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Detection of dengue using PAMAM dendrimer integrated tapered optical fiber sensor. Sci Rep 2019; 9:13483. [PMID: 31530893 PMCID: PMC6748962 DOI: 10.1038/s41598-019-49891-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 08/31/2019] [Indexed: 11/08/2022] Open
Abstract
The exponential escalation of dengue cases has indeed become a global health crisis. This work elaborates on the development of a biofunctionalized tapered optical fiber (TOF) based sensor with the integration of polyamidoamine (PAMAM) dendrimer for the detection of dengue E protein. The dimension of the TOF generated an evanescent field that was sensitive to any changes in the external medium while the integration of PAMAM promoted more adhesion of bio-recognition molecules; anti-DENV II E protein antibodies; that were complementary to the targeted protein. This in return created more active sites for the absorption of DENV II E proteins onto the tapered region. The resolution and detection limit of the sensor are 19.53 nm/nM and 1 pM, respectively with Kd = 1.02 × 10-10 M.
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Sobarzo PA, González AF, Schott E, Tagle LH, Tundidor-Camba A, González-Henríquez C, Jessop IA, Terraza CA. New Triphenylamine-Based Oligomeric Schiff Bases Containing Tetraphenylsilane Moieties in the Backbone. Polymers (Basel) 2019; 11:E216. [PMID: 30960202 PMCID: PMC6419043 DOI: 10.3390/polym11020216] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 01/18/2019] [Accepted: 01/24/2019] [Indexed: 11/17/2022] Open
Abstract
Three new triphenylamine-based oligomeric Schiff bases (polySB1, polySB2 and polySB3) containing tetraphenylsilane core (TPS-core) in the main chain were obtained from TPS-core-based diamines and bis(4-formylphenyl)phenylamine by a high-temperature polycondensation reaction. These new oligomers were structurally characterized by FT-IR, NMR and elemental analysis. All polySBs were highly soluble in common organic solvents, such as chloroform, tetrahydrofuran and chlorobenzene. Samples showed moderate molecular average molecular weight (Mw) and a high thermal stability above 410 °C. Likewise, polySBs showed absorption near 400 nm in the UV-vis range and photoluminescence. The HOMO levels and band-gap values were found in the ranges of -6.06 to -6.18 eV and 2.65⁻2.72 eV, respectively. The lowest band-gap value was observed for polySB2, which could be attributed to a more effective π-conjugation across the main chain. The results suggest that silicon-containing polySBs are promising wide-band-gap semiconductors materials for optoelectronic applications.
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Affiliation(s)
- Patricio A Sobarzo
- Research Laboratory for Organic Polymers, Pontificia Universidad Católica de Chile, P.O. Box 306, Post 22, Santiago, Chile.
| | - Alexis F González
- Research Laboratory for Organic Polymers, Pontificia Universidad Católica de Chile, P.O. Box 306, Post 22, Santiago, Chile.
| | - Eduardo Schott
- Department of Inorganic Chemistry, Pontificia Universidad Católica de Chile, P.O. Box 306, Post 22, Santiago, Chile.
| | - Luis H Tagle
- Research Laboratory for Organic Polymers, Pontificia Universidad Católica de Chile, P.O. Box 306, Post 22, Santiago, Chile.
| | - Alain Tundidor-Camba
- Research Laboratory for Organic Polymers, Pontificia Universidad Católica de Chile, P.O. Box 306, Post 22, Santiago, Chile.
- UC Energy Research Center, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Carmen González-Henríquez
- Laboratory of Nanotechnology and Advanced Materials, Universidad Tecnológica Metropolitana, P.O. Box 9845, Post 21, Santiago, Chile.
| | - Ignacio A Jessop
- Laboratorio de Materiales Orgánicos y Poliméricos, Department of Chemistry, Faculty of Chemistry, Universidad de Tarapacá, P.O. Box 7-D, Arica, Chile.
| | - Claudio A Terraza
- Research Laboratory for Organic Polymers, Pontificia Universidad Católica de Chile, P.O. Box 306, Post 22, Santiago, Chile.
- UC Energy Research Center, Pontificia Universidad Católica de Chile, Santiago, Chile.
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Poltorak L, Herzog G, Walcarius A. Electrochemically assisted generation of silica deposits using a surfactant template at liquid/liquid microinterfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:11453-63. [PMID: 25229369 DOI: 10.1021/la501938g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The electrochemically assisted generation of mesoporous silica deposits at arrays of microscopic liquid/liquid interfaces was investigated. Ion transfer voltammetry was used in order to initiate the formation of silica material by electrochemical transfer of template species (cetyltrimethylammonium, CTA(+)), initially present in the organic phase, to the aqueous phase containing the hydrolyzed silica precursors (tetraethoxysilane, TEOS). The deposition mechanism was investigated using cyclic voltammetry, based on the analysis of diffusion layer profiles of CTA(+) species from the organic side of the interface. The morphology of the deposits varied from hemispherical to almost flat with the potential scan rate, the spacing factor of the microinterfaces array supporting the liquid/liquid interfaces, or the initial CTA(+) and TEOS concentrations, as evidenced by scanning electron microscopy and profilometry analyses. The amount of deposited material can be related to the amount of CTA(+) species passing across the liquid/liquid interfaces. Confocal Raman spectroscopy was used to confirm the presence of surfactant-templated silica deposits and to analyze the effectiveness of calcination in removing the organic molecules filling the interior of the pores. After template removal, the mesoporous network became accessible to external reagents, as checked by interfacial alkylammonium cation transfer, suggesting a possible analytical interest of such modified micro-liquid/liquid interfaces.
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Affiliation(s)
- Lukasz Poltorak
- Laboratoire de Chimie Physique et Microbiologie pour l'Environnement (LCPME), UMR 7564, CNRS - Université de Lorraine, 405 rue de Vandoeuvre, 54600 Villers-les-Nancy, France
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