1
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Viger ML, Collet G, Lux J, Nguyen Huu VA, Guma M, Foucault-Collet A, Olejniczak J, Joshi-Barr S, Firestein GS, Almutairi A. Distinct ON/OFF fluorescence signals from dual-responsive activatable nanoprobes allows detection of inflammation with improved contrast. Biomaterials 2017; 133:119-131. [PMID: 28433935 DOI: 10.1016/j.biomaterials.2017.03.042] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 03/21/2017] [Accepted: 03/25/2017] [Indexed: 01/08/2023]
Abstract
Visualization of biochemical changes associated with disease is of great clinical significance, as it should allow earlier, more accurate diagnosis than structural imaging, facilitating timely clinical intervention. Herein, we report combining stimuli-responsive polymers and near-infrared fluorescent dyes (emission max: 790 nm) to create robust activatable fluorescent nanoprobes capable of simultaneously detecting acidosis and oxidative stress associated with inflammatory microenvironments. The spectrally-resolved mechanism of fluorescence activation allows removal of unwanted background signal (up to 20-fold reduction) and isolation of a pure activated signal, which enables sensitive and unambiguous localization of inflamed areas; target-to-background ratios reach 22 as early as 3 h post-injection. This new detection platform could have significant clinical impact in early detection of pathologies, individual tailoring of drug therapy, and image-guided tumor resection.
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Affiliation(s)
- Mathieu L Viger
- Skaggs School of Pharmacy and Pharmaceutical Sciences, KACST - UCSD Center for Excellence in Nanomedicine and Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0600, USA
| | - Guillaume Collet
- Skaggs School of Pharmacy and Pharmaceutical Sciences, KACST - UCSD Center for Excellence in Nanomedicine and Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0600, USA
| | - Jacques Lux
- UT Southwestern Medical Center, Department of Radiology, 5323 Harry Hines Blvd., Dallas, TX 75390-8896, USA
| | - Viet Anh Nguyen Huu
- Department of Nanoengineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0448, USA
| | - Monica Guma
- Division of Rheumatology, Allergy and Immunology, School of Medicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0656, USA
| | - Alexandra Foucault-Collet
- Skaggs School of Pharmacy and Pharmaceutical Sciences, KACST - UCSD Center for Excellence in Nanomedicine and Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0600, USA
| | - Jason Olejniczak
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0332, USA
| | - Shivanjali Joshi-Barr
- Skaggs School of Pharmacy and Pharmaceutical Sciences, KACST - UCSD Center for Excellence in Nanomedicine and Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0600, USA
| | - Gary S Firestein
- Division of Rheumatology, Allergy and Immunology, School of Medicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0656, USA
| | - Adah Almutairi
- Skaggs School of Pharmacy and Pharmaceutical Sciences, KACST - UCSD Center for Excellence in Nanomedicine and Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0600, USA.
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2
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Carling CJ, Olejniczak J, Foucault-Collet A, Collet G, Viger ML, Nguyen Huu VA, Duggan BM, Almutairi A. Efficient Red Light Photo-Uncaging of Active Molecules in Water Upon Assembly into Nanoparticles. Chem Sci 2016; 7:2392-2398. [PMID: 27014436 PMCID: PMC4800316 DOI: 10.1039/c5sc03717d] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 12/08/2015] [Indexed: 12/16/2022] Open
Abstract
We introduce a means of efficiently photo-uncaging active compounds from amino-1,4-benzoquinone in aqueous environments. Aqueous photochemistry of this photocage with one-photon red light is typically not efficient unless the photocaged molecules are allowed to assemble into nanoparticles. A variety of biologically active molecules were functionalized with the photocage and subsequently formulated into water-dispersible nanoparticles. Red light irradiation through various mammalian tissues achieved efficient photo-uncaging. Co-encapsulation of NIR fluorescent dyes and subsequent photomodulation provides a NIR fluorescent tool to assess both particle location and successful photorelease.
