1
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Gonzalez Solveyra E, Perez Sirkin YA, Tagliazucchi M, Szleifer I. Orientational Pathways during Protein Translocation through Polymer-Modified Nanopores. ACS NANO 2024; 18:10427-10438. [PMID: 38556978 DOI: 10.1021/acsnano.3c11318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Protein translocation through nanopores holds significant promise for applications in biotechnology, biomolecular analysis, and medicine. However, the interpretation of signals generated by the translocation of the protein remains challenging. In this way, it is crucial to gain a comprehensive understanding on how macromolecules translocate through a nanopore and to identify what are the critical parameters that govern the process. In this study, we investigate the interplay between protein charge regulation, orientation, and nanopore surface modifications using a theoretical framework that allows us to explicitly take into account the acid-base reactions of the titrable amino acids in the proteins and in the polyelectrolytes grafted to the nanopore surface. Our goal is to thoroughly characterize the translocation process of different proteins (GFP, β-lactoglobulin, lysozyme, and RNase) through nanopores modified with weak polyacids. Our calculations show that the charge regulation mechanism exerts a profound effect on the translocation process. The pH-dependent interactions between proteins and charged polymers within the nanopore lead to diverse free energy landscapes with barriers, wells, and flat regions dictating translocation efficiency. Comparison of different proteins allows us to identify the significance of protein isoelectric point, size, and morphology in the translocation behavior. Taking advantage of these insights, we propose pH-responsive nanopores that can load proteins at one pH and release them at another, offering opportunities for controlled protein delivery, separation, and sensing applications.
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Affiliation(s)
- Estefania Gonzalez Solveyra
- Instituto de Nanosistemas, Universidad Nacional de San Martín-CONICET, San Martín, Buenos Aires B1650, Argentina
| | - Yamila A Perez Sirkin
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Química Inorgánica Analítica y Química Física y CONICET-Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Instituto de Química de los Materiales, Ambiente y Energía (INQUIMAE). Pabellón 2, Ciudad Universitaria, C1428 Ciudad Autónoma de Buenos Aires, Argentina
| | - Mario Tagliazucchi
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Química Inorgánica Analítica y Química Física y CONICET-Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Instituto de Química de los Materiales, Ambiente y Energía (INQUIMAE). Pabellón 2, Ciudad Universitaria, C1428 Ciudad Autónoma de Buenos Aires, Argentina
| | - Igal Szleifer
- Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
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2
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Ward SJ, Cao T, Zhou X, Chang C, Weiss SM. Protein Identification and Quantification Using Porous Silicon Arrays, Optical Measurements, and Machine Learning. BIOSENSORS 2023; 13:879. [PMID: 37754113 PMCID: PMC10526835 DOI: 10.3390/bios13090879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 09/02/2023] [Accepted: 09/05/2023] [Indexed: 09/28/2023]
Abstract
We report a versatile platform based on an array of porous silicon (PSi) thin films that can identify analytes based on their physical and chemical properties without the use of specific capture agents. The ability of this system to reproducibly classify, quantify, and discriminate three proteins separately is demonstrated by probing the reflectance of PSi array elements with a unique combination of pore size and buffer pH, and by analyzing the optical signals using machine learning. Protein identification and discrimination are reported over a concentration range of two orders of magnitude. This work represents a significant first step towards a low-cost, simple, versatile, and robust sensor platform that is able to detect biomolecules without the added expense and limitations of using capture agents.
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Affiliation(s)
- Simon J. Ward
- Department of Electrical and Computer Engineering, Vanderbilt University, Nashville, TN 37235, USA; (S.J.W.)
| | - Tengfei Cao
- Interdisciplinary Material Science Program, Vanderbilt University, Nashville, TN 37235, USA
| | - Xiang Zhou
- Department of Chemistry, Vanderbilt University, Nashville, TN 37235, USA
| | - Catie Chang
- Department of Electrical and Computer Engineering, Vanderbilt University, Nashville, TN 37235, USA; (S.J.W.)
| | - Sharon M. Weiss
- Department of Electrical and Computer Engineering, Vanderbilt University, Nashville, TN 37235, USA; (S.J.W.)
- Interdisciplinary Material Science Program, Vanderbilt University, Nashville, TN 37235, USA
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3
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Mazzotta E, Di Giulio T, Mariani S, Corsi M, Malitesta C, Barillaro G. Vapor-Phase Synthesis of Molecularly Imprinted Polymers on Nanostructured Materials at Room-Temperature. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2302274. [PMID: 37222612 DOI: 10.1002/smll.202302274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 04/27/2023] [Indexed: 05/25/2023]
Abstract
Molecularly imprinted polymers (MIPs) have recently emerged as robust and versatile artificial receptors. MIP synthesis is carried out in liquid phase and optimized on planar surfaces. Application of MIPs to nanostructured materials is challenging due to diffusion-limited transport of monomers within the nanomaterial recesses, especially when the aspect ratio is >10. Here, the room temperature vapor-phase synthesis of MIPs in nanostructured materials is reported. The vapor phase synthesis leverages a >1000-fold increase in the diffusion coefficient of monomers in vapor phase, compared to liquid phase, to relax diffusion-limited transport and enable the controlled synthesis of MIPs also in nanostructures with high aspect ratio. As proof-of-concept application, pyrrole is used as the functional monomer thanks to its large exploitation in MIP preparation; nanostructured porous silicon oxide (PSiO2 ) is chosen to assess the vapor-phase deposition of PPy-based MIP in nanostructures with aspect ratio >100; human hemoglobin (HHb) is selected as the target molecule for the preparation of a MIP-based PSiO2 optical sensor. High sensitivity and selectivity, low detection limit, high stability and reusability are achieved in label-free optical detection of HHb, also in human plasma and artificial serum. The proposed vapor-phase synthesis of MIPs is immediately transferable to other nanomaterials, transducers, and proteins.
