51
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Ran F, Lei W, Cui Y, Jiao J, Mao Y, Wang S, Wang S. Size effect on oral absorption in polymer-functionalized mesoporous carbon nanoparticles. J Colloid Interface Sci 2017; 511:57-66. [PMID: 28972896 DOI: 10.1016/j.jcis.2017.09.088] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Revised: 09/22/2017] [Accepted: 09/22/2017] [Indexed: 02/01/2023]
Abstract
In this manuscript, the effect of the particle size of polymer-functionalized mesoporous carbon (MPP) nanoparticles on enhancing oral absorption of a water-insoluble drug is first investigated. The insoluble drug, fenofibrate (Fen), was selected as the model drug loaded in the MPP nanoparticles. MPP nanoparticles with different particle sizes were designed for improving the oral bioavailability of drugs, in which the branched polyethyleneimine (PEI) and polyacrylic acid (PAA) were modified on the surfaces of mesoporous carbon nanoparticles (MCNs) with amide bonds. In addition, PEI-functionalized carbon quantum dots (PCA) and radioisotope 125I were applied to label the MPP nanoparticles to trace in the vivo process. According to the data, the MPP nanoparticles could markedly improve the dissolution rate and oral bioavailability of Fen. Interestingly, the MPP nanoparticle size had a notable effect on Fen oral absorption, and intermediate sized MPP nanoparticles were expected to be more ideal oral drug carriers. The nanoparticles were safe and easily excreted. These findings present the prospect of MPP nanoparticles for oral application, and guides the rational design of an oral delivery system with respect to particle size.
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Affiliation(s)
- Fu Ran
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, PR China
| | - Wei Lei
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, PR China
| | - Yu Cui
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, PR China
| | - Jian Jiao
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, PR China
| | - Yuling Mao
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, PR China
| | - Shengyu Wang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, PR China
| | - Siling Wang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, PR China.
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53
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Aptamer-based zearalenone assay based on the use of a fluorescein label and a functional graphene oxide as a quencher. Mikrochim Acta 2017. [DOI: 10.1007/s00604-017-2487-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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54
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Tian J, Wei W, Wang J, Ji S, Chen G, Lu J. Fluorescence resonance energy transfer aptasensor between nanoceria and graphene quantum dots for the determination of ochratoxin A. Anal Chim Acta 2017; 1000:265-272. [PMID: 29289319 DOI: 10.1016/j.aca.2017.08.018] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 08/11/2017] [Accepted: 08/14/2017] [Indexed: 10/19/2022]
Abstract
In the present work, colloidal cerium oxide nanoparticles (nanoceria) and graphene quantum dots (GQDs) were firstly synthesized by sol-gel method and pyrolysis respectively, which all have a uniform nano-size and significant fluorescence emission. Due to the fluorescence emission spectrum of nanoceria overlapped the absorption spectrum of GQDs, fluorescence resonance energy transfer (FRET) between nanoceria and GQDs could occur effectively by the electrostatic interaction. Based on it, a sensitive ratiometric fluorescence aptasensor for the determination of ochratoxin A (OTA), a small molecular mycotoxin produced by Aspergillus and Penicillium strains, has been successfully constructed. In which, probe DNA1@nanoceria and DNA2@GQD were designed to complementary with OTA aptamer, both could adsorb each other, leading to the occur of FRET. After adding of OTA aptamer and then introducing of OTA, the FRET would be interrupted/recovered due to the specific affinity of OTA and its aptamer, the fluorescence recovery value would increase with the addition of OTA. Under the optimal experimental conditions (pH 7, mGQD/nanoceria 2, captamer 100 nM, incubation time 30 min), the constructed ratiometric fluorescence aptasensor exhibited a satisfying linear range (0.01-20 ng mL-1), low limit of detection (2.5 pg mL-1) and good selectivity towards OTA, and has been successfully applied for the analysis of real sample peanuts with good accuracy of the recoveries ranged from 90 to 110%.
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Affiliation(s)
- Jiuying Tian
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, PR China
| | - Wenqi Wei
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, PR China
| | - Jiawen Wang
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, PR China
| | - Saijie Ji
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, PR China
| | - Guichan Chen
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, PR China
| | - Jusheng Lu
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, PR China.
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55
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Seraj S, Rouhani S. A Fluorescence Quenching Study of Naphthalimide Dye by Graphene: Mechanism and Thermodynamic Properties. J Fluoresc 2017; 27:1877-1883. [DOI: 10.1007/s10895-017-2126-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Accepted: 06/13/2017] [Indexed: 11/24/2022]
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56
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Gupta S, Wood R. Development of FRET biosensor based on aptamer/functionalized graphene for ultrasensitive detection of bisphenol A and discrimination from analogs. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.nanoso.2017.03.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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57
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Fluorescent sensor assay for β-lactamase in milk based on a combination of aptamer and graphene oxide. Food Control 2017. [DOI: 10.1016/j.foodcont.2016.09.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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58
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Highly selective colorimetric and electrochemical sensing of iron (III) using Nile red functionalized graphene film. Biosens Bioelectron 2017; 89:430-436. [DOI: 10.1016/j.bios.2016.04.073] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Revised: 04/19/2016] [Accepted: 04/21/2016] [Indexed: 12/30/2022]
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59
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Lv X, Zhang Y, Liu G, Du L, Wang S. Aptamer-based fluorescent detection of ochratoxin A by quenching of gold nanoparticles. RSC Adv 2017. [DOI: 10.1039/c7ra01474k] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
A simple, rapid, low cost and highly sensitive method for the detection of ochratoxin A (OTA) was developed based on the principle that dispersed AuNPs show a better fluorescence quenching effect than aggregated AuNPs.
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Affiliation(s)
- Xin Lv
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
| | - Yuanfu Zhang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
| | - Guofu Liu
- College of Life Science
- Liaocheng University
- Liaocheng 252059
- China
| | - Lingyun Du
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
| | - Shuhao Wang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
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60
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Wei M, Zhang W. A novel impedimetric aptasensor based on AuNPs–carboxylic porous carbon for the ultrasensitive detection of ochratoxin A. RSC Adv 2017. [DOI: 10.1039/c7ra04209d] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
A novel impedimetric aptasensor based on AuNPs–carboxylic porous carbon for the ultrasensitive detection of OTA.
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Affiliation(s)
- Min Wei
- College of Food Science and Technology
- Henan University of Technology
- Zhengzhou 450001
- PR China
| | - Wenyang Zhang
- College of Food Science and Technology
- Henan University of Technology
- Zhengzhou 450001
- PR China
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61
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Eissa S, Zourob M. In vitro selection of DNA aptamers targeting β-lactoglobulin and their integration in graphene-based biosensor for the detection of milk allergen. Biosens Bioelectron 2016; 91:169-174. [PMID: 28006685 DOI: 10.1016/j.bios.2016.12.020] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 12/04/2016] [Accepted: 12/08/2016] [Indexed: 01/02/2023]
Abstract
Food allergy has increased rapidly in recent years affecting millions of people worldwide. With the increased consumption of packed food nowadays, a sensitive, accurate and rapid screening method for potential food allergens has become an urgent need in order to protect the sensitive consumers from life-threatening reactions. The current detection methods for food allergens are mostly based on immunoassays which are costly and times-consuming. In this work, we developed an aptamer/graphene-based electrochemical biosensor for on-step, sensitive and low cost detection of β-lactoglobulin (β-LG) milk protein, one of the most common food allergens specially in infants. The selection of DNA aptamers against the two β-LG variants A and B was successfully realised using systemic evolution of ligands by exponential enrichment (SELEX) method. Among the selected aptamers, BLG14 aptamer sequence has shown high affinity and specificity to both β-LG A and B with dissociation constants (Kds) of 82 and 80nM, respectively as calculated using fluorescence binding assays. The aptamer was then integrated in a voltammetric biosensor utilizing graphene-modified screen printed carbon electrodes. The binding is monitored by following the change in the square wave voltammetry (SWV) reduction peak signal of ferrocyanide/ferricyanide redox couple due to the removal of the negatively charged aptamers from the surface upon protein binding. This one-step "signal on" biosensor takes 20min for the sensitive and selective detection of β-LG without using any labelling or sophisticated designs. The method was also tested in spiked food sample extract achieving good recovery percentage. The integration of the novel aptamer in the graphene biosensor allows a promising way for cost-effective, rapid and sensitive on-site detection of milk allergen in food stuff.