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Affiliation(s)
- Carl-Johan Carling
- Skaggs School of Pharmacy and Pharmaceutical Sciences
, University of California, San Diego
,
9500 Gilman Dr.
, La Jolla
, California 92093
, USA
.
| | - Jason Olejniczak
- Department of Chemistry and Biochemistry
, University of California, San Diego
,
9500 Gilman Dr.
, La Jolla
, California 92093
, USA
| | - Alexandra Foucault-Collet
- Skaggs School of Pharmacy and Pharmaceutical Sciences
, University of California, San Diego
,
9500 Gilman Dr.
, La Jolla
, California 92093
, USA
.
| | - Guillaume Collet
- Skaggs School of Pharmacy and Pharmaceutical Sciences
, University of California, San Diego
,
9500 Gilman Dr.
, La Jolla
, California 92093
, USA
.
| | - Mathieu L. Viger
- Skaggs School of Pharmacy and Pharmaceutical Sciences
, University of California, San Diego
,
9500 Gilman Dr.
, La Jolla
, California 92093
, USA
.
| | - Viet Anh Nguyen Huu
- Department of Nanoengineering
, University of California, San Diego
,
9500 Gilman Dr.
, La Jolla
, California 92093
, USA
| | - Brendan M. Duggan
- Skaggs School of Pharmacy and Pharmaceutical Sciences
, University of California, San Diego
,
9500 Gilman Dr.
, La Jolla
, California 92093
, USA
.
| | - Adah Almutairi
- Skaggs School of Pharmacy and Pharmaceutical Sciences
, University of California, San Diego
,
9500 Gilman Dr.
, La Jolla
, California 92093
, USA
.
- Department of Nanoengineering
, University of California, San Diego
,
9500 Gilman Dr.
, La Jolla
, California 92093
, USA
- Department of Materials Science and Engineering
, University of California, San Diego
,
9500 Gilman Dr.
, La Jolla
, California 92093
, USA
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3
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Carling CJ, Viger ML, Nguyen Huu VA, Garcia AV, Almutairi A. In Vivo Visible Light-Triggered Drug Release From an Implanted Depot. Chem Sci 2015; 6:335-341. [PMID: 25598962 PMCID: PMC4295782 DOI: 10.1039/c4sc02651a] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 10/04/2014] [Indexed: 01/03/2023] Open
Abstract
Controlling chemistry in space and time has offered scientists and engineers powerful tools for research and technology. For example, on-demand photo-triggered activation of neurotransmitters has revolutionized neuroscience. Non-invasive control of the availability of bioactive molecules in living organisms will undoubtedly lead to major advances; however, this requires the development of photosystems that efficiently respond to regions of the electromagnetic spectrum that innocuously penetrate tissue. To this end, we have developed a polymer that photochemically degrades upon absorption of one photon of visible light and demonstrated its potential for medical applications. Particles formulated from this polymer release molecular cargo in vitro and in vivo upon irradiation with blue visible light through a photoexpansile swelling mechanism.
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Affiliation(s)
- Carl-Johan Carling
- Skaggs School of Pharmacy and Pharmaceutical Sciences , University of California, San Diego , 9500 Gilman Dr. , La Jolla , California 92093 , USA . ; Tel: +1-858-246-0871
- KACST-UCSD Center for Excellence in Nanomedicine , University of California, San Diego , 9500 Gilman Dr. , La Jolla , California 92093 , USA
| | - Mathieu L. Viger
- Skaggs School of Pharmacy and Pharmaceutical Sciences , University of California, San Diego , 9500 Gilman Dr. , La Jolla , California 92093 , USA . ; Tel: +1-858-246-0871
- KACST-UCSD Center for Excellence in Nanomedicine , University of California, San Diego , 9500 Gilman Dr. , La Jolla , California 92093 , USA
| | - Viet Anh Nguyen Huu
- KACST-UCSD Center for Excellence in Nanomedicine , University of California, San Diego , 9500 Gilman Dr. , La Jolla , California 92093 , USA
- Department of NanoEngineering , University of California, San Diego , 9500 Gilman Dr. , La Jolla , California 92093 , USA
| | - Arnold V. Garcia
- Skaggs School of Pharmacy and Pharmaceutical Sciences , University of California, San Diego , 9500 Gilman Dr. , La Jolla , California 92093 , USA . ; Tel: +1-858-246-0871
- KACST-UCSD Center for Excellence in Nanomedicine , University of California, San Diego , 9500 Gilman Dr. , La Jolla , California 92093 , USA
| | - Adah Almutairi
- Skaggs School of Pharmacy and Pharmaceutical Sciences , University of California, San Diego , 9500 Gilman Dr. , La Jolla , California 92093 , USA . ; Tel: +1-858-246-0871
- KACST-UCSD Center for Excellence in Nanomedicine , University of California, San Diego , 9500 Gilman Dr. , La Jolla , California 92093 , USA
- Department of NanoEngineering , University of California, San Diego , 9500 Gilman Dr. , La Jolla , California 92093 , USA
- Department of Materials Science and Engineering , University of California, San Diego , 9500 Gilman Dr. , La Jolla , California 92093 , USA
