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測量應用案例-20200403
閱讀：172 發布時間：2020-4-9| 提 供 商 | 美國布魯克海文儀器公司 | 資料大小 | 8.4MB |
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作者： Kaiyang Chena, Jiyang Xueb, Qing Zhoua, Yue Zhanga, Mingming Zhanga, Yuanjian Zhanga, Hai Zhangb, Yanfei Shena
a Medical School, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 210009, China
b Department of Pharmacy, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, 201204, China
摘要：A “signal-on” photoelectrochemical (PEC) immunosensor for highly sensitive detection of Human Epididymis Protein 4 (HE4), a new serum biomarker of ovarian cancer with small molecular weight, was fabricated by coupling the porphyrin-based metal-organic framework (MOF) nanosphere (nPCN-224) and Nanobody (Nb). To label the Nb, the nPCN-224 with an average size of 160–200 nm was prepared by solvothermal method. The mechanism for the photocurrent generation of nPCN-224 was systematically investigated, showing that the dissolved O2 in aqueous solution participated in the charge separation and transport during the photoelectric conversion by generating O2˙-, which resulted in a 6-fold enhanced photocurrent by using ascorbic acid as the O2 ˙- scavenger. Moreover, the inherent structural porosity of nPCN-224 demonstrated advantage for reactant accessibility. Due to the superior properties of nPCN-224, and the high specificity and affinity of Nbs, the immunosensor exhibited a broad detection range from 1.00 pg mL−1 to 10.0 ng mL−1 and a detection limit of 0.560 pg mL−1, lower than most methods reported before. The immunosensor could clearly distinguish ovarian cancer patients in different stages from healthy individuals, and the as-obtained results matched well with those by traditional electrochemiluminescence immunoassay method from the hospital. This work would open a new avenue for PEC immunosensors in clinical diagnostics and evaluation of potential clinical efficacy.