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Apak R, Calokerinos A, Gorinstein S, Segundo MA, Hibbert DB, Gülçin İ, Demirci Çekiç S, Güçlü K, Özyürek M, Çelik SE, Magalhães LM, Arancibia-Avila P. Methods to evaluate the scavenging activity of antioxidants toward reactive oxygen and nitrogen species (IUPAC Technical Report). PURE APPL CHEM 2021. [DOI: 10.1515/pac-2020-0902] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Abstract
This project was aimed to identify the quenching chemistry of biologically important reactive oxygen and nitrogen species (ROS/RNS, including radicals), to show antioxidant action against reactive species through H‐atom and electron transfer reactions, and to evaluate the ROS/RNS scavenging activity of antioxidants with existing analytical methods while emphasizing the underlying chemical principles and advantages/disadvantages of these methods. In this report, we focused on the applications and impact of existing assays on potentiating future research and innovations to evolve better methods enabling a more comprehensive study of different aspects of antioxidants and to provide a vocabulary of terms related to antioxidants and scavengers for ROS/RNS. The main methods comprise the scavenging activity measurement of the hydroxyl radical (•OH), dioxide(•1–) (O2
•–: commonly known as the superoxide radical), dihydrogen dioxide (H2O2: commonly known as hydrogen peroxide), hydroxidochlorine (HOCl: commonly known as hypochlorous acid), dioxidooxidonitrate(1–) (ONOO−: commonly known as the peroxynitrite anion), and the peroxyl radical (ROO•). In spite of the diversity of methods, there is currently a great need to evaluate the scavenging activity of antioxidant compounds in vivo and in vitro. In addition, there are unsatisfactory methods frequently used, such as non-selective UV measurement of H2O2 scavenging, producing negative errors due to incomplete reaction of peroxide with flavonoids in the absence of transition metal ion catalysts. We also discussed the basic mechanisms of spectroscopic and electrochemical nanosensors for measuring ROS/RNS scavenging activity of antioxidants, together with leading trends and challenges and a wide range of applications. This project aids in the identification of reactive species and quantification of scavenging extents of antioxidants through various assays, makes the results comparable and more understandable, and brings a more rational basis to the evaluation of these assays and provides a critical evaluation of existing ROS/RNS scavenging assays to analytical, food chemical, and biomedical/clinical communities by emphasizing the need for developing more refined, rapid, simple, and low‐cost assays and thus opening the market for a wide range of analytical instruments, including reagent kits and sensors.
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Affiliation(s)
- Reşat Apak
- Department of Chemistry , Istanbul University-Cerrahpaşa, Faculty of Engineering , Avcılar, 34320 Istanbul , Turkey
| | - Antony Calokerinos
- Department of Chemistry , National and Kapodistrian University of Athens, School of Sciences , Panepistimiopolis, 15771 Athens , Greece
| | - Shela Gorinstein
- The Hebrew University, Hadassah Medical School, School of Pharmacy, The Institute for Drug Research , Jerusalem , Israel
| | - Marcela Alves Segundo
- Department of Chemical Sciences , LAQV, REQUIMTE, Faculty of Pharmacy, University of Porto , Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto , Portugal
| | - David Brynn Hibbert
- New South Wales University, School of Chemistry , Sydney , NSW 2052 , Australia
| | - İlhami Gülçin
- Department of Chemistry , Faculty of Science, Atatürk University , Erzurum , Turkey
| | - Sema Demirci Çekiç
- Department of Chemistry , Istanbul University-Cerrahpaşa, Faculty of Engineering , Avcılar, 34320 Istanbul , Turkey
