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Salim E, Hany W, Elshahawy AG, Oraby AH. Investigation on optical, structural and electrical properties of solid-state polymer nanocomposites electrolyte incorporated with Ag nanoparticles. Sci Rep 2022; 12:21201. [PMID: 36481775 PMCID: PMC9732284 DOI: 10.1038/s41598-022-25304-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 11/28/2022] [Indexed: 12/13/2022] Open
Abstract
A solid polymer electrolyte based on polyvinyl alcohol (PVA)/carboxymethyl cellulose (CMC)/polyethylene 3,4-dioxythiophene: sodium polystyrene sulfonate (PEDOT:PSS) has been prepared with various concentrations of incorporated silver (Ag) nanoparticles (NPs) by using solution cast approach. The FTIR spectroscopic study revealed the complexation between the polymeric nanocomposite (PNC) and the Ag NPs. The X-ray diffraction (XRD) results infer that the semicrystalline phase of PNC decreases as the amount of incorporated Ag NPs increases. The transmission electron microscope (TEM) image revealed that Ag NPs have diameters ranging from 22 to 43 nm. Complex dielectric permittivity and alternating current (AC) electrical conductivity of nanocomposite films have been investigated in the frequency range from 0.1 Hz to 20 MHz at 30 °C. Dc conductivity ([Formula: see text]) values for the nanocomposite films are estimated from AC conductivity plots. The [Formula: see text] value was observed to increase from 1.98 × 10-9 to 2.29 × 10-7 S.cm-1 for the PNC system incorporated with optimal Ag NPs. From complex impedance (Z*) analysis, it has been found that the bulk electrical resistance (Rb) of the PNC films decreases with increasing the Ag NPs content. Therefore, these obtained PNC films have promising applications in energy storage devices.
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Affiliation(s)
- E Salim
- Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
| | - Wessam Hany
- Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt
| | - A G Elshahawy
- Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt
| | - A H Oraby
- Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt
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Rahmati S, Doherty W, Amani Babadi A, Akmal Che Mansor MS, Julkapli NM, Hessel V, Ostrikov K(K. Gold-Carbon Nanocomposites for Environmental Contaminant Sensing. MICROMACHINES 2021; 12:mi12060719. [PMID: 34205255 PMCID: PMC8234806 DOI: 10.3390/mi12060719] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 06/14/2021] [Accepted: 06/16/2021] [Indexed: 11/16/2022]
Abstract
The environmental crisis, due to the rapid growth of the world population and globalisation, is a serious concern of this century. Nanoscience and nanotechnology play an important role in addressing a wide range of environmental issues with innovative and successful solutions. Identification and control of emerging chemical contaminants have received substantial interest in recent years. As a result, there is a need for reliable and rapid analytical tools capable of performing sample analysis with high sensitivity, broad selectivity, desired stability, and minimal sample handling for the detection, degradation, and removal of hazardous contaminants. In this review, various gold–carbon nanocomposites-based sensors/biosensors that have been developed thus far are explored. The electrochemical platforms, synthesis, diverse applications, and effective monitoring of environmental pollutants are investigated comparatively.
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Affiliation(s)
- Shahrooz Rahmati
- School of Chemistry and Physics, Queensland University of Technology (QUT), Brisbane 4000, Australia;
- Centre for Agriculture and the Bioeconomy, Institute for Future Environments, Queensland University of Technology (QUT), Brisbane 4000, Australia;
- Centre for Material Science, Queensland University of Technology (QUT), Queensland, Brisbane, Brisbane 4000, Australia
- Nanotechnology & Catalysis Research Centre (NANOCAT), Institute of Graduate Studies, University of Malaya, Kuala Lumpur 50603, Malaysia;
- Correspondence: (S.R.); (N.M.J.)