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Affiliation(s)
- Elisabetta Mazzotta
- Laboratory of Analytical Chemistry, Department of Biological and Environmental Sciences and Technologies (Di.S.Te.B.A.), University of Salento, via Monteroni, Lecce, 73100, Italy
| | - Tiziano Di Giulio
- Laboratory of Analytical Chemistry, Department of Biological and Environmental Sciences and Technologies (Di.S.Te.B.A.), University of Salento, via Monteroni, Lecce, 73100, Italy
| | - Stefano Mariani
- Information Engineering Department, University of Pisa, via G. Caruso 16, Pisa, 56122, Italy
| | - Martina Corsi
- Information Engineering Department, University of Pisa, via G. Caruso 16, Pisa, 56122, Italy
| | - Cosimino Malitesta
- Laboratory of Analytical Chemistry, Department of Biological and Environmental Sciences and Technologies (Di.S.Te.B.A.), University of Salento, via Monteroni, Lecce, 73100, Italy
| | - Giuseppe Barillaro
- Information Engineering Department, University of Pisa, via G. Caruso 16, Pisa, 56122, Italy
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4
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Feng S, Ji W. Advanced Nanoporous Anodic Alumina-Based Optical Sensors for Biomedical Applications. FRONTIERS IN NANOTECHNOLOGY 2021. [DOI: 10.3389/fnano.2021.678275] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Close-packed hexagonal array nanopores are widely used both in research and industry. A self-ordered nanoporous structure makes anodic aluminum oxide (AAO) one of the most popular nanomaterials. This paper describes the main formation mechanisms for AAO, the AAO fabrication process, and optical sensor applications. The paper is focused on four types of AAO-based optical biosensor technology: surface-Enhanced Raman Scattering (SERS), surface Plasmon Resonance (SPR), reflectometric Interference Spectroscopy (RIfS), and photoluminescence Spectroscopy (PL). AAO-based optical biosensors feature very good selectivity, specificity, and reusability.
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5
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Bezem MT, Johannessen FG, Kråkenes TA, Sailor MJ, Martinez A. Relevance of Electrostatics for the Interaction of Tyrosine Hydroxylase with Porous Silicon Nanoparticles. Mol Pharm 2021; 18:976-985. [PMID: 33417459 PMCID: PMC7927144 DOI: 10.1021/acs.molpharmaceut.0c00960] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
![]()
Tyrosine hydroxylase (TH) is the
enzyme catalyzing the rate-limiting
step in the synthesis of dopamine in the brain. Developing enzyme
replacement therapies using TH could therefore be beneficial to patient
groups with dopamine deficiency, and the use of nanocarriers that
cross the blood–brain barrier seems advantageous for this purpose.
Nanocarriers may also help to maintain the structure and function
of TH, which is complex and unstable. Understanding how TH may interact
with a nanocarrier is therefore crucial for the investigation of such
therapeutic applications. This work describes the interaction of TH
with porous silicon nanoparticles (pSiNPs), chosen since they have
been shown to deliver other macromolecular therapeutics successfully
to the brain. Size distributions obtained by dynamic light scattering
show a size increase of pSiNPs upon addition of TH and the changes
observed at the surface of pSiNPs by transmission electron microscopy
also indicated TH binding at pH 7. As pSiNPs are negatively charged,
we also investigated the binding at pH 6, which makes TH less negatively
charged than at pH 7. However, as seen by thioflavin-T fluorescence,
TH aggregated at this more acidic pH. TH activity was unaffected by
the binding to pSiNPs most probably because the active site stays
available for catalysis, in agreement with calculations of the surface
electrostatic potential pointing to the most positively charged regulatory
domains in the tetramer as the interacting regions. These results
reveal pSiNPs as a promising delivery device of enzymatically active
TH to increase local dopamine synthesis.
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Affiliation(s)
- Maria T Bezem
- Department of Biomedicine, University of Bergen, Jonas Lies vei 91, Bergen 5009, Norway
| | - Fredrik G Johannessen
- Department of Biomedicine, University of Bergen, Jonas Lies vei 91, Bergen 5009, Norway
| | - Trond-André Kråkenes
- Department of Biomedicine, University of Bergen, Jonas Lies vei 91, Bergen 5009, Norway
| | - Michael J Sailor
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Aurora Martinez
- Department of Biomedicine, University of Bergen, Jonas Lies vei 91, Bergen 5009, Norway
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6
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Yamaguchi A, Saiga M, Inaba D, Aizawa M, Shibuya Y, Itoh T. Structural Characterization of Proteins Adsorbed at Nanoporous Materials. ANAL SCI 2021; 37:49-59. [PMID: 33431779 DOI: 10.2116/analsci.20sar05] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 09/19/2020] [Indexed: 11/23/2022]
Abstract
A nanoporous material has been applied for the development of functional nanobiomaterials by utilizing its uniform pore structure and large adsorption capacity. The structure and stability of biomacromolecules, such as peptide, oligonucleotide, and protein, are primary factors to govern the performance of nanobiomaterials, so that their direct characterization methodologies are in progress. In this review, we focus on recent topics in the structural characterization of protein molecules adsorbed at a nanoporous material with uniform meso-sized pores. The thermal stabilities of the adsorbed proteins are also summarized to discuss whether the structure of the adsorbed protein molecules can be stabilized or not.
