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Bi X, Watts DB, Dorman I, Kirk CM, Thomas M, Singleton I, Malcom C, Barnes T, Carter C, Liang A. Polyamidoamine dendrimer-mediated hydrogel for solubility enhancement and anti-cancer drug delivery. J Biomater Appl 2024; 38:733-742. [PMID: 37933579 DOI: 10.1177/08853282231213712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2023]
Abstract
The application of hydrogels for anti-cancer drug delivery has garnered considerable interest in the medical field. Current cancer treatment approaches, such as chemotherapy and radiation therapy, often induce severe side effects, causing significant distress and substantial health complications to patients. Hydrogels present an appealing solution as they can be precisely injected into specific sites within the body, facilitating the sustainable release of encapsulated drugs. This localized treatment approach holds great potential for reducing toxicity levels and improving drug delivery efficacy. In this study we developed a hydrogel delivery system containing polyamidoamine (PAMAM) dendrimer and polyethylene glycol (PEG) for solubility enhancement and sustained delivery of hydrophobic anti-cancer drugs. The three selected model drugs, e.g. silibinin, camptothecin, and methotrexate, possess limited aqueous solubility and thus face restricted application. In the presence of vinyl sulfone functionalized PAMAM dendrimer at 45 mg/mL concentration, drug solubility is increased by 37-fold, 4-fold, and 10-fold for silibinin, camptothecin, and methotrexate, respectively. By further crosslinking of the functionalized PAMAM dendrimer and thiolated PEG, we successfully developed a fast-crosslinking hydrogel capable of encapsulating a significant payload of solubilized cancer drugs for sustained release. In water, the drug encapsulated hydrogels release 30%-80% of their loads in 1-4 days. MTT assays of J82 and MCF7 cells with various doses of drug encapsulated hydrogels reveal that cytotoxicity is observed for all three drugs on both J82 and MCF7 cell lines after 48 h. Notably, camptothecin exhibits higher cytotoxicity to both cell lines than silibinin and methotrexate, achieving up to 95% cell death at experimental conditions, despite its lower solubility. Our experiments provide evidence that the PAMAM dendrimer-mediated hydrogel system significantly improves the solubility of hydrophobic drugs and facilitates their sustained release. These findings position the system as a promising platform for controlled delivery of hydrophobic drugs for intratumoral cancer treatment.
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Affiliation(s)
- Xiangdong Bi
- Department of Chemistry, Charleston Southern University, Charleston, SC, USA
| | - Darra B Watts
- Department of Chemistry, Charleston Southern University, Charleston, SC, USA
| | - Ian Dorman
- Department of Chemistry, Charleston Southern University, Charleston, SC, USA
| | - Casianna M Kirk
- Department of Chemistry, Charleston Southern University, Charleston, SC, USA
| | - Marisa Thomas
- Department of Chemistry, Charleston Southern University, Charleston, SC, USA
| | - Isaiah Singleton
- Department of Chemistry, Charleston Southern University, Charleston, SC, USA
| | - Colleen Malcom
- Department of Chemistry, Charleston Southern University, Charleston, SC, USA
| | - Taylor Barnes
- Department of Chemistry, Charleston Southern University, Charleston, SC, USA
| | - Colby Carter
- Department of Chemistry, Charleston Southern University, Charleston, SC, USA
| | - Aiye Liang
- Department of Chemistry, Charleston Southern University, Charleston, SC, USA
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Label-Free Detection of Saxitoxin with Field-Effect Device-Based Biosensor. NANOMATERIALS 2022; 12:nano12091505. [PMID: 35564214 PMCID: PMC9102806 DOI: 10.3390/nano12091505] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Revised: 04/23/2022] [Accepted: 04/26/2022] [Indexed: 11/16/2022]
Abstract
Saxitoxin (STX) is a highly toxic and widely distributed paralytic shellfish toxin (PSP), posing a serious hazard to the environment and human health. Thus, it is highly required to develop new STX detection approaches that are convenient, desirable, and affordable. This study presented a label-free electrolyte-insulator-semiconductor (EIS) sensor covered with a layer-by-layer developed positively charged Poly (amidoamine) (PAMAM) dendrimer. An aptamer (Apt), which is sensitive to STX was electrostatically immobilized onto the PAMAM dendrimer layer. This results in an Apt that is preferably flat inside a Debye length, resulting in less charge-screening effect and a higher sensor signal. Capacitance-voltage and constant-capacitance measurements were utilized to monitor each step of a sensor surface variation, namely, the immobilization of PAMAM dendrimers, Apt, and STX. Additionally, the surface morphology of PAMAM dendrimer layers was studied by using atomic force microscopy and scanning electron microscopy. Fluorescence microscopy was utilized to confirm that Apt was successfully immobilized on a PAMAM dendrimer-modified EIS sensor. The results presented an aptasensor with a detection range of 0.5–100 nM for STX detection and a limit of detection was 0.09 nM. Additionally, the aptasensor demonstrated high selectivity and 9-day stability. The extraction of mussel tissue indicated that an aptasensor may be applied to the detection of STX in real samples. An aptasensor enables marine toxin detection in a rapid and label-free manner.