| | - William Doherty
- Centre for Agriculture and the Bioeconomy, Institute for Future Environments, Queensland University of Technology (QUT), Brisbane 4000, Australia;
| | - Arman Amani Babadi
- Functional Omics and Bioprocess Development Laboratory, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia;
| | - Muhamad Syamim Akmal Che Mansor
- Nanotechnology & Catalysis Research Centre (NANOCAT), Institute of Graduate Studies, University of Malaya, Kuala Lumpur 50603, Malaysia;
| | - Nurhidayatullaili Muhd Julkapli
- Nanotechnology & Catalysis Research Centre (NANOCAT), Institute of Graduate Studies, University of Malaya, Kuala Lumpur 50603, Malaysia;
- Correspondence: (S.R.); (N.M.J.)
| | - Volker Hessel
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide 5005, Australia;
- School of Engineering, University of Warwick, Library Rd, Coventry CV4 7AL, UK
| | - Kostya (Ken) Ostrikov
- School of Chemistry and Physics, Queensland University of Technology (QUT), Brisbane 4000, Australia;
- Centre for Agriculture and the Bioeconomy, Institute for Future Environments, Queensland University of Technology (QUT), Brisbane 4000, Australia;
- Centre for Material Science, Queensland University of Technology (QUT), Queensland, Brisbane, Brisbane 4000, Australia
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A facile and green approach for the fabrication of nano-biocomposites by reducing silver salt solution into silver nanoparticles using modified carboxymethyl cellulose for antimicrobial potential. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02437-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Posha B, Kuttoth H, Sandhyarani N. Layer-by-Layer Assembly of Polycations and Polyanions for the Sensitive Detection of Endotoxin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:257-265. [PMID: 33356305 DOI: 10.1021/acs.langmuir.0c02852] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Bacterial endotoxin detection is an essential safety requisite in biomedical, food, and pharmaceutical industries. Endotoxin in a sufficient concentration on entering the human bloodstream causes detrimental effects such as septic shock, which can lead to death. Hence, the sensitive and selective detection of endotoxin also known as lipopolysaccharide (LPS) is of paramount importance. Herein, a layer-by-layer (LBL) assembly of gold-chitosan nanocomposite (CGNC)-poly(acrylic acid) (PAA)-polymyxin B (PmB) on gold (Au) electrode is employed for the sensitive and selective detection of endotoxin. The surface electric charge studies using dynamic contact mode electrostatic force microscopy (DC-EFM) revealed the successful formation of each layer on the Au electrode. The polycationic PmB is a specific bioreceptor of LPS, which binds with high affinity to the anionic groups of the carbohydrate portions of LPS molecules and facilitates the selective electrochemical detection. This surface modification method presented a sensitive and selective detection of endotoxin down to the attogram level.
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Affiliation(s)
- Biyas Posha
- Nanoscience Research Laboratory, School of Materials Science and Engineering, National Institute of Technology Calicut, Calicut 673601, Kerala, India
| | - Haritha Kuttoth
- Nanoscience Research Laboratory, School of Materials Science and Engineering, National Institute of Technology Calicut, Calicut 673601, Kerala, India
| | - N Sandhyarani
- Nanoscience Research Laboratory, School of Materials Science and Engineering, National Institute of Technology Calicut, Calicut 673601, Kerala, India
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Singh L, Singh V. Synthesis of Ag@PANI nanocomposites by complexation method and their application as label-free chemo-probe for detection of mercury ions. JOURNAL OF POLYMER ENGINEERING 2020. [DOI: 10.1515/polyeng-2020-0047] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
A novel optical probe consistinsg of Ag@PANI (silver-polyaniline) nanocomposites was developed for detection of mercury ions (Hg2+). The poly-dispersed Ag@PANI nanocomposites were synthesized by complexation reaction method. We studied structural and functional properties of polymer nanocomposites thoroughly. Ag@PANI nanocomposites consist of fibrous morphology with a mean particle size of 31.39 nm. Ag@PANI nanocomposites consist of face-centered cubic crystal structure with an average crystallite size of 19.41 nm. Raman spectroscopy was used in sensitive and selective detection of Hg2+ ions in dynamic range of 0.01–0.1 ppm with limit of detection of 0.019 ppm. Ag@PANI nanocomposite sensor for Hg (II) ions has shown some sublime results in pH range 3–5. Ag@PANI-based sensing probe can be beneficial for Hg2+ ions detection in highly sensitive biological, chemical and environmental analysis. Our sensing probe has shown good reproducibility, and all recorded observations revealed that sensing probe consisting of Ag@PANI nanocomposites is well suited for detection of Hg2+ ions.