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Affiliation(s)
- Akira Yamaguchi
- Institute of Quantum Beam Science, Ibaraki University, 2-1-1, Bunkyo, Mito, Ibaraki, 310-8512, Japan.
| | - Masahiro Saiga
- Institute of Quantum Beam Science, Ibaraki University, 2-1-1, Bunkyo, Mito, Ibaraki, 310-8512, Japan
| | - Daiki Inaba
- Institute of Quantum Beam Science, Ibaraki University, 2-1-1, Bunkyo, Mito, Ibaraki, 310-8512, Japan
| | - Mami Aizawa
- Institute of Quantum Beam Science, Ibaraki University, 2-1-1, Bunkyo, Mito, Ibaraki, 310-8512, Japan
| | - Yuta Shibuya
- New Industry Creation Hatchery Center, Tohoku University, 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan
| | - Tetsuji Itoh
- National Institute of Advanced Industrial Science and Technology (AIST), 4-2-1 Nigatake, Miyagino, Sendai, 983-8551, Japan
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7
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Yamaguchi A, Katayama K, Holt SA. In-situ Neutron Reflectometry Study on Adsorption of Glucose Oxidase at Mesoporous Aluminum Oxide Film. ANAL SCI 2020; 36:1331-1336. [PMID: 32536623 DOI: 10.2116/analsci.20p160] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In the present study, the adsorption of glucose oxidase (GOD) to a mesoporous aluminum oxide (MAO) film was examined with in-situ neutron reflectometry (NR) measurements. The MAO film was deposited on a cover glass slip and a Si disc, and its pore structure was characterized by X-ray reflectometry (XRR) and NR. The Si disc with MAO film was applied for an in-situ NR experiment, and its NR profiles before/after adsorption of GOD were continuously measured with a flow cell. The results indicated that the negatively-charged GOD molecules hardly penetrate into the narrow pore channel (pore diameter = ca. 10 nm) with opposite surface charge.
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Affiliation(s)
| | | | - Stephen A Holt
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation (ANSTO)
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8
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Yamaguchi A, Kashimura C, Aizawa M, Shibuya Y. Differential Scanning Calorimetry Study on the Adsorption of Myoglobin at Mesoporous Silicas: Effects of Solution pH and Pore Size. ACS OMEGA 2020; 5:22993-23001. [PMID: 32954149 PMCID: PMC7495722 DOI: 10.1021/acsomega.0c02602] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 08/19/2020] [Indexed: 06/11/2023]
Abstract
In the present study, pore adsorption behavior of globular myoglobin (Mb) at mesoporous silicas was examined utilizing the low-temperature differential scanning calorimetry (DSC) method. The DSC method relies on a decrease in heat of fusion for the pore water upon adsorption of Mb. The amount and structure of Mb adsorbed into the mesoporous silica were examined by DSC and optical absorption spectroscopy. The results indicated that the pore adsorption behavior of Mb strongly depended on the solution pH and pore size of mesoporous silica. For the adsorption of Mb (diameter = 3.5 nm) into mesoporous silica with narrow pores (pore diameter = 3.3 nm) at a pH ranging from 7.0 to 3.7, the penetration of both folded and denatured Mb molecules was confirmed. The folded Mb could penetrate into large mesoporous silica pores (pore diameter = 5.3 and 7.9 nm), whereas the penetration of the denatured Mb molecules was completely inhibited. The distribution of folded Mb at mesoporous silica depended on the pore size; almost all folded Mb molecules located inside mesoporous silica pores of diameters 3.3 and 5.3 nm, whereas the Mb molecules distributed at bot internal and external pore surfaces of mesoporous silica with 7.9 nm in pore diameter. These pore adsorption behaviors suggest that aggregation or stacking of the Mb molecules at the pore entrance regions of the large pores affected the pore adsorption behavior.
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Affiliation(s)
- Akira Yamaguchi
- Institute
of Quantum Beam Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
| | - Chiharu Kashimura
- Institute
of Quantum Beam Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
| | - Mami Aizawa
- Institute
of Quantum Beam Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
| | - Yuuta Shibuya
- New
Industry Creation Hatchery Center, Tohoku
University, Sendai 980-8577, Japan
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9
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Basnig D, Vilá N, Herzog G, Walcarius A. Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.113993] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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10
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Zheng D, Choi CH, Zhao X, Sun G. Facile fabrication of sponge-like porous micropillar arrays via an electrochemical process. NANOSCALE 2020; 12:10565-10572. [PMID: 32373863 DOI: 10.1039/d0nr01518k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A large variety of synthetic methods have been developed for hierarchically porous materials by which the performance of a wide range of applications can be dramatically enhanced. Herein, hierarchically porous micropillar arrays are demonstrated by employing electrochemical etching to silicon micropillars. The approach relies on the steering of current flow through the three-dimensional silicon-electrolyte interface to enable nanopores to grow on the entire surface of the micropillars, simultaneously. The pores grow perpendicular to the surface of the micropillars, whereas the pore diameter and porosity vary depending on the locations of the surfaces. The finite element analysis shows that the spatial variation of the pore diameter and porosity is determined by the distribution of current density. Further, the thickness of the porous layer can be tuned by etching time so that sponge-like porous structures are conveniently obtained by regulating the etching time. In addition to the effect of current density flowing through the etched surfaces, the growth of pores also depends on the crystal orientations of the etched surfaces. The etching results on square micropillar arrays and microgroove arrays show that the growth direction and rate of nanopores inside the microstructure also depend on the exposed crystal planes. The facile characteristics of the fabrication method can serve as an effective route for a wide range of applications of porous materials with enhanced capabilities.