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4
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Viger ML, Sheng W, Doré K, Alhasan AH, Carling CJ, Lux J, de Gracia Lux C, Grossman M, Malinow R, Almutairi A. Near-infrared-induced heating of confined water in polymeric particles for efficient payload release. ACS Nano 2014; 8:4815-26. [PMID: 24717072 PMCID: PMC4046803 DOI: 10.1021/nn500702g] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 03/31/2014] [Indexed: 05/14/2023]
Abstract
Near-infrared (NIR) light-triggered release from polymeric capsules could make a major impact on biological research by enabling remote and spatiotemporal control over the release of encapsulated cargo. The few existing mechanisms for NIR-triggered release have not been widely applied because they require custom synthesis of designer polymers, high-powered lasers to drive inefficient two-photon processes, and/or coencapsulation of bulky inorganic particles. In search of a simpler mechanism, we found that exposure to laser light resonant with the vibrational absorption of water (980 nm) in the NIR region can induce release of payloads encapsulated in particles made from inherently non-photo-responsive polymers. We hypothesize that confined water pockets present in hydrated polymer particles absorb electromagnetic energy and transfer it to the polymer matrix, inducing a thermal phase change. In this study, we show that this simple and highly universal strategy enables instantaneous and controlled release of payloads in aqueous environments as well as in living cells using both pulsed and continuous wavelength lasers without significant heating of the surrounding aqueous solution.
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Affiliation(s)
- Mathieu L. Viger
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Wangzhong Sheng
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Kim Doré
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Ali H. Alhasan
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Carl-Johan Carling
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Jacques Lux
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Caroline de Gracia Lux
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Madeleine Grossman
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Roberto Malinow
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Adah Almutairi
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
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5
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Olejniczak J, Sankaranarayanan J, Viger ML, Almutairi A. Highest Efficiency Two-Photon Degradable Copolymer for Remote Controlled Release. ACS Macro Lett 2013; 2:683-687. [PMID: 24044102 PMCID: PMC3772660 DOI: 10.1021/mz400256x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
To address the scarcity of polymers that degrade upon absorption of near infrared (NIR) light, we introduce a new polymer containing moieties in its backbone capable of highly efficient NIR-triggered photocleavage. The polymer rapidly undergoes backbone scission in response to both UV-Vis and near infrared light via two-photon absorption, as revealed by gel permeation chromatography. Cleavage of photosensitive groups from the backbone is confirmed by 1H NMR. These polymers were successfully formulated into particles encapsulating a dye that was released upon irradiation with UV-Vis and NIR light, as indicated by changes in fluorescence characteristic of increased solvent interaction with cargo. Thus, this new polymer is readily photocleaved by UV-Vis and NIR light, giving it a variety of potential applications in photopatterning and on-demand release.
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Affiliation(s)
- Jason Olejniczak
- Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093
| | - Jagadis Sankaranarayanan
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, California 92093
| | - Mathieu L. Viger
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, California 92093
| | - Adah Almutairi
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, California 92093
- Departments of NanoEngineering and of Materials Science and Engineering, University of California at San Diego, La Jolla, California 92093
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6
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Viger ML, Grossman M, Fomina N, Almutairi A. Low power upconverted near-IR light for efficient polymeric nanoparticle degradation and cargo release. Adv Mater 2013; 25:3733-8. [PMID: 23722298 PMCID: PMC3980738 DOI: 10.1002/adma.201300902] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Indexed: 05/22/2023]
Abstract
By encapsulating NaYF4 :Tm.Yb upconverting nanocrystals in UV-degradable polymer capsules, it is possible to access efficient polymer photodegradation and remotely controlled release using near-IR laser light at an unprecedentedly low power.
