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Adekunle AS, Oyekunle JAO, Durodola SS, Durosinmi LM, Doherty WO, Olayiwola MO, Adegboyega BC, Ajayeoba TA, Akinyele OF, Oluwafemi OS. Photocatalytic Degradation of Dyes in Wastewater Using Solar Enhanced Nickel Oxide (NiO) Nanocatalysts Prepared by Chemical Methods. J Fluoresc 2023:10.1007/s10895-023-03507-6. [PMID: 38038874 DOI: 10.1007/s10895-023-03507-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 08/17/2023] [Accepted: 11/08/2023] [Indexed: 12/02/2023]
Abstract
This study examined the surface morphology and photocatalytic activity of nickel oxide (NiO) nanoparticles prepared through a chemical method. The synthesized nanoparticle was characterized by using spectroscopic and microscopic techniques. Photocatalytic degradation of hazardous Eriochrome Black T (EBT) was carried out using the synthesized nanoparticle and the efficiency of the NiO used was determined. Highest degradation efficiency of 70% at 25 mg loading was observed at 40 min exposure time. The study concluded that the synthesized nanoparticles could be used in industrial wastewater treatment containing organic dyes.
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Affiliation(s)
- Abolanle S Adekunle
- Department of Chemistry, Obafemi Awolowo University, Ile-Ife, PMB, 220005, Nigeria.
| | - John A O Oyekunle
- Department of Chemistry, Obafemi Awolowo University, Ile-Ife, PMB, 220005, Nigeria
| | - Solomon S Durodola
- Department of Chemistry, Obafemi Awolowo University, Ile-Ife, PMB, 220005, Nigeria.
| | - Lateefat M Durosinmi
- Department of Chemistry, Obafemi Awolowo University, Ile-Ife, PMB, 220005, Nigeria
| | - Winston O Doherty
- Department of Chemistry, Obafemi Awolowo University, Ile-Ife, PMB, 220005, Nigeria
| | | | | | - Temitope A Ajayeoba
- Department of Chemistry, Obafemi Awolowo University, Ile-Ife, PMB, 220005, Nigeria
| | - Olawale F Akinyele
- Department of Chemistry, Obafemi Awolowo University, Ile-Ife, PMB, 220005, Nigeria
| | - Oluwatobi S Oluwafemi
- Department of Chemical Sciences, University of Johannesburg Doornfontein, Johannesburg, 2028, South Africa.
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, South Africa.
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2
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Aladesuyi OA, Oluwafemi OS. Synthesis of glutamine-based green emitting carbon quantum dots as a fluorescent nanoprobe for the determination of iron (Fe 3+) in Solanum tuberrosum (potato). Heliyon 2023; 9:e15904. [PMID: 37187900 PMCID: PMC10176077 DOI: 10.1016/j.heliyon.2023.e15904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 04/15/2023] [Accepted: 04/26/2023] [Indexed: 05/17/2023] Open
Abstract
Herein, we reported the use of N-doped green-emitting carbon quantum dots (N-CQDs) as a fluorescent probe for determining of Fe3+ ions in Solanum tuberosum for the first time. The N-CQDs were synthesised through an efficient, one-step, and safe hydrothermal technique using citric acid as the carbon source and glutamine as a novel nitrogen source. The temporal evolution of the optical properties was investigated by varying the synthetic conditions with respect to temperature (160 °C, 180 °C, 200 °C, 220 °C and 240 °C) and citric acid: glutamine precursor ratio (1:1, 1:1.5, l.2,1:3 and 1:4). The N-CQDs was characterised using Fourier-Transform Infra-red Spectroscopy (FTIR) High-resolution transmission electron microscope (HRTEM), ultraviolet-visible spectroscopy (UV-vis) and X-Ray diffraction analysis (XRD) while its stability was evaluated in different media; NaCl, Roswell Park Memorial Institute (RPMI) and Phosphate Buffered Saline (PBS), and at different pHs. The N-CQDs displayed green (525 nm) emission and were spherical with an average particle diameter of 3.41 ± 0.76 nm. The FTIR indicated carboxylic, amino, and hydroxyl functional groups. The as-synthesised N-CQDs were stable in NaCl (up to 1 M), RPMI, and PBS without any significant change in its fluorescent intensity. The pH evaluation showed pHs 6 and 7 as the optimum pHs, while the fluorometric analysis showed selectivity towards Fe 3+ in the presence and absence of interfering ions. The detection limit of 1.05 μM was calculated, and the photoluminescence mechanism revealed static quenching. The as-synthesised N-CQDs was used as a fluorescent nanoprobe to determine the amount of Fe3+ in Solanum tuberosum (Potatoes) tubers. The result showed a high level of accuracy (92.13-96.20%) when compared with an established standard analytical procedure with excellent recoveries of 99.23-103.9%. We believe the as-synthesised N-CQDs can be utilised as a reliable and fast fluorescence nanoprobe for the determining of Fe3+ ions.
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Affiliation(s)
- Olanrewaju A. Aladesuyi
- Department of Chemical Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa
| | - Oluwatobi S. Oluwafemi
- Department of Chemical Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa
- Corresponding author. Department of Chemical Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa.
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3
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Fanoro OT, Parani S, Maluleke R, Lebepe TC, Varghese RJ, Mgedle N, Mavumengwana V, Oluwafemi OS. Biosynthesis of Smaller-Sized Platinum Nanoparticles Using the Leaf Extract of Combretum erythrophyllum and Its Antibacterial Activities. Antibiotics (Basel) 2021; 10:1275. [PMID: 34827214 PMCID: PMC8614812 DOI: 10.3390/antibiotics10111275] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 10/15/2021] [Accepted: 10/16/2021] [Indexed: 11/29/2022] Open
Abstract
Nanobiotechnology is a promising field in the development of safe antibiotics to combat the increasing trend of antibiotic resistance. Nature is a vast reservoir for green materials used in the synthesis of non-toxic and environmentally friendly nano-antibiotics. We present for the first time a facile, green, cost-effective, plant-mediated synthesis of platinum nanoparticles (PtNPs) using the extract of Combretum erythrophyllum (CE) plant leaves. The extract of CE served as both a bio-reductant and a stabilizing agent. The as-synthesized PtNPs were characterized using ultraviolet-visible (UV-Vis) absorption spectroscopy, high-resolution transmission electron microscopy (HR-TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and dynamic light scattering (DLS) techniques. The HR-TEM image confirmed that the PtNPs are ultrasmall, spherical, and well dispersed with an average particle diameter of 1.04 ± 0.26 nm. The PtNPs showed strong antibacterial activities against pathogenic Gram-positive Staphylococcus epidermidis (ATCC 14990) at a minimum inhibitory concentration (MIC) of 3.125 µg/mL and Gram-negative Klebsiella oxytoca (ATCC 8724) and Klebsiella aerogenes (ATCC 27853) at an MIC value of 1.56 µg/mL. The CE-stabilized PtNPs was mostly effective in Klebsiella species that are causative organisms in nosocomial infections.
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Affiliation(s)
- Olufunto T. Fanoro
- Department of Biotechnology, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa; (O.T.F.); (V.M.)
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa; (S.P.); (R.M.); (T.C.L.); (R.J.V.); (N.M.)
| | - Sundararajan Parani
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa; (S.P.); (R.M.); (T.C.L.); (R.J.V.); (N.M.)
- Department of Chemical Sciences (Formerly Applied Chemistry), University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
| | - Rodney Maluleke
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa; (S.P.); (R.M.); (T.C.L.); (R.J.V.); (N.M.)
- Department of Chemical Sciences (Formerly Applied Chemistry), University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
| | - Thabang C. Lebepe
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa; (S.P.); (R.M.); (T.C.L.); (R.J.V.); (N.M.)