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Affiliation(s)
- Lovepreet Singh
- Department of Materials Science and Engineering , National Institute of Technology , Hamirpur , Himachal Pradesh, 177005 , India
| | - Vishal Singh
- Department of Materials Science and Engineering , National Institute of Technology , Hamirpur , Himachal Pradesh, 177005 , India
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Lou BS, Rajaji U, Chen SM, Chen TW. A simple sonochemical assisted synthesis of NiMoO 4/chitosan nanocomposite for electrochemical sensing of amlodipine in pharmaceutical and serum samples. ULTRASONICS SONOCHEMISTRY 2020; 64:104827. [PMID: 31953007 DOI: 10.1016/j.ultsonch.2019.104827] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 10/08/2019] [Accepted: 10/11/2019] [Indexed: 06/10/2023]
Abstract
In this investigation, a facile sonochemical route has been developed for the preparation of porous nickel molybdate nanosheets/chitosan nanocomposite (NiMoO4/CHIT) by using ammonium molybdate and nickel(II) acetate tetrahydrate and as nickel and molybdate precursor, respectively (ultrasonic power 60 W/cm2 and frequency 20 kHz). The ultrasonic based materials preparation as a fast, convenient and economical approach has been widely used to generate novel nanomaterials. Herein, we report an efficient voltammetric sensor for amlodipine drug by using porous nickel molybdate nanosheets/chitosan nanocomposite (NiMoO4/CHIT). Its structure and properties were characterized by x-ray diffraction pattern, scanning electron microscope, transmission electron microscope, elemental analysis and mapping. The electrochemical studies are indicated the NiMoO4/CHIT modified glassy carbon electrode (GCE) exhibited the good performance towards electrocatalytic sensing of amlodipine drug. Consequently, a linear correlation between the anodic peak current with sensor concentration 0.025-373.6 µM with a detection limit and sensitivity of 4.62 nM and 4.753 µA·µM-1·cm-2, respectively. A voltammetry based drug analysis was found to be high sensitive and reproducible, which able to detect nanomolar concentration. Furthermore, the fabricated electrochemical sensor was applied in drug and biological samples.
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Affiliation(s)
- Bih-Show Lou
- Chemistry Division, Center for General Education, Chang Gung University, Taoyuan 333, Taiwan; Department of Nuclear Medicine and Molecular Imaging Center, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan
| | - Umamaheswari Rajaji
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, Republic of China
| | - Shen-Ming Chen
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, Republic of China.
| | - Tse-Wei Chen
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, Republic of China
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Lee JH, Jeong D, Kanmani P. Study on physical and mechanical properties of the biopolymer/silver based active nanocomposite films with antimicrobial activity. Carbohydr Polym 2019; 224:115159. [DOI: 10.1016/j.carbpol.2019.115159] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 07/08/2019] [Accepted: 08/01/2019] [Indexed: 01/17/2023]
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Facile Synthesis of Nitrogen-Doped Carbon Quantum Dots with Chitosan for Fluorescent Detection of Fe 3. Polymers (Basel) 2019; 11:polym11111731. [PMID: 31652826 PMCID: PMC6918340 DOI: 10.3390/polym11111731] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Revised: 10/17/2019] [Accepted: 10/19/2019] [Indexed: 12/19/2022] Open
Abstract
A facile, economical, and one-step hydrothermal method was used to prepare highly luminescent nitrogen-doped carbon quantum dots (N-CQDs) with chitosan as both carbon and nitrogen sources. The as-prepared N-CQDs have an average size of 2 nm and exhibit excitation wavelength-dependent fluorescence with a maximum excitation and emission at 330 and 410 nm, respectively. Furthermore, due to the effective quenching effect of Fe3+ ions, the prepared N-CQDs can be used as a fluorescent sensor for Fe3+ ion-sensitive detection with a detection limit of 0.15 μM. The selectivity experiments revealed that the fluorescent sensor is specific to Fe3+ even with interference by high concentrations of other metal ions. Most importantly, the N-CQD-based Fe3+ ion sensor can be successfully applied to the determination of Fe3+ in real water samples. With excellent sensitivity and selectivity, such stable and cheap carbon materials are potentially suitable for the monitoring of Fe3+ in environmental application.