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Affiliation(s)
- Mathieu L. Viger
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Departments of NanoEngineering and of Materials Science and Engineering, University of California at San Diego, La Jolla, CA, 92093, USA
| | - Madeleine Grossman
- Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, CA, 92093, USA
| | - Nadezda Fomina
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Departments of NanoEngineering and of Materials Science and Engineering, University of California at San Diego, La Jolla, CA, 92093, USA
| | - Adah Almutairi
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Departments of NanoEngineering and of Materials Science and Engineering, University of California at San Diego, La Jolla, CA, 92093, USA
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7
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Viger ML, Sheng W, McFearin CL, Berezin MY, Almutairi A. Application of time-resolved fluorescence for direct and continuous probing of release from polymeric delivery vehicles. J Control Release 2013; 171:308-14. [PMID: 23792808 DOI: 10.1016/j.jconrel.2013.06.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Revised: 06/03/2013] [Accepted: 06/10/2013] [Indexed: 12/30/2022]
Abstract
Though accurately evaluating the kinetics of release is critical for validating newly designed therapeutic carriers for in vivo applications, few methods yet exist for release measurement in real time and without the need for any sample preparation. Many of the current approaches (e.g. chromatographic methods, absorption spectroscopy, or NMR spectroscopy) rely on isolation of the released material from the loaded vehicles, which require additional sample purification and can lead to loss of accuracy when probing fast kinetics of release. In this study we describe the use of time-resolved fluorescence for in situ monitoring of small molecule release kinetics from biodegradable polymeric drug delivery systems. This method relies on the observation that fluorescent reporters being released from polymeric drug delivery systems possess distinct excited-state lifetime components, reflecting their different environments in the particle suspensions, i.e., confined in the polymer matrices or free in the aqueous environment. These distinct lifetimes enable real-time quantitative mapping of the relative concentrations of dye in each population to obtain precise and accurate temporal information on the release profile of particular carrier/payload combinations. We found that fluorescence lifetime better distinguishes subtle differences in release profiles (e.g. differences associated with dye loading) than conventional steady-state fluorescence measurements, which represent the averaged dye behavior over the entire scan. Given the method's applicability to both hydrophobic and hydrophilic cargo, it could be employed to model the release of any drug-carrier combination.
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Affiliation(s)
- Mathieu L Viger
- School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, 92093, USA
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8
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de Gracia Lux C, Olejniczak J, Fomina N, Viger ML, Almutairi A. Intramolecular cyclization assistance for fast degradation of ornithine-based poly(ester amide)s. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/pola.26788] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Caroline de Gracia Lux
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego; La Jolla California 92093
| | - Jason Olejniczak
- Department of Chemistry and Biochemistry, University of California at San Diego; La Jolla California 92093
| | - Nadezda Fomina
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego; La Jolla California 92093
| | - Mathieu L. Viger
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego; La Jolla California 92093
| | - Adah Almutairi
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego; La Jolla California 92093
- Department of NanoEngineering, University of California at San Diego; La Jolla California 92093
- Department of Materials Science and Engineering, University of California at San Diego; La Jolla California 92093
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9
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Viger ML, Sankaranarayanan J, de Gracia Lux C, Chan M, Almutairi A. Collective activation of MRI agents via encapsulation and disease-triggered release. J Am Chem Soc 2013; 135:7847-50. [PMID: 23672342 DOI: 10.1021/ja403167p] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
An activation mechanism based on encapsulated ultrasmall gadolinium oxide nanoparticles (Gd oxide NPs) in bioresponsive polymer capsules capable of triggered release in response to chemical markers of disease (i.e., acidic pH, H2O2) is presented. Inside the hydrophobic polymeric matrices, the Gd oxide NPs are shielded from the aqueous environment, silencing their ability to enhance water proton relaxation. Upon disassembly of the polymeric particles, activation of multiple contrast agents generates a strong positive contrast enhancement of >1 order of magnitude.