| | - Kubilay Güçlü
- Department of Chemistry , Adnan Menderes University, Faculty of Arts and Sciences , Aydın , Turkey
| | - Mustafa Özyürek
- Department of Chemistry , Istanbul University-Cerrahpaşa, Faculty of Engineering , Avcılar, 34320 Istanbul , Turkey
| | - Saliha Esin Çelik
- Department of Chemistry , Istanbul University-Cerrahpaşa, Faculty of Engineering , Avcılar, 34320 Istanbul , Turkey
| | - Luís M. Magalhães
- Department of Chemical Sciences , LAQV, REQUIMTE, Faculty of Pharmacy, University of Porto , Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto , Portugal
| | - Patricia Arancibia-Avila
- Departamento de Ciencias Básicas , Laboratorio de Ecofisiología y Microalgas, Universidad del Bio-Bio , Chillán , Chile
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Nonenzymatic Hydrogen Peroxide Detection Using Surface-Enhanced Raman Scattering of Gold-Silver Core-Shell-Assembled Silica Nanostructures. NANOMATERIALS 2021; 11:nano11102748. [PMID: 34685187 PMCID: PMC8540490 DOI: 10.3390/nano11102748] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 10/13/2021] [Accepted: 10/14/2021] [Indexed: 11/23/2022]
Abstract
Hydrogen peroxide (H2O2) plays important roles in cellular signaling and in industry. Thus, the accurate detection of H2O2 is critical for its application. Unfortunately, the direct detection of H2O2 by surface-enhanced Raman spectroscopy (SERS) is not possible because of its low Raman cross section. Therefore, the detection of H2O2 via the presence of an intermediary such as 3,3,5,5-tetramethylbenzidine (TMB) has recently been developed. In this study, the peroxidase-mimicking activity of gold–silver core–shell-assembled silica nanostructures (SiO2@Au@Ag alloy NPs) in the presence of TMB was investigated using SERS for detecting H2O2. In the presence of H2O2, the SiO2@Au@Ag alloy catalyzed the conversion of TMB to oxidized TMB, which was absorbed onto the surface of the SiO2@Au@Ag alloy. The SERS characteristics of the alloy in the TMB–H2O2 mixture were investigated. The evaluation of the SERS band to determine the H2O2 level utilized the SERS intensity of oxidized TMB bands. Moreover, the optimal conditions for H2O2 detection using SiO2@Au@Ag alloy included incubating 20 µg/mL SiO2@Au@Ag alloy NPs with 0.8 mM TMB for 15 min and measuring the Raman signal at 400 µg/mL SiO2@Au@Ag alloy NPs.
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De Matteis V, Cascione M, Toma CC, Rinaldi R. Engineered Gold Nanoshells Killing Tumor Cells: New Perspectives. Curr Pharm Des 2020; 25:1477-1489. [PMID: 31258061 DOI: 10.2174/1381612825666190618155127] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 06/11/2019] [Indexed: 12/30/2022]
Abstract
The current strategies to treat different kinds of cancer are mainly based on chemotherapy, surgery and radiation therapy. Unfortunately, these approaches are not specific and rather invasive as well. In this scenario, metal nano-shells, in particular gold-based nanoshells, offer interesting perspectives in the effort to counteract tumor cells, due to their unique ability to tune Surface Plasmon Resonance in different light-absorbing ranges. In particular, the Visible and Near Infrared Regions of the electromagnetic spectrum are able to penetrate through tissues. In this way, the light absorbed by the gold nanoshell at a specific wavelength is converted into heat, inducing photothermal ablation in treated cancer cells. Furthermore, inert gold shells can be easily functionalized with different types of molecules in order to bind cellular targets in a selective manner. This review summarizes the current state-of-art of nanosystems embodying gold shells, regarding methods of synthesis, bio-conjugations, bio-distribution, imaging and photothermal effects (in vitro and in vivo), providing new insights for the development of multifunctional antitumor drugs.