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Affiliation(s)
- Deyin Zheng
- Institute of Robotics and Automatic Information System, Nankai University, Tianjin, 300071, People's Republic of China.
| | - Chang-Hwan Choi
- Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA
| | - Xin Zhao
- Institute of Robotics and Automatic Information System, Nankai University, Tianjin, 300071, People's Republic of China.
| | - Guangyi Sun
- Institute of Robotics and Automatic Information System, Nankai University, Tianjin, 300071, People's Republic of China.
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11
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Maheshwari H, Vilà N, Herzog G, Walcarius A. Selective Detection of Cysteine at a Mesoporous Silica Film Electrode Functionalized with Ferrocene in the Presence of Glutathione. ChemElectroChem 2020. [DOI: 10.1002/celc.202000396] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Himanshu Maheshwari
- Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement (LCPME) UMR 7564Université de Lorraine - CNRS 405 Rue de Vandoeuvre 54600 Villers-lès-Nancy France
| | - Neus Vilà
- Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement (LCPME) UMR 7564Université de Lorraine - CNRS 405 Rue de Vandoeuvre 54600 Villers-lès-Nancy France
| | - Grégoire Herzog
- Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement (LCPME) UMR 7564Université de Lorraine - CNRS 405 Rue de Vandoeuvre 54600 Villers-lès-Nancy France
| | - Alain Walcarius
- Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement (LCPME) UMR 7564Université de Lorraine - CNRS 405 Rue de Vandoeuvre 54600 Villers-lès-Nancy France
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12
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Mariani S, Paghi A, La Mattina AA, Debrassi A, Dähne L, Barillaro G. Decoration of Porous Silicon with Gold Nanoparticles via Layer-by-Layer Nanoassembly for Interferometric and Hybrid Photonic/Plasmonic (Bio)sensing. ACS APPLIED MATERIALS & INTERFACES 2019; 11:43731-43740. [PMID: 31644268 DOI: 10.1021/acsami.9b15737] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Gold nanoparticle layers (AuNPLs) enable the coupling of morphological, optical, and electrical properties of gold nanoparticles (AuNPs) with tailored and specific surface topography, making them exploitable in many bioapplications (e.g., biosensing, drug delivery, and photothermal therapy). Herein, we report the formation of AuNPLs on porous silicon (PSi) interferometers and distributed Bragg reflectors (DBRs) for (bio)sensing applications via layer-by-layer (LbL) nanoassembling of a positively charged polyelectrolyte, namely, poly(allylamine hydrochloride) (PAH), and negatively charged citrate-capped AuNPs. Decoration of PSi interferometers with AuNPLs enhances the Fabry-Pérot fringe contrast due to increased surface reflectivity, resulting in an augmented sensitivity for both bulk and surface refractive index sensing, namely, about 4.5-fold using NaCl aqueous solutions to infiltrate the pores and 2.6-fold for unspecific bovine serum albumin (BSA) adsorption on the pore surface, respectively. Sensitivity enhancing, about 2.5-fold, is also confirmed for affinity and selective biosensing of streptavidin using a biotinylated polymer, namely, negatively charged poly(methacrylic acid) (b-PMAA). Further, decoration of PSi DBR with AuNPLs envisages building up a hybrid photonic/plasmonic optical sensing platform. Both photonic (DBR stop-band) and plasmonic (localized surface plasmon resonance, LSPR) peaks of the hybrid structure are sensitive to changes of bulk (using glucose aqueous solutions) and surface (due to BSA unspecific adsorption) refractive index. To the best of our knowledge, this is the first report about the formation of AuNPLs via LbL nanoassembly on PSi for (i) the enhancing of the interferometric performance in (bio)sensing applications and (ii) the building up of hybrid photonic/plasmonic platforms for sensing and perspective biosensing applications.
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Affiliation(s)
- Stefano Mariani
- Dipartimento di Ingegneria dell'Informazione , Università di Pisa , Via G. Caruso 16 , 56122 Pisa , Italy
| | - Alessandro Paghi
- Dipartimento di Ingegneria dell'Informazione , Università di Pisa , Via G. Caruso 16 , 56122 Pisa , Italy
| | - Antonino A La Mattina
- Dipartimento di Ingegneria dell'Informazione , Università di Pisa , Via G. Caruso 16 , 56122 Pisa , Italy
| | - Aline Debrassi
- Surflay Nanotec GmbH , Max-Planck-Straße 3 , 12489 Berlin , Germany
| | - Lars Dähne
- Surflay Nanotec GmbH , Max-Planck-Straße 3 , 12489 Berlin , Germany
| | - Giuseppe Barillaro
- Dipartimento di Ingegneria dell'Informazione , Università di Pisa , Via G. Caruso 16 , 56122 Pisa , Italy
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13
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Yu N, Wu J. Rapid and reagentless detection of thrombin in clinic samples via microfluidic aptasensors with multiple target-binding sites. Biosens Bioelectron 2019; 146:111726. [PMID: 31586758 DOI: 10.1016/j.bios.2019.111726] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2019] [Revised: 09/18/2019] [Accepted: 09/20/2019] [Indexed: 01/11/2023]
Abstract
A reusable and straightforward aptasensor with the implementation of open-ended porous silicon (OEPSi) membranes was introduced for thrombin detection. When passing through the nanochannels of OEPSi integrated in a microfluidic cell, thrombin in sample solution could be captured by thrombin-binding aptamers (TBA) immobilized along the inner walls. The formation of thrombin-aptamer complex causes refractive index changes which can be measured by reflective interferometric Fourier transform spectroscopy (RIFTS). And this flow-through configuration with OEPSi has proven more efficient in capturing thrombin than the flow-over configuration with closed-ended PSi. For higher sensitivity, we investigated how the pore size, ionic strength, pH and aptamers affected the thrombin-aptamer interaction in nanopores. Under optimized conditions, the limits of detection (LOD) for thrombin detection in the buffer and serum were ∼6.70 nM and ∼8.21 nM respectively and a wide linear detection range (10-1000 nM) was observed. More importantly, this work reveals the sensitivity of the label-free biosensor can be significantly improved by attaching newly designed aptamers with two thrombin-binding sites. This phenomenon also indicates the potential of aptamer probes in adjusting effective pore size and enhancing the interaction between aptamers and targets through meticulous sequence design. Furthermore, the proposed strategy has been applied in thrombin detection in clinic samples successfully, which was verified by Enzyme-Linked Immunosorbent Assays (ELISA).