- Department of Chemical Sciences (Formerly Applied Chemistry), University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
| | - Rajendran J. Varghese
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa; (S.P.); (R.M.); (T.C.L.); (R.J.V.); (N.M.)
- Department of Chemical Sciences (Formerly Applied Chemistry), University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
| | - Nande Mgedle
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa; (S.P.); (R.M.); (T.C.L.); (R.J.V.); (N.M.)
- Department of Chemical Sciences (Formerly Applied Chemistry), University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
| | - Vuyo Mavumengwana
- Department of Biotechnology, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa; (O.T.F.); (V.M.)
| | - Oluwatobi S. Oluwafemi
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa; (S.P.); (R.M.); (T.C.L.); (R.J.V.); (N.M.)
- Department of Chemical Sciences (Formerly Applied Chemistry), University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
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4
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Oladipo AO, Lebepe TC, Ncapayi V, Tsolekile N, Parani S, Songca SP, Mori S, Kodama T, Oluwafemi OS. The Therapeutic Effect of Second Near-Infrared Absorbing Gold Nanorods on Metastatic Lymph Nodes via Lymphatic Delivery System. Pharmaceutics 2021; 13:pharmaceutics13091359. [PMID: 34575435 PMCID: PMC8466320 DOI: 10.3390/pharmaceutics13091359] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 08/06/2021] [Accepted: 08/10/2021] [Indexed: 11/17/2022] Open
Abstract
Photothermal therapy has been established recently as a non-invasive treatment protocol for cancer metastatic lymph nodes. Although this treatment approach shows efficient tumour ablation towards lymph node metastasis, the monitoring and reporting of treatment progress using the lymphatic delivery channel still need to be explored. Herein, we investigated the anti-tumour effect of pegylated gold nanorods with a high aspect ratio (PAuNRs) delivered via the lymphatic route in a mouse model. In this study, breast carcinoma (FM3A-Luc) cells were inoculated in the subiliac lymph node (SiLN) to induce metastasis in the proper axillary lymph node (PALN). The treatment was initiated by injecting the PAuNRs into the accessory axillary lymph node (AALN) after tumour metastasis was confirmed in the PALN followed by external NIR laser irradiation under a temperature-controlled cooling system. The anti-tumour impact of the treatment was evaluated using an in vivo bioluminescence imaging system (IVIS). The results showed a time-dependent reduction in tumour activity with significant treatment response. Tumour growth was inhibited in all mice treated with PAuNRs under laser irradiation; results were statistically significant (** p < 0.01) even after treatment was concluded on day 3. We believe that this non-invasive technique would provide more information on the dynamics of tumour therapy using the lymphatically administered route in preclinical studies.
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Affiliation(s)
- Adewale O. Oladipo
- Department of Chemical Sciences, University of Johannesburg Doornfontein Campus, Johannesburg 2028, South Africa; (A.O.O.); (T.C.L.); (V.N.); (N.T.); (S.P.)
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa
| | - Thabang C. Lebepe
- Department of Chemical Sciences, University of Johannesburg Doornfontein Campus, Johannesburg 2028, South Africa; (A.O.O.); (T.C.L.); (V.N.); (N.T.); (S.P.)
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa
| | - Vuyelwa Ncapayi
- Department of Chemical Sciences, University of Johannesburg Doornfontein Campus, Johannesburg 2028, South Africa; (A.O.O.); (T.C.L.); (V.N.); (N.T.); (S.P.)
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa
| | - Ncediwe Tsolekile
- Department of Chemical Sciences, University of Johannesburg Doornfontein Campus, Johannesburg 2028, South Africa; (A.O.O.); (T.C.L.); (V.N.); (N.T.); (S.P.)
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa
| | - Sundararajan Parani
- Department of Chemical Sciences, University of Johannesburg Doornfontein Campus, Johannesburg 2028, South Africa; (A.O.O.); (T.C.L.); (V.N.); (N.T.); (S.P.)
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa
| | - Sandile P. Songca
- Department of Chemistry, University of KwaZulu-Natal, Private Bag X 54001, Durban 4000, South Africa;
| | - Shiro Mori
- Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai 980-8575, Japan;
- Department of Oral and Maxillofacial Surgery, Tohoku University Hospital, 1-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Tetsuya Kodama
- Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai 980-8575, Japan;
- Correspondence: (T.K.); (O.S.O.)
| | - Oluwatobi S. Oluwafemi
- Department of Chemical Sciences, University of Johannesburg Doornfontein Campus, Johannesburg 2028, South Africa; (A.O.O.); (T.C.L.); (V.N.); (N.T.); (S.P.)
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa
- Correspondence: (T.K.); (O.S.O.)
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5
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Maluleke R, Parani S, Oluwafemi OS. Preparation of Graphene oxide- CuInS 2/ZnS Quantum dots Nanocomposite as "Turn-On" Fluorescent Probe for the Detection of Polycyclic Aromatic Hydrocarbons in Aqueous Medium. J Fluoresc 2021; 31:1297-1302. [PMID: 34101098 DOI: 10.1007/s10895-021-02761-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Accepted: 06/01/2021] [Indexed: 11/28/2022]
Abstract
Graphene oxide is well known for its adsorption properties with aromatic compounds. In this study, graphene oxide and eco-friendly ternary CuInS2/ZnS QDs were used to prepare graphene oxide-qunatum dots (GO-QDs) nanocomposite via in-situ method. The composite was characterized using ultraviolet-visible (UV-Vis) spectroscopy, photoluminescence (PL) spectroscopy, transmission electron microscopy (TEM) and Fourier transform infrared (FT-IR) spectroscopy. The effect of the polycyclic aromatic hydrocarbons (PAHs) on the PL properties of the nanocomposite was investigated. The results showed that the addition of PAHs increased the PL intensity of the nanocomposite. This "turn-on" fluorescence approach can be used for the successful detection of PAHs in aqueous media.
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Affiliation(s)
- Rodney Maluleke
- Department of Chemical Sciences, University of Johannesburg, Doornfontein, P.O. Box 17011, Johannesburg, 2028, South Africa.,Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein, P.O. Box 17011, Johannesburg, 2028, South Africa
| | - Sundararajan Parani
- Department of Chemical Sciences, University of Johannesburg, Doornfontein, P.O. Box 17011, Johannesburg, 2028, South Africa.,Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein, P.O. Box 17011, Johannesburg, 2028, South Africa
| | - Oluwatobi S Oluwafemi
- Department of Chemical Sciences, University of Johannesburg, Doornfontein, P.O. Box 17011, Johannesburg, 2028, South Africa. .,Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein, P.O. Box 17011, Johannesburg, 2028, South Africa.
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6
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Olayemi VT, Tella AC, Adekola FA, Clayton HS, Oladipo AC, Mehlana G, Ogunlaja AS, Oluwafemi OS, Ogar JO, Argent SP, Mokaya R. A Co-Crystallised Cobalt(II) Cluster of Pyridinedicarboxylic Acid (PDC) as a Luminescent Material for Selective Sensing of Methanol. J Fluoresc 2021; 31:1177-1190. [PMID: 34032972 DOI: 10.1007/s10895-021-02746-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 05/04/2021] [Indexed: 11/30/2022]
Abstract
A luminescent Cobalt(II) co-crystal [Co13(PDC)16(H2O)24.7H2O] 1 (where H2PDC = 2,6-pyridinedicarboxylic acid) have been prepared by oven-heating and slow evaporation of solvent. Single crystal X-ray diffraction (SCXRD) analysis revealed that 1 is a mixture of complexes that crystallizes in the triclinic space group P-1 and the geometry around the Co(II) ions is octahedral. The structure is extensively imbued with hydrogen bonding that helps in stabilizing the complex. Thermogravimetric analysis indicates that 1 is thermally stable up to 364 οC. The luminescence properties of 1 revealed a strong emission centered at 437 nm (λex = 345 nm) assigned to ligand to metal charge transfer (LMCT). The luminescence sensing of 1 towards volatile organic molecules were also examined. However, 1 displayed a turn off towards methanol compared to other molecules with high quenching efficiency and low limit of detection (3.5 × 10-4 vol%). The results show excellent selectively and high sensitivity. Powder X-ray diffraction studies revealed that the structural integrity of the complex was maintained after exposure to methanol vapour. Theoretical studies also revealed small binding energy (-413.2 au) and low energy gap (1.19) for 1-CH3OH adduct.