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Affiliation(s)
- Shimaa Eissa
- Department of Chemistry, Alfaisal University, Al Zahrawi Street, Al Maather, Al Takhassusi Road, Riyadh 11533, Saudi Arabia
| | - Mohammed Zourob
- Department of Chemistry, Alfaisal University, Al Zahrawi Street, Al Maather, Al Takhassusi Road, Riyadh 11533, Saudi Arabia; King Faisal Specialist Hospital and Research Center, Zahrawi Street, Al Maather, Riyadh 12713, Saudi Arabia.
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62
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Zhao Y, Li K, He Z, Zhang Y, Zhao Y, Zhang H, Miao Z. Investigation on Fluorescence Quenching Mechanism of Perylene Diimide Dyes by Graphene Oxide. Molecules 2016; 21:molecules21121642. [PMID: 27916897 PMCID: PMC6272842 DOI: 10.3390/molecules21121642] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 11/21/2016] [Accepted: 11/23/2016] [Indexed: 11/16/2022] Open
Abstract
Perylene diimide derivatives were used as probes to investigate the effect of the molecular structures on the fluorescence quenching mechanism in a perylene diimide/graphene oxide system. The electrons transferred from the excited state of dyes to the conductive band of graphene oxide with different concentrations were determined by fluorescence spectra. The results indicated that the quenching efficiency of perylene diimides by graphene oxide was not only dependent on the difference between the lowest unoccupied molecular orbital level of dyes and the conduction band of the graphene oxide, but also mainly on the difference in the molecular structures.
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Affiliation(s)
- Yuzhen Zhao
- Department of Applied Statistics and Sciences, Xijing University, Xi'an 710123, China.
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
| | - Kexuan Li
- Department of Applied Statistics and Sciences, Xijing University, Xi'an 710123, China.
| | - Zemin He
- State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.
| | - Yongming Zhang
- Department of Applied Statistics and Sciences, Xijing University, Xi'an 710123, China.
| | - Yang Zhao
- Department of Applied Statistics and Sciences, Xijing University, Xi'an 710123, China.
| | - Haiquan Zhang
- State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.
| | - Zongcheng Miao
- Department of Applied Statistics and Sciences, Xijing University, Xi'an 710123, China.
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63
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Zhao L, Zhao L, Yang S, Peng X, Wu J, Bian L, Wang X, Pu Q. Use of Pulsed Streaming Potential with a Prepared Cationic Polyelectrolyte Layer to Detect Deposition Kinetics of Graphene Oxide and Consequences of Particle Size Differences. Anal Chem 2016; 88:10437-10444. [PMID: 27696821 DOI: 10.1021/acs.analchem.6b02342] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The deposition kinetics of graphene oxide (GO) onto poly(ethylene imine) (PEI) layer was characterized in situ with pulsed streaming potential (SP) measurement, and it was found that the initial rate constant (ki) was dependent on the size of GO with same surface charge density at a fixed concentration under controlled experimental conditions. Assuming the deposition was controlled by diffusion at the initial stage, ki is proportional to Rh-2/3, where Rh is the hydrodynamic radius. By flushing a GO solution through a capillary coated with PEI, the initial change rate of relative SP (dEr/dt) was obtained in 20 s and ki was measured with five different concentrations in about 2 min. Three GO samples of different sizes obtained from the same batch of raw material were characterized with pulsed SP to get ki values, and their sizes were verified with atomic force microscopy and dynamic light scattering. The experimental results are consistent with the predicted effects of the size of NPs on their deposition kinetics.
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Affiliation(s)
- Lei Zhao
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University , Lanzhou, Gansu 730000, China
| | - Lizhi Zhao
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University , Lanzhou, Gansu 730000, China
| | - Shenghong Yang
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University , Lanzhou, Gansu 730000, China
| | - Xianglu Peng
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University , Lanzhou, Gansu 730000, China
| | - Jing Wu
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University , Lanzhou, Gansu 730000, China
| | - Lei Bian
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University , Lanzhou, Gansu 730000, China
| | - Xiayan Wang
- Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, Beijing University of Technology , Beijing 100124, China
| | - Qiaosheng Pu
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University , Lanzhou, Gansu 730000, China
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64
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Magneto-controlled aptasensor for simultaneous electrochemical detection of dual mycotoxins in maize using metal sulfide quantum dots coated silica as labels. Biosens Bioelectron 2016; 89:802-809. [PMID: 27816583 DOI: 10.1016/j.bios.2016.10.010] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 09/19/2016] [Accepted: 10/03/2016] [Indexed: 12/13/2022]
Abstract
Currently there is an urgent need for multi-mycotoxin detection methods due to the co-occurrence of multiple mycotoxins in food raw materials and their augmented toxicity. Herein, a magneto-controlled aptasensor has been developed for simultaneous electrochemical detection of ochratoxin A (OTA) and fumonisin B1 (FB1), two typical mycotoxins found in food crops world-wide. This aptasensor was designed using the high specificity between the target and aptamer with heavy CdTe or PbS quantum dots (QDs) coated silica as labels and the complementary DNA functionalized magnetic beads as capture probes. In presence of targets, the aptamer preferred to form the target-aptamer binding which forced the partial release of the preloaded labels from the magnetic beads. After a one-step incubation and a simple magnetic separation, the electrochemical signals of Cd2+ and Pb2+ dissolved from the reserved labels which had negative correlation with targets contents, was measured based on the difference of peak potentials. This aptasensor provided a wide detection range of 10pgmL-1 to 10ngmL-1 for OTA and 50pgmL-1 to 50ngmL-1 for FB1, and succeeded in real maize samples. This method provides a new avenue for high throughput screen of mycotoxins due to the advantages of simple instrument, low sample consumption, short assay times, and lower detection costs per assay. Moreover, it could be readily expanded for the simultaneous detection of a large panel of mycotoxins by using different metal sulfide QDs when their specific aptamers are available.
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65
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Facile synthesis of Fe 3O 4/g-C 3N 4/HKUST-1 composites as a novel biosensor platform for ochratoxin A. Biosens Bioelectron 2016; 92:718-723. [PMID: 27856163 DOI: 10.1016/j.bios.2016.10.006] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Revised: 09/27/2016] [Accepted: 10/01/2016] [Indexed: 01/08/2023]
Abstract
A fluorescent biosensor for ochratoxin A was fabricated on the basis of a new nanocomposite (Fe3O4/g-C3N4/HKUST-1 composites). Fe3O4/g-C3N4/HKUST-1 was synthesized in this work for the first time, which combined HKUST-1 with g-C3N4 to improve its chemical stability. Fe3O4/g-C3N4/HKUST-1 composites have strong adsorption capacity for dye-labeled aptamer and are able to completely quench the fluorescence of the dye through the photoinduced electron transfer (PET) mechanism. In the presence of ochratoxin A (OTA), it can bind with the aptamer with high affinity, causing the releasing of the dye-labeled aptamer from the Fe3O4/g-C3N4/HKUST-1 and therefore results in the recovery of fluorescence. The fluorescence intensity of the biosensor has a linear relationship with the OTA concentration in the range of 5.0-160.0ng/mL. The LOD of sensor is 2.57ng/mL (S/N=3). This fluorescence sensor based on the Fe3O4/g-C3N4/HKUST-1 composites has been applied to detect OTA in corn with satisfying results.