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Affiliation(s)
- Valeria De Matteis
- Dipartimento di Matematica e Fisica "E. De Giorgi", Universita del Salento, Via Monteroni, 73100 Lecce, Italy
| | - Mariafrancesca Cascione
- Dipartimento di Scienze Biomediche e Oncologia Umana, Universita degli Studi di Bari "Aldo Moro", p.zza G. Cesare, c/o Policlinico, 70124 Bari, Italy
| | - Chiara C Toma
- Dipartimento di Matematica e Fisica "E. De Giorgi", Universita del Salento, Via Monteroni, 73100 Lecce, Italy
| | - Rosaria Rinaldi
- Dipartimento di Matematica e Fisica "E. De Giorgi", Universita del Salento, Via Monteroni, 73100 Lecce, Italy
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RETRACTED: A SERS-based lateral flow assay biosensor for quantitative and ultrasensitive detection of interleukin-6 in unprocessed whole blood. Biosens Bioelectron 2019; 141:111432. [DOI: 10.1016/j.bios.2019.111432] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 06/04/2019] [Accepted: 06/10/2019] [Indexed: 01/18/2023]
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Wang Y, Hou Y, Li H, Yang M, Zhao P, Sun B. RETRACTED ARTICLE: A SERS-based lateral flow assay for the stroke biomarker S100-β. Mikrochim Acta 2019; 186:548. [DOI: 10.1007/s00604-019-3634-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 06/24/2019] [Indexed: 11/29/2022]
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Sun L, Zhou H, Huang D, Wang T, Gao P, Sun Y, Zhou G, Hu J. Fluorometric determination of antioxidant capacity in human plasma by using upconversion nanoparticles and an inner filter effect mechanism. Mikrochim Acta 2019; 186:502. [DOI: 10.1007/s00604-019-3627-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 06/19/2019] [Indexed: 12/18/2022]
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Takagi S, Nishi N, Sakka T. Ionic Liquid-in-Water Emulsion-templated Synthesis of Gold Nanoshells at the Liquid-Liquid Interface between Water and Primary Ammonium-based Ionic Liquids. CHEM LETT 2019. [DOI: 10.1246/cl.190146] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Seiji Takagi
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Naoya Nishi
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tetsuo Sakka
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
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Liu K, Liu H, Fan Q, Zhang S, Liu Z, Han L, Li H, Gao C. Solid-to-Hollow Conversion of Silver Nanocrystals by Surface-Protected Etching. Chemistry 2018; 24:19038-19044. [PMID: 30260045 DOI: 10.1002/chem.201804282] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Indexed: 12/22/2022]
Abstract
Although hollow silver nanocrystals possess unique plasmonic properties, there is a lack of robust strategies to synthesize such nanocrystals with high efficiency and controllability. To solve this problem, a new surface-protected etching strategy to convert solid Ag nanocrystals, which are widely available from conventional syntheses, into their hollow counterparts, producing a family of hollow Ag nanocrystals is reported. Hollow Ag nanospheres and nanotubes were prepared conveniently in this way. The key was the surface modification of Ag nanocrystals by a minor amount of Pt prior to a controllable etching process, which accounts for enhanced stability of the Ag surface and subsequent etching of Ag from the inner part of the nanocrystals while retaining the overall crystal morphology. These hollow Ag nanocrystals showed distinctive optical properties, as demonstrated by the enhanced optical transmittance of flexible electrodes fabricated with Ag nanotubes, compared to nanowires. These hollow Ag nanocrystals hold promise in different plasmonic and electronic applications.