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Dykman LA, Khlebtsov NG. Methods for chemical synthesis of colloidal gold. RUSSIAN CHEMICAL REVIEWS 2019. [DOI: 10.1070/rcr4843] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Younes N, Pintus G, Al-Asmakh M, Rasool K, Younes S, Calzolari S, Mahmoud KA, Nasrallah GK. “Safe” Chitosan/Zinc Oxide Nanocomposite Has Minimal Organ-Specific Toxicity in Early Stages of Zebrafish Development. ACS Biomater Sci Eng 2019; 6:38-47. [DOI: 10.1021/acsbiomaterials.8b01144] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
| | | | | | - Kashif Rasool
- Qatar Environment
and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, P.O. Box 34110, Doha, Qatar
| | | | - Simone Calzolari
- ZeClinics SL, PRBB (Barcelona Biomedical Research Park), 08003 Barcelona, Spain
| | - Khaled A. Mahmoud
- Qatar Environment
and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, P.O. Box 34110, Doha, Qatar
- Department of Physics & Mathematical Engineering, Faculty of Engineering, Port Said University, 42523 Port Said, Egypt
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Shen FW, Zhou KC, Cai H, Zhang YN, Zheng YL, Quan J. One-pot synthesis of thermosensitive glycopolymers grafted gold nanoparticles and their lectin recognition. Colloids Surf B Biointerfaces 2019; 173:504-511. [DOI: 10.1016/j.colsurfb.2018.10.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Revised: 10/06/2018] [Accepted: 10/09/2018] [Indexed: 02/07/2023]
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Kobayashi N, Sakai S, Sasaki Y, Kubo M, Tsukada T, Sugioka KI, Takami S, Adschiri T. Crack Formation in Polymer Nanocomposite Thin Films Containing Surface-Modified Nanoparticles during Solution Casting. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2018. [DOI: 10.1252/jcej.17we323] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Shinji Sakai
- Department of Chemical Engineering, Tohoku University
| | - Yudai Sasaki
- Department of Chemical Engineering, Tohoku University
| | - Masaki Kubo
- Department of Chemical Engineering, Tohoku University
| | - Takao Tsukada
- Department of Chemical Engineering, Tohoku University
| | - Ken-ichi Sugioka
- Department of Mechanical Systems Engineering, Toyama Prefectural University
| | - Seiichi Takami
- Department of Materials Process Engineering, Nagoya University
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Xu R, Aotegen B, Zhong Z. Synthesis, characterization and biological activity of C 6 -Schiff bases derivatives of chitosan. Int J Biol Macromol 2017; 105:1563-1571. [DOI: 10.1016/j.ijbiomac.2017.06.119] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 04/12/2017] [Accepted: 06/29/2017] [Indexed: 11/30/2022]
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Label-free immunosensor based on one-step electrodeposition of chitosan-gold nanoparticles biocompatible film on Au microelectrode for determination of aflatoxin B1 in maize. Biosens Bioelectron 2016; 80:222-229. [PMID: 26851579 DOI: 10.1016/j.bios.2016.01.063] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 01/26/2016] [Accepted: 01/27/2016] [Indexed: 11/24/2022]
Abstract
Gold nanoparticles (AuNPs) embedded in chitosan (CHI) film, well-dispersed and smaller in size (about 10 nm), were fabricated by one-step electrodeposion on Au microelectrode in solution containing chitosan and chloride trihydrate. The nano-structure CHI-AuNPs composite film offers abundant amine groups, good conductivity, excellent biocompatibility and stability for antibody immobilization. The combination of aflatoxin B1 (AFB1) with immobilized antibody introduces a barrier to electron transfer, resulting in current decreasement. The morphologies and characterizations of modified microelectrodes were investigated by scanning electron microscope (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Fourier transform infrared spectroscopy (FT-IR). The proposed non-enzyme and label-free immunosensor exhibited high sensitive amperometric response to AFB1 concentration in two linear ranges of 0.1 to 1 ng mL(-1) and 1 to 30 ng mL(-1), with the detection limit of 0.06 ng mL(-1) (S/N=3). The immunoassay was also applied for analysis of maize samples spiked with AFB1. Considering the sample extraction procedure, the linear range and limit of detection were assessed to be 1.6-16 ng mL(-1) and 0.19 ng mL(-1) respectively. The simple method showed good fabrication controllability and reproducibility for immunosensor design.
