|
1
|
Karki N, Davydov AV, Krylyuk S, Chusuei CC. Electrochemically Assaying Dopamine with p-Doped Silicon Nanowires. ANAL LETT 2022. [DOI: 10.1080/00032719.2022.2048845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Nawaraj Karki
- Chemistry Department, Middle Tennessee State University, Murfreesboro, TN, USA
| | - Albert V. Davydov
- Materials Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Sergiy Krylyuk
- Materials Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Charles C. Chusuei
- Chemistry Department, Middle Tennessee State University, Murfreesboro, TN, USA
| |
Collapse
|
|
2
|
Kader M, Weyer C, Avila A, Stealey S, Sell S, Zustiak SP, Buckner S, McBride-Gagyi S, Jelliss PA. Synthesis and Characterization of BaSO4-CaCO3-Alginate Nanocomposite Materials as Contrast Agents for Fine Vascular Imaging. ACS MATERIALS AU 2022; 2:260-268. [PMID: 36855388 PMCID: PMC9888639 DOI: 10.1021/acsmaterialsau.1c00070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Microcomputed tomography is an important technique for distinguishing the vascular network from tissues with similar X-ray attenuation. Here, we describe a composite of barium sulfate (BaSO4) nanoparticles, calcium carbonate (CaCO3) nanoparticles, and alginate that provides improved performance over microscale BaSO4 particles, which are currently used clinically as X-ray contrast agents. BaSO4 and CaCO3 nanoparticles were synthesized using a polyol method with tetraethylene glycol as solvent and capping agent. The nanoparticles show good colloidal stability in aqueous solutions. A deliverable nanocomposite gel contrast agent was produced by encapsulation of the BaSO4 and CaCO3 nanoparticles in an alginate gel matrix. The gelation time was controlled by addition of d-(+)-gluconic acid δ-lactone, which controls the rate of dissolution of the CaCO3 nanoparticles that produce Ca2+ which cross-links the gel. Rapid cross-linking of the gel by Ba2+ was minimized by producing BaSO4 nanoparticles with an excess of surface sulfate. The resulting BaSO4-CaCO3 nanoparticle alginate gel mechanical properties were characterized, including the gel storage modulus, peak stress and elastic modulus, and radiodensity. The resulting nanocomposite has good viscosity control and good final gel stiffness. The nanocomposite has gelation times between 30 and 35 min, adequate for full body perfusion. This is the first nanoscale composite of a radiopaque metal salt to be developed in combination with an alginate hydrogel and designed for medical perfusion and vascular imaging applications.
Collapse
Affiliation(s)
- Mohammad
S. Kader
- Department
of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, Missouri 63103, United States
| | - Conner Weyer
- Department
of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, Missouri 63103, United States
| | - Abigail Avila
- Department
of Biomedical Engineering, Parks College of Engineering, Aviation
and Technology, Saint Louis University, St. Louis, Missouri 63103, United States
| | - Samuel Stealey
- Department
of Biomedical Engineering, Parks College of Engineering, Aviation
and Technology, Saint Louis University, St. Louis, Missouri 63103, United States
| | - Scott Sell
- Department
of Biomedical Engineering, Parks College of Engineering, Aviation
and Technology, Saint Louis University, St. Louis, Missouri 63103, United States
| | - Silviya P. Zustiak
- Department
of Biomedical Engineering, Parks College of Engineering, Aviation
and Technology, Saint Louis University, St. Louis, Missouri 63103, United States
| | - Steven Buckner
- Department
of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, Missouri 63103, United States,
| | - Sara McBride-Gagyi
- Department
of Orthopaedic Surgery, Saint Louis University
School of Medicine, 1402
South Grand, St. Louis, Missouri 63110, United States,
| | - Paul A. Jelliss
- Department
of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, Missouri 63103, United States,
| |
Collapse
|
|
3
|
Pandey RR, Chusuei CC. Electrochemical Detection of Dopamine Using a Prussian Blue Carbon Nanotube Composite Decorated with Agglomerated ZnO Particles. ANAL LETT 2021. [DOI: 10.1080/00032719.2021.2010090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Raja Ram Pandey
- Department of Chemistry, Middle Tennessee State University, Murfreesboro, TN, USA
| | - Charles C. Chusuei
- Department of Chemistry, Middle Tennessee State University, Murfreesboro, TN, USA
| |
Collapse
|
|
4
|
Pandey RR, Chusuei CC. Carbon Nanotubes, Graphene, and Carbon Dots as Electrochemical Biosensing Composites. Molecules 2021; 26:6674. [PMID: 34771082 PMCID: PMC8587008 DOI: 10.3390/molecules26216674] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 10/27/2021] [Accepted: 10/28/2021] [Indexed: 12/20/2022] Open
Abstract
Carbon nanomaterials (CNMs) have been extensively used as electrochemical sensing composites due to their interesting chemical, electronic, and mechanical properties giving rise to increased performance. Due to these materials' unknown long-term ecological fate, care must be given to make their use tractable. In this review, the design and use of carbon nanotubes (CNTs), graphene, and carbon dots (CDs) as electrochemical sensing electrocatalysts applied to the working electrode surface are surveyed for various biosensing applications. Graphene and CDs are readily biodegradable as compared to CNTs. Design elements for CNTs that carry over to graphene and CDs include Coulombic attraction of components and using O or N atoms that serve as tethering points for attaching electrocatalytically active nanoparticles (NPs) and/or other additives.
Collapse
Affiliation(s)
| | - Charles C. Chusuei
- Department of Chemistry, Middle Tennessee State University, Murfreesboro, TN 37132, USA;
| |
Collapse
|
|
5
|
Abstract
3D hierarchical graphitic carbon nanowalls encapsulating cobalt nanoparticles HPC-Co were prepared in high yield from solid-state pyrolysis of cobalt 2,2′-bipyridine chloride complex. Annealing of HPC-Co in air gave HPC-CoO, which consists of a mixture of crystallite Co3O4 nanospheres and nanorods bursting out of mesoporous carbon. Both nanocomposites were fully characterized using SEM, TEM, BET, and powder X-ray diffraction. The elemental composition of both nanocomposites examined using SEM elemental mapping and TEM elemental mapping supports the successful doping of nitrogen. The powder X-ray diffraction studies supported the formation of hexagonal cobalt in HPC-Co, and cubic crystalline Co3O4 with cubic cobalt in HPC-CoO. HPC-Co and HPC-CoO can be used as a modified carbon electrode in cyclic voltammetry experiments for the detection of fructose with limit of detection LOD 0.5 mM. However, the single-frequency impedimetric method has a wider dynamic range of 8.0–53.0 mM and a sensitivity of 24.87 Ω mM−1 for the electrode modified with HPC-Co and 8.0–87.6 mM and a sensitivity of 1.988 Ω mM−1 for the electrode modified with HPC-CoO. The LOD values are 3 and 4 mM, respectively. The effect of interference increases in the following order: ascorbic acid, ethanol, urea, and glucose. A simple method was used with negligible interference from glucose to measure the percentage of fructose in a corn syrup sample with an HPC-CoO electrode. A specific capacitance of 47.0 F/g with 76.6% retentivity was achieved for HPC-Co and 28.2 F/g with 87.9% for HPC-CoO for 3000 charge–discharge cycles. Thus, (1) has better sensitivity and specific capacitance than (2), because (1) has a higher surface area and less agglomerated cobalt nanoparticles than (2).
Collapse
|