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Affiliation(s)
- Kai Liu
- Frontier Institute of Science and Technology and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710054, P. R. China
| | - Hongpo Liu
- Frontier Institute of Science and Technology and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710054, P. R. China
| | - Qikui Fan
- Frontier Institute of Science and Technology and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710054, P. R. China
| | - Shumeng Zhang
- Frontier Institute of Science and Technology and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710054, P. R. China
| | - Zhaojun Liu
- Frontier Institute of Science and Technology and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710054, P. R. China
| | - Lu Han
- School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, P. R. China
| | - Houshen Li
- Frontier Institute of Science and Technology and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710054, P. R. China.,College of Chemistry and Material Science, Shandong Agricultural University, Taian, Shandong, 271018, P. R. China
| | - Chuanbo Gao
- Frontier Institute of Science and Technology and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710054, P. R. China
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Du S, Yu C, Tang L, Lu L. Applications of SERS in the Detection of Stress-Related Substances. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E757. [PMID: 30257510 PMCID: PMC6215319 DOI: 10.3390/nano8100757] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 09/12/2018] [Accepted: 09/23/2018] [Indexed: 11/16/2022]
Abstract
A wide variety of biotic and abiotic stresses continually attack plants and animals, which adversely affect their growth, development, reproduction, and yield realization. To survive under stress conditions, highly sophisticated and efficient tolerance mechanisms have been evolved to adapt to stresses, which consist of the variation of effector molecules playing vital roles in physiological regulation. The development of a sensitive, facile, and rapid analytical methods for stress factors and effector molecules detection is significant for gaining deeper insight into the tolerance mechanisms. As a nondestructive analysis technique, surface-enhanced Raman spectroscopy (SERS) has unique advantages regarding its biosensing applications. It not only provides specific fingerprint spectra of the target molecules, conformation, and structure, but also has universal capacity for simultaneous detection and imaging of targets owing to the narrow width of the Raman vibrational bands. Herein, recent progress on biotic and abiotic stresses, tolerance mechanisms and effector molecules is summarized. Moreover, the development and promising future trends of SERS detection for stress-related substances combined with nanomaterials as substrates and SERS tags are discussed. This comprehensive and critical review might shed light on a new perspective for SERS applications.
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Affiliation(s)
- Shuyuan Du
- Shandong Provincial Key Laboratory of Animal Resistance Biology, Institute of Biomedical Sciences, Key Laboratory of Food Nutrition and Safety of Shandong Normal University, College of Life Science, Shandong Normal University, Jinan 250014, China.
| | - Chundi Yu
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, China.
| | - Lin Tang
- Shandong Provincial Key Laboratory of Animal Resistance Biology, Institute of Biomedical Sciences, Key Laboratory of Food Nutrition and Safety of Shandong Normal University, College of Life Science, Shandong Normal University, Jinan 250014, China.
| | - Lixia Lu
- Shandong Provincial Key Laboratory of Animal Resistance Biology, Institute of Biomedical Sciences, Key Laboratory of Food Nutrition and Safety of Shandong Normal University, College of Life Science, Shandong Normal University, Jinan 250014, China.
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Emerging technologies for optical spectral detection of reactive oxygen species. Anal Bioanal Chem 2018; 410:6079-6095. [DOI: 10.1007/s00216-018-1233-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 06/12/2018] [Accepted: 06/28/2018] [Indexed: 12/15/2022]
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Pang J, Zhao Y, Liu HL, Wang K. A single nanoparticle-based real-time monitoring of biocatalytic progress and detection of hydrogen peroxide. Talanta 2018; 185:581-585. [PMID: 29759244 DOI: 10.1016/j.talanta.2018.04.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 04/02/2018] [Accepted: 04/07/2018] [Indexed: 11/19/2022]
Abstract
This paper reported a new method to observe the catalytic progress of the natural horseradish peroxidase (HRP) in-situ on single gold nanoparticles (GNPs) by the combination of dark field imaging and plasmonic resonance scattering spectra. The produced single HRP-GNP exhibited localized catalytic property toward H2O2-Diaminobenzidine (DAB), which could be used to detect the concentration of H2O2 in micro/nanospace. The linear range for H2O2 sensing was from 0.01 μM to 5 μM with a detection limit of 10 nM. The new design strategy could be applied for a broader bioanalysis situation by substituting the HRP with other specified biocatalyst.
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Affiliation(s)
- Jie Pang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210023, PR China.
| | - Yun Zhao
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210023, PR China
| | - Hai-Ling Liu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210023, PR China
| | - Kang Wang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210023, PR China.