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Affiliation(s)
- Victoria T Olayemi
- Department of Chemistry, University of Ilorin, P.M. B 1515, Ilorin, Kwara State, Nigeria
- Department of Chemistry, Faculty of Pure and Applied Sciences, Kwara State University, P.M. B 1530, Malete, Nigeria
| | - Adedibu C Tella
- Department of Chemistry, University of Ilorin, P.M. B 1515, Ilorin, Kwara State, Nigeria.
- Department of Chemistry, University of South Africa, Pretoria, South Africa.
| | - Folahan A Adekola
- Department of Chemistry, University of Ilorin, P.M. B 1515, Ilorin, Kwara State, Nigeria
| | - Hadley S Clayton
- Department of Chemistry, University of South Africa, Pretoria, South Africa
| | - Adetola C Oladipo
- Department of Chemistry, University of Ilorin, P.M. B 1515, Ilorin, Kwara State, Nigeria
- Department of Physical Sciences, Landmark University, Omu-Aran, Kwara State, Nigeria
| | - Gift Mehlana
- Department of Chemical Technology, Faculty of Science and Technology Midlands State University (MSU), Gweru, Zimbabwe
| | - Adeniyi S Ogunlaja
- Department of Chemistry, Nelson Mandela University, P.O. Box 77000, Port Elizabeth, 6031, South Africa
| | - Oluwatobi S Oluwafemi
- Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa
| | - Joseph O Ogar
- School of Chemistry, University of Nottingham, NG7 2RD, University Park, Nottingham, UK
| | - Stephen P Argent
- School of Chemistry, University of Nottingham, NG7 2RD, University Park, Nottingham, UK
| | - Robert Mokaya
- School of Chemistry, University of Nottingham, NG7 2RD, University Park, Nottingham, UK
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7
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Fanoro OT, Oluwafemi OS. Bactericidal Antibacterial Mechanism of Plant Synthesized Silver, Gold and Bimetallic Nanoparticles. Pharmaceutics 2020; 12:E1044. [PMID: 33143388 PMCID: PMC7693967 DOI: 10.3390/pharmaceutics12111044] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 10/27/2020] [Accepted: 10/29/2020] [Indexed: 12/20/2022] Open
Abstract
As the field of nanomedicine develops and tackles the recent surge in antibiotic resistance, there is a need to have an in-depth understanding and a synergistic view of research on the effectiveness of a metal nanoparticle (NP) as an antibacterial agent especially their mechanisms of action. The constant development of bacterial resistance has led scientists to develop novel antibiotic agents. Silver, gold and its bimetallic combination are one of the most promising metal NPs because they show strong antibacterial activity. In this review we discuss the mode of synthesis and the proposed mechanism of biocidal antibacterial activity of metal NPs. These mechanisms include DNA degradation, protein oxidation, generation of reactive oxygen species, lipid peroxidation, ATP depletion, damage of biomolecules and membrane interaction.
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Affiliation(s)
- Olufunto T. Fanoro
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Johannesburg 2028, South Africa;
| | - Oluwatobi S. Oluwafemi
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Johannesburg 2028, South Africa;
- Department of Chemical Sciences (Formerly Applied Chemistry), University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa
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8
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Lebepe TC, Parani S, Oluwafemi OS. Graphene Oxide-Coated Gold Nanorods: Synthesis and Applications. Nanomaterials (Basel) 2020; 10:E2149. [PMID: 33126610 PMCID: PMC7693020 DOI: 10.3390/nano10112149] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 10/21/2020] [Accepted: 10/23/2020] [Indexed: 01/29/2023]
Abstract
The application of gold nanorods (AuNRs) and graphene oxide (GO) has been widely studied due to their unique properties. Although each material has its own challenges, their combination produces an exceptional material for many applications such as sensor, therapeutics, and many others. This review covers the progress made so far in the synthesis and application of GO-coated AuNRs (GO-AuNRs). Initially, it highlights different methods of synthesizing AuNRs and GO followed by two approaches (ex situ and in situ approaches) of coating AuNRs with GO. In addition, the properties of GO-AuNRs composite such as biocompatibility, photothermal profiling, and their various applications, which include photothermal therapy, theranostic, sensor, and other applications of GO-AuNRs are also discussed. The review concludes with challenges associated with GO-AuNRs and future perspectives.
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Affiliation(s)
- Thabang C. Lebepe
- Department of Chemical Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa; (T.C.L.); (S.P.)
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa
| | - Sundararajan Parani
- Department of Chemical Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa; (T.C.L.); (S.P.)
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa
| | - Oluwatobi S. Oluwafemi
- Department of Chemical Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa; (T.C.L.); (S.P.)
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa
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9
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Remya VPR, Jose Varghese R, Parani S, Sakho EHM, Oluwafemi OS, Thomas S. Compatibilization of epoxidized triblock copolymer on the generation of self‐assembled nanostructured epoxies and their surface wettability. J Appl Polym Sci 2020. [DOI: 10.1002/app.49985] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Vasudevan Pillai R. Remya
- Department of Chemical Sciences (formerly Applied Chemistry) University of Johannesburg Johannesburg South Africa
- Centre for Nanomaterials Science Research University of Johannesburg Johannesburg South Africa
| | - Rajendran Jose Varghese
- Department of Chemical Sciences (formerly Applied Chemistry) University of Johannesburg Johannesburg South Africa
- Centre for Nanomaterials Science Research University of Johannesburg Johannesburg South Africa
| | - Sundararajan Parani
- Department of Chemical Sciences (formerly Applied Chemistry) University of Johannesburg Johannesburg South Africa
- Centre for Nanomaterials Science Research University of Johannesburg Johannesburg South Africa
| | - El Hadji Mamour Sakho
- Department of Chemical Sciences (formerly Applied Chemistry) University of Johannesburg Johannesburg South Africa
- Centre for Nanomaterials Science Research University of Johannesburg Johannesburg South Africa
| | - Oluwatobi S. Oluwafemi
- Department of Chemical Sciences (formerly Applied Chemistry) University of Johannesburg Johannesburg South Africa
- Centre for Nanomaterials Science Research University of Johannesburg Johannesburg South Africa
| | - Sabu Thomas
- International and Inter University Centre for Nanoscience and Nanotechnology, School of Energy Materials Mahatma Gandhi University Kottayam India
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10
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Jose Varghese R, Parani S, Adeyemi OO, Remya VR, Sakho EHM, Maluleke R, Thomas S, Oluwafemi OS. Green Synthesis of Sodium Alginate Capped -CuInS 2 Quantum Dots with Improved Fluorescence Properties. J Fluoresc 2020; 30:1331-1335. [PMID: 32813189 DOI: 10.1007/s10895-020-02604-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 05/18/2020] [Accepted: 08/04/2020] [Indexed: 11/28/2022]
Abstract
CuInS2 (CIS) quantum dots (QDs) are known to be ideal fluorophores based on their low toxicity and tunable emission. However, due to low quantum yield (QY) and photostability, the surface is usually passivated by a higher bandgap shell (e.g. ZnS). This always resulted in a blue-shifted emission position which is not usually favourable for biological imaging. To address this problem, we herein report the passivation of green synthesized near infra-red emitting glutathione (GSH) capped CuInS2 QDs using different concentration of sodium alginate (SA) at different temperatures. The as-synthesized QDs are small (~ 3.2 nm), highly crystalline and emitted in the near infra-red region. The optical results showed a 36% increase in photostability and a 2-fold increase in quantum yield at ratio 1:8 (SA: CIS) which is suitable for prolonged biological imaging applications. Transmission electron microscope and X-ray diffraction (XRD) analyses showed that the materials are highly crystalline without any change in shape and size after passivation with the biopolymer. Graphical Abstract.
