Thrombin
is a marker of blood-related diseases, and its detection
is of great significance in the fields of medical and biological research.
Herein, a novel chemiluminescence (CL) sensor for thrombin detection
was prepared based on dual-aptamer biorecognition and mesoporous silica
encapsulated with iron porphyrin. Mesoporous silica encapsulated with
hematin by aptamer1 (Apt1/hematin/M-SiO2) and magnetic
microspheres modified with aptamer2 (Apt2/NH2-MS) were
successfully prepared, and the two materials were used to construct
a CL sensor to detect thrombin. Primarily, Apt2/NH2-MS
is used for pretreatment separation of thrombin samples by the biorecognition
effect between the aptamer (Apt2) and target (thrombin). Then, thrombin/Apt2/NH2-MS is again recognized with Apt1 on the surface of Apt1/hematin/M-SiO2 and Apt1/thrombin/Apt2/NH2-MS is formed, so dual-aptamer
biorecognition is realized. Meanwhile, the generated Apt1/thrombin/Apt2/NH2-MS makes Apt1 shed off the surface of M-SiO2 and
release hematin. The released hematin can catalyze the luminol-H2O2 CL reaction. Therefore, a sandwich-type CL sensor
was constructed based on dual-aptamer biorecognition and hematin catalysis
for the detection of thrombin. The sensor has a linear range of 7.5
× 10–15 to 2.5 × 10–10 mol·L–1 and a detection limit of 2.2 ×
10–15 mol·L–1 and also exhibits
excellent selectivity, reproducibility, and stability. The sensor
was successfully used for the detection of thrombin in serum samples,
which makes it possible to apply the sensor in the detection of thrombin
in actual samples.
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