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Apak R, Demirci Çekiç S, Üzer A, Çelik SE, Bener M, Bekdeşer B, Can Z, Sağlam Ş, Önem AN, Erçağ E. Novel Spectroscopic and Electrochemical Sensors and Nanoprobes for the Characterization of Food and Biological Antioxidants. SENSORS (BASEL, SWITZERLAND) 2018; 18:E186. [PMID: 29324685 PMCID: PMC5796370 DOI: 10.3390/s18010186] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 12/25/2017] [Accepted: 01/03/2018] [Indexed: 02/01/2023]
Abstract
Since an unbalanced excess of reactive oxygen/nitrogen species (ROS/RNS) causes various diseases, determination of antioxidants that can counter oxidative stress is important in food and biological analyses. Optical/electrochemical nanosensors have attracted attention in antioxidant activity (AOA) assessment because of their increased sensitivity and selectivity. Optical sensors offer advantages such as low cost, flexibility, remote control, speed, miniaturization and on-site/in situ analysis. Electrochemical sensors using noble metal nanoparticles on modified electrodes better catalyze bioelectrochemical reactions. We summarize the design principles of colorimetric sensors and nanoprobes for food antioxidants (including electron-transfer based and ROS/RNS scavenging assays) and important milestones contributed by our laboratory. We present novel sensors and nanoprobes together with their mechanisms and analytical performances. Our colorimetric sensors for AOA measurement made use of cupric-neocuproine and ferric-phenanthroline complexes immobilized on a Nafion membrane. We recently designed an optical oxidant/antioxidant sensor using N,N-dimethyl-p-phenylene diamine (DMPD) as probe, from which ROS produced colored DMPD-quinone cationic radicals electrostatically retained on a Nafion membrane. The attenuation of initial color by antioxidants enabled indirect AOA estimation. The surface plasmon resonance absorption of silver nanoparticles as a result of enlargement of citrate-reduced seed particles by antioxidant addition enabled a linear response of AOA. We determined biothiols with Ellman reagent-derivatized gold nanoparticles.
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Affiliation(s)
- Reşat Apak
- Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
- Turkish Academy of Sciences (TUBA), Piyade Sok., No. 27, Cankaya, 06550 Ankara, Turkey.
| | - Sema Demirci Çekiç
- Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
| | - Ayşem Üzer
- Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
| | - Saliha Esin Çelik
- Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
| | - Mustafa Bener
- Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
| | - Burcu Bekdeşer
- Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
| | - Ziya Can
- Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
| | - Şener Sağlam
- Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
| | - Ayşe Nur Önem
- Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
| | - Erol Erçağ
- Aytar Cad., Fecri Ebcioglu Sok., No. 6/8, Levent, 34340 Istanbul, Turkey.
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Sharma SK, Kumar P, Barthwal S, Sharma S, Sharma A. Highly Sensitive Surface-Enhanced Raman Scattering (SERS)- Based Multi Gas Sensor : Au Nanoparticles Decorated on Partially Embedded 2D Colloidal Crystals into Elastomer. ChemistrySelect 2017. [DOI: 10.1002/slct.201701204] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Satinder K. Sharma
- Department of Chemical Engineering (CHE) & DST Unit on Nano Sciences; Indian Institute of Technology (IIT)-Kanpur; Kanpur, Uttar Pradesh 208016 India
- School of Computing and Electrical Engineering; Indian Institute of Technology (IIT)-Mandi; Mandi, Himachal Pradesh 175001 India
| | - Pawan Kumar
- School of Computing and Electrical Engineering; Indian Institute of Technology (IIT)-Mandi; Mandi, Himachal Pradesh 175001 India
| | - Sumit Barthwal
- Department of Chemical Engineering (CHE) & DST Unit on Nano Sciences; Indian Institute of Technology (IIT)-Kanpur; Kanpur, Uttar Pradesh 208016 India
| | - Seema Sharma
- Department of Chemical Engineering (CHE) & DST Unit on Nano Sciences; Indian Institute of Technology (IIT)-Kanpur; Kanpur, Uttar Pradesh 208016 India
| | - Ashutosh Sharma
- Department of Chemical Engineering (CHE) & DST Unit on Nano Sciences; Indian Institute of Technology (IIT)-Kanpur; Kanpur, Uttar Pradesh 208016 India