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Affiliation(s)
- R Jose Varghese
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. Box 17011, Johannesburg, Doornfontein, 2028, South Africa.,Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Johannesburg, Doornfontein, 2028, South Africa
| | - Sundararajan Parani
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. Box 17011, Johannesburg, Doornfontein, 2028, South Africa.,Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Johannesburg, Doornfontein, 2028, South Africa
| | - Olufemi O Adeyemi
- Department of Chemical Sciences, Olabisi Onabanjo University, P.O. Box 364, Ago-Iwoye, Ogun State, Nigeria
| | - V R Remya
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. Box 17011, Johannesburg, Doornfontein, 2028, South Africa.,Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Johannesburg, Doornfontein, 2028, South Africa
| | - El Hadji Mamour Sakho
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. Box 17011, Johannesburg, Doornfontein, 2028, South Africa.,Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Johannesburg, Doornfontein, 2028, South Africa
| | - Rodney Maluleke
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. Box 17011, Johannesburg, Doornfontein, 2028, South Africa.,Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Johannesburg, Doornfontein, 2028, South Africa
| | - Sabu Thomas
- International and Inter University Center for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala, India
| | - Oluwatobi S Oluwafemi
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. Box 17011, Johannesburg, Doornfontein, 2028, South Africa. .,Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Johannesburg, Doornfontein, 2028, South Africa.
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Jose Varghese R, Parani S, Remya VR, Maluleke R, Thomas S, Oluwafemi OS. Sodium alginate passivated CuInS 2/ZnS QDs encapsulated in the mesoporous channels of amine modified SBA 15 with excellent photostability and biocompatibility. Int J Biol Macromol 2020; 161:1470-1476. [PMID: 32745549 DOI: 10.1016/j.ijbiomac.2020.07.240] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 06/17/2020] [Revised: 07/20/2020] [Accepted: 07/22/2020] [Indexed: 01/09/2023]
Abstract
We herein report the synthesis of CuInS2/ZnS (CIS/ZnS) quantum dots (QDs) via a greener method followed by sodium alginate (SA) passivation and encapsulation into mesoporous channels of amine modified silica (SBA15-NH2) for improved photostability and biocompatibility. The as-synthesized CIS/ZnS QDs exhibited near infrared emission even after SA passivation and silica encapsulation. Transmission electron microscopy (TEM) and Small angle X-ray diffraction (XRD) revealed the mesoporous nature of the SBA-15 remained stable after loading with the SA-CIS/ZnS QDs. The effective encapsulation of SA-CIS/ZnS QDs inside the pores of SBA15-NH2 matrix was confirmed by Brunauer-Emmett-Teller (BET) pore volume analysis while the interaction between the QDs and SBA15-NH2 was confirmed using Fourier transform infrared (FTIR) spectroscopy. The photostability of the QDs was greatly enhanced after these modifications. The resultant SA-CIS/ZnS-SBA15-NH2 (QDs-silica) composite possessed remarkable biocompatibility towards lung cancer (A549) and kidney (HEK 293) cell lines making it a versatile material for theranostic applications.
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Affiliation(s)
- R Jose Varghese
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa; Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa
| | - Sundararajan Parani
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa; Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa
| | - V R Remya
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa; Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa
| | - Rodney Maluleke
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa; Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa
| | - Sabu Thomas
- International and Inter University Center for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kerala, India
| | - Oluwatobi S Oluwafemi
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa; Centre for Nanomaterials Science Research, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa.
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Amos-Tautua BM, Fakayode OJ, Songca SP, Oluwafemi OS. Effect of synthetic conditions on the crystallinity, porosity and magnetic properties of gluconic acid capped iron oxide nanoparticles. ACTA ACUST UNITED AC 2020. [DOI: 10.1016/j.nanoso.2020.100480] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Tsolekile N, Nahle S, Zikalala N, Parani S, Sakho EHM, Joubert O, Matoetoe MC, Songca SP, Oluwafemi OS. Cytotoxicity, fluorescence tagging and gene-expression study of CuInS/ZnS QDS - meso (hydroxyphenyl) porphyrin conjugate against human monocytic leukemia cells. Sci Rep 2020; 10:4936. [PMID: 32188925 PMCID: PMC7080734 DOI: 10.1038/s41598-020-61881-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 03/03/2020] [Indexed: 12/11/2022] Open
Abstract
The toxicity of heavy metals present in binary semiconductor nanoparticles also known as quantum dots (QDs) has hindered their wide applications hence the advent of non-toxic ternary quantum dots. These new group of quantum dots have been shown to possess some therapeutic action against cancer cell lines but not significant enough to be referred to as an ideal therapeutic agent. In this report, we address this problem by conjugating red emitting CuInS/ZnS QDs to a 5,10,15,20-tetrakis(3-hydroxyphenyl)porphyrin -photosensitizer for improved bioactivities. The glutathione capped CuInS/ZnS QDs were synthesized in an aqueous medium using a kitchen pressure cooker at different Cu: In ratios (1:4 and 1:8) and at varied temperatures (95 °C, 190 °C and 235 °C). Optical properties show that the as-synthesized CuInS/ZnS QDs become red-shifted compared to the core (CuInS) after passivation with emission in the red region while the cytotoxicity study revealed excellent cell viability against normal kidney fibroblasts (BHK21). The highly fluorescent, water-soluble QDs were conjugated to 5,10,15,20-tetrakis(3-hydroxyphenyl)porphyrin (mTHPP) via esterification reactions at room temperature. The resultant water-soluble conjugate was then used for the cytotoxicity, fluorescent imaging and gene expression study against human monocytic leukemia cells (THP-1). Our result showed that the conjugate possessed high cytotoxicity against THP-1 cells with enhanced localized cell uptake compared to the bare QDs. In addition, the gene expression study revealed that the conjugate induced inflammation compared to the QDs as NFKB gene was over-expressed upon cell inflammation while the singlet oxygen (1O2) study showed the conjugate possessed large amount of 1O2, three times than the bare porphyrin. Thus, the as-synthesized conjugate looks promising as a therapeutic agent for cancer therapy.
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Affiliation(s)
- Ncediwe Tsolekile
- Department of Chemical Sciences, University of Johannesburg, P. O. Box 17011, Doornfontein, 2028, Johannesburg, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, South Africa
- Department of Chemistry, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 2000, South Africa
| | - Sara Nahle
- Université De Lorraine, Faculté de Pharmacie, F-54001, Nancy Cedex, France
| | - Nkosingiphile Zikalala
- Department of Chemical Sciences, University of Johannesburg, P. O. Box 17011, Doornfontein, 2028, Johannesburg, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, South Africa
| | - Sundararajan Parani
- Department of Chemical Sciences, University of Johannesburg, P. O. Box 17011, Doornfontein, 2028, Johannesburg, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, South Africa
| | - El Hadji Mamour Sakho
- Department of Chemical Sciences, University of Johannesburg, P. O. Box 17011, Doornfontein, 2028, Johannesburg, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, South Africa
| | - Olivier Joubert
- Université De Lorraine, Faculté de Pharmacie, F-54001, Nancy Cedex, France
| | - Mangaka C Matoetoe
- Department of Chemistry, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 2000, South Africa
| | - Sandile P Songca
- Department of Chemistry, University of KwaZulu-Natal, Private Bag X 54001, Durban, 4000, South Africa
| | - Oluwatobi S Oluwafemi
- Department of Chemical Sciences, University of Johannesburg, P. O. Box 17011, Doornfontein, 2028, Johannesburg, South Africa.
