Single-walled carbon nanotube chemoresistive label-free immunosensor for salivary stress biomarkers.

Single-walled carbon nanotube chemoresistive label-free immunosensor for salivary stress biomarkers.
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用于唾液应激生物标志物的单壁碳纳米管化学电阻无标记免疫传感器。

DOI:
10.1039/c0an00332h
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发表时间:
2010
期刊:
The Analyst
影响因子:
--
通讯作者:
Mulchandani,Ashok
Mulchandani,Ashok
中科院分区:
--
文献类型:
--
作者:
Tlili,Chaker;Cella,LakshmiN;Myung,NosangV;Shetty,Vivek;Mulchandani,Ashok

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本研究旨在研制一种选择性、高灵敏度的单壁碳纳米管-化学电阻免疫传感器,用于唾液α-淀粉酶(SAA)的无标记检测。将单壁碳纳米管对齐,以使用AC介电电泳桥接光刻图案化的金微电极,然后用抗SAA抗体官能化。纳米免疫传感器在临床相关范围(19至308 U ml−1)内表现出优异的灵敏度,在磷酸盐缓冲液和人工唾液中的检测限(LOD)分别为6 µg ml−1(0.6 U ml−1)和7.8 µg ml−1(0.78 U ml−1),并且没有唾液其他成分的干扰。这种无标记的纳米免疫传感器技术在临床诊断中具有潜在的应用价值,可以在床旁检测人类唾液中表达的应激生物标志物。
The present work is focused on the development, analytical characterization and evaluation of selective and sensitive SWNT-chemiresistor immunosensor for the label-free detection of salivary α-amylase (SAA). SWNTs were aligned to bridge lithographically patterned gold microelectrodes using AC dielectrophoresis followed by functionalization with anti-SAA antibodies. The nano-immunosensors exhibited excellent sensitivity over the clinically relevant range (19 to 308 U ml−1) with a limit of detection (LOD) of 6 µg ml−1 (0.6 U ml−1) and 7.8 µg ml−1 (0.78 U ml−1) in phosphate buffer and artificial saliva, respectively, and no interference from other components of saliva. This label-free nano-immunosensor technology has potential application in clinical diagnosis for stress biomarkers expressed in human saliva at the point-of-care.
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