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Bifunctional aptasensor based on novel two-dimensional nanocomposite of MoS 2 quantum dots and g-C 3 N 4 nanosheets decorated with chitosan-stabilized Au nanoparticles for selectively detecting prostate specific antigen
Analytica Chimica Acta ( IF 6.2 ) Pub Date : 2018-12-01 , DOI: 10.1016/j.aca.2018.06.070
Fenghe Duan , Shuai Zhang , Longyu Yang , Zhihong Zhang , Linghao He , Minghua Wang

A novel nanostructured biosensing platform was designed based on two-dimensional (2D) nanocomposite of graphitic carbon nitride (g-C3N4) nanosheets and MoS2 quantum dots (MoS2 QDs), followed by decoration with chitosan-stabilized Au nanoparticles (CS-AuNPs) (denoted as MoS2QDs@g-C3N4@CS-AuNPs), of which CS-AuNPs were prepared by plasma enhanced-chemical vapor deposition. Owning to the good surface plasmon performance of the CS-AuNPs and excellent electrochemical activity of MoS2QDs@g-C3N4 nanosheets, the as-obtained 2D MoS2QDs@g-C3N4@CS-AuNPs nanocomposite was simultaneously explored to construct both surface plasmon resonance spectroscopy (SPR) sensor and electrochemical aptasensor. The MoS2QDs@g-C3N4@CS-AuNPs-based aptasensor shows strong bio-binding affinity toward the prostate specific antigen (PSA) targeted aptamer strands as compared to the individual component, including MoS2 QDs, g-C3N4, and CS-AuNPs. When detecting PSA, the low limit of detection (LOD) of 0.71 pg mL-1 deduced by electrochemical aptasensor is three orders of magnitude lower than that deduced by SPR sensor (0.77 ng mL-1). As expected, both SPR sensor and electrochemical aptasensor demonstrate good selectivity, highly stability, acceptable reproducibility, and well consistent applicability in human serum. The satisfactory results suggest potential application of the MoS2QDs@g-C3N4@CS-AuNPs in bifunctional biosensing fields and clinical monitoring of cancer markers.

中文翻译:

基于MoS 2 量子点和gC 3 N 4 纳米片的新型二维纳米复合材料的双功能适体传感器,饰以壳聚糖稳定的Au 纳米颗粒,用于选择性检测前列腺特异性抗原

基于石墨氮化碳 (g-C3N4) 纳米片和 MoS2 量子点 (MoS2 QDs) 的二维 (2D) 纳米复合材料设计了一种新型纳米结构生物传感平台,然后用壳聚糖稳定的 Au 纳米颗粒 (CS-AuNPs) 装饰(表示为 MoS2QDs@g-C3N4@CS-AuNPs),其中 CS-AuNPs 是通过等离子体增强化学气相沉积制备的。由于CS-AuNPs良好的表面等离子体性能和MoS2QDs@g-C3N4纳米片优异的电化学活性,所获得的二维MoS2QDs@g-C3N4@CS-AuNPs纳米复合材料同时被用于构建两种表面等离子体共振光谱( SPR) 传感器和电化学适体传感器。与单个组件(包括 MoS2 QD、g-C3N4 和 CS-AuNP)相比,基于 MoS2QDs@g-C3N4@CS-AuNPs 的适体传感器显示出对前列腺特异性抗原 (PSA) 靶向适体链的强大生物结合亲和力。检测PSA时,电化学适体传感器推导出的检测下限(LOD)为0.71 pg mL-1,比SPR传感器推导出的检测下限(0.77 ng mL-1)低三个数量级。正如预期的那样,SPR 传感器和电化学适体传感器都表现出良好的选择性、高稳定性、可接受的重现性以及在人血清中的一致性适用性。令人满意的结果表明 MoS2QDs@g-C3N4@CS-AuNPs 在双功能生物传感领域和癌症标志物的临床监测中的潜在应用。电化学适体传感器推导出的检测下限(LOD)为0.71 pg mL-1,比SPR传感器推导出的检测下限(0.77 ng mL-1)低三个数量级。正如预期的那样,SPR 传感器和电化学适体传感器都表现出良好的选择性、高度的稳定性、可接受的重现性以及在人血清中的一致性适用性。令人满意的结果表明 MoS2QDs@g-C3N4@CS-AuNPs 在双功能生物传感领域和癌症标志物的临床监测中的潜在应用。电化学适体传感器推导出的检测下限(LOD)为0.71 pg mL-1,比SPR传感器推导出的检测下限(0.77 ng mL-1)低三个数量级。正如预期的那样,SPR 传感器和电化学适体传感器都表现出良好的选择性、高稳定性、可接受的重现性以及在人血清中的一致性适用性。令人满意的结果表明 MoS2QDs@g-C3N4@CS-AuNPs 在双功能生物传感领域和癌症标志物的临床监测中的潜在应用。并且在人血清中具有良好的一致性适用性。令人满意的结果表明 MoS2QDs@g-C3N4@CS-AuNPs 在双功能生物传感领域和癌症标志物的临床监测中的潜在应用。并且在人血清中具有良好的一致性适用性。令人满意的结果表明 MoS2QDs@g-C3N4@CS-AuNPs 在双功能生物传感领域和癌症标志物的临床监测中的潜在应用。
更新日期:2018-12-01
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