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66
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Mycotoxin Determination in Foods Using Advanced Sensors Based on Antibodies or Aptamers. Toxins (Basel) 2016; 8:toxins8080239. [PMID: 27529281 PMCID: PMC4999855 DOI: 10.3390/toxins8080239] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 07/08/2016] [Accepted: 07/08/2016] [Indexed: 12/24/2022] Open
Abstract
Mycotoxin contamination threatens health and life of humans and animals throughout the food supply chains. Many of the mycotoxins have been proven to be carcinogens, teratogens and mutagens. The reliable and sensitive sensing methods are requested to monitor mycotoxin contamination. Advanced sensors based on antibodies or aptamers boast the advantages of high sensitivity and rapidity, and have been used in the mycotoxin sensing. These sensors are miniaturized, thereby lowering costs, and are applicable to high-throughput modes. In this work, the latest developments in sensing strategies for mycotoxin determination were critically discussed. Optical and electrochemical sensing modes were compared. The sensing methods for single mycotoxin or multiple mycotoxins in food samples were reviewed, along with the challenges and the future of antibody or aptamer-based sensors. This work might promote academic studies and industrial applications for mycotoxin sensing.
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67
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Baruah U, Chowdhury D. Functionalized graphene oxide quantum dot-PVA hydrogel: a colorimetric sensor for Fe²⁺, Co²⁺ and Cu²⁺ ions. NANOTECHNOLOGY 2016; 27:145501. [PMID: 26902906 DOI: 10.1088/0957-4484/27/14/145501] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Functionalized graphene oxide quantum dots (GOQDs)-poly(vinyl alcohol) (PVA) hybrid hydrogels were prepared using a simple, facile and cost-effective strategy. GOQDs bearing different surface functional groups were introduced as the cross-linking agent into the PVA matrix thereby resulting in gelation. The four different types of hybrid hydrogels were prepared using graphene oxide, reduced graphene oxide, ester functionalized graphene oxide and amine functionalized GOQDs as cross-linking agents. It was observed that the hybrid hydrogel prepared with amine functionalized GOQDs was the most stable. The potential applicability of using this solid sensing platform has been subsequently explored in an easy, simple, effective and sensitive method for optical detection of M(2+) (Fe(2+), Co(2+) and Cu(2+)) in aqueous media involving colorimetric detection. Amine functionalized GOQDs-PVA hybrid hydrogel when put into the corresponding solution of Fe(2+), Co(2+) and Cu(2+) renders brown, orange and blue coloration respectively of the solution detecting the presence of Fe(2+), Co(2+) and Cu(2+) ions in the solution. The minimum detection limit observed was 1 × 10(-7) M using UV-visible spectroscopy. Further, the applicability of the sensing material was also tested for a mixture of co-existing ions in solution to demonstrate the practical applicability of the system. Insight into the probable mechanistic pathway involved in the detection process is also being discussed.
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Affiliation(s)
- Upama Baruah
- Material Nanochemistry Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Garchuk, Guwahati-781035, India
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68
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Catanante G, Mishra RK, Hayat A, Marty JL. Sensitive analytical performance of folding based biosensor using methylene blue tagged aptamers. Talanta 2016; 153:138-44. [PMID: 27130100 DOI: 10.1016/j.talanta.2016.03.004] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 02/26/2016] [Accepted: 03/02/2016] [Indexed: 11/18/2022]
Abstract
This work demonstrates the development of a folding based electrochemical aptasensor using methylene blue (MB) tagged anti-Ochratoxin A (OTA) aptamers. Different aptamer coupling strategies were tested using Hexamethylenediamine, polyethylene glycol, simple adsorption and diazonium coupling mechanism. The best sensitivity was recorded by oxidation of amines using hexamethylenediamine (HDMA) on screen printed carbon electrode (SPCE). To achieve the direct detection of OTA, aptamer conjugated redox probe was used and detection was demonstrated based on the conformational changes in aptamer structure upon OTA sensing. Signaling in this class of sensors arises from changes in electron transfer efficiency upon target-induced changes in the conformation/flexibility of the aptamer probe. These changes can be readily recorded electrochemically. The developed aptasensor is unique in its own mechanism as redox probe tagged aptamer coupling such as MB has never been tried to immobilize using long carbon chain spacers as, addition of spacers would provide more sensitive detection methods. A good dynamic range 0.01-5ng/ml was obtained for OTA with Limit of detection (LOD) 0.01ng/ml and Limit of quantification (LOQ) of 0.03ng/ml respectively. The good reproducibility was recorded with RSD% of 3.75. The obtained straight line equation was y=0.4035x+0.90311, r=0.9976. We believe that the sensor design guidelines outlined here represents a general strategy for developing new folding-based electrochemical aptasensors. The developed aptasensor was extended to screen cocoa samples for OTA contamination. The cocoa samples were extracted and purified using molecular imprinted polymer (MIP) columns. The aptasensor displayed good recovery values in the range 84-85% thus, exhibited the effectiveness of proposed aptasensor for such complex matrices.
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Affiliation(s)
- Gaëlle Catanante
- Laboratoire B.A.E., Université De Perpignan Via Domitia, 52 Avenue Paul Alduy, Perpignan Cedex 66860, France
| | - Rupesh K Mishra
- Laboratoire B.A.E., Université De Perpignan Via Domitia, 52 Avenue Paul Alduy, Perpignan Cedex 66860, France
| | - Akhtar Hayat
- Laboratoire B.A.E., Université De Perpignan Via Domitia, 52 Avenue Paul Alduy, Perpignan Cedex 66860, France; Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS Institute of Information Technology (CIIT), Lahore 54000, Pakistan
| | - Jean-Louis Marty
- Laboratoire B.A.E., Université De Perpignan Via Domitia, 52 Avenue Paul Alduy, Perpignan Cedex 66860, France
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69
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Chauhan R, Singh J, Sachdev T, Basu T, Malhotra BD. Recent advances in mycotoxins detection. Biosens Bioelectron 2016; 81:532-545. [PMID: 27019032 DOI: 10.1016/j.bios.2016.03.004] [Citation(s) in RCA: 176] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 02/25/2016] [Accepted: 03/03/2016] [Indexed: 01/01/2023]
Abstract
Mycotoxins contamination in both food and feed is inevitable. Mycotoxin toxicity in foodstuff can occur at very low concentrations necessitating early availability of sensitive and reliable methods for their detection. The present research thrust is towards the development of a user friendly biosensor for mycotoxin detection at both academic and industrial levels to replace conventional expensive chromatographic and ELISA techniques. This review critically analyzes the recent research trend towards the construction of immunosensor, aptasensor, enzymatic sensors and others for mycotoxin detection with a reference to label and label free methods, synthesis of new materials including nano dimension, and transuding techniques. Technological aspects in the development of biosensors for mycotoxin detection, current challenges and future prospects are also included to provide a overview and suggestions for future research directions.
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Affiliation(s)
- Ruchika Chauhan
- Amity Institute of Nanotechnology, Amity University Uttar Pradesh, Noida, India.
| | - Jay Singh
- Department of Applied Chemistry & Polymer Technology, Delhi Technological University, Delhi 110042, India.
| | - Tushar Sachdev
- Amity Institute of Nanotechnology, Amity University Uttar Pradesh, Noida, India.
| | - T Basu
- Amity Institute of Nanotechnology, Amity University Uttar Pradesh, Noida, India.
| | - B D Malhotra
- Department of Biotechnology, Delhi Technological University, Delhi, India.
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70
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Lv L, Cui C, Liang C, Quan W, Wang S, Guo Z. Aptamer-based single-walled carbon nanohorn sensors for ochratoxin A detection. Food Control 2016. [DOI: 10.1016/j.foodcont.2015.08.002] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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71
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Dou X, Chu X, Kong W, Luo J, Yang M. An indirect competitive fluorescence assay for ochratoxin A based on molecular beacon. RSC Adv 2016. [DOI: 10.1039/c5ra23966d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel, simple and efficient method based on molecular beacon probe was developed to detect ochratoxin A.