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, South Africa.
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Adekunle AS, Oyekunle JA, Durosinmi LM, Oluwafemi OS, Olayanju DS, Akinola AS, Obisesan OR, Akinyele OF, Ajayeoba TA. Potential of cobalt and cobalt oxide nanoparticles as nanocatalyst towards dyes degradation in wastewater. ACTA ACUST UNITED AC 2020. [DOI: 10.1016/j.nanoso.2019.100405] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Oluwafemi OS, Anyik JL, Zikalala NE, Sakho EHM. Biosynthesis of silver nanoparticles from water hyacinth plant leaves extract for colourimetric sensing of heavy metals. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.nanoso.2019.100387] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Amos-Tautua BM, Fakayode OJ, Songca SP, Oluwafemi OS. Evolution of gluconic acid capped paramagnetic iron oxide nanoparticles. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.nanoso.2019.100389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Oluwafemi OS, May BMM, Parani S, Tsolekile N. Facile, large scale synthesis of water soluble AgInSe 2/ZnSe quantum dots and its cell viability assessment on different cell lines. Mater Sci Eng C Mater Biol Appl 2019; 106:110181. [PMID: 31753367 DOI: 10.1016/j.msec.2019.110181] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 08/09/2019] [Accepted: 09/09/2019] [Indexed: 11/25/2022]
Abstract
I-III-VI chalcopyrite ternary quantum dots have emerged as a good alternative over the conventional II-VI and IV-VI chalcogenide binary QDs that usually consist of heavy metals such as Cd and Pb which has limited their bioapplications. Among the chalcopyrite QDs, AgInSe2 QDs has been the least developed due to the imbalanced cation reactivity, unwanted impurities, broad size distribution and resultant large particle sizes. In addition, the cell viability of these QDs still needs to be investigated on different cell lines both normal and cancerous ones. Herein, large-scale synthesis of water-soluble thioglycolic acid (TGA) capped and gelatin-stabilized AgInSe2 (AISe) core and AgInSe2/ZnSe (AISe/ZnSe) core/shell QDs in the absence of an inert atmosphere and their cell viability against different cell lines are reported. The optical and structural characteristics of the as-synthesized QDs were investigated by UV-visible (vis) absorption, photoluminescence (PL) and Fourier-transmission infrared (FTIR) spectroscopies, dynamic light scattering (DLS), X-ray diffraction (XRD), and high-resolution transmission electron microscope (HRTEM) techniques. Growth of ZnSe shell on the core AISe resulted in the blue shifting of the emission maximum position with the increased PL intensity. The QDs are small and spherical in shape with an average particle diameter of 2.8 nm and 3.2 nm for AISe and AISe/ZnSe QDs respectively. The in vitro cell viability assay revealed that the as-synthesized AISe/ZnSe QDs are not toxic towards cancerous (HeLa -cervical cancer and A549-lung cancer) and normal (BHK21 -Kidney) cell lines.
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Affiliation(s)
- Oluwatobi S Oluwafemi
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. box 17011, Doornfontein, 2028 Johannesburg, South Africa; Center for Nanomaterials Science Research, University of Johannesburg, Doornfontein, South Africa.
| | - Bambesiwe M M May
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. box 17011, Doornfontein, 2028 Johannesburg, South Africa; Center for Nanomaterials Science Research, University of Johannesburg, Doornfontein, South Africa
| | - Sundararajan Parani
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. box 17011, Doornfontein, 2028 Johannesburg, South Africa; Center for Nanomaterials Science Research, University of Johannesburg, Doornfontein, South Africa
| | - Ncediwe Tsolekile
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, P.O. box 17011, Doornfontein, 2028 Johannesburg, South Africa; Center for Nanomaterials Science Research, University of Johannesburg, Doornfontein, South Africa
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Tsolekile N, Ncapayi V, Obiyenwa GK, Matoetoe M, Songca S, Oluwafemi OS. Synthesis of meso-tetra-(4-sulfonatophenyl) porphyrin (TPPS 4) - CuInS/ZnS quantum dots conjugate as an improved photosensitizer. Int J Nanomedicine 2019; 14:7065-7078. [PMID: 31507320 PMCID: PMC6720160 DOI: 10.2147/ijn.s211959] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 05/31/2019] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Metal-free, water-soluble and highly stable meso-tetra-(4-sulfonatophenyl) porphyrin (TPPS4) has been studied for their singlet oxygen quantum yield. However, TPPS4 suffers from inherent shortcomings. To address these, TPPS4 was conjugated to ternary copper indium sulphide/ zinc sulphide (CuInS2/ZnS) quantum dots (QDs). PURPOSE We herein report for the first time the synthesis of TPPS4-CuInS/ZnS QDs conjugate as an improved photosensitizer. METHODS Water-soluble TPPS4 was synthesized from tetraphenylporphyrin (TPPH2) after silica-gel purification. The CuInS/ZnS QDs were synthesized by hydrothermal method at a Cu:In ratio of 1:4. The porphyrin-QDs conjugate was formed via the daggling sulfonyl bond of the porphyrin and amine bond of the QDs. The effect of pH on the optical properties of TPPS4 was evaluated. The effect of Zn:Cu + In ratio on the ZnS shell passivation was examined to reduce structural defects on the as-synthesized QDs. RESULTS Various spectroscopic techniques were used to confirm the successful conversion of the organic TPPH2 to water-soluble TPPS4. The singlet oxygen generation evaluation shows an improved singlet oxygen quantum yield from 0.19 for the porphyrin (TPPS4) alone to 0.69 after conjugation (CuInS/ZnS-TPPS4) with an increase in the reaction rate constant (k (s-1)).
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Affiliation(s)
- Ncediwe Tsolekile
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, Johannesburg2028, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg2028, South Africa
- Department of Chemistry, Cape Peninsula University of Technology, Cape Town2000, South Africa
| | - Vuyelwa Ncapayi
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, Johannesburg2028, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg2028, South Africa
| | - Gabriel K Obiyenwa
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg2028, South Africa
- Department of Chemistry, Federal University Lokoja, Lokoja, Nigeria
| | - Mangaka Matoetoe
- Department of Chemistry, Cape Peninsula University of Technology, Cape Town2000, South Africa
| | - Sandile Songca
- Department of Chemistry, University of Zululand, Kwadlangezwa3886, South Africa
| | - Oluwatobi S Oluwafemi
- Department of Chemical Sciences (formerly Applied Chemistry), University of Johannesburg, Johannesburg2028, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg2028, South Africa
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Amos-Tautua BM, Songca SP, Oluwafemi OS. Application of Porphyrins in Antibacterial Photodynamic Therapy. Molecules 2019; 24:E2456. [PMID: 31277423 PMCID: PMC6650910 DOI: 10.3390/molecules24132456] [Citation(s) in RCA: 127] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 06/25/2019] [Accepted: 06/28/2019] [Indexed: 11/28/2022] Open
Abstract
Antibiotics are commonly used to control, treat, or prevent bacterial infections, however bacterial resistance to all known classes of traditional antibiotics has greatly increased in the past years especially in hospitals rendering certain therapies ineffective. To limit this emerging public health problem, there is a need to develop non-incursive, non-toxic, and new antimicrobial techniques that act more effectively and quicker than the current antibiotics. One of these effective techniques is antibacterial photodynamic therapy (aPDT). This review focuses on the application of porphyrins in the photo-inactivation of bacteria. Mechanisms of bacterial resistance and some of the current 'greener' methods of synthesis of meso-phenyl porphyrins are discussed. In addition, significance and limitations of aPDT are also discussed. Furthermore, we also elaborate on the current clinical applications and the future perspectives and directions of this non-antibiotic therapeutic strategy in combating infectious diseases.
