生物传感器
催化作用
格式化
表面等离子共振
检出限
共价键
吸收(声学)
拉曼散射
甲酸钠
纳米颗粒
材料科学
化学
拉曼光谱
无机化学
核化学
纳米技术
色谱法
有机化学
复合材料
物理
光学
作者
Jingjing Li,Yiyi Shu,Chongning Li,Zhiliang Jiang
标识
DOI:10.3389/fnut.2022.1075296
摘要
High affinity peptides (PTs) have been used in nanoanalysis, but there are no reports which combine PTs with a liquid crystal (LC) covalent organic framework (COF) supported soluble starch (SS) catalytic amplification system as a biosensor recognition element. In this study, a new, highly sensitive and selective bi-mode molecular biosensor has been developed for the determination of cadmium ion (Cd 2+ ). Specifically, a highly catalytic and stable COF supported SS nanosol catalyst was fabricated such that a nanocatalytic indicator reaction system for HAuCl 4 -sodium formate was established based on surface-enhanced Raman scattering (SERS). The Au nanoparticles produced exhibited a surface plasmon resonance (SPR) absorption peak at 535 nm and a SERS peak at 1,615 cm –1 . Combining the nanocatalytic amplification indicator system with the specific PTs reaction permitted a sensitive and selective SERS/absorption bi-mode platform to be developed for the determination of cadmium in rice. The linear range for SERS determination was 0.025–0.95 nmol/L and the detection limit (DL) was 0.012 nmol/L.
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