Photoconjugation of Molecularly Imprinted Polymer Nanoparticles for Surface-Enhanced Raman Detection of Propranolol
2015 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, no 49, 27479-27485 p.Article in journal (Refereed) PublishedText
We report a simple and versatile method to covalently immobilize molecularly imprinted polymer (MIP) nanoparticles on a Raman active substrate (Klarite) using a disulfide-derivatized perfluorophenylazide (PFPA-disulfide). Gold-coated Klarite was functionalized with PFPA-disulfide via a gold sulfur bond. Upon light radiation, the available azido groups were converted to highly reactive singlet perfluorophenyl nitrene that undergoes a CH insertion reaction and form covalent bonds with the MIP nanoparticles. The resulting surfaces were characterized using scanning electron microscopy and surface enhanced Raman spectroscopy to study the morphology and template affinity of the surfaces, respectively. The Raman measurements clearly show a dose-responsive signal when propranolol binds to the MIP surface. Because the MIP particles were covalently attached to the Raman active substrate, the sensing surface was stable and could be reused after regeneration in acetic acid solution. The MIP-based Raman sensor was used successfully to detect propranolol in urine samples (7.7 X 10(-4) M). Our results show that the high selectivity of MLPs and the fingerprint Raman identification can be integrated into a compact sensing unit using high-efficiency photoconjugation. Thus, the method proposed is reliable, efficient and fast for fabricating label-free chemical sensors.
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2015. Vol. 7, no 49, 27479-27485 p.
molecularly imprinted polymers, propranolol, perfluorophenylazide disulfide, photocoupling, Klarite, surface-enhanced Raman spectroscopy, urine
IdentifiersURN: urn:nbn:se:kth:diva-180489DOI: 10.1021/acsami.5b09500ISI: 000366873900054ScopusID: 2-s2.0-84950269220OAI: oai:DiVA.org:kth-180489DiVA: diva2:895156
QC 201601182016-01-182016-01-142016-01-18Bibliographically approved