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Senel M, Dervisevic M, Kokkokoğlu F. Electrochemical DNA biosensors for label-free breast cancer gene marker detection. Anal Bioanal Chem 2019; 411:2925-2935. [PMID: 30957202 DOI: 10.1007/s00216-019-01739-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 02/21/2019] [Accepted: 02/28/2019] [Indexed: 11/30/2022]
Abstract
We present an electrochemical DNA detection strategy based on self-assembled ferrocene-cored poly(amidoamine) dendrimers for the detection of a gene relevant to breast cancer. The chemisorption of three ferrocene-cored poly(amidoamine) generations and hybridization of single-stranded DNA on a Au electrode were studied by cyclic voltammetry and differential pulse voltammetry. The biosensor demonstrated high sensitivity of 0.13 μA/(ng/ml) in the detection of the target DNA with a linear range of 1.3-20 nM and a detection limit of 0.38 nM. The DNA biosensor also has high selectivity for the target DNA, showing a clear signal difference from a noncomplementary sequence and a single-base-mismatch sequence, which was used as a model of BRAC1 gene mutation. The results shown are highly motivating for exploring DNA biosensing technology in the diagnosis of breast cancer caused by mutation of the BRAC1 gene. Graphical abstract.
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Affiliation(s)
- Mehmet Senel
- SANKARA Brain & Biotechnology Research Center, Nanoyasam Nanobiotechnology Company, Technocity, Avcılar, 34320, Istanbul, Turkey.
| | - Muamer Dervisevic
- Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, 3052, Australia
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Zhao L, Yin S, Ma Z. Ca 2+-Triggered pH-Response Sodium Alginate Hydrogel Precipitation for Amplified Sandwich-Type Impedimetric Immunosensor of Tumor Marker. ACS Sens 2019; 4:450-455. [PMID: 30638376 DOI: 10.1021/acssensors.8b01465] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Signal amplification is of great significance in the ultrasensitive electrochemical impedimetric immunoassays for tumor marker detection. A cascaded signal amplification approach was designed using gold nanoparticle-CaCO3 microspheres (AuNP-CaCO3) to trigger pH-responsive alginate hydrogel precipitation for sandwich-type impedimetric immunosensor. AuNP-CaCO3 exerts a large hindrance effect and can release Ca2+ ions under weak acidic conditions, and thus can serve as a multifunctional label. The hindrance effect of AuNP-CaCO3 can significantly enhance the impedance response as the initial signal amplification. Then, part of CaCO3 dissolves under weak acid conditions and releases Ca2+, which can cross-link with alginate to generate an insoluble alginate hydrogel precipitate on the sensing interface, significantly increasing the impedance signal. The impedance signal can be further amplified by making the hydrogel negatively charged based on the pH-responsive surface charge properties of the alginate hydrogel. Benefiting from the cascaded signal amplification, this impedimetric immunosensor exhibits a linear range from 1.0 fg mL-1 to 100 ng mL-1, an detection limit of 0.09 fg mL-1, and ultrahigh sensitivity of 973.01 Ω (lg(ng mL-1))-1 toward the assay of prostate specific antigen (PSA).
