Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 40, Pages 36299-36306Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b09492
Keywords
dual-potential ratiometric ECL aptasensor; resonance energy transfer; g-C3N4 NS; Ru@MOF; amyloid-beta protein
Funding
- Shanghai Science and Technology Committee [17070503000, 18dz2308700]
- Shanghai Government [18DZ2254200]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_16R49]
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A dual-wavelength ratiometric electrochemiluminescence resonance energy transfer (ECL-RET) aptasensor based on the carbon nitride nanosheet (g-C3N4 NS) and metal-organic frameworks (Ru@ MOFs) as energy donor-receptor pairs is first designed for the detection of the amyloid-beta (A beta) protein. The cathode ECL of g-C3N4 NS gradually decreased, whereas the anode ECL from Ru@MOF pyramidally enhanced along with the increasing concentration of A beta in a 0.1 M phosphate-buffered saline solution containing 0.1 M S2O82-. Additionally, it is worth noting that 2-amino terephthalic acid from MOF not only can load abundant amounts of luminophor Ru(bpy)(3)(2+) but also promote the conversion of more amounts of S2O82- that served as a coreactant accelerator into SO4 center dot- further enhancing the ECL signal of Ru@MOF. Besides, the ECL intensity from the g-C3N4 NS had a tremendous spectrum overlap with the UV-vis spectrum of Ru@MOF, demonstrating the high-efficiency ECL-RET from g-C3N4 NS to Ru@MOF. According to the ratio of ECL460nm/ECL60nm, n the constructed aptasensor for the detection of A beta showed a wide linear range from 10(-5) to 500 ng/mL and a low detection limit of 3.9 fg/mL (S/N = 3) with a correction coefficient of 0.9965. The obtained results certified that the dual-wavelength ratiometric ECL sensor could provide a reliable direction and have the potential for application in biosensing and clinical diagnosis fields.
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