Aptamer-based SERRS sensor for thrombin detection.

Aptamer-based SERRS sensor for thrombin detection.
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DOI:
10.1021/nl802245w
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发表时间:
2008-12
期刊:
影响因子:
10.8
通讯作者:
Tok JB
Tok JB
中科院分区:
材料科学1区
文献类型:
--
作者:
Cho H;Baker BR;Wachsmann-Hogiu S;Pagba CV;Laurence TA;Lane SM;Lee LP;Tok JB

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我们描述了一种基于适配体的表面增强共振拉曼散射(SERRS)传感器,具有高灵敏度,特异性和稳定性,用于检测凝血蛋白,人α-凝血酶。该传感器通过监测凝血酶结合到固定化凝血酶结合适体的单步SERRS信号变化,实现了高灵敏度和100 pM的检测限。通过对凝血酶与其他蛋白质分析物的特异性区分,证明了该传感器的选择性。凝血酶结合适体对凝血酶的特异性识别和结合对基于适体的传感器的机制至关重要,通过使用阴性对照寡核苷酸的测量可以看出。此外,该传感器可以在复杂的生物流体(如10%的胎牛血清)存在下检测1 nM的凝血酶,这表明固定化的5‘端和3’端适配体足以用于临床诊断应用。此外,所提出的传感器可以使用不同的适配体-拉曼探针配合物实现多路检测。
We describe an aptamer-based Surface Enhanced Resonance Raman Scattering (SERRS) sensor with high sensitivity, specificity, and stability for the detection of a coagulation protein, human α-thrombin. The sensor achieves high sensitivity and a limit of detection of 100 pM by monitoring the SERRS signal change upon the single step of thrombin binding to immobilized thrombin binding aptamer. The selectivity of the sensor is demonstrated by the specific discrimination of thrombin from other protein analytes. The specific recognition and binding of thrombin by the thrombin binding aptamer is essential to the mechanism of the aptamer-based sensor, as shown through measurements using negative control oligonucleotides. In addition, the sensor can detect 1 nM thrombin in the presence of complex biofluids, such as 10% fetal calf serum, demonstrating that the immobilized, 5'-capped, 3'-capped aptamer is sufficiently robust for clinical diagnostic applications. Furthermore, the proposed sensor may be implemented for multiplexed detection using different aptamer-Raman probe complexes.
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