大学熊勇华&黄小林通过原位氧化还原聚合法在金磁纳米颗粒表面包覆金/聚多巴胺杂化层,成功合成了磁性-金等离激元黑体纳米复合材料。所制备的MNP@GPB纳米复合材料具有优异的胶体稳定性、宽谱光吸收特性、快速磁响应性能及高效光热转换效率。基于上述特性,我们构建了多功能探针,其在免疫层析检测中兼具磁富集能力、比色/光热双模信号输出功能及抗菌活性,实现了对伤寒沙门氏菌的高灵敏检测与同步灭活。在比色模式下,MNP@GPB-ICA的检测限为1.4×10³ CFU/mL,光热模式下检测限达3.4×10² CFU/mL,灵敏度较传统金纳米颗粒ICA分别提升约8倍和32倍。值得注意的是,经近红外光照射后,检测线上残留的伤寒沙门氏菌可实现近乎完全灭活,显著降低了废弃试纸条造成的二次污染风险。MNP@GPB材料系统构建了诊断信号输出与抗菌功能一体化的革新平台,为食品安全监测提供了创新解决方案。
相关成果以 “ Magnetic-Gold Plasmonic Blackbodies for PhotothermalImmunochromatographic Detection and Inactivation of Salmonella typhimurium” 为题发表在《Anal. Chem. 
全文速递南昌大学熊勇华&黄小林‖Anal.Chem.磁性-金等离激元黑体实现伤寒沙门氏菌光热检测与灭活的双功能平台.pdf

研究图/Introduction

Scheme 1. Schematic Overview of the MNP@GPB-ICA Platform for the Sensitive Detection and Simultaneous Photothermal Inactivation of S. typhimurium

Figure 1. Characterization of MNP@GPBs. (a) Schematic illustration of the synthetic route for MNP@GPBs. Representative SEM (b) and TEM (c) images of the MNP core. SEM (d) and (e) TEM images of the synthesized MNP@GPBs. (f) High-resolution TEM (HRTEM) image of MNP@GPBs. (g) EDS elemental mapping of MNP@GPBs. (h) Hydrodynamic diameter distribution of MNPs and MNP@GPBs. (i) XPS spectrum of MNPs and MNP@GPBs. (j) Magnetization hysteresis loops of MNPs and MNP@GPBs.

Figure 2. Colorimetric and photothermal performance of MNP@GPBs. 

Figure 3. Analytical performance of the MNP@GPB-ICA for the detection of S. typhimurium. 
Figure 4. Evaluation of the antibacterial efficacy of MNP@GPB nanocomposites. 

结论 /Conclusion

总之,我们通过在磁性纳米颗粒(MNPs)表面沉积一层独特的金/聚多巴胺杂化层,合成了 MNP@GPB 纳米复合材料。这有效地解决了磁性光热纳米材料常见的挑战,如光逃逸和磁屏蔽。所得的 MNP@GPB 表现出卓越的胶体稳定性、宽带吸收、高效的光热转换(η = 56.13%)以及快速的磁响应(饱和磁化强度为 47.5 emu/g)。随后,我们将这些纳米复合材料应用于开发一种光热免疫层析平台,用于高灵敏度检测和同时灭活鼠伤寒沙门氏菌。定量分析表明,在 CM-ICA 中的检测限为 1.4×10³ CFU/mL,在 PT-ICA 中为 3.4×10² CFU/mL,分别比传统的 AuNPs-ICA 提高了 8 倍和 32 倍的灵敏度。集成的磁分离和双信号读出确保了在复杂食品基质中的可靠性能。最重要的是,MNP@GPB 不仅提高了检测灵敏度,还能在测试线上光热灭活残留的鼠伤寒沙门氏菌,降低了二次细菌污染的风险。综合来看,MNP@GPBs 为设计高性能磁性光热纳米复合材料提供了一种有前景的策略,而 MNP@GPB-ICA 则为开发灵敏且安全的细菌检测平台提供了一种通用且有效的方法。

文献直通车 /Literature information

Magnetic-Gold Plasmonic Blackbodies for Photothermal Immunochromatographic Detection and Inactivation of Salmonella typhimuriumYuhao Wu, Qianying Li, Qing Liu, Jiayi Sun, Liu Jiang, Weitao He, Xiaolong Wang, Yuankui Leng, Yonghua Xiong,and Xiaolin Huang*原文链接:https://doi.org/10.1021/acs.analchem.5c07116

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  1. CONNECT:[ UseTime:0.000585s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000868s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000365s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000337s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000561s ]
  6. SELECT * FROM `set` [ RunTime:0.000274s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000573s ]
  8. SELECT * FROM `article` WHERE `id` = 477100 LIMIT 1 [ RunTime:0.000478s ]
  9. UPDATE `article` SET `lasttime` = 1776855255 WHERE `id` = 477100 [ RunTime:0.000944s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000275s ]
  11. SELECT * FROM `article` WHERE `id` < 477100 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000522s ]
  12. SELECT * FROM `article` WHERE `id` > 477100 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000489s ]
  13. SELECT * FROM `article` WHERE `id` < 477100 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001091s ]
  14. SELECT * FROM `article` WHERE `id` < 477100 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001529s ]
  15. SELECT * FROM `article` WHERE `id` < 477100 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001266s ]
0.078290s