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Affiliation(s)
- Xiaowen Dou
- Institute of Medicinal Plant Development
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100193
- China
| | - Xianfeng Chu
- Institute of Medicinal Plant Development
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100193
- China
| | - Weijun Kong
- Institute of Medicinal Plant Development
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100193
- China
| | - Jiaoyang Luo
- Institute of Medicinal Plant Development
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100193
- China
| | - Meihua Yang
- Institute of Medicinal Plant Development
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100193
- China
- Hainan Branch Institute of Medicinal Plant Development
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72
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73
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Sharma A, Hayat A, Mishra RK, Catanante G, Shahid SA, Bhand S, Marty JL. Design of a fluorescence aptaswitch based on the aptamer modulated nano-surface impact on the fluorescence particles. RSC Adv 2016. [DOI: 10.1039/c6ra10942j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The concept of DNA based stabilization of nanostructures to enhance the surface reactivity has been the focus of great interest in the design of colorimetric aptaswitches.
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Affiliation(s)
- Atul Sharma
- BAE Laboratoire
- Université de Perpignan Via Domitia
- 66860 Perpignan 13 Cedex
- France
- Biosensor Lab
| | - Akhtar Hayat
- BAE Laboratoire
- Université de Perpignan Via Domitia
- 66860 Perpignan 13 Cedex
- France
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM)
| | - Rupesh Kumar Mishra
- BAE Laboratoire
- Université de Perpignan Via Domitia
- 66860 Perpignan 13 Cedex
- France
- Department of Biosciences and Biotechnology
| | - Gaëlle Catanante
- BAE Laboratoire
- Université de Perpignan Via Domitia
- 66860 Perpignan 13 Cedex
- France
| | | | - Sunil Bhand
- Biosensor Lab
- Department of Chemistry
- BITS, Pilani-K. K. Birla Goa Campus
- Goa
- India
| | - Jean Louis Marty
- BAE Laboratoire
- Université de Perpignan Via Domitia
- 66860 Perpignan 13 Cedex
- France
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74
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Aptamers as Synthetic Receptors for Food Quality and Safety Control. BIOSENSORS FOR SUSTAINABLE FOOD - NEW OPPORTUNITIES AND TECHNICAL CHALLENGES 2016. [DOI: 10.1016/bs.coac.2016.03.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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75
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Bülbül G, Hayat A, Andreescu S. Portable Nanoparticle-Based Sensors for Food Safety Assessment. SENSORS 2015; 15:30736-58. [PMID: 26690169 PMCID: PMC4721746 DOI: 10.3390/s151229826] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 11/26/2015] [Indexed: 12/11/2022]
Abstract
The use of nanotechnology-derived products in the development of sensors and analytical measurement methodologies has increased significantly over the past decade. Nano-based sensing approaches include the use of nanoparticles (NPs) and nanostructures to enhance sensitivity and selectivity, design new detection schemes, improve sample preparation and increase portability. This review summarizes recent advancements in the design and development of NP-based sensors for assessing food safety. The most common types of NPs used to fabricate sensors for detection of food contaminants are discussed. Selected examples of NP-based detection schemes with colorimetric and electrochemical detection are provided with focus on sensors for the detection of chemical and biological contaminants including pesticides, heavy metals, bacterial pathogens and natural toxins. Current trends in the development of low-cost portable NP-based technology for rapid assessment of food safety as well as challenges for practical implementation and future research directions are discussed.
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Affiliation(s)
- Gonca Bülbül
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, NY 13699-5810, USA.
| | - Akhtar Hayat
- Interdisciplinary Research Centre in Biomedical Materials, COMSAT Institute of Information Technology (CIIT), Defence Road, Off Raiwind Road, Lahore 54000, Pakistan.
| | - Silvana Andreescu
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, NY 13699-5810, USA.
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76
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Ha TH. Recent Advances for the Detection of Ochratoxin A. Toxins (Basel) 2015; 7:5276-300. [PMID: 26690216 PMCID: PMC4690132 DOI: 10.3390/toxins7124882] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 11/25/2015] [Accepted: 11/26/2015] [Indexed: 12/15/2022] Open
Abstract
Ochratoxin A (OTA) is one of the mycotoxins secreted by Aspersillus and Penicillium that can easily colonize various grains like coffee, peanut, rice, and maize. Since OTA is a chemically stable compound that can endure the physicochemical conditions of modern food processing, additional research efforts have been devoted to develop sensitive and cost-effective surveillance solutions. Although traditional chromatographic and immunoassays appear to be mature enough to attain sensitivity up to the regulation levels, alternative detection schemes are still being enthusiastically pursued in an attempt to meet the requirements of rapid and cost-effective detections. Herein, this review presents recent progresses in OTA detections with minimal instrumental usage, which have been facilitated by the development of OTA aptamers and by the innovations in functional nanomaterials. In addition to the introduction of aptamer-based OTA detection techniques, OTA-specific detection principles are also presented, which exclusively take advantage of the unique chemical structure and related physicochemical characteristics.
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Affiliation(s)
- Tai Hwan Ha
- BioNanotechnology Research Centre, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Korea.
- Nanobiotechnology (Major), Korea University of Science & Technology, 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Korea.
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77
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Zhang Z, Liu Y, Ji X, Xiang X, He Z. A graphene oxide-based enzyme-free signal amplification platform for homogeneous DNA detection. Analyst 2015; 139:4806-9. [PMID: 25058563 DOI: 10.1039/c4an00933a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A graphene oxide (GO) based enzyme-free signal amplification platform for homogeneous DNA sensing is developed with simplicity and high sensitivity. In the absence of the target DNA, labeled hairpin probe 1 (H1) and probe 2 (H2) were adsorbed on the surface of GO, resulting in the fluorescence quenching of the dyes and minimizing the background fluorescence. The addition of the target DNA facilitated the formation of double-stranded DNA (dsDNA) between H1 and H2, causing the probes to separate from GO and release the target DNA through a strand displacement reaction. Meanwhile, the whole reaction started anew. This is an excellent isothermal signal amplification technique without the involvement of enzymes. By monitoring the change of the fluorescence intensity, the target DNA not only can be determined in buffer solution, but also can be detected in 1% serum solution spiked with a series of concentrations of the target DNA. In addition, the consumption amount of the probes in this method is lower than that in traditional molecular beacon methods.
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Affiliation(s)
- Zhen Zhang
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China.
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Li MH, Wang YS, Cao JX, Chen SH, Tang X, Wang XF, Zhu YF, Huang YQ. Ultrasensitive detection of uranyl by graphene oxide-based background reduction and RCDzyme-based enzyme strand recycling signal amplification. Biosens Bioelectron 2015; 72:294-9. [DOI: 10.1016/j.bios.2015.05.032] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 05/02/2015] [Accepted: 05/12/2015] [Indexed: 11/15/2022]
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79
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Titanium Dioxide Nanoparticles (TiO₂) Quenching Based Aptasensing Platform: Application to Ochratoxin A Detection. Toxins (Basel) 2015; 7:3771-84. [PMID: 26402704 PMCID: PMC4591649 DOI: 10.3390/toxins7093771] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Revised: 09/15/2015] [Accepted: 09/16/2015] [Indexed: 12/17/2022] Open
Abstract
We demonstrate for the first time, the development of titanium dioxide nanoparticles (TiO2) quenching based aptasensing platform for detection of target molecules. TiO2 quench the fluorescence of FAM-labeled aptamer (fluorescein labeled aptamer) upon the non-covalent adsorption of fluorescent labeled aptamer on TiO2 surface. When OTA interacts with the aptamer, it induced aptamer G-quadruplex complex formation, weakens the interaction between FAM-labeled aptamer and TiO2, resulting in fluorescence recovery. As a proof of concept, an assay was employed for detection of Ochratoxin A (OTA). At optimized experimental condition, the obtained limit of detection (LOD) was 1.5 nM with a good linearity in the range 1.5 nM to 1.0 µM for OTA. The obtained results showed the high selectivity of assay towards OTA without interference to structurally similar analogue Ochratoxin B (OTB). The developed aptamer assay was evaluated for detection of OTA in beer sample and recoveries were recorded in the range from 94.30%–99.20%. Analytical figures of the merits of the developed aptasensing platform confirmed its applicability to real samples analysis. However, this is a generic aptasensing platform and can be extended for detection of other toxins or target analyte.