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Affiliation(s)
- Lihua Zhao
- Department of Chemistry, Capital Normal University, Beijing 100048, China
| | - Shuang Yin
- Department of Chemistry, Capital Normal University, Beijing 100048, China
| | - Zhanfang Ma
- Department of Chemistry, Capital Normal University, Beijing 100048, China
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Jin X, Zhou L, Zhu B, Jiang X, Zhu N. Silver-dendrimer nanocomposites as oligonucleotide labels for electrochemical stripping detection of DNA hybridization. Biosens Bioelectron 2018; 107:237-243. [PMID: 29477124 DOI: 10.1016/j.bios.2018.02.033] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 01/30/2018] [Accepted: 02/12/2018] [Indexed: 01/07/2023]
Abstract
Silver-dendrimer nanocomposites were synthesized and used as oligonucleotide labels for electrochemical stripping detection of DNA hybridization. The synthesized silver-dendrimer nanocomposites were characterized by UV-vis spectrophotometry, X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Ratios of silver/dendrimer were optimized in order to obtain stable nanocomposites with maximal silver loading in the interior of a polymeric shell. The silver-dendrimer nanocomposites were attached to sequence-known DNA probes specific to colitoxin, and used to detect probe hybridization by dissolution of the silver nanoparticles in the interior of dendrimer in a diluted nitric acid, followed by measurement of Ag+ ions by anodic stripping voltammetry (ASV). Use of differential pulse voltammetry for the stripping step, along with optimization of the ASV conditions, enabled a detection limit of 0.78 pM. The present strategy, in combination with dendrimer-encapsulated copper labeled oligonucleotides probe reported previously, could potentially be used to detect single or multiple DNA targets in one sample.
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Affiliation(s)
- Xin Jin
- Department of Chemistry, College of Life and Environment Sciences, Shanghai Normal University, Guilin Road 100, Shanghai 200234, China
| | - Ling Zhou
- Department of Chemistry, College of Life and Environment Sciences, Shanghai Normal University, Guilin Road 100, Shanghai 200234, China
| | - Bo Zhu
- Department of Chemistry, College of Life and Environment Sciences, Shanghai Normal University, Guilin Road 100, Shanghai 200234, China
| | - Xue Jiang
- Department of Chemistry, College of Life and Environment Sciences, Shanghai Normal University, Guilin Road 100, Shanghai 200234, China
| | - Ningning Zhu
- Department of Chemistry, College of Life and Environment Sciences, Shanghai Normal University, Guilin Road 100, Shanghai 200234, China.
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6
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Corrigan D, Schulze H, Ciani I, Henihan G, Mount A, Bachmann T. Improving performance of a rapid electrochemical MRSA assay: Optimisation of assay conditions to achieve enhanced discrimination of clinically important DNA sequences under ambient conditions. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2016.12.050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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7
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Miodek A, Mejri-Omrani N, Khoder R, Korri-Youssoufi H. Electrochemical functionalization of polypyrrole through amine oxidation of poly(amidoamine) dendrimers: Application to DNA biosensor. Talanta 2016; 154:446-54. [DOI: 10.1016/j.talanta.2016.03.076] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 03/21/2016] [Accepted: 03/23/2016] [Indexed: 10/22/2022]
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Ahmed S, Vepuri SB, Kalhapure RS, Govender T. Interactions of dendrimers with biological drug targets: reality or mystery - a gap in drug delivery and development research. Biomater Sci 2016; 4:1032-50. [PMID: 27100841 DOI: 10.1039/c6bm00090h] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Dendrimers have emerged as novel and efficient materials that can be used as therapeutic agents/drugs or as drug delivery carriers to enhance therapeutic outcomes. Molecular dendrimer interactions are central to their applications and realising their potential. The molecular interactions of dendrimers with drugs or other materials in drug delivery systems or drug conjugates have been extensively reported in the literature. However, despite the growing application of dendrimers as biologically active materials, research focusing on the mechanistic analysis of dendrimer interactions with therapeutic biological targets is currently lacking in the literature. This comprehensive review on dendrimers over the last 15 years therefore attempts to identify the reasons behind the apparent lack of dendrimer-receptor research and proposes approaches to address this issue. The structure, hierarchy and applications of dendrimers are briefly highlighted, followed by a review of their various applications, specifically as biologically active materials, with a focus on their interactions at the target site. It concludes with a technical guide to assist researchers on how to employ various molecular modelling and computational approaches for research on dendrimer interactions with biological targets at a molecular level. This review highlights the impact of a mechanistic analysis of dendrimer interactions on a molecular level, serves to guide and optimise their discovery as medicinal agents, and hopes to stimulate multidisciplinary research between scientific, experimental and molecular modelling research teams.
