Multifunctional AuAg-doping Prussian Blue-based MOF: Enhanced colorimetric catalytic activities and amplified SERS signals for bacteria discrimination and detection

被引:34
作者
Cai, Jianhong [1 ,2 ,3 ]
Lin, Yongjian [1 ,2 ,3 ]
Yu, Xiuwen [4 ]
Yang, Yingqi [2 ,4 ]
Hu, Yuqing [1 ,2 ,3 ]
Gao, Lele [1 ]
Xiao, Haichuan [4 ]
Du, Jiarui [4 ]
Wang, Haonan [4 ]
Zhong, Xing [5 ]
Sun, Pinghua [5 ]
Liang, Xujing [5 ]
Zhou, Haibo [1 ,2 ,3 ,4 ]
Cai, Huaihong [1 ,2 ,3 ]
机构
[1] Jinan Univ, Coll Chem & Mat Sci, Guangzhou 510632, Peoples R China
[2] Jinan Univ, Shenzhen Peoples Hosp, Clin Med Coll 2, Shenzhen 518020, Peoples R China
[3] Jinan Univ, Affiliated Hosp 5, Heyuan 517000, Peoples R China
[4] Jinan Univ, Coll Pharm, Guangzhou 510632, Peoples R China
[5] Jinan Univ, Dept Ultrasonog, Affiliated Hosp 1, Guangzhou 510632, Peoples R China
基金
中国国家自然科学基金;
关键词
Multifunctional nanozyme; Prussian Blue-analogic MOF; Colorimetric; SERS sensing; Nanozyme amplification; Bacteria detection; GOLD; NANOPARTICLES; SILVER;
D O I
10.1016/j.snb.2023.134279
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
New strategy of a rapid, sensitive bacteria detection is highly desirable. Constructing a dual-mode colorimetric/ surface-enhanced Raman scattering (SERS) biosensor is key to obtain highly sensitive discriminating and detecting of different pathogen bacteria with high accuracy. Herein, we developed a multifunctional colorimetric catalytic nanozyme (AuAg@PB MOF) composed of AuAg-doping Prussian Blue analogue-based metal-organic framework (MOF) that fabricated by self-assembled sheet growth of Ag-etched silver-coated gold nanoparticles (Au@Ag NPs) mediated by addition of ferricyanide (K3[Fe(CN)6]). AuAg@PB MOF displays ultrahigh peroxidase-mimicking activity, enhanced colorimetric signal brightness, and notably SERS enhancement. Through optimizing its Fe-doping level, peroxidase-like activity of AuAg@PB MOF is approximately 1900-fold higher than that of horseradish peroxidase (HRP), while its 3-fold enhancement in SERS signal compared with that of gold nanoparticles (Au NPs). Integrated with nanozyme-based sandwich system that made of bacteria/4MPBA (4-mercaptophenylboronic acid)/AuAg@PB MOF, this dual-modal biosensor achieves a highly sensitive colorimetric assay of bacteria with a lower limit of detection (6 CFU/mL), and simultaneously discriminate E. coli and S. aureus by bacterial "fingerprints" spectra. Furthermore, this proposed colorimetric assay was combined with a smartphone readout-sensing platform for determining bacteria with ultra-sensitivity (2 CFU/mL). This work exhibits a novel colorimetric nanozyme used in dual-mode colorimetric/SERS sensing of bacteria.
引用
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页数:11
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