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80
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Aptameric Recognition-Modulated Electroactivity of Poly(4-Styrenesolfonic Acid)-Doped Polyaniline Films for Single-Shot Detection of Tetrodotoxin. SENSORS 2015; 15:22547-60. [PMID: 26370994 PMCID: PMC4610592 DOI: 10.3390/s150922547] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Accepted: 08/31/2015] [Indexed: 11/23/2022]
Abstract
The work being reported is the first electrochemical sensor for tetrodotoxin (TTX). It was developed on a glassy carbon electrodes (C) that was modified with poly(4-styrenesolfonic acid)-doped polyaniline film (PANI/PSSA). An amine-end functionalized TTX-binding aptamer, 5′-NH2-AAAAATTTCACACGGGTGCCTCGGCTGTCC-3′ (NH2-Apt), was grafted via covalent glutaraldehyde (glu) cross-linking. The resulting aptasensor (C//PANI+/PSSA-glu-NH2-Apt) was interrogated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in sodium acetate buffer (NaOAc, pH 4.8) before and after 30 min incubation in standard TTX solutions. Both CV and EIS results confirmed that the binding of the analyte to the immobilized aptamer modulated the electrochemical properties of the sensor: particularly the charge transfer resistance (Rct) of the PANI+/PSSA film, which served as a signal reporter. Based on the Rct calibration curve of the TTX aptasensor, the values of the dynamic linear range (DLR), sensitivity and limit of detection (LOD) of the sensor were determined to be 0.23–1.07 ng·mL−1 TTX, 134.88 ± 11.42 Ω·ng·mL−1 and 0.199 ng·mL−1, respectively. Further studies are being planned to improve the DLR as well as to evaluate selectivity and matrix effects in real samples.
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81
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Hayat A, Mishra RK, Catanante G, Marty JL. Development of an aptasensor based on a fluorescent particles-modified aptamer for ochratoxin A detection. Anal Bioanal Chem 2015; 407:7815-22. [PMID: 26277188 DOI: 10.1007/s00216-015-8952-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Revised: 07/29/2015] [Accepted: 07/31/2015] [Indexed: 11/28/2022]
Abstract
The presented work reports a generic fluorescent aptasensing design employing carboxy-modified fluorescent particles as a signal-generating probe and magnetic particles as a solid separation support. Carboxy-modified fluorescent particles were used to modify the aptamer and act as a signal-generating probe. Magnetic beads were used as an immobilization surface to perform the function of a solid separation support. As a proof of concept, the assay was used to detect ochratoxin A (OTA). Fluorescent detection based on the displacement and competition format was performed, and the obtained results were compared. The competition-based assays were characterized with improved analytical characteristics as compared to those based on the displacement principle. The competitive fluorescent assays showed a high sensitivity where the detection limit and IC50 were 0.005 and 7.2 nM respectively. The aptasensing platform was finally demonstrated for the detection of OTA in a beer sample. However, this is a generic approach that can be very easily extended to other matrixes to determine OTA. Additionally, the proposed concept of fluorescent particles as a signal-generating probe in combination with magnetic particles can also be integrated to other fluorescent-based affinity assays.
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Affiliation(s)
- Akhtar Hayat
- BAE: Biocapteurs-Analyses-Environnement, Universite de Perpignan Via Domitia, 52 Avenue Paul Alduy, Perpignan Cedex, 66860, France. .,Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS Institute of Information Technology, Lahore, 54000, Pakistan.
| | - Rupesh K Mishra
- BAE: Biocapteurs-Analyses-Environnement, Universite de Perpignan Via Domitia, 52 Avenue Paul Alduy, Perpignan Cedex, 66860, France
| | - Gaelle Catanante
- BAE: Biocapteurs-Analyses-Environnement, Universite de Perpignan Via Domitia, 52 Avenue Paul Alduy, Perpignan Cedex, 66860, France
| | - Jean Louis Marty
- BAE: Biocapteurs-Analyses-Environnement, Universite de Perpignan Via Domitia, 52 Avenue Paul Alduy, Perpignan Cedex, 66860, France
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82
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Sharma R, Ragavan KV, Thakur MS, Raghavarao KSMS. Recent advances in nanoparticle based aptasensors for food contaminants. Biosens Bioelectron 2015; 74:612-27. [PMID: 26190473 DOI: 10.1016/j.bios.2015.07.017] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 07/06/2015] [Accepted: 07/10/2015] [Indexed: 12/11/2022]
Abstract
Food safety and hazard analysis is a prime concern of human life, thus quality assessment of food and water is the need of the day. Recent advances in nano-biotechnology play a significant role in providing possible solutions for developing highly sensitive and affordable detection tools for food analysis. Nanomaterials based aptasensors hold great potential to overcome the drawbacks of conventional analytical techniques. Aptamers comprise a novel class of highly specific bio-recognition elements which are produced by SELEX (systematic evolution of ligands by exponential enrichment) process. They bind to target molecules by folding into 3D structures that can discriminate different chiral compounds. The flexibility in making modifications in aptamers contribute to the design of biosensors, enabling the generation of bio-recognition elements for a wide variety of target molecules. Nanomaterials such as metal nanoparticles, metal nanoclusters, metal oxide nanoparticles, metal and carbon quantum dots, graphene, carbon nanotubes and nanocomposites enable higher sensitivity by signal amplification and introduce several novel transduction principles such as enhanced chemiluminescence, fluorescence, Raman signals, electrochemical signals, enhanced catalytic activity, and super-paramagnetic properties to the biosensor. Although there are a few reviews published recently which deal with the potential of aptamers in various fields, none are devoted exclusively to the potential of aptasensors based on nanomaterials for the analysis of food contaminants. Hence, the current review discusses several transduction systems and their principles used in aptamer based nanosensors which have been developed in the past five years, the challenges faced in their designing, along with their strengths and limitations.
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Affiliation(s)
- Richa Sharma
- Department of Food Engineering, CSIR-CFTRI, India; Academy of Scientific and Innovative Research, India
| | - K V Ragavan
- Department of Food Engineering, CSIR-CFTRI, India; Academy of Scientific and Innovative Research, India
| | - M S Thakur
- Materials Science Centre, University of Mysore, Mysore 570005, Karnataka, India.
| | - K S M S Raghavarao
- Department of Food Engineering, CSIR-CFTRI, India; Academy of Scientific and Innovative Research, India.
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83
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Single-Stranded DNA Aptamers against Pathogens and Toxins: Identification and Biosensing Applications. BIOMED RESEARCH INTERNATIONAL 2015. [PMID: 26199940 PMCID: PMC4493287 DOI: 10.1155/2015/419318] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Molecular recognition elements (MREs) can be short sequences of single-stranded DNA, RNA, small peptides, or antibody fragments. They can bind to user-defined targets with high affinity and specificity. There has been an increasing interest in the identification and application of nucleic acid molecular recognition elements, commonly known as aptamers, since they were first described in 1990 by the Gold and Szostak laboratories. A large number of target specific nucleic acids MREs and their applications are currently in the literature. This review first describes the general methodologies used in identifying single-stranded DNA (ssDNA) aptamers. It then summarizes advancements in the identification and biosensing application of ssDNA aptamers specific for bacteria, viruses, their associated molecules, and selected chemical toxins. Lastly, an overview of the basic principles of ssDNA aptamer-based biosensors is discussed.
