Highly sensitive antibody-aptamer sensor for vascular endothelial growth factor based on hybridization chain reaction and pH meter/indicator

作者：Xu, Huifeng; Kou, Fangxia; Ye, Hongzhi; Wang, Zongwen; Huang, Suixin; Liu, Xianxiang^*; Zhu, Xi^*; Lin, Zhenyu; Chen, Guonan

来源：Talanta, 2017, 175: 177-182.

DOI：10.1016/j.talanta.2017.04.073

• Vascular endothelial growth factor
• Aptamer
• Immunosensor
• Hybridization chain reaction
• pH meter/indicator

Vascular endothelial growth factor (VEGF) is a crucial signaling protein for the tumor growth and metastasis, which is also acted as the biomarkers for various diseases. In this research, we fabricate an aptamer-antibody sensor for point-of-care test of VEGF. Firstly, target VEGF is captured by antibody immobilized on the microplate, and then binds with aptamer to form the sandwich structure. Next, with the assist of glucose oxidase (GOx)-functionalized ssDNAs, hybridization chain reaction occurs using the aptamer as the primer. Thus, GOx are greatly gathered on the microplate, which catalyzes the oxidization of glucose, leading to the pH change. As a result, the detect limit at a signal-to-noise was estimated to be 0.5 pg/mL of target by pH meter, and 1.6 pg/mL of VEGF was able to be distinguished by naked eyes. Meanwhile, this method has been used assay VEGF in the serum with the satisfactory results.

• 出版日期2017-12-1
• 单位福州大学; 福建中医药大学; 福建农林大学