检出限
石墨烯
量子点
纳米复合材料
材料科学
胶体金
循环伏安法
傅里叶变换红外光谱
电化学气体传感器
核化学
分析化学(期刊)
电极
纳米技术
化学
纳米颗粒
电化学
化学工程
色谱法
物理化学
工程类
作者
Deepak Kala,Tarun Kumar Sharma,Shagun Gupta,Reena V. Saini,Adesh K. Saini,Walaa F. Alsanie,Vijay Kumar Thakur,Ankur Kaushal
出处
期刊:Chemosphere
[Elsevier]
日期:2022-08-01
卷期号:300: 134428-134428
被引量:5
标识
DOI:10.1016/j.chemosphere.2022.134428
摘要
The graphene quantum dots (GQDs) was synthesized using potato starch and water by hydrothermal method and further used for reduction of tetracholoroauric acid to form graphene quantum dots-gold (GQDs@AuNPs) nanocomposite. The GQDs/GQDs@AuNPs were analyzed using FTIR, UV-Vis, Flourometry and HR-TEM. The synthesized GQDs@AuNPs were further used for fabrication of cost-effective screen-printed paper electrode (SPPE) based DNA sensor for the detection of O. tsutsugamushi using htrA gene specific 5'NH2 linked DNA probe. Modification of SPPE using GQDs@AuNPs nanocomposite and ssDNA probe was monitored using EIS, FTIR, FE-SEM and AFM. The sensor detection limit (LOD) was assessed as 0.002 ng/μl from the standard calibration curve with the correlation coefficient, R2 = 0.993. The sensitivity of the DNA sensor was calculated as 7700 μA/cm2/ng for ssGDNA of O. tsutsugamushi using cyclic voltammetry. The sensor validation was done using scrub typhus patient's blood DNA samples. The sensor showed good storage stability at 4 °C for six months with just a loss of 12% of the initial current values. The SPPE/DNA sensor developed is very specific, sensitive, stable and detects O. tsutsugamushi in less time.
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