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84
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Lu L, Wang M, Liu LJ, Leung CH, Ma DL. Label-Free Luminescent Switch-On Probe for Ochratoxin A Detection Using a G-Quadruplex-Selective Iridium(III) Complex. ACS APPLIED MATERIALS & INTERFACES 2015; 7:8313-8318. [PMID: 25836665 DOI: 10.1021/acsami.5b01702] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A library of six luminescent Ir(III) complexes were synthesized and studied for their capacity to function as probes for G-quadruplex DNA. The novel Ir(III) complex 1 was discovered to be selective for G-quadruplex structures and was subsequently used for the construction of a label-free G-quadruplex-based ochratoxin A (OTA) sensing platform in aqueous solution. The assay exhibited linearity for OTA in the range of 0 to 60 nM (R2=0.9933), and the limit of detection for OTA was 5 nM. Furthermore, this assay was highly selective for OTA over its structurally related analogues.
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Affiliation(s)
- Lihua Lu
- †Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
| | - Modi Wang
- †Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
| | - Li-Juan Liu
- ‡State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao, China
| | - Chung-Hang Leung
- ‡State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao, China
| | - Dik-Lung Ma
- †Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
- §Partner State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong, China
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85
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Sharma TK, Ramanathan R, Rakwal R, Agrawal GK, Bansal V. Moving forward in plant food safety and security through NanoBioSensors: Adopt or adapt biomedical technologies? Proteomics 2015; 15:1680-92. [PMID: 25727733 DOI: 10.1002/pmic.201400503] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 01/11/2015] [Accepted: 02/23/2015] [Indexed: 11/07/2022]
Abstract
Plant-based foods are integral part of our day-to-day diet. Increasing world population has put forth an ever increasing demand for plant-based foods, and food security remains a major concern. Similarly, biological, chemical, and physical threats to our food and increasing regulatory demands to control the presence of foreign species in food products have made food safety a growing issue. Nanotechnology has already established its roots in diverse disciplines. However, the food industry is yet to harness the full potential of the unique capabilities offered by this next-generation technology. While there might be safety concerns in regards to integration of nanoproducts with our food products, an aspect of nanotechnology that can make remarkable contribution to different elements of the food chain is the use of nanobiosensors and diagnostic platforms for monitoring food traceability, quality, safety, and nutritional value. This brings us to an important question that whether existing diagnostic platforms that have already been well developed for biomedical and clinical application are suitable for food industry or whether the demands of the food industry are altogether different that may not allow adoption/adaptation of the existing technology. This review is an effort to raise this important "uncomfortable" yet "timely" question.
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Affiliation(s)
- Tarun K Sharma
- Centre for Biodesign and Diagnostics, Translational Health Science and Technology Institute, Gurgaon, Haryana, India
| | - Rajesh Ramanathan
- Ian Potter NanoBioSensing Facility, NanoBiotechnology Research Laboratory (NBRL), School of Applied Sciences, RMIT University, Melbourne, Victoria, Australia
| | - Randeep Rakwal
- Organization for Educational Initiatives, University of Tsukuba, Tsukuba, Ibaraki, Japan
- Department of Anatomy I, School of Medicine, Showa University, Shinagawa, Tokyo, Japan
- Research Laboratory for Biotechnology and Biochemistry (RLABB), Kathmandu, Nepal
- GRADE Academy Private Limited, Birgunj, Nepal
| | - Ganesh K Agrawal
- Research Laboratory for Biotechnology and Biochemistry (RLABB), Kathmandu, Nepal
- GRADE Academy Private Limited, Birgunj, Nepal
| | - Vipul Bansal
- Ian Potter NanoBioSensing Facility, NanoBiotechnology Research Laboratory (NBRL), School of Applied Sciences, RMIT University, Melbourne, Victoria, Australia
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86
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Shi ZY, Zheng YT, Zhang HB, He CH, Wu WD, Zhang HB. DNA Electrochemical Aptasensor for Detecting Fumonisins B1Based on Graphene and Thionine Nanocomposite. ELECTROANAL 2015. [DOI: 10.1002/elan.201400504] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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87
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Malhotra BD, Srivastava S, Augustine S. Biosensors for Food Toxin Detection: Carbon Nanotubes and Graphene. ACTA ACUST UNITED AC 2015. [DOI: 10.1557/opl.2015.165] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTThere is increased interest towards the application of carbon based nanomaterials to biosensors since these can be used to quickly detect presence of the toxins in food, agricultural and environmental systems. The accurate, faster and early detection of food toxins is presently very important for ensuring safety and shelf life of agricultural commodities resulting from food contamination. The carbon materials (CNTs) and recently discovered graphene have been predicted to be promising candidates in the development of electrochemical biosensor owing to their exceptionally large surface area and interesting electrochemical properties. We focus on some of the recent results obtained in our laboratories pertaining to the development of biosensors based on multi-walled carbon nanotubes and graphene for mycotoxin(aflatoxin ) detection.
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88
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Wang C, Qian J, Wang K, Wang K, Liu Q, Dong X, Wang C, Huang X. Magnetic-fluorescent-targeting multifunctional aptasensorfor highly sensitive and one-step rapid detection of ochratoxin A. Biosens Bioelectron 2015; 68:783-790. [PMID: 25682508 DOI: 10.1016/j.bios.2015.02.008] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 02/05/2015] [Accepted: 02/06/2015] [Indexed: 02/06/2023]
Abstract
A multifunctional aptasensor for highly sensitive and one-step rapid detection of ochratoxin A (OTA), has been developed using aptamer-conjugated magnetic beads (MBs) as the recognition and concentration element and a heavy CdTe quantum dots (QDs) as the label. Initially, the thiolated aptamer was conjugated on the Fe3O4@Au MBs through Au-S covalent binding. Subsequently, multiple CdTe QDs were loaded both in and on a versatile SiO2 nanocarrier to produce a large amplification factor of hybrid fluorescent nanoparticles (HFNPs) labeled complementary DNA (cDNA). The magnetic-fluorescent-targeting multifunctional aptasensor was thus fabricated by immobilizing the HFNPs onto MBs' surface through the hybrid reaction between the aptamer and cDNA. This aptasensor can be produced at large scale in a single run, and then can be conveniently used for rapid detection of OTA through a one-step incubation procedure. The presence of OTA would trigger aptamer-OTA binding, resulting in the partial release of the HFNPs into bulk solution. After a simple magnetic separation, the supernatant liquid of the above solution contained a great number of CdTe QDs produced an intense fluorescence emission. Under the optimal conditions, the fluorescence intensity of the released HFNPs was proportional to the concentration of OTA in a wide range of 15 pg mL(-1) -100 ng mL(-1) with a detection limit of 5.4 pg mL(-1) (S/N=3). This multifunctional aptasensor represents a promising path toward routine quality control of food safety, and also creates the opportunity to develop aptasensors for other targets using this strategy.
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Affiliation(s)
- Chengquan Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China; Changzhou College of Information Technology, Changzhou 213164, PR China
| | - Jing Qian
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Kan Wang
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Kun Wang
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
| | - Qian Liu
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Xiaoya Dong
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Chengke Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Xingyi Huang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China.
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89
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Zhang RZ, Pan BG, Wang HN, Dan JM, Hong CL, Li HL. Polydopamine and graphene oxide synergistically modified Prussian blue electrochemical immunosensor for the detection of alpha-fetoprotein with enhanced stability and sensibility. RSC Adv 2015. [DOI: 10.1039/c5ra04325e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
In this paper, a simple and highly sensitive amperometric immunosensor for the determination of alpha-fetoprotein based on multi-functional gold nanoparticles–polydopamine-Prussian blue–graphene oxide nanocomposites (Au–PDA-PB–GO) was fabricated.
