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Khatun B, Rohilla S, Rather MA, Sinha A, Dasgupta S, Mandal M, Maji TK. Improved bioactivities of curcumin pyrazole and its HP$$\beta$$CD inclusion complex compared to curcumin. J CHEM SCI 2023. [DOI: 10.1007/s12039-022-02125-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
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Etheridge ML, Hurley KR, Zhang J, Jeon S, Ring HL, Hogan C, Haynes CL, Garwood M, Bischof JC. Accounting for biological aggregation in heating and imaging of magnetic nanoparticles. TECHNOLOGY 2014; 2:214-228. [PMID: 25379513 PMCID: PMC4219565 DOI: 10.1142/s2339547814500198] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Aggregation is a known consequence of nanoparticle use in biology and medicine; however, nanoparticle characterization is typically performed under the pretext of well-dispersed, aqueous conditions. Here, we systematically characterize the effects of aggregation on the alternating magnetic field induced heating and magnetic resonance (MR) imaging performance of iron oxide nanoparticles (IONPs) in non-ideal biological systems. Specifically, the behavior of IONP aggregates composed of ~10 nm primary particles, but with aggregate hydrodynamic sizes ranging from 50 nm to 700 nm, was characterized in phosphate buffered saline and fetal bovine serum suspensions, as well as in gels and cells. We demonstrate up to a 50% reduction in heating, linked to the extent of aggregation. To quantify aggregate morphology, we used a combination of hydrodynamic radii distribution, intrinsic viscosity, and electron microscopy measurements to describe the aggregates as quasifractal entities with fractal dimensions in the 1.8-2.0 range. Importantly, we are able to correlate the observed decrease in magnetic field induced heating with a corresponding decrease in longitudinal relaxation rate (R1) in MR imaging, irrespective of the extent of aggregation. Finally, we show in vivo proof-of-principle use of this powerful new imaging method, providing a critical tool for predicting heating in clinical cancer hyperthermia.
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Affiliation(s)
- Michael L Etheridge
- Department of Mechanical Engineering, University of Minnesota, 111 Church Street SE, Minneapolis, MN 55455, USA. ; Department of Biomedical Engineering, University of Minnesota, 312 Church Street SE, Minneapolis, MN 55455, USA
| | - Katie R Hurley
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, MN 55455, USA
| | - Jinjin Zhang
- Center for Magnetic Resonance Research, University of Minnesota, 2021 Sixth Street SE, Minneapolis, MN 55455, USA. ; Department of Physics, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455, USA
| | - Seongho Jeon
- Department of Mechanical Engineering, University of Minnesota, 111 Church Street SE, Minneapolis, MN 55455, USA
| | - Hattie L Ring
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, MN 55455, USA. ; Center for Magnetic Resonance Research, University of Minnesota, 2021 Sixth Street SE, Minneapolis, MN 55455, USA
| | - Christopher Hogan
- Department of Mechanical Engineering, University of Minnesota, 111 Church Street SE, Minneapolis, MN 55455, USA
| | - Christy L Haynes
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, MN 55455, USA
| | - Michael Garwood
- Center for Magnetic Resonance Research, University of Minnesota, 2021 Sixth Street SE, Minneapolis, MN 55455, USA. ; Department of Radiology, University of Minnesota, 420 Delaware St SE, Minneapolis, MN 55455, USA
| | - John C Bischof
- Department of Mechanical Engineering, University of Minnesota, 111 Church Street SE, Minneapolis, MN 55455, USA. ; Department of Biomedical Engineering, University of Minnesota, 312 Church Street SE, Minneapolis, MN 55455, USA
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Al-Nemrawi NK, Dave RH. Formulation and characterization of acetaminophen nanoparticles in orally disintegrating films. Drug Deliv 2014; 23:540-9. [PMID: 25013958 DOI: 10.3109/10717544.2014.936987] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The purpose of this study was to prepare orally disintegrating films containing nanoparticles loaded with acetaminophen. Nanoparticles were prepared by the emulsion-solvent evaporation method where acetone phase containing acetaminophen and poly(lactide-co-glycolide acid) (PLGA) was added to water phase containing hydroxypropyl methyl cellulose, poly ethylene glycol, polyvinyl alcohol (PVA) and aspartame in a rate of 1.5 drop s(-1) and agitated at 1200 rpm. The size, polydispersity index (PI) and drug entrapment (DE) were measured. The emulsions were cast to form films, which were evaluated physico-mechanically. The effect of different degrees of hydrolization of PVA and polymerization of PLGA and the effect of different ratios of PVA to PLGA was studied. Films with acceptable physico-mechanical properties were further studied. The size and PI of the nanoparticles was dependent on PVA hydrolization, PLGA polymerization and the ratio of PVA to PLGA. All films disintegrated in less than one minute, but acetaminophen was not free in the dissolution media even after six days. These results may indicate that although the nanoparticles released from the films immediately when impressed in solution the drug is sustained in the nanoparticles for longer time, which is to be clarified in future work.
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Affiliation(s)
- Nusaiba K Al-Nemrawi
- a Division of Pharmaceutical Sciences , Long Island University , Brooklyn , NY , USA
| | - Rutesh H Dave
- a Division of Pharmaceutical Sciences , Long Island University , Brooklyn , NY , USA
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Fu K, Li S, Jiang X, Wang Y, Willis BG. DNA gold nanoparticle nanocomposite films for chemiresistive vapor sensing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:14335-14343. [PMID: 24111781 DOI: 10.1021/la402626p] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Chemiresistive vapor sensors combining functionalized gold nanoparticles and single-stranded DNA oligomers are investigated to enhance specificity in chemical sensing. Sensors are made by depositing DNA-functionalized gold nanoparticles onto microfabricated electrodes using four distinct sequences. Sensor performance is evaluated for response to relative humidity and exposure to vapor analytes including ethanol, methanol, hexane, dimethyl methylphosphonate, and toluene under different relative humidity. It is found that sensors display a nonmonotonic resistance change toward increasing humidity due to the combined effects of hydration induced swelling and ionic conduction. Responses to vapor analytes show sequence-dependent patterns as well as a strong influence of humidity. Overall, the findings are encouraging for using DNA oligomers to enhance specificity in chemical sensing.
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Affiliation(s)
- Kan Fu
- Department of Materials Science and Engineering, University of Connecticut , Storrs, Connecticut 06269, United States
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