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Affiliation(s)
- Shaimaa Ahmed
- Discipline of Pharmaceutical Sciences, School of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban, 4000, South Africa.
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9
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Signal amplification strategies for DNA and protein detection based on polymeric nanocomposites and polymerization: A review. Anal Chim Acta 2015; 877:19-32. [DOI: 10.1016/j.aca.2015.01.034] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 01/16/2015] [Accepted: 01/20/2015] [Indexed: 11/23/2022]
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10
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Evtyugin GA, Stoikova EE. Electrochemical biosensors based on dendrimers. JOURNAL OF ANALYTICAL CHEMISTRY 2015. [DOI: 10.1134/s1061934815050044] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Improving electrochemical biosensor performance by understanding the influence of target DNA length on assay sensitivity. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2014.08.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Corrigan DK, Schulze H, Henihan G, Hardie A, Ciani I, Giraud G, Terry JG, Walton AJ, Pethig R, Ghazal P, Crain J, Campbell CJ, Templeton KE, Mount AR, Bachmann TT. Development of a PCR-free electrochemical point of care test for clinical detection of methicillin resistant Staphylococcus aureus (MRSA). Analyst 2014; 138:6997-7005. [PMID: 24093127 DOI: 10.1039/c3an01319g] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An MRSA assay requiring neither labeling nor amplification of target DNA has been developed. Sequence specific binding of fragments of bacterial genomic DNA is detected at femtomolar concentrations using electrochemical impedance spectroscopy (EIS). This has been achieved using systematic optimisation of probe chemistry (PNA self-assembled monolayer film on gold electrode), electrode film structure (the size and nature of the chemical spacer) and DNA fragmentation, as these are found to play an important role in assay performance. These sensitivity improvements allow the elimination of the PCR step and DNA labeling and facilitate the development of a simple and rapid point of care test for MRSA. Assay performance is then evaluated and specific direct detection of the MRSA diagnostic mecA gene from genomic DNA, extracted directly from bacteria without further treatment is demonstrated for bacteria spiked into saline (10(6) cells per mL) on gold macrodisc electrodes and into human wound fluid (10(4) cells per mL) on screen printed gold electrodes. The latter detection level is particularly relevant to clinical requirements and point of care testing where the general threshold for considering a wound to be infected is 10(5) cells per mL. By eliminating the PCR step typically employed in nucleic acid assays, using screen printed electrodes and achieving sequence specific discrimination under ambient conditions, the test is extremely simple to design and engineer. In combination with a time to result of a few minutes this means the assay is well placed for use in point of care testing.
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Affiliation(s)
- D K Corrigan
- Division of Pathway Medicine, Medical School, The University of Edinburgh, Chancellor's Building, 49 Little France Crescent, Edinburgh EH16 4SB, Scotland, UK.