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Affiliation(s)
- Ren-zhong Zhang
- College of Chemistry and Chemical Engineering
- Shihezi University
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi
- China
| | - Bo-guang Pan
- College of Chemistry and Chemical Engineering
- Shihezi University
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi
- China
| | - Hai-ning Wang
- College of Chemistry and Chemical Engineering
- Shihezi University
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi
- China
| | - Jian-ming Dan
- College of Chemistry and Chemical Engineering
- Shihezi University
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi
- China
| | - Cheng-lin Hong
- College of Chemistry and Chemical Engineering
- Shihezi University
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi
- China
| | - Hong-ling Li
- College of Chemistry and Chemical Engineering
- Shihezi University
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi
- China
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90
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Perreault F, Fonseca de Faria A, Elimelech M. Environmental applications of graphene-based nanomaterials. Chem Soc Rev 2015; 44:5861-96. [DOI: 10.1039/c5cs00021a] [Citation(s) in RCA: 1073] [Impact Index Per Article: 119.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A critical assessment of recent developments in environmental applications of graphene and graphene-based materials.
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Affiliation(s)
- François Perreault
- Department of Chemical and Environmental Engineering
- Yale University
- New Haven
- USA
| | | | - Menachem Elimelech
- Department of Chemical and Environmental Engineering
- Yale University
- New Haven
- USA
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91
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Ponnamma D, Guo Q, Krupa I, Al-Maadeed MASA, K. T. V, Thomas S, Sadasivuni KK. Graphene and graphitic derivative filled polymer composites as potential sensors. Phys Chem Chem Phys 2015; 17:3954-81. [DOI: 10.1039/c4cp04418e] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Graphite and numerous graphitic-derived micro- and nano-particles have gained importance in current materials science research.
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Affiliation(s)
- Deepalekshmi Ponnamma
- School of Chemical Sciences
- Mahatma Gandhi University
- Kottayam-686560
- India
- Institute for Frontier Materials
| | - Qipeng Guo
- Institute for Frontier Materials
- Deakin University
- Geelong
- Australia
| | - Igor Krupa
- Centre for Advanced Materials
- Qatar University
- Doha
- Qatar
| | | | - Varughese K. T.
- Polymer laboratory
- Dielectric Materials Division
- Central Power Research Institute
- Bangalore-560080
- India
| | - Sabu Thomas
- School of Chemical Sciences
- Mahatma Gandhi University
- Kottayam-686560
- India
- Centre for Nanoscience and Nanotechnology
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92
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Abstract
In this critical review, we present the recent advances in the design and fabrication of graphene/nucleic acid nanobiointerfaces, as well as the fundamental understanding of their interfacial properties and various nanobiotechnological applications.
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Affiliation(s)
- Longhua Tang
- State Key Laboratory of Modern Optical Instrumentation
- Department of Optical Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - Ying Wang
- Department of Chemistry
- Shanghai Key Laboratory of Chemical Assessment and Sustainability
- UNEP-Tongji Institute of Environment for Sustainable Development
- Tongji University
- Shanghai
| | - Jinghong Li
- Department of Chemistry
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation
- Tsinghua University
- Beijing 100084
- China
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93
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Song J, Lau PS, Liu M, Shuang S, Dong C, Li Y. A general strategy to create RNA aptamer sensors using "regulated" graphene oxide adsorption. ACS APPLIED MATERIALS & INTERFACES 2014; 6:21806-21812. [PMID: 24992732 DOI: 10.1021/am502138n] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Aptamers have been used as molecular recognition elements for sensor development in combination with graphene oxide (GO), a nanomaterial with properties including fluorescence quenching, and selective adsorption of single-stranded nucleic acids. However, previous sensor designs based on aptamer-GO adsorption have not demonstrated wide applicability, and few studies have explored the potential of RNA aptamers. Herein, we present a new sensing strategy based on "regulated" GO adsorption that can accommodate various RNA aptamers. First, adsorption of a fluorophore-labeled RNA aptamer to GO results in fluorescence quenching due to close proximity of the fluorophore to GO. The addition of a complementary, "blocking" DNA strand (BDNA) that hybridizes to the 3'-end of the aptamer, weakens aptamer-GO interaction, and enables increased fluorescent signal generation upon the addition of target, as the sensing system becomes completely separated from GO. Our findings can be applied toward different aptamers, and adapted to enhance generality of existing sensing applications.
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Affiliation(s)
- Jinping Song
- Department of Biochemistry and Biomedical Sciences, Department of Chemistry and Chemical Biology, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
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94
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Lamberti F, Brigo L, Favaro M, Luni C, Zoso A, Cattelan M, Agnoli S, Brusatin G, Granozzi G, Giomo M, Elvassore N. Optoelectrochemical biorecognition by optically transparent highly conductive graphene-modified fluorine-doped tin oxide substrates. ACS APPLIED MATERIALS & INTERFACES 2014; 6:22769-22777. [PMID: 25438087 DOI: 10.1021/am506941u] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Both optical and electrochemical graphene-based sensors have gone through rapid development, reaching high sensitivity at low cost and with fast response time. However, the complex validating biochemical operations, needed for their consistent use, currently limits their effective application. We propose an integration strategy for optoelectrochemical detection that overcomes previous limitations of these sensors used separately. We develop an optoelectrochemical sensor for aptamer-mediated protein detection based on few-layer graphene immobilization on selectively modified fluorine-doped tin oxide (FTO) substrates. Our results show that the electrochemical properties of graphene-modified FTO samples are suitable for complex biological detection due to the stability and inertness of the engineered electrodic interface. In addition, few-layer immobilization of graphene sheets through electrostatic linkage with an electrochemically grafted FTO surface allows obtaining an optically accessible and highly conductive platform. As a proof of concept, we used insulin as the target molecule to reveal in solution. Because of its transparency and low sampling volume (a few microliters), our sensing unit can be easily integrated in lab-on-a-chip cell culture systems for effectively monitoring subnanomolar concentrations of proteins relevant for biomedical applications.
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Affiliation(s)
- F Lamberti
- Department of Industrial Engineering, University of Padova , Via Marzolo 9, 35131 Padova, Italy
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95
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Huang RC, Chiu WJ, Li YJ, Huang CC. Detection of microRNA in tumor cells using exonuclease III and graphene oxide-regulated signal amplification. ACS APPLIED MATERIALS & INTERFACES 2014; 6:21780-21787. [PMID: 24730476 DOI: 10.1021/am500534g] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this study, we developed a label-free, ultrasensitive graphene oxide (GO)-based probe for the detection of oligonucleotides by laser desorption/ionization mass spectrometry (LDI-MS). On the basis of simple π-π stacking and electrostatic interactions between rhodamine 6G (R6G) and GO, we prepared the nanocomposite R6G-modified GO (R6G-GO). Signal intensities of R6G increased in mass spectra in the presence of single-stranded oligonucleotides under pulsed laser irradiation (355 nm) of R6G-GO. In addition, the signal intensity of R6G was stronger in the presence of short oligonucleotides. Because small oligonucleotides improve the LDI efficiency of R6G on GO, we designed an enzyme-amplified signal transduction probe system for the detection of microRNA (miRNA). After specific digestion of the probe DNA (pDNA) strand from pDNA/miRNA-hybridized complexes by exonuclease III (Exo III), the resulting small oligonucleotide fragments increased the R6G signal during LDI-MS of R6G-GO. In addition, the signal intensity of the R6G ions increased with increasing concentrations of the target miRNA. Coupling this enzyme reaction and R6G-GO with LDI-MS enabled the detection of miRNA at concentrations of the femtomolar (fM) level. We also demonstrated the analysis of miRNA in tumor cells and utilized this R6G-GO probe in the detection of a single-nucleotide polymorphism (SNP) in the Arg249Ser unit of the TP53 gene. This simple, rapid, and sensitive detection system based on the coupling of functional GO with LDI-MS appears to have great potential as a tool for the bioanalyses of oligonucleotides and proteins.