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Affiliation(s)
- Neng Yu
- Department of Chemistry, Zhejiang University, Hangzhou, 310058, China
| | - Jianmin Wu
- Department of Chemistry, Zhejiang University, Hangzhou, 310058, China.
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14
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Park Y, Yoo J, Kang MH, Kwon W, Joo J. Photoluminescent and biodegradable porous silicon nanoparticles for biomedical imaging. J Mater Chem B 2019; 7:6271-6292. [DOI: 10.1039/c9tb01042d] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A set of unique properties including biodegradability, intrinsic photoluminescence, and mesoporous structure allows porous silicon nanoparticles to address current challenges of translational nanomedicine, especially in biomedical imaging.
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Affiliation(s)
- Yoonsang Park
- Department of Chemical Engineering
- Pohang University of Science and Technology (POSTECH)
- Pohang 37673
- Republic of Korea
| | - Jounghyun Yoo
- Department of Chemical Engineering
- Pohang University of Science and Technology (POSTECH)
- Pohang 37673
- Republic of Korea
| | - Myoung-Hee Kang
- Department of Biomedical Engineering
- School of Life Sciences
- Ulsan National Institute of Science and Technology (UNIST)
- Ulsan 44919
- Republic of Korea
| | - Woosung Kwon
- Department of Chemical and Biological Engineering
- Sookmyung Women's University
- Seoul 04310
- Republic of Korea
| | - Jinmyoung Joo
- Department of Biomedical Engineering
- School of Life Sciences
- Ulsan National Institute of Science and Technology (UNIST)
- Ulsan 44919
- Republic of Korea
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15
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Mariani S, Robbiano V, Strambini LM, Debrassi A, Egri G, Dähne L, Barillaro G. Layer-by-layer biofunctionalization of nanostructured porous silicon for high-sensitivity and high-selectivity label-free affinity biosensing. Nat Commun 2018; 9:5256. [PMID: 30531860 PMCID: PMC6288083 DOI: 10.1038/s41467-018-07723-8] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 11/20/2018] [Indexed: 12/03/2022] Open
Abstract
Nanostructured materials premise to revolutionize the label-free biosensing of analytes for clinical applications, leveraging the deeper interaction between materials and analytes with comparable size. However, when the characteristic dimension of the materials reduces to the nanoscale, the surface functionalization for the binding of bioreceptors becomes a complex issue that can affect the performance of label-free biosensors. Here we report on an effective and robust route for surface biofunctionalization of nanostructured materials based on the layer-by-layer (LbL) electrostatic nano-assembly of oppositely-charged polyelectrolytes, which are engineered with bioreceptors to enable label-free detection of target analytes. LbL biofunctionalization is demonstrated using nanostructured porous silicon (PSi) interferometers for affinity detection of streptavidin in saliva, through LbL nano-assembly of a bi-layer of positively-charged poly(allylamine hydrochloride) (PAH) and negatively-charged biotinylated poly(methacrylic acid) (b-PMAA). High sensitivity in streptavidin detection is achieved, with high selectivity and stability, down to a detection limit of 600 fM.
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Affiliation(s)
- Stefano Mariani
- Dipartimento di Ingegneria dell'Informazione, Università di Pisa, Via G. Caruso 16, 56122, Pisa, Italy
| | - Valentina Robbiano
- Dipartimento di Ingegneria dell'Informazione, Università di Pisa, Via G. Caruso 16, 56122, Pisa, Italy
| | - Lucanos M Strambini
- Istituto di Elettronica e di Ingegneria dell'Informazione e delle Telecomunicazioni, Consiglio Nazionale delle Ricerche, Via G. Caruso 16, 56122, Pisa, Italy
| | - Aline Debrassi
- Surflay Nanotec GmbH, Max-Planck-Straße 3, 12489, Berlin, Germany
| | - Gabriela Egri
- Surflay Nanotec GmbH, Max-Planck-Straße 3, 12489, Berlin, Germany
| | - Lars Dähne
- Surflay Nanotec GmbH, Max-Planck-Straße 3, 12489, Berlin, Germany
| | - Giuseppe Barillaro
- Dipartimento di Ingegneria dell'Informazione, Università di Pisa, Via G. Caruso 16, 56122, Pisa, Italy.
- Istituto di Elettronica e di Ingegneria dell'Informazione e delle Telecomunicazioni, Consiglio Nazionale delle Ricerche, Via G. Caruso 16, 56122, Pisa, Italy.