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Liu Y, Kato T, Kubo M, Sugioka KI, Tsukada T, Takami S, Adschiri T. Annealing-promoted unidirectional migration of organic-modified nanoparticles embedded two-dimensionally in polymer thin films. J Appl Polym Sci 2015. [DOI: 10.1002/app.42760] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Yang Liu
- Department of Chemical Engineering; Tohoku University; Aoba-Ku, Sendai 980-8579 Japan
| | - Takumi Kato
- Department of Chemical Engineering; Tohoku University; Aoba-Ku, Sendai 980-8579 Japan
| | - Masaki Kubo
- Department of Chemical Engineering; Tohoku University; Aoba-Ku, Sendai 980-8579 Japan
| | - Ken-Ichi Sugioka
- Department of Mechanical Systems Engineering; Toyama Prefectural University; Kurokawa, Imizu 939-0398 Japan
| | - Takao Tsukada
- Department of Chemical Engineering; Tohoku University; Aoba-Ku, Sendai 980-8579 Japan
| | - Seiichi Takami
- Institute of Multidisciplinary Research for Advanced Materials; Tohoku University; Aoba-Ku, Sendai 980-8577 Japan
| | - Tadafumi Adschiri
- WPI Advanced Institute for Materials Research; Tohoku University; Aoba-Ku, Sendai 980-8577 Japan
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P MR, Muraleedaran K, Mujeeb VA. Applications of chitosan powder with in situ synthesized nano ZnO particles as an antimicrobial agent. Int J Biol Macromol 2015; 77:266-72. [DOI: 10.1016/j.ijbiomac.2015.03.058] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2014] [Revised: 03/24/2015] [Accepted: 03/25/2015] [Indexed: 10/23/2022]
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17
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Pei D, Li Y, Huang Q, Ren Q, Li F, Shi T. Biomimetic glycopolymers tethered gold nanoparticles: Preparation, self-assembly and lectin recognition properties. Colloids Surf B Biointerfaces 2015; 126:367-73. [DOI: 10.1016/j.colsurfb.2014.11.046] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Revised: 11/25/2014] [Accepted: 11/30/2014] [Indexed: 12/22/2022]
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Della Pelle F, Vilela D, González MC, Lo Sterzo C, Compagnone D, Del Carlo M, Escarpa A. Antioxidant capacity index based on gold nanoparticles formation. Application to extra virgin olive oil samples. Food Chem 2015; 178:70-5. [PMID: 25704685 DOI: 10.1016/j.foodchem.2015.01.045] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 06/18/2014] [Accepted: 01/06/2015] [Indexed: 01/18/2023]
Abstract
A simple gold nanoparticles (AuNPs) based colorimetric assay for the antioxidant activity determination has been developed. The AuNP formation is mediated by extra virgin olive oil (EVOO's) endogenous polyphenols; the reaction is described by a sigmoidal curve. The ratio KAuNPs/Xc(50) (slope of the linear part of the sigmoid/concentration at half value of the absorbance) was found to be the optimal parameter to report the antioxidant capacity with respect to the single KAuNPs or Xc(50) values. The obtained data demonstrated that the compounds with ortho-diphenols functionality are most active in reducing gold (III) to gold (0). Thus, intermediate activity was found for gallic acid, while tyrosol (mono-phenols) had a significant lower activity than the others antioxidant compounds (at least one order of magnitude). In the analysis of olive oil samples, a significant correlation among classical methods used to determine antioxidant activity and the proposed parameter was found with R values in the 0.96-0.97 range.