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13
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Liu L, Jiang S, Wang L, Zhang Z, Xie G. Direct detection of microRNA-126 at a femtomolar level using a glassy carbon electrode modified with chitosan, graphene sheets, and a poly(amidoamine) dendrimer composite with gold and silver nanoclusters. Mikrochim Acta 2014. [DOI: 10.1007/s00604-014-1273-y] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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14
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Mese F, Congur G, Erdem A. Voltammetric and impedimetric detection of DNA hybridization by using dendrimer modified graphite electrodes. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2014.02.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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15
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Hasanzadeh M, Shadjou N, Eskandani M, Soleymani J, Jafari F, de la Guardia M. Dendrimer-encapsulated and cored metal nanoparticles for electrochemical nanobiosensing. Trends Analyt Chem 2014. [DOI: 10.1016/j.trac.2013.09.015] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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16
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FU C, LI JP. Application of Dendrimers in Analytical Chemistry. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2013. [DOI: 10.1016/s1872-2040(13)60692-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Malecka K, Grabowska I, Radecki J, Stachyra A, Góra-Sochacka A, Sirko A, Radecka H. Electrochemical Detection of Avian Influenza Virus Genotype Using Amino-ssDNA Probe Modified Gold Electrodes. ELECTROANAL 2013. [DOI: 10.1002/elan.201300113] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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18
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Gao H, Jiang X, Dong YJ, Tang WX, Hou C, Zhu NN. Dendrimer-encapsulated copper as a novel oligonucleotides label for sensitive electrochemical stripping detection of DNA hybridization. Biosens Bioelectron 2013; 48:210-5. [PMID: 23685561 DOI: 10.1016/j.bios.2013.04.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Revised: 04/17/2013] [Accepted: 04/17/2013] [Indexed: 10/26/2022]
Abstract
This paper describes the synthesis and characterization of a novel electrochemical label for sensitive electrochemical stripping detection of DNA hybridization based on dendrimer-encapsulated copper. The generation 4.5 (G 4.5) carboxyl-terminated poly(amidoamine) dendrimer with a trimesyl core was used as a template for synthesis of Cu²⁺/dendrimer nanocomposites (Cu-DNCs). Ratios of Cu²⁺/dendrimer were optimized in order to obtain stable nanocomposites with maximal copper loading in the interior of a polymeric shell. Cu-DNCs labeled DNA probe was employed for determining a target ssDNA immobilized on multi-walled carbon nanotubes-modified glassy carbon electrode (GCE) based on a specific hybridization reaction. The hybridization events were monitored by electrochemical detection of Cu anchored on the hybrids after the release in a diluted nitric acid by anodic stripping differential pulse voltammetry (ASDPV). The results showed that only a complementary sequence could form a dsDNA with the Cu-DNCs DNA probe and give an obvious electrochemical signal. The non-complementary sequence exhibited negligible signal change compared with the blank measurement (means: the electrode containing no target DNA incubating in hybridization buffer solution containing Cu-DNCs DNA probe for a certain time). The use of Cu encapsulated-dendrimer as tags and ASDPV for the detection of the released Cu ions could enhance the hybridization signal, and result in the increase of the sensitivity for the target DNA. Under the conditions employed here, the detection limit for measuring the full complementary sequence is down to pM level.
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Affiliation(s)
- Huan Gao
- Department of Chemistry, College of Life and Environment Sciences, Shanghai Normal University, Guilin Road 100, Shanghai 200234, China
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19
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Díez P, Piuleac CG, Martínez-Ruiz P, Romano S, Gamella M, Villalonga R, Pingarrón JM. Supramolecular immobilization of glucose oxidase on gold coated with cyclodextrin-modified cysteamine core PAMAM G-4 dendron/Pt nanoparticles for mediatorless biosensor design. Anal Bioanal Chem 2012; 405:3773-81. [DOI: 10.1007/s00216-012-6491-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Revised: 09/28/2012] [Accepted: 10/09/2012] [Indexed: 12/01/2022]
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20
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Zhang Y, Jiang W. Decorating graphene sheets with gold nanoparticles for the detection of sequence-specific DNA. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.03.136] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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21
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Impedimetric detection of single-stranded PCR products derived from methicillin resistant Staphylococcus aureus (MRSA) isolates. Biosens Bioelectron 2012; 34:178-84. [DOI: 10.1016/j.bios.2012.01.040] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Revised: 01/25/2012] [Accepted: 01/29/2012] [Indexed: 11/21/2022]