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16
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Wang J, Kumeria T, Bezem MT, Wang J, Sailor MJ. Self-Reporting Photoluminescent Porous Silicon Microparticles for Drug Delivery. ACS APPLIED MATERIALS & INTERFACES 2018; 10:3200-3209. [PMID: 29278488 PMCID: PMC5951298 DOI: 10.1021/acsami.7b09071] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
A porous Si (pSi) microparticle-based delivery system is investigated, and the intrinsic luminescence from the particles is employed as a probe to monitor the release of a model protein payload, bovine serum albumin (BSA). The microparticles consist of a core Si skeleton surrounded by a SiO2 shell. Two types of pSi are tested, one with smaller (10 nm) pores and the other with larger (20 nm) pores. The larger pore material yields a higher mass loading of BSA (3 vs 20%). Two different methods are used to load BSA into these nanostructures: the first involves loading by electrostatic physisorption, and the second involves trapping of BSA in the pSi matrix by local precipitation of magnesium silicate. Protein release from the former system is characterized by a burst release, whereas in the latter system, release is controlled by dissolution of the pSi/magnesium silicate matrix. The protein release characteristics are studied under accelerated (0.1 M aqueous KOH, 21 °C) and physiologically relevant (phosphate-buffered saline, pH 7.4, 37 °C) conditions, and the near-infrared photoluminescence signal from the pSi skeleton is monitored as a function of time and correlated with protein release and silicon dissolution. The thickness of the Si core and the SiO2 shell are systematically varied, and it is found that the luminescence signature can be tuned to provide a signal that either scales with protein elution or that changes rapidly near the end of useful life of the delivery system. Although payload release and particle dissolution are not driven by the same mechanism, the correlations between luminescence and payload elution for the various formulations can be used to define design rules for this self-reporting delivery system.
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Affiliation(s)
- Joanna Wang
- Material Science and Engineering Program, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Tushar Kumeria
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
- School of Pharmacy, The University of Queensland, 20 Cornwall Street, Woolloongabba, Queensland 4102, Australia
| | - Maria Teresa Bezem
- Department of Biomedicine, University of Bergen, Jonas Lies vei 91, N-5020 Bergen, Norway
| | - Jian Wang
- School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China
| | - Michael J. Sailor
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
- Corresponding Author:
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17
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Kim T, Fu X, Warther D, Sailor MJ. Size-Controlled Pd Nanoparticle Catalysts Prepared by Galvanic Displacement into a Porous Si-Iron Oxide Nanoparticle Host. ACS NANO 2017; 11:2773-2784. [PMID: 28195692 DOI: 10.1021/acsnano.6b07820] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Porous silicon nanoparticles containing both Pd and iron oxide nanoparticles are prepared and studied as magnetically recoverable catalysts for organic reductions. The Pd nanoparticles are generated in situ by electroless deposition of Pd(NH3)42+, where the porous Si skeleton acts as both a template and as a reducing agent and the released ammonia ligands raise the local pH to exert control over the size of the Pd nanoparticles. The nanocomposites are characterized by transmission electron microscopy, energy-dispersive X-ray spectroscopy, nitrogen adsorption, X-ray diffraction, superconducting quantum interference device magnetization, and dynamic light scattering. The nanocomposite consists of a porous Si nanoparticle (150 nm mean diameter) containing ∼20 nm pores, uniformly decorated with a high loading of surfactant-free Pd nanoparticles (12 nm mean diameter) and superparamagnetic γ-Fe2O3 nanoparticles (∼7 nm mean diameter). The reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride is catalyzed by the nanocomposite, which is stable through the course of the reaction. Catalytic reduction of the organic dyes methylene blue and rhodamine B is also demonstrated. The conversion efficiency and catalytic activity are found to be superior to a commercial Pd/C catalyst compared under comparable reaction conditions. The composite catalyst can be recovered from the reaction mixture by applying an external magnetic field due to the existence of the superparamagnetic iron oxide nanoparticles in the construct. The recovered particles retain their catalytic activity.
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Affiliation(s)
- Taeho Kim
- Department of Chemistry and Biochemistry and ‡Department of Nanoengineering, University of California, San Diego , La Jolla, California 92093, United States
| | - Xin Fu
- Department of Chemistry and Biochemistry and ‡Department of Nanoengineering, University of California, San Diego , La Jolla, California 92093, United States
| | - David Warther
- Department of Chemistry and Biochemistry and ‡Department of Nanoengineering, University of California, San Diego , La Jolla, California 92093, United States
| | - Michael J Sailor
- Department of Chemistry and Biochemistry and ‡Department of Nanoengineering, University of California, San Diego , La Jolla, California 92093, United States
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18
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ARAFUNE H, HOTTA K, ITOH T, TERAMAE N, YAMAGUCHI A. Nanoporous Waveguide Spectroscopy for the Estimation of Enzyme Adsorption on Mesoporous Silica. ANAL SCI 2017; 33:473-476. [DOI: 10.2116/analsci.33.473] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Hiroyuki ARAFUNE
- Department of Creative Engineering, National Institute of Technology, Tsuruoka College
| | - Kazuhiro HOTTA
- Department of Chemistry, Graduate School of Science, Tohoku University
| | - Tetsuji ITOH
- Research Center for Compact Chemical System, National Institute of Advanced Industrial Science and Technology (AIST)
| | - Norio TERAMAE
- Department of Chemistry, Graduate School of Science, Tohoku University
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19
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Mariani S, Pino L, Strambini LM, Tedeschi L, Barillaro G. 10 000-Fold Improvement in Protein Detection Using Nanostructured Porous Silicon Interferometric Aptasensors. ACS Sens 2016. [DOI: 10.1021/acssensors.6b00634] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Stefano Mariani
- Dipartimento
di Ingegneria dell’Informazione, Università di Pisa, via G. Caruso 16, 56122 Pisa, Italy
| | - Laura Pino
- Istituto
di Fisiologia Clinica, Consiglio Nazionale delle Ricerche, via G.
