| Autor: |
Piloto AML; BioMark Sensor Research, School of Engineering of the Polytechnic Institute of Porto, 4249-015 Porto, Portugal.; CEB, Centre of Biological Engineering, Minho University, 4710-057 Braga, Portugal., Ribeiro DSM; Associated Laboratory for Green Chemistry LAQV-REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, Porto University, 4050-313 Porto, Portugal., Rodrigues SSM; Associated Laboratory for Green Chemistry LAQV-REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, Porto University, 4050-313 Porto, Portugal., Santos JLM; Associated Laboratory for Green Chemistry LAQV-REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, Porto University, 4050-313 Porto, Portugal., Sampaio P; i3S-Institute for Research and Innovation in Health, Porto University, 4200-135 Porto, Portugal.; IBMC-Institute of Molecular and Cell Biology, Porto University, 4200-135 Porto, Portugal., Sales G; BioMark Sensor Research, School of Engineering of the Polytechnic Institute of Porto, 4249-015 Porto, Portugal.; CEB, Centre of Biological Engineering, Minho University, 4710-057 Braga, Portugal.; BioMark/UC, Department of Chemical Engineering, Faculty of Sciences and Technology, University of Coimbra, 3030-790 Coimbra, Portugal. |
| Abstrakt: |
In this work, the conjugation of molecularly imprinted polymers (MIPs) to quantum dots (QDs) was successfully applied in the assembly of an imprinted cellulose membrane [hydroxy ethyl cellulose (HEC)/MIP@QDs] for the specific recognition of the cardiac biomarker myoglobin (Myo) as a sensitive, user-friendly, and portable system with the potential for point-of-care (POC) applications. The concept is to use the MIPs as biorecognition elements, previously prepared on the surface of semiconductor cadmium telluride QDs as detection particles. The fluorescent quenching of the membrane occurred with increasing concentrations of Myo, showing linearity in the interval range of 7.39-291.3 pg/mL in a1000-fold diluted human serum. The best membrane showed a linear response below the cutoff values for myocardial infarction (23 ng/mL), a limit of detection of 3.08 pg/mL, and an imprinting factor of 1.65. The incorporation of the biorecognition element MIPs on the cellulose substrate brings an approach toward a portable and user-friendly device in a sustainable manner. Overall, the imprinted membranes display good stability and selectivity toward Myo when compared with the nonimprinted membranes (HEC/NIP@QDs) and have the potential to be applied as a sensitive system for Myo detection in the presence of other proteins. Moreover, the conjugation of MIPs to QDs increases the sensitivity of the system for an optical label-free detection method, reaching concentration levels with clinical significance. |