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22
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Modified gold surfaces by poly(amidoamine) dendrimers and fructose dehydrogenase for mediated fructose sensing. Talanta 2011; 87:67-73. [DOI: 10.1016/j.talanta.2011.09.042] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Revised: 09/16/2011] [Accepted: 09/24/2011] [Indexed: 11/18/2022]
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23
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Altintas Z, Uludag Y, Gurbuz Y, Tothill I. Development of surface chemistry for surface plasmon resonance based sensors for the detection of proteins and DNA molecules. Anal Chim Acta 2011; 712:138-44. [PMID: 22177077 DOI: 10.1016/j.aca.2011.11.026] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Revised: 10/26/2011] [Accepted: 11/10/2011] [Indexed: 10/15/2022]
Abstract
The immobilisation of biological recognition elements onto a sensor chip surface is a crucial step for the construction of biosensors. While some of the optical biosensors utilise silicon dioxide as the sensor surface, most of the biosensor surfaces are coated with metals for transduction of the signal. Biological recognition elements such as proteins can be adsorbed spontaneously on metal or silicon dioxide substrates but this may denature the molecule and can result in either activity reduction or loss. Self assembled monolayers (SAMs) provide an effective method to protect the biological recognition elements from the sensor surface, thereby providing ligand immobilisation that enables the repeated binding and regeneration cycles to be performed without losing the immobilised ligand, as well as additionally helping to minimise non-specific adsorption. Therefore, in this study different surface chemistries were constructed on SPR sensor chips to investigate protein and DNA immobilisation on Au surfaces. A cysteamine surface and 1%, 10% and 100% mercaptoundecanoic acid (MUDA) coatings with or without dendrimer modification were utilised to construct the various sensor surfaces used in this investigation. A higher response was obtained for NeutrAvidin immobilisation on dendrimer modified surfaces compared to MUDA and cysteamine layers, however, protein or DNA capture responses on the immobilised NeutrAvidin did not show a similar higher response when dendrimer modified surfaces were used.
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Affiliation(s)
- Zeynep Altintas
- Cranfield University, Cranfield Health, Cranfield, Bedfordshire, UK
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24
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Liu P, Hun X, Qing H. Dendrimer-based biosensor for chemiluminescent detection of DNA hybridization. Mikrochim Acta 2011. [DOI: 10.1007/s00604-011-0637-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Martinovic J, van Wyk J, Mapolie S, Jahed N, Baker P, Iwuoha E. Electrochemical and spectroscopic properties of dendritic cobalto-salicylaldiimine DNA biosensor. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2009.06.065] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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26
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Stojanovic N, Murphy LD, Wagner BD. Fluorescence-based comparative binding studies of the supramolecular host properties of PAMAM dendrimers using anilinonaphthalene sulfonates: unusual host-dependent fluorescence titration behavior. SENSORS (BASEL, SWITZERLAND) 2010; 10:4053-70. [PMID: 22319341 PMCID: PMC3274260 DOI: 10.3390/s100404053] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2010] [Revised: 03/31/2010] [Accepted: 04/13/2010] [Indexed: 11/21/2022]
Abstract
This work describes the fluorescence enhancement of the anilinonaphthalene sulfonate probes 1,8-ANS, 2,6-ANS, and 2,6-TNS via complexation with PAMAM dendrimer hosts of Generation 4, 5 and 6. The use of this set of three very closely related probes allows for comparative binding studies, with specific pairs of probes differing only in shape (1,8-ANS and 2,6-ANS), or in the presence of a methyl substituent (2,6-TNS vs. 2,6-ANS). The fluorescence of all three probes was significantly enhanced upon binding with PAMAM dendrimers, however in all cases except one, a very unusual spike was consistently observed in the host fluorescence titration plots (fluorescence enhancement vs. host concentration) at low dendrimer concentration. This unprecedented fluorescence titration curve shape makes fitting the data to a simple model such as 1:1 or 2:1 host: guest complexation very difficult; thus only qualitative comparisons of the relative binding of the three guests could be made based on host titrations. In the case of G4 and G5 dendrimers, the order of binding strength was qualitatively determined to be 1,8-ANS<2,6-ANS indicating that the more streamlined 2,6-substituted probes are a better match for the dendrimer cavity shape than the bulkier 1,8-substituted probe. This order of binding strength was also indicated by double fluorometric titration experiments, involving both host and guest titrations. Further double fluorometric titration experiments on 2,6-ANS in G4 dendrimer revealed a host concentration-dependent change in the nature of the host: guest complexation, with multiple guests complexed per host molecule at very low host concentrations, but less than one guest per host at higher concentrations.