Moruzzi 1, 56124 Pisa, Italy
| | - Lucanos M. Strambini
- Dipartimento
di Ingegneria dell’Informazione, Università di Pisa, via G. Caruso 16, 56122 Pisa, Italy
| | - Lorena Tedeschi
- Dipartimento
di Ingegneria dell’Informazione, Università di Pisa, via G. Caruso 16, 56122 Pisa, Italy
| | - Giuseppe Barillaro
- Dipartimento
di Ingegneria dell’Informazione, Università di Pisa, via G. Caruso 16, 56122 Pisa, Italy
- Istituto
di Fisiologia Clinica, Consiglio Nazionale delle Ricerche, via G.
Moruzzi 1, 56124 Pisa, Italy
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20
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Mariani S, Strambini LM, Barillaro G. Femtomole Detection of Proteins Using a Label-Free Nanostructured Porous Silicon Interferometer for Perspective Ultrasensitive Biosensing. Anal Chem 2016; 88:8502-9. [PMID: 27479768 DOI: 10.1021/acs.analchem.6b01228] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Nanostructured porous silicon (PS) is a promising material for label-free optical detection of biomolecules, though it currently suffers of limited clinical diagnostic applications due to insufficient sensitivity. In this regard, here we introduce an ultrasensitive and robust signal processing strategy for PS biosensors that relies on the calculation of the average value over wavelength of spectral interferograms, namely IAW, obtained on PS interferometer by subtraction (wavelength by wavelength) of reflection spectra acquired after adsorption of biomolecules inside the nanopores from a reference reflection spectrum recorded in acetate buffer. As a case study, we choose to monitor bovine serum albumin (BSA) unspecific adsorption, which has been often employed in the literature as a model for proof-of-concept studies of perspective biosensing applications. The proposed IAW signal processing strategy enables reliable detection of BSA at concentrations in the range from 150 pM to 15 μM (down to 3 orders of magnitude lower than those targeted in the current literature) using a PS interferometer operating in label-free mode without any amplification strategies, with good sample-to-sample reproducibility over the whole range of tested concentrations (%CV = 16% over 5 replicates) and good signal-to-noise ratio also at the lowest tested concentration (S/N ≈ 4.6 at 150 pM). A detection limit (DL) of 20 pM (20 femtomoles, 1 mL) is estimated from the sigmoidal function best fitting (R(2) = 0.989) IAW experimental data over the whole range of tested concentrations. This is the lowest DL that has been reported in the literature since the seminal paper of Sailor and co-workers (1997) on the use of PS interferometer for biosensing, and lowers of 4 orders of magnitude DL attained with label-free PS interferometers using conventional effective optical thickness (EOT) calculation through reflective interferometric Fourier transform spectroscopy. Accordingly, the IAW signal processing strategy envisage bringing PS optical transduction at the forefront of ultrasensitive label-free biosensing techniques, especially for point-of-care clinical analysis where low analyte concentrations have to be detected in a small amount of biological samples.
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Affiliation(s)
- Stefano Mariani
- Dipartimento di Ingegneria dell'Informazione, Università di Pisa , via G. Caruso 16, 56122 Pisa, Italy
| | | | - Giuseppe Barillaro
- Dipartimento di Ingegneria dell'Informazione, Università di Pisa , via G. Caruso 16, 56122 Pisa, Italy
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21
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Wu CC, Hu Y, Miller M, Aroian RV, Sailor MJ. Protection and Delivery of Anthelmintic Protein Cry5B to Nematodes Using Mesoporous Silicon Particles. ACS NANO 2015; 9:6158-67. [PMID: 25950754 PMCID: PMC5704939 DOI: 10.1021/acsnano.5b01426] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The ability of nano- and microparticles of partially oxidized mesoporous silicon (pSi) to sequester, protect, and deliver the anthelmintic pore-forming protein Cry5B to nematodes is assessed in vitro and in vivo. Thermally oxidized pSi particles are stable under gastric conditions and show relatively low toxicity to nematodes. Fluorescence images of rhodamine-labeled pSi particles within the nematodes Caenorhabditis elegans and Ancylostoma ceylanicum show that ingestion is dependent on particle size: particles of a 0.4 ± 0.2 μm size are noticeably ingested by both species within 2 h of introduction in vitro, whereas 5 ± 2 μm particles are excluded from C. elegans but enter the pharynx region of A. ceylanicum after 24 h. The anthelmintic protein Cry5B, a pore-forming crystal (Cry) protein derived from Bacillus thuringiensis, is incorporated into the pSi particles by aqueous infiltration. Feeding of Cry5B-loaded pSi particles to C. elegans leads to significant intoxication of the nematode. Protein-loaded particles of size 0.4 μm display the highest level of in vitro toxicity toward C. elegans on a drug-mass basis. The porous nanostructure protects Cry5B from hydrolytic and enzymatic (pepsin) degradation in simulated gastric fluid (pH 1.2) for time periods up to 2 h. In vivo experiments with hookworm-infected hamsters show no significant reduction in worm burden with the Cry5B-loaded particles, which is attributed to slow release of the protein from the particles and/or short residence time of the particles in the duodenum of the animal.
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Affiliation(s)
- Chia-Chen Wu
- Materials Science and Engineering, University of California, San Diego, La Jolla, California 92093, United States
| | - Yan Hu
- Section of Cell and Development Biology, University of California, San Diego, La Jolla, California 92093, United States
| | - Melanie Miller
- Section of Cell and Development Biology, University of California, San Diego, La Jolla, California 92093, United States
| | - Raffi V. Aroian
- Section of Cell and Development Biology, University of California, San Diego, La Jolla, California 92093, United States
| | - Michael J. Sailor
- Materials Science and Engineering, University of California, San Diego, La Jolla, California 92093, United States
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
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22
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Macias G, Ferré-Borrull J, Pallarès J, Marsal LF. Effect of pore diameter in nanoporous anodic alumina optical biosensors. Analyst 2015; 140:4848-54. [DOI: 10.1039/c4an01408a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This study demonstrates how it is possible to tune the sensitivity of nanoporous anodic alumina optical biosensors by adjusting pore diameter.
