A composite prepared from carboxymethyl chitosan and aptamer-modified gold nanoparticles for the colorimetric determination of Salmonella typhimurium

A composite prepared from carboxymethyl chitosan and aptamer-modified gold nanoparticles for the colorimetric determination of Salmonella typhimurium
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羧甲基壳聚糖和适配体修饰的金纳米颗粒制备的复合物用于比色测定鼠伤寒沙门氏菌

DOI:
10.1007/s00604-019-3827-5
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发表时间:
2019-10
期刊:
影响因子:
5.7
通讯作者:
Chen Cuimei
Chen Cuimei
中科院分区:
化学2区
文献类型:
--
作者:
Yi Jiecan;Wu Pian;Li Guiyin;Xiao Wen;Li Lei;He Yayuan;He Yafei;Ding Ping;Chen Cuimei

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描述了一种基于适体的测定鼠伤寒沙门氏菌(S。typh)。羧甲基壳聚糖负载氨基修饰的抗沙门氏菌适体。typh,然后通过静电相互作用吸附在金纳米颗粒上,形成复合物,作为分子识别元件。在S. typh,它将被适体结合,这改变了识别元件的结构。在添加盐溶液时,金纳米颗粒聚集,使得溶液的颜色从红色变为蓝色。S. TYPH可以通过测量550 nm处的吸光度来检测。吸光度随S的对数线性增加。浓度范围为100 ~ 109 cfu·mL-1。检测限为16 cfu·mL−1。对该方法的特异性和实用性进行了评价。S.加标牛奶样品的伤寒沙门氏菌检出率在92.4%和97.2%之间。分析结果与平板计数法基本一致。伤寒沙门氏菌(S. typh)使用羧甲基壳聚糖(CMCS)-适体(Apt)-金纳米颗粒(AuNPs)复合物。伤寒沙门氏菌(S. typh)使用羧甲基壳聚糖(CMCS)-适体(Apt)-金纳米颗粒(AuNPs)复合物。
An aptamer-based assay is described for the determination of Salmonella typhimurium (S. typh). Carboxymethyl chitosan was loaded with amino-modified aptamer against S. typh, and then adsorbed on gold nanoparticles by electrostatic interaction to form a composite that acts as the molecular recognition element. In the presence of S. typh, it will be bound by the aptamer, and this changes the structure of the recognition element. On addition of salt solution, the gold nanoparticles agglomerate so that the color of the solution changes from red to blue. S. typh can be detected via measurement of the absorbance at 550 nm. Absorbance increases linearly with the logarithm of the S. typh concentration in the range from 100 to 109 cfu·mL−1. The limit of detection is 16 cfu·mL−1. The specificity and practicability of the assay were evaluated. The recoveries of S. typh from spiked milk samples are between 92.4 and 97.2%. The analytical results are basically consistent with those of a plate counting method. Graphical abstract Schematic representation of the colorimetric assay for Salmonella typhimuium (S. typh) using carboxymethyl chitosan (CMCS)-aptamer (Apt)-gold nanoparticles (AuNPs) composites. Schematic representation of the colorimetric assay for Salmonella typhimuium (S. typh) using carboxymethyl chitosan (CMCS)-aptamer (Apt)-gold nanoparticles (AuNPs) composites.
使用适体修饰的 NaYF4:Ce/Tb 纳米颗粒和荧光 DNA 标记进行均相时间分辨 FRET 测定,用于检测鼠伤寒沙门氏菌
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期刊: MICROCHIMICA ACTA
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