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Affiliation(s)
- Mathieu L Viger
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, California, 92093, USA
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10
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Brouard D, Viger ML, Bracamonte AG, Boudreau D. Label-free biosensing based on multilayer fluorescent nanocomposites and a cationic polymeric transducer. ACS Nano 2011; 5:1888-96. [PMID: 21344882 DOI: 10.1021/nn102776m] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
This study describes the preparation and characterization of a DNA sensing architecture combining the molecular recognition capabilities of a cationic conjugated polymer transducer with highly fluorescent core-shell nanoparticles (NPs). The very structure of the probe-labeled NPs and the polymer-induced formation of NP aggregates maximize the proximity between the polymer donor and acceptor NPs that is required for optimal resonant energy transfer. Each hybridization event is signaled by a potentially large number of excited reporters following the efficient plasmon-enhanced energy transfer between target-activated polymer transducer and fluorophores located in the self-assembled core-shell aggregates, resulting in direct molecular detection of target nucleic acids at femtomolar concentrations.
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Affiliation(s)
- Danny Brouard
- Département de chimie and Centre d'optique, photonique et laser (COPL), Université Laval, Québec (QC), Canada G1V 0A6
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11
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Viger ML, Gravel JFY, Brouard D, Beauchemin D, Boudreau D. Use of Sol−Gels as Solid Matrixes for Trace Analysis by UV Laser Ablation and Laser-Enhanced Ionization Detection. Anal Chem 2004; 77:706-10. [PMID: 15649076 DOI: 10.1021/ac048884i] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Zirconium and silicon sol-gels were investigated as solid materials for trace elemental analysis of pelletized solid samples by laser ablation and laser-enhanced ionization. The highly homogeneous dispersion of an internal standard spiked in the solid material obtained with the sol-gel formation process leads to a significant improvement in signal repeatability and to an increase in the precision of measurements through better correction of variations in the laser ablation rate. Signal repeatability values of 5-8% RSD were obtained for Pb in NIST 1632c Bituminous Coal sample pellets prepared using both sol-gels, as compared to 9-21% for graphite-based sample pellets. Furthermore, the zirconium sol-gel was shown to offer better resilience to signal bias due to preferential ablation and a more accurate correction of ablation rate using the internal standardization method.
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Affiliation(s)
- Mathieu L Viger
- Department of Chemistry and Centre d'optique, Photonique et Laser (COPL), Université Laval, Quebec City, PQ, Canada G1K 7P4
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12
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Gravel JFY, Viger ML, Nobert P, Boudreau D. Multielemental laser-enhanced ionization spectrometry for the determination of lead at the trace level in pelletized coal using laser ablation and internal standard signal normalization. Appl Spectrosc 2004; 58:727-733. [PMID: 18171515 DOI: 10.1366/000370204873088] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Laser ablation laser-enhanced ionization (LA-LEI) was used for the simultaneous measurement of lead and indium in pelletized graphite and coal samples. UV Laser ablation of the solid samples was performed in an ablation cell and the ablated material was carried by a flow of gas to a miniature LEI flame where lead was detected. The influence of parameters such as binder content of the solid pellets and dispersion of the analytes spiked in the sample material, as well as the number of ablation pulses per crater on signal repeatability and on the size and shape of ejected particles was examined. Measurement repeatability values of 2 to 5% of relative standard deviation were obtained using indium as an internal standard to correct for variations in the ablation rate. A limit of detection of 120 nanograms per gram was calculated for the determination of Pb in high-purity graphite. The Pb concentration in the NIST 1632c Bituminous Coal certified reference material was determined to within 1% of its certified value, using graphite as the matrix-matching material and In as the internal standard in pelletized solid samples.
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Affiliation(s)
- Jean-François Y Gravel
- Center for Optics, Photonics and Lasers (COPL) and Department of Chemistry, Université Laval, Quebec City (PQ), Canada G1K 7P4
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