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Vilela D, González MC, Escarpa A. Nanoparticles as analytical tools for in-vitro antioxidant-capacity assessment and beyond. Trends Analyt Chem 2015. [DOI: 10.1016/j.trac.2014.07.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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15
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Magnetically controllable dual-mode nanoprobes for cell imaging with an onion-liked structure. Talanta 2013; 116:978-84. [PMID: 24148504 DOI: 10.1016/j.talanta.2013.08.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2013] [Revised: 08/04/2013] [Accepted: 08/11/2013] [Indexed: 11/20/2022]
Abstract
A magnetically controllable dual-mode optical probe is demonstrated for cellular imaging with an onion-liked structure, which can exhibit both surface enhanced Raman scattering (SERS) and fluorescence signals. For obtaining such a nanoprobe, Fe3O4 nanoparticles were first encapsulated into an inner layer of silica, which were then coated with a second layer of gold nanoshell (designated as Fe3O4@SiO2@Au). By adjusting the thickness of the gold shell, the surface plasmon resonance (SPR) of Fe3O4@SiO2@Au nanoparticles can be easily tuned from visible to near-infrared (NIR) region. Afterwards, the prepared Fe3O4@SiO2@Au nanoparticles were tagged with a third layer of Raman reporters to exhibit SERS signals and further coated with an outmost layer of dye-doped silica to generate fluorescence. When being excited at different wavelengths as 515nm and 633nm, the distinct fluorescence and SERS signals can be separately observed. More interestingly, an enhanced cellular uptake of the presented nanoprobes was observed in the presence of a magnetic field, which was proved by both fluorescence and SERS images. This onion-liked multi-modal nanoplatform has great potential in bio-imaging, targeted delivery applications and biological separations.
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Sharpe E, Frasco T, Andreescu D, Andreescu S. Portable ceria nanoparticle-based assay for rapid detection of food antioxidants (NanoCerac). Analyst 2013; 138:249-62. [PMID: 23139929 PMCID: PMC3518284 DOI: 10.1039/c2an36205h] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With increased awareness of nutrition and the advocacy for healthier food choices, there exists a great demand for a simple, easy-to-use test that can reliably measure the antioxidant capacity of dietary products. We report development and characterization of a portable nanoparticle based-assay, similar to a small sensor patch, for rapid and sensitive detection of food antioxidants. The assay is based on the use of immobilized ceria nanoparticles, which change color after interaction with antioxidants by means of redox and surface chemistry reactions. Monitoring corresponding optical changes enables sensitive detection of antioxidants in which the nanoceria provides an optical 'signature' of antioxidant power, while the antioxidants act as reducing agents. The sensor has been tested for the detection of common antioxidant compounds including ascorbic acid, gallic acid, vanillic acid, quercetin, caffeic acid, and epigallocatechin gallate and its function has been successfully applied for the assessment of antioxidant activity in real samples (teas and medicinal mushrooms). The colorimetric response was concentration dependent, with detection limits ranging from 20 to 400 μM depending on the antioxidant involved. Steady-state color intensity was achieved within seconds upon addition of antioxidants. The results are presented in terms of Gallic Acid Equivalents (GAE). The sensor performed favorably when compared with commonly used antioxidant detection methods. This assay is particularly appealing for remote sensing applications, where specialized equipment is not available, and also for high throughput analysis of a large number of samples. Potential applications for antioxidant detection in remote locations are envisioned.
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Affiliation(s)
- Erica Sharpe
- Department of Chemistry and Biomolecular Science Potsdam, NY 13699-5810
| | - Thalia Frasco
- Department of Chemistry and Biomolecular Science Potsdam, NY 13699-5810
| | - Daniel Andreescu
- Department of Chemistry and Biomolecular Science Potsdam, NY 13699-5810
| | - Silvana Andreescu
- Department of Chemistry and Biomolecular Science Potsdam, NY 13699-5810
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