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Affiliation(s)
- Bamidele M Amos-Tautua
- Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, P.O. Box 17011, Doornfontein 2028, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2000, South Africa
| | - Sandile P Songca
- Department of Chemistry, University of KwaZulu-Natal, Private Bag X 54001, Durban 4000, South Africa
| | - Oluwatobi S Oluwafemi
- Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, P.O. Box 17011, Doornfontein 2028, South Africa.
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2000, South Africa.
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Hlapisi N, Motaung TE, Linganiso LZ, Oluwafemi OS, Songca SP. Encapsulation of Gold Nanorods with Porphyrins for the Potential Treatment of Cancer and Bacterial Diseases: A Critical Review. Bioinorg Chem Appl 2019; 2019:7147128. [PMID: 31182957 PMCID: PMC6515112 DOI: 10.1155/2019/7147128] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Accepted: 02/04/2019] [Indexed: 01/23/2023] Open
Abstract
Cancer and bacterial diseases have been the most incidental diseases to date. According to the World Health Report 2018, at least every family is affected by cancer around the world. In 2012, 14.1 million people were affected by cancer, and that figure is bound to increase to 21.6 million in 2030. Medicine therefore sorts out ways of treatment using conventional methods which have been proven to have many side effects. Researchers developed photothermal and photodynamic methods to treat both cancer and bacterial diseases. These methods pose fewer effects on the biological systems but still no perfect method has been synthesized. The review serves to explore porphyrin and gold nanorods to be used in the treatment of cancer and bacterial diseases: porphyrins as photosensitizers and gold nanorods as delivery agents. In addition, the review delves into ways of incorporating photothermal and photodynamic therapy aimed at producing a less toxic, more efficacious, and specific compound for the treatment.
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Affiliation(s)
- Nthabeleng Hlapisi
- Department of Chemistry, University of Zululand, X1001, KwaDlangezwa, KwaZulu-Natal, South Africa
| | - Tshwafo E. Motaung
- Department of Chemistry, University of Zululand, X1001, KwaDlangezwa, KwaZulu-Natal, South Africa
| | - Linda Z. Linganiso
- Department of Chemistry, University of Zululand, X1001, KwaDlangezwa, KwaZulu-Natal, South Africa
| | - Oluwatobi S. Oluwafemi
- Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, South Africa
| | - Sandile P. Songca
- Department of Chemistry, University of Kwazulu Natal, Kwazulu Natal, South Africa
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Sakho EHM, Jose J, Thomas S, Kalarikkal N, Oluwafemi OS. Antimicrobial properties of MFe2O4 (M = Mn, Mg)/reduced graphene oxide composites synthesized via solvothermal method. Materials Science and Engineering: C 2019; 95:43-48. [DOI: 10.1016/j.msec.2018.10.067] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 10/05/2018] [Accepted: 10/19/2018] [Indexed: 12/23/2022]
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Matshetshe KI, Parani S, Manki SM, Oluwafemi OS. Preparation, characterization and in vitro release study of β-cyclodextrin/chitosan nanoparticles loaded Cinnamomum zeylanicum essential oil. Int J Biol Macromol 2018; 118:676-682. [DOI: 10.1016/j.ijbiomac.2018.06.125] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Revised: 06/16/2018] [Accepted: 06/25/2018] [Indexed: 11/16/2022]
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Fakayode OJ, Kruger CA, Songca SP, Abrahamse H, Oluwafemi OS. Photodynamic therapy evaluation of methoxypolyethyleneglycol-thiol-SPIONs-gold-meso-tetrakis(4-hydroxyphenyl)porphyrin conjugate against breast cancer cells. Mater Sci Eng C Mater Biol Appl 2018; 92:737-744. [PMID: 30184802 DOI: 10.1016/j.msec.2018.07.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 06/11/2018] [Accepted: 07/10/2018] [Indexed: 12/26/2022]
Abstract
Magnetic field enhanced photodynamic therapy is an effective non-invasive technique for the eradication of cancer diseases. In this report, magnetic field enhancement of the photodynamic therapy (PDT) efficacy of a novel methoxypolyethyleneglycol-thiol-SPIONs-gold-meso-tetrakis(4-hydroxyphenyl)porphyrin conjugate (nano-drug) against MCF-7 breast cancer cells was evaluated. The nano-drug exhibited excellent blue and red emissions under suitable ultraviolet (380 nm) and visible (430 nm) excitations and was well taken up by the cells without any significant dark cytotoxicity after 24 h post-incubation. However, after exposure of cells to light for about 15 min, high rate of cell death was observed in a dose-dependent manner. In addition, the cells that were exposed to external magnetic field displayed higher phototoxicity than the non-exposed cells. Altogether, these results suggest that the nano-porphyrin drug system can function as a new promising magnetic-field targeting agent for theranostic photodynamic eradication of cancer diseases.
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Affiliation(s)
- O J Fakayode
- Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa; Centre for Nanomaterials Research, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa
| | - C A Kruger
- Laser Research Centre, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa
| | - S P Songca
- Department of Chemistry, University of Zululand, Private Bag X1001, Kwadlangezwa 3886, South Africa
| | - H Abrahamse
- Laser Research Centre, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa
| | - O S Oluwafemi
- Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa; Centre for Nanomaterials Research, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa.
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Fakayode OJ, Tsolekile N, Songca SP, Oluwafemi OS. Applications of functionalized nanomaterials in photodynamic therapy. Biophys Rev 2018; 10:49-67. [PMID: 29294258 PMCID: PMC5803176 DOI: 10.1007/s12551-017-0383-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [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: 09/17/2017] [Accepted: 12/13/2017] [Indexed: 11/25/2022] Open
Abstract
Specially designed functionalized nanomaterials such as superparamagnetic iron oxide, gold, quantum dots and up- and down-conversion lanthanide series nanoparticles have consistently and completely revolutionized the biomedical environment over the past few years due to their specially inferring properties, such as specific drug delivery, plasmonic effect, optical and imaging properties, therapeutic thermal energy productionand excellent irresistible cellular penetration. These properties have been used to improve many existing disease treatment modalities and have led to the development of better therapeutic approaches for the advancement of the treatment of critical human diseases, such as cancers and related malaise. In photodynamic therapy, for example, where the delivery of therapeutic agents should ideally avoid toxicity on nearby healthy cells, superparamagnetic iron oxide nanoparticles have been shown to be capable of making photodynamic therapy (PDT) prodrugs and their associative targeting moieties tumor-specific via their unique response to an external magnetic fields. In this review, the nanomaterials commonly employed for the enhancement of photodynamic therapy are discussed. The review further describes the various methods of synthesis and characterization of these nanomaterials and highlights challenges for improving the efficacy of PDT in the future.
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Affiliation(s)
- Olayemi J Fakayode
- Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg, 2028, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, South Africa
| | - Ncediwe Tsolekile
- Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg, 2028, South Africa
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, South Africa
| | - Sandile P Songca
- Department of Chemistry, University of Zululand, PB X1001, Kwadlangezwa, 3886, South Africa
| | - Oluwatobi S Oluwafemi
- Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg, 2028, South Africa.