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Affiliation(s)
- Natasa Stojanovic
- Department of Chemistry, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada; E-Mails: (N.S.); (L.M.)
| | - Laurel D. Murphy
- Department of Chemistry, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada; E-Mails: (N.S.); (L.M.)
| | - Brian D. Wagner
- Department of Chemistry, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada; E-Mails: (N.S.); (L.M.)
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Moreno M, Rincon E, Pérez JM, González VM, Domingo A, Dominguez E. Selective immobilization of oligonucleotide-modified gold nanoparticles by electrodeposition on screen-printed electrodes. Biosens Bioelectron 2009; 25:778-83. [PMID: 19783422 DOI: 10.1016/j.bios.2009.08.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2009] [Revised: 08/17/2009] [Accepted: 08/19/2009] [Indexed: 02/05/2023]
Abstract
Here, we describe a proof of concept procedure for the selective immobilization of oligonucleotides functionalized gold nanoparticle probes (affinity modules) on arrayed screen-printed gold electrodes. Current microarrays are using many different ways to address their DNA probes onto the transducer area. For that reason, we have mixed the electrodeposition of metals, which is a very well known process, in addition with the DNA-gold nanoparticles formation, which is an area of great interest in biosensing applications in the field of genomics, clinical and warfare applications. Combining these fields, we have developed a novel method for the immobilization of gold nanoparticles conjugated with oligonucleotides (affinity modules) onto screenprinting gold electrodes through electrodeposition at a current positive potential of 800mV vs. Ag/AgCl. The modules were selectively immobilized onto the electrode surface being, afterwards, ready for a successful hybridization. The gold colloids take the advantage of being a carrier that allows the immobilization of any kind of bioreceptor in the same conditions and the capability of quality control analysis before the electrodeposition procedure. With this system, we avoided non-specific interactions between the transduction layer and the bioreceptor and in the case of DNA oligonucleotides allowed us the immobilization of multiple sequences in a multimodular device for a further industrial process of cheaper biochip fabrication.
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Affiliation(s)
- M Moreno
- Departamento Bioquímica y Biología Molecular, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain.
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Park JY, Park SM. DNA hybridization sensors based on electrochemical impedance spectroscopy as a detection tool. SENSORS (BASEL, SWITZERLAND) 2009; 9:9513-32. [PMID: 22303136 PMCID: PMC3267184 DOI: 10.3390/s91209513] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2009] [Revised: 10/28/2009] [Accepted: 11/11/2009] [Indexed: 12/18/2022]
Abstract
Recent advances in label free DNA hybridization sensors employing electrochemical impedance spectroscopy (EIS) as a detection tool are reviewed. These sensors are based on the modulation of the blocking ability of an electrode modified with a probe DNA by an analyte, i.e., target DNA. The probe DNA is immobilized on a self-assembled monolayer, a conducting polymer film, or a layer of nanostructures on the electrode such that desired probe DNA would selectively hybridize with target DNA. The rate of charge transfer from the electrode thus modified to a redox indicator, e.g., [Fe(CN)(6)](3-/4-), which is measured by EIS in the form of charge transfer resistance (R(ct)), is modulated by whether or not, as well as how much, the intended target DNA is selectively hybridized. Efforts made to enhance the selectivity as well as the sensitivity of DNA sensors and to reduce the EIS measurement time are briefly described along with brief future perspectives in developing DNA sensors.
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Affiliation(s)
- Jin-Young Park
- Department of Chemistry, Pohang University of Science & Technology, Pohang 790-784, Korea; E-Mail:
| | - Su-Moon Park
- Interdisciplinary School of Green Energy Engineering, Ulsan National Institute of Science & Technology, Ulsan 689-805, Korea
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