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Affiliation(s)
- Rong-Cing Huang
- Institute of Bioscience and Biotechnology and ‡Center of Excellence for the Oceans, National Taiwan Ocean University , Keelung 20224, Taiwan
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96
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Wang C, Dong X, Liu Q, Wang K. Label-free colorimetric aptasensor for sensitive detection of ochratoxin A utilizing hybridization chain reaction. Anal Chim Acta 2014; 860:83-8. [PMID: 25682251 DOI: 10.1016/j.aca.2014.12.031] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Revised: 12/14/2014] [Accepted: 12/15/2014] [Indexed: 11/25/2022]
Abstract
The combination of high selectivity of aptamer with the peroxidase-mimicking property of DNAzyme has presented considerable opportunities for designing colorimetric aptasensor for detection of ochratoxin A (OTA). The activities of both aptamer (as biorecognition element) and DNAzyme (as signal amplification element) are blocked via base pairing in the hairpin structure. Hybridization chain reaction (HCR) between two hairpin DNAs was employed to further improve the sensitivity of this method. The presence of OTA triggers the opening of the hairpin structure and the beginning of HCR, which results in the release of many DNAzyme, and generates enhanced colorimetric signals, which is correlated to the amounts of OTA with linear range between 0.01 to 0.32 nM, and the limit of detection is 0.01 nM under optimal conditions. OTA in yellow rice wine and wheat flour samples was also detected using this method. We demonstrate that a new colorimetric method for the detection of OTA has been established, which is simple, easy to conduct, label-free, sensitive, high throughput, and cost-saving.
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Affiliation(s)
- Chengke Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Xiaoya Dong
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Qian Liu
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Kun Wang
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
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97
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Sadeghi S, Fooladi E, Malekaneh M. A New Amperometric Benzaldhyde Biosensor Based on Aldehyde Oxidase Immobilized on Fe3O4-GrapheneOxide/Polyvinylpyrrolidone/Polyaniline Nanocomposite. ELECTROANAL 2014. [DOI: 10.1002/elan.201400420] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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98
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Zheng Z, Hu J, He Z. A split G-quadruplex and graphene oxide-based low-background platform for fluorescence authentication of Pseudostellaria heterophylla. SENSORS 2014; 14:22971-81. [PMID: 25479327 PMCID: PMC4299048 DOI: 10.3390/s141222971] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 11/09/2014] [Accepted: 11/27/2014] [Indexed: 11/25/2022]
Abstract
A label-free split G-quadruplex and graphene oxide (GO)-based fluorescence platform has been designed to distinguish Pseudostellaria heterophylla (PH) from its adulterants based on the differences in their nrDNA ITS sequences. Herein, GO has been first introduced to capture G-rich probes with 2:2 split mode and then decrease the background signal. As T-DNA exists, the probes leave the GO surface to form double-stranded structures followed by the formation of the overhanging G-rich sequence into a G-quadruplex structure, which combines quinaldine red specifically to produce a strong fluorescence signal. In addition, this strategy allows detection of T-DNA in a wide range of concentrations from 1.0 × 10−8 to 2.0 × 10−6 mol·L−1 with a detection limit of 7.8 × 10−9 mol·L−1. We hope that the split G-quadruplex/GO platform can be utilized to further develop gene identification sensors in Traditional Chinese Medicine or other analysis areas.
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Affiliation(s)
- Zhenzhu Zheng
- Institute of Drug Research, Fujian Academy of Traditional Chinese Medicine, Fuzhou 350003, China.
| | - Juan Hu
- Institute of Drug Research, Fujian Academy of Traditional Chinese Medicine, Fuzhou 350003, China.
| | - Zhaodong He
- Institute of Drug Research, Fujian Academy of Traditional Chinese Medicine, Fuzhou 350003, China.
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99
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Hung AH, Holbrook RJ, Rotz MW, Glasscock CJ, Mansukhani ND, MacRenaris KW, Manus LM, Duch MC, Dam KT, Hersam MC, Meade TJ. Graphene oxide enhances cellular delivery of hydrophilic small molecules by co-incubation. ACS NANO 2014; 8:10168-77. [PMID: 25226566 PMCID: PMC4212791 DOI: 10.1021/nn502986e] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 09/16/2014] [Indexed: 05/22/2023]
Abstract
The delivery of bioactive molecules into cells has broad applications in biology and medicine. Polymer-modified graphene oxide (GO) has recently emerged as a de facto noncovalent vehicle for hydrophobic drugs. Here, we investigate a different approach using native GO to deliver hydrophilic molecules by co-incubation in culture. GO adsorption and delivery were systematically studied with a library of 15 molecules synthesized with Gd(III) labels to enable quantitation. Amines were revealed to be a key chemical group for adsorption, while delivery was shown to be quantitatively predictable by molecular adsorption, GO sedimentation, and GO size. GO co-incubation was shown to enhance delivery by up to 13-fold and allowed for a 100-fold increase in molecular incubation concentration compared to the alternative of nanoconjugation. When tested in the application of Gd(III) cellular MRI, these advantages led to a nearly 10-fold improvement in sensitivity over the state-of-the-art. GO co-incubation is an effective method of cellular delivery that is easily adoptable by researchers across all fields.
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Affiliation(s)
- Andy H. Hung
- Department of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Robert J. Holbrook
- Department of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Matthew W. Rotz
- Department of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Cameron J. Glasscock
- Department of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Nikhita D. Mansukhani
- Department of Materials Science and Engineering and Department of Chemistry, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208-3108, United States
| | - Keith W. MacRenaris
- Department of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Lisa M. Manus
- Department of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Matthew C. Duch
- Department of Materials Science and Engineering and Department of Chemistry, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208-3108, United States
| | - Kevin T. Dam
- Department of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Mark C. Hersam
- Department of Materials Science and Engineering and Department of Chemistry, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208-3108, United States
- Address correspondence to ;
| | - Thomas J. Meade
- Department of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
- Address correspondence to ;
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100
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Wei Y, Zhang J, Wang X, Duan Y. Amplified fluorescent aptasensor through catalytic recycling for highly sensitive detection of ochratoxin A. Biosens Bioelectron 2014; 65:16-22. [PMID: 25461133 DOI: 10.1016/j.bios.2014.09.100] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 09/01/2014] [Accepted: 09/23/2014] [Indexed: 12/31/2022]
Abstract
This paper describes a novel approach utilizing nano-graphite-aptamer hybrid and DNase I for the amplified detection of ochratoxin A (OTA) for the first time. Nano-graphite can effectively quench the fluorescence of carboxyfluorescein (FAM) labeled OTA specific aptamer due to their strong π-π; stacking interactions; while upon OTA addition, it will bind with aptamer to fold into an OTA-aptamerG-quadruplex structure, which does not adsorb on the surface of nano-graphite and thus retains the dye fluorescence. Meanwhile, the G-quadruplex structure can be cleaved by DNase I, and in such case OTA is delivered from the complex. The released OTA then binds other FAM-labeled aptamers on the nano-graphite surface, and touches off another target recycling, resulting in the successive release of dye-labeled aptamers from the nano-graphite, which leads to significant amplification of the signal. Under the optimized conditions, the present amplified sensing system exhibits high sensitivity toward OTA with a limit of detection of 20nM (practical measurement), which is about 100-fold higher than that of traditional unamplified homogeneous assay. Our developed method also showed high selectivity against other interference molecules and can be applied for the detection of OTA in real red wine samples. The proposed assay is simple, cost-effective, and might open a door for the development of new assays for other biomolecules. This aptasensor is of great practical importance in food safety and could be widely extended to the detection of other toxins by replacing the sequence of the recognition aptamer.
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Affiliation(s)
- Yin Wei
- Research Center of Analytical Instrumentation, Analytical & Testing Center, Sichuan University, Chengdu, China
| | - Ji Zhang
- Research Center of Analytical Instrumentation, Analytical & Testing Center, Sichuan University, Chengdu, China
| | - Xu Wang
- Research Center of Analytical Instrumentation, Analytical & Testing Center, Sichuan University, Chengdu, China
| | - Yixiang Duan
- Research Center of Analytical Instrumentation, College of Life Science, Sichuan University, Chengdu, China.
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