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, South Africa.
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Tella AC, Owalude SO, Olatunji SJ, Adimula VO, Elaigwu SE, Alimi LO, Ajibade PA, Oluwafemi OS. Synthesis of zinc-carboxylate metal-organic frameworks for the removal of emerging drug contaminant (amodiaquine) from aqueous solution. J Environ Sci (China) 2018; 64:264-275. [PMID: 29478648 DOI: 10.1016/j.jes.2017.06.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 06/02/2017] [Accepted: 06/13/2017] [Indexed: 05/09/2023]
Abstract
We herein report the removal of amodiaquine, an emerging drug contaminant from aqueous solution using [Zn2(fum)2(bpy)] and [Zn4O(bdc)3] (fum=fumaric acid; bpy=4,4-bipyridine; bdc=benzene-1,4-dicarboxylate) metal-organic frameworks (MOFs) as adsorbents. The adsorbents were characterized by elemental analysis, Fourier transform infrared (FT-IR) spectroscopy, and powder X-ray diffraction (PXRD). Adsorption process for both adsorbents were found to follow the pseudo-first-order kinetics, and the adsorption equilibrium data fitted best into the Freundlich isotherm with the R2 values of 0.973 and 0.993 obtained for [Zn2(fum)2(bpy)] and [Zn4O(bdc)3] respectively. The maximum adsorption capacities foramodiaquine in this study were found to be 0.478 and 47.62mg/g on the [Zn2(fum)2(bpy)] and [Zn4O(bdc)3] MOFs respectively, and were obtained at pH of 4.3 for both adsorbents. FT-IR spectroscopy analysis of the MOFs after the adsorption process showed the presence of the drug. The results of the study showed that the prepared MOFs could be used for the removal of amodiaquine from wastewater.
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Affiliation(s)
- Adedibu C Tella
- Department of Chemistry, University of Ilorin, P.M.B.1515 Ilorin, Nigeria.
| | - Samson O Owalude
- Department of Chemistry, University of Ilorin, P.M.B.1515 Ilorin, Nigeria
| | - Sunday J Olatunji
- Department of Chemistry, University of Ilorin, P.M.B.1515 Ilorin, Nigeria
| | - Vincent O Adimula
- Department of Chemistry, University of Ilorin, P.M.B.1515 Ilorin, Nigeria
| | - Sunday E Elaigwu
- Department of Chemistry, University of Ilorin, P.M.B.1515 Ilorin, Nigeria
| | - Lukman O Alimi
- Department of Chemistry and Polymer Science, Stellenbosch University, 7602 Stellenbosch, Western Cape, South Africa
| | - Peter A Ajibade
- School of Chemistry and Physics, University of KwaZulu-Natal, Scottsville 3209, South Africa
| | - Oluwatobi S Oluwafemi
- Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, Doornfontein, 2028 Johannesburg, South Africa; Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg, South Africa.
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Bhavitha KB, Nair AK, Mariya H, Jose J, Mayeen A, M. S. K, Saha A, Thomas S, Oluwafemi OS, Kalarikkal N. In situ dose dependent gamma ray irradiated synthesis of PMMA–Ag nanocomposite films for multifunctional applications. NEW J CHEM 2018. [DOI: 10.1039/c8nj02684j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein we report a simple, one pot and rapid gamma-ray irradiation method for the fabrication of PMMA–Ag nanocomposite films for multifunctional applications.
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Affiliation(s)
- K. B. Bhavitha
- Department of Physics
- St Teresas's College
- Ernakulam-682011
- India
- International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University
| | - Anju K. Nair
- Department of Physics
- St Teresas's College
- Ernakulam-682011
- India
- International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University
| | - Hanna Mariya
- International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University
- Kottayam-686 560
- India
| | - Jiya Jose
- International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University
- Kottayam-686 560
- India
| | - Anshida Mayeen
- School of Pure and Applied Physics, Mahatma Gandhi University
- Kottayam-686 560
- India
| | - Kala M. S.
- Department of Physics
- St Teresas's College
- Ernakulam-682011
- India
| | | | - Sabu Thomas
- International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University
- Kottayam-686 560
- India
- School of Chemical Sciences, Mahatma Gandhi University
- Kottayam-686 560
| | - Oluwatobi S. Oluwafemi
- Department of Applied Chemistry, University of Johannesburg
- Johannesburg 2028
- South Africa
- Centre for Nanomaterials Sciences Research, University of Johannesburg
- Johannesburg
| | - Nandakumar Kalarikkal
- International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University
- Kottayam-686 560
- India
- School of Pure and Applied Physics, Mahatma Gandhi University
- Kottayam-686 560
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Fakayode OJ, Songca SP, Oluwafemi OS. SPIONs as proton pump and electrostatic contributor for the simultaneous precipitation of protonated neutral red, Ag+ and chloride ion from aqueous solution. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2017.06.070] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Tsolekile N, Parani S, Matoetoe MC, Songca SP, Oluwafemi OS. Evolution of ternary I–III–VI QDs: Synthesis, characterization and application. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.nanoso.2017.08.012] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Chiguvare H, Oyedeji OO, Matewu R, Aremu O, Oyemitan IA, Oyedeji AO, Nkeh-Chungag BN, Songca SP, Mohan S, Oluwafemi OS. Synthesis of Silver Nanoparticles Using Buchu Plant Extracts and Their Analgesic Properties. Molecules 2016; 21:E774. [PMID: 27314316 PMCID: PMC6272985 DOI: 10.3390/molecules21060774] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Revised: 06/04/2016] [Accepted: 06/07/2016] [Indexed: 11/25/2022] Open
Abstract
We herein report for the first time the synthesis and analgesic properties of silver nanoparticles (Ag-NPs) using buchu plant extract. The as-synthesised Ag-NPs at different temperatures were characterised by UV-Vis spectroscopy, Fourier transform infra-red spectroscopy (FTIR) and transmission transform microscopy (TEM) to confirm the formation of silver nanoparticles. Phytochemical screening of the ethanolic extract revealed the presence of glycosides, proteins, tannins, alkaloids, flavonoids and saponins. The absorption spectra showed that the synthesis is temperature and time dependent. The TEM analysis showed that the as-synthesised Ag-NPs are polydispersed and spherical in shape with average particle diameter of 19.95 ± 7.76 nm while the FTIR results confirmed the reduction and capping of the as-synthesised Ag-NPs by the phytochemicals present in the ethanolic extract. The analgesic study indicated that the combined effect of the plant extract and Ag-NPs is more effective in pain management than both the aspirin drug and the extract alone.
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Affiliation(s)
- Herbert Chiguvare
- Department of Chemistry, Faculty of Science and Agriculture, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa.
| | - Opeoluwa O Oyedeji
- Department of Chemistry, Faculty of Science and Agriculture, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa.
| | - Reuben Matewu
- 1124 Buchanan Street, Ginsburg, King William's Town 5601, Eastern Cape, South Africa.
| | - Olukayode Aremu
- Department of Physiology, Faculty of Health Sciences, Walter Sisulu University, Nelson Mandela Drive Campus, Mthatha 5117, South Africa.
| | - Idris A Oyemitan
- Department of Chemical and Physical Sciences, Faculty of Natural Sciences, Walter Sisulu University, Nelson Mandela Drive Campus, P. Bag X1, Mthatha 5117, South Africa.
| | - Adebola O Oyedeji
- Department of Chemical and Physical Sciences, Faculty of Natural Sciences, Walter Sisulu University, Nelson Mandela Drive Campus, P. Bag X1, Mthatha 5117, South Africa.
| | - Benedicta N Nkeh-Chungag
- Department of Biological and Environmental Science Chemistry, Faculty of Natural Science, Walter Sisulu University, Nelson Mandela Drive Campus, P. BagX1, Mthatha 5117, South Africa.
| | - Sandile P Songca
- Department of Chemical and Physical Sciences, Faculty of Natural Sciences, Walter Sisulu University, Nelson Mandela Drive Campus, P. Bag X1, Mthatha 5117, South Africa.
| | - Sneha Mohan
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg Doornfontein 2028, South Africa.
| | - Oluwatobi S Oluwafemi
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg Doornfontein 2028, South Africa.
- Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, P.O. Box 17011, Doornfontein 2028, Gauteng, South Africa.
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Mohan S, Oluwafemi OS, Songca SP, Rouxel D, Miska P, Lewu FB, Kalarikkal N, Thomas S. Completely green synthesis of silver nanoparticle decorated MWCNT and its antibacterial and catalytic properties. PURE APPL CHEM 2016. [DOI: 10.1515/pac-2015-0602] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractWe herein report a simple large scale green synthesis route for the synthesis of silver nanoparticle (Ag-NP) multi walled carbon nanotubes (MWCNTs) hybrid nanocomposite (Ag-MWCNTs). The as-synthesized hybrid nanocomposite were characterized using UV-Vis absorption spectroscopy, Fourier transform infra-red spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction analysis (XRD) and high resolution transmission electron microscopy (HR-TEM). Raman spectroscopy analysis showed an increase in the D/G ratio of Ag-MWCNTs hybrid nanocomposites when compare with that of functionalized MWCNTs (F-MWCNTs) attributed to the presence of Ag-NPs on the surface of the F-MWCNTs. The as-synthesized Ag-MWCNTs nanocomposites showed strong antibacterial efficacy against Escherichia coli compared to the Ag-NPs and MWCNTs. The catalytic potential of the Ag-MWCNTs hybrid nanocomposite was investigated for the first time by studying the reduction of 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride at 299 K at various reaction times. The reaction follows first order kinetics with a rate constant of 5.18×10−1 s−1. It is believed that, the large scale synthesis of such hybrid nanocomposites via simple method using non-toxic reagent will not only enhance its antibacterial efficacy, durability and biocompatibility, it will also minimize its biotoxcity and environmental impacts.
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Affiliation(s)
| | - Oluwatobi S. Oluwafemi
- 3Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa
| | - Sandile P. Songca
- 4Department of Chemistry and Chemical Technology, Walter Sisulu University, Private bag X1, Mthatha 5117, South Africa
| | | | | | - Francis B. Lewu
- 7Department of Agriculture, Cape Peninsula University of Technology, Wellington, 7655, South Africa
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Mohan S, Oluwafemi OS, Songca SP, Jayachandran V, Rouxel D, Joubert O, Kalarikkal N, Thomas S. Synthesis, antibacterial, cytotoxicity and sensing properties of starch-capped silver nanoparticles. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2015.11.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Onwudiwe DC, Strydom CA, Oluwafemi OS, Hosten E, Jordaan A. Synthesis, spectral and thermal studies of pyridyl adducts of Zn(ii) and Cd(ii) dithiocarbamates, and their use as single source precursors for ZnS and CdS nanoparticles. Dalton Trans 2014; 43:8703-12. [PMID: 24769861 DOI: 10.1039/c4dt00610k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and characterization of pyridyl adducts of Zn(ii) and Cd(ii) dtc: precursors to ZnS and CdS nanoparticles are reported.
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Affiliation(s)
- Damian C. Onwudiwe
- Chemical Resource Beneficiation (CRB) Research Focus Area
- North-West University
- Potchefstroom 2520, South Africa
| | - Christien A. Strydom
- Chemical Resource Beneficiation (CRB) Research Focus Area
- North-West University
- Potchefstroom 2520, South Africa
| | - Oluwatobi S. Oluwafemi
- Department of Chemistry
- Cape-Peninsula University of Technology
- Capetown 8000, South Africa
| | - Eric Hosten
- Department of Chemistry
- Nelson Mandela Metropolitan University
- Port Elizabeth 6031, South Africa
| | - Anine Jordaan
- Laboratory for Electron Microscopy
- CRB Research Focus Area
- North-West University
- Potchefstroom 2520, South Africa
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Mohan S, Oluwafemi OS, Songca SP, Osibote OA, George SC, Kalarikkal N, Thomas S. Facile synthesis of transparent and fluorescent epoxy–CdSe–CdS–ZnS core–multi shell polymer nanocomposites. NEW J CHEM 2014. [DOI: 10.1039/c3nj00659j] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Tella AC, Owalude SO, Ojekanmi CA, Oluwafemi OS. Synthesis of copper–isonicotinate metal–organic frameworks simply by mixing solid reactants and investigation of their adsorptive properties for the removal of the fluorescein dye. NEW J CHEM 2014. [DOI: 10.1039/c4nj00411f] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The copper–isonicotinate metal–organic frameworks [Cu(INA)2] (INA = isonicotinate) (MOFs) has been prepared by a highly efficient and environmentally benign technique involving mixing and heating of solid reactants without milling. The adsorption of fluorescein dye on the as-synthesised [Cu(INA)2] was also investigated.
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Affiliation(s)
| | | | | | - Oluwatobi S. Oluwafemi
- Department of Chemistry
- Cape Peninsula University of Technology
- Cape Town 8000, South Africa
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Oluwafemi OS, Lucwaba Y, Gura A, Masabeya M, Ncapayi V, Olujimi OO, Songca SP. A facile completely 'green' size tunable synthesis of maltose-reduced silver nanoparticles without the use of any accelerator. Colloids Surf B Biointerfaces 2012; 102:718-23. [PMID: 23104035 DOI: 10.1016/j.colsurfb.2012.09.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Revised: 08/30/2012] [Accepted: 09/02/2012] [Indexed: 11/26/2022]
Abstract
A simple, straightforward, cost effective and environmentally benign method for the synthesis of highly stable and small sized silver nanoparticles (Ag-NPs) with narrow size distribution without the use of an accelerator is reported. Silver nitrate, gelatin and maltose, a non-toxic disaccharide sugar were used as silver precursor, stabiliser and reducing agent. By varying the precursor concentration and reaction time, we monitored the temporal evolution of the optical and structural properties of the as-synthesised Ag-NPs. The as-synthesised Ag-NPs were characterised using UV-vis absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD). The absorption maxima of the surface plasmon resonance (SPR) were blue-shifted as the reaction time increased indicating decrease in particle size. The TEM images showed that, the particles are small, well dispersed and spherical in shape. The smallest particles with an average particle diameter of 3.76±1.00 nm and 4.09±1.83 nm were obtained at 24h for the 1.0M and 0.5M silver ion precursor solution concentration respectively. The smaller particles produced were attributed to the higher concentration of the reducing saccharides in the reaction system, which in turn increases the formation of stable silver ions in the reaction system. The HRTEM images confirmed the crystalline nature of the material while the FTIR confirmed the stabilisation of the Ag-NPs by the gelatin.
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Affiliation(s)
- Oluwatobi S Oluwafemi
- Department of Chemistry and Chemical Technology, Walter Sisulu University, Mthatha Campus, Private Bag XI, Mthatha 5117, Eastern Cape, South Africa.
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Oluwafemi OS. A novel “green” synthesis of starch-capped CdSe nanostructures. Colloids Surf B Biointerfaces 2009; 73:382-6. [DOI: 10.1016/j.colsurfb.2009.06.011] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2009] [Revised: 05/26/2009] [Accepted: 06/08/2009] [Indexed: 10/20/2022]
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