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Affiliation(s)
- G. Macias
- Department of Electronic
- Electric and Automatics Engineering
- Universitat Rovira i Virgili
- 43007 Tarragona
- Spain
| | - J. Ferré-Borrull
- Department of Electronic
- Electric and Automatics Engineering
- Universitat Rovira i Virgili
- 43007 Tarragona
- Spain
| | - J. Pallarès
- Department of Electronic
- Electric and Automatics Engineering
- Universitat Rovira i Virgili
- 43007 Tarragona
- Spain
| | - L. F. Marsal
- Department of Electronic
- Electric and Automatics Engineering
- Universitat Rovira i Virgili
- 43007 Tarragona
- Spain
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23
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Zhang T, Zhou Y. Preparation of Hierarchically Structured Layered Double Hydroxide Microspheres and Their Application in BSA Separation. J DISPER SCI TECHNOL 2014. [DOI: 10.1080/01932691.2014.945593] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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24
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Synthesis and characterization of a stable, label-free optical biosensor from TiO2-coated porous silicon. Biosens Bioelectron 2014; 55:372-8. [DOI: 10.1016/j.bios.2013.12.016] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Revised: 11/17/2013] [Accepted: 12/04/2013] [Indexed: 11/19/2022]
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25
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Identification of parameter interactions influencing the precipitation of a monoclonal antibody with anionic polyelectrolytes. Sep Purif Technol 2014. [DOI: 10.1016/j.seppur.2014.02.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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26
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Sundaram HS, Ella-Menye JR, Brault ND, Shao Q, Jiang S. Reversibly switchable polymer with cationic/zwitterionic/anionic behavior through synergistic protonation and deprotonation. Chem Sci 2014. [DOI: 10.1039/c3sc52233d] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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27
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Wu CC, Chen MY, Sailor MJ. Differential adsorption of small molecules in spatially functionalized porous silicon nanostructures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:11802-11808. [PMID: 23965031 DOI: 10.1021/la402261v] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
An experimental approach to rapidly quantify the relative affinity of a small molecule analyte for two different surfaces is described. The method uses optical measurements of high surface area porous Si thin films that contain two spatially distinct surface chemistries. The chemistries are placed on the walls of the ∼10 nm diameter pores of the porous Si film by means of microdroplet patterning, where a chemical resist is drop-coated on the porous Si sample to define distinct regions across the plane of the chip. In this work, the two chemistries consist of a hydrophilic silicon oxide surface and a hydrophobic methyl-terminated silicon surface. Detection is achieved by simultaneous optical reflectance measurements of both regions, where the reflectance spectrum contains a convolution of the Fabry-Pérot interference spectrum of both the oxide and the methyl-grafted layers. The differential partitioning of a test analyte (2-acetoxybenzoic acid or diphenyl ether) from aqueous solution is determined from the Fourier transform of the optical interference spectrum. The approach is rapid and nondestructive, and it can be performed on a small sample volume as a means to quantify the partition behavior of small molecules.
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Affiliation(s)
- Chia-Chen Wu
- Materials Science and Engineering, ‡Department of Bioengineering, §Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093, United States
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28
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Santos A, Kumeria T, Losic D. Optically Optimized Photoluminescent and Interferometric Biosensors Based on Nanoporous Anodic Alumina: A Comparison. Anal Chem 2013; 85:7904-11. [DOI: 10.1021/ac401609c] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Abel Santos
- School of Chemical Engineering, The
University of Adelaide,
Adelaide, SA 5005 Australia
| | - Tushar Kumeria
- School of Chemical Engineering, The
University of Adelaide,
Adelaide, SA 5005 Australia
| | - Dusan Losic
- School of Chemical Engineering, The
University of Adelaide,
Adelaide, SA 5005 Australia
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29
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Imbraguglio D, Giovannozzi AM, Nastro A, Rossi AM. Submicron machining and biomolecule immobilization on porous silicon by electron beam. NANOSCALE RESEARCH LETTERS 2012; 7:530. [PMID: 23009218 PMCID: PMC3477033 DOI: 10.1186/1556-276x-7-530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Accepted: 09/13/2012] [Indexed: 06/01/2023]
Abstract
Three-dimensional submicrometric structures and biomolecular patterns have been fabricated on a porous silicon film by an electron beam-based functionalization method. The immobilized proteins act as a passivation layer against material corrosion in aqueous solutions. The effects' dependence on the main parameters of the process (i.e., the electron beam dose, the biomolecule concentration, and the incubation time) has been demonstrated.
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Affiliation(s)
- Dario Imbraguglio
- Thermodynamics Division, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, Torino, 10135, Italy
| | - Andrea Mario Giovannozzi
- Thermodynamics Division, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, Torino, 10135, Italy
| | - Annalisa Nastro
- Thermodynamics Division, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, Torino, 10135, Italy
| | - Andrea Mario Rossi
- Thermodynamics Division, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, Torino, 10135, Italy
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30
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Liu B, Zeng F, Liu Y, Wu S. A FRET system built on quartz plate as a ratiometric fluorescence sensor for mercury ions in water. Analyst 2012; 137:1698-705. [DOI: 10.1039/c2an16231h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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