应用化学 ›› 2025, Vol. 42 ›› Issue (2): 182-191.DOI: 10.19894/j.issn.1000-0518.240391

• 研究论文 • 上一篇    下一篇

金纳米棒自组装柔性膜的制备及比率型表面增强拉曼散射细菌传感器

田璐璐1, 胡松涛2, 屈栩州2, 王林1(), 董彪2()   

  1. 1.吉林大学白求恩口腔医学院,长春 130012
    2.吉林大学电子科学与工程学院,集成光电子学国家重点实验室,长春 130012
  • 收稿日期:2024-11-28 接受日期:2025-01-08 出版日期:2025-02-01 发布日期:2025-03-14
  • 通讯作者: 王林,董彪
  • 基金资助:
    国家自然科学基金面上项目(52272080);吉林省自然科学基金(20220402005GH)

Preparation of Gold Nanorod Self-Assembled Flexible Films and Ratiometric Surface-Enhanced Raman Scattering Detection of Bacteria

Lu-Lu TIAN1, Song-Tao HU2, Xu-Zhou QU2, Lin WANG1(), Biao DONG2()   

  1. 1.Department of Oral Implantology,School and Hospital of Stomatology,Jilin University,Changchun 130012,China
    2.State Key Laboratory on Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China
  • Received:2024-11-28 Accepted:2025-01-08 Published:2025-02-01 Online:2025-03-14
  • Contact: Lin WANG,Biao DONG
  • About author:dongb@jlu.edu.cn
    wanglin1982@jlu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China (No.?52272080) and the Natural Science Foundation of Jilin Province(20220402005GH)

摘要:

细菌是引发感染的关键因素,定量检测对临床监测和治疗指导至关重要。 通过二液相成膜法,将金纳米棒(Gold nanorods, Au NRs)自组装成致密的金属薄膜,并成功转移到超薄热塑性聚氨酯表面,形成了均匀且稳定的柔性表面增强拉曼散射(Surface-enhanced Raman scattering, SERS)活性基底。 该基底经过4-巯基苯硼酸(4-Mercaptophenylboric acid, MPBA)修饰,能够有效固定细菌并提供参比信号。 同时,该基底对修饰的MPBA分子的检测限能够达到1×10-9 mol/L。 制备了金银核壳结构的SERS标签,利用夹层中的5,5′-二硫代双(2-硝基苯甲酸)(5,5′-Dithiobis-(2-nitrobenzoic acid), DTNB)作为目标信号,制备的基底能够将SERS标签的信号增强约54倍。 将SERS标签与核酸适配体结合,实现了对大肠杆菌(Escherichia coliE.coli)的特异性识别。 通过分析目标信号与参比信号的拉曼特征峰强度比(I1337/I1078),在水和唾液样本中,细菌浓度在1×102~1×107 CFU/mL范围内与I1337/I1078呈现良好的线性关系,决定系数(R2 )为0.97126,优于仅分析目标信号的R2(0.87046),显示比率型分析拟合效果更佳。 这种策略在细菌检测方面具有潜在的应用价值。

关键词: 二液相成膜法, 金纳米棒, 表面增强拉曼散射, 4-巯基苯硼酸, 比率型分析

Abstract:

Bacteria are key factors in causing infections, and quantitative detection for bacteria is crucial for clinical monitoring and treatment guidance. Gold nanorods (Au NRs) were self-assembled into dense metallic films using a liquid-liquid interface method and successfully transferred onto an ultrathin thermoplastic polyurethane surface, forming a uniform and stable flexible surface-enhanced Raman scattering (SERS) active substrate. This substrate was modified with 4-mercaptophenylboronic acid (MPBA) to provide a reference signal for bacterial fixation. On this substrate, the detection limit for MPBA molecules can reach 1×10-9 mol/L. A gold-silver core-shell structured SERS tag was prepared, using 5,5'-dithiobis (2-nitrobenzoic acid) (DTNB) in the interlayer as the target signal. The signal of SERS tags can be enhanced by about 54 times by the prepared substrate. By combining SERS tags with nucleic acid aptamers, specific recognition of Escherichia coliE.coli) was achieved. By analyzing the ratio of Raman characteristic peak intensities between the target signal and the reference signal (I1337/I1078), a good linear relationship was observed between bacterial concentration in the range of 1×102 to 1×107 CFU/mL and I1337/I1078 in water and saliva samples, with a coefficient of determination (R2 =0.97126). It was superior to analyzing the target signal alone (R2 =0.87046), demonstrating that ratiometric analysis provided a better fit. This strategy shows potential application value in bacterial detection.

Key words: Liquid-liquid interface method, Gold nanorods, Surface-enhanced Raman scattering, 4-Mercaptophenylboronic acid, Ratiometric analysis

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