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Affiliation(s)
- Flavio Della Pelle
- Departamento de Química Analítica, Química-Física e Ingeniería Química, Facultad de Química, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain; Facoltà di Bioscienze e Tecnologie Agro-Alimentari e Ambientali, Università degli Studi di Teramo, 64023 Mosciano Sant'Angelo, Italy
| | - Diana Vilela
- Departamento de Química Analítica, Química-Física e Ingeniería Química, Facultad de Química, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain
| | - María Cristina González
- Departamento de Química Analítica, Química-Física e Ingeniería Química, Facultad de Química, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain
| | - Claudio Lo Sterzo
- Facoltà di Bioscienze e Tecnologie Agro-Alimentari e Ambientali, Università degli Studi di Teramo, 64023 Mosciano Sant'Angelo, Italy
| | - Darío Compagnone
- Facoltà di Bioscienze e Tecnologie Agro-Alimentari e Ambientali, Università degli Studi di Teramo, 64023 Mosciano Sant'Angelo, Italy
| | - Michele Del Carlo
- Facoltà di Bioscienze e Tecnologie Agro-Alimentari e Ambientali, Università degli Studi di Teramo, 64023 Mosciano Sant'Angelo, Italy.
| | - Alberto Escarpa
- Departamento de Química Analítica, Química-Física e Ingeniería Química, Facultad de Química, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain.
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Chandran PR, Sandhyarani N. An electric field responsive drug delivery system based on chitosan–gold nanocomposites for site specific and controlled delivery of 5-fluorouracil. RSC Adv 2014. [DOI: 10.1039/c4ra07551j] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Wang Y, Ge H, Wu Y, Ye G, Chen H, Hu X. Construction of an electrochemical sensor based on amino-functionalized metal-organic frameworks for differential pulse anodic stripping voltammetric determination of lead. Talanta 2014; 129:100-5. [PMID: 25127570 DOI: 10.1016/j.talanta.2014.05.014] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 05/06/2014] [Accepted: 05/10/2014] [Indexed: 11/26/2022]
Abstract
Metal-organic frameworks composite materials have received tremendous attention because of their versatile structures and tunable porosity for various applications. Herein, amino-functionalized metal-organic frameworks (NH2-Cu3(BTC)2; BTC=benzene-1,3,5-tricarboxylate) was prepared and used as a novel electrode modifier for the determination of trace levels of lead. NH2-Cu3(BTC)2 shows quite a good capability for the efficient adsorption of lead from aqueous solutions. The parameters affecting the electrochemical process, such as electrolyte solution pH, the amount of NH2-Cu3(BTC)2 suspension, accumulation potential and accumulation time, were investigated in detail. Under the optimal conditions, the electrochemical sensor exhibited a linear response to the concentration of lead in the range of 1.0×10(-8)-5.0×10(-7) mol L(-1) (R(2)=0.9951) with a detection limit of 5.0×10(-9) mol L(-1). The relative standard deviation of 11 successive scans was 3.10% for 1.0×10(-8) mol L(-1) lead. The method was validated with certified reference material (stream sediment and milk powder) and the analytical results coincided well with the certified values. Furthermore, the method was successfully applied to the determination of target analytes in tap and lake water samples and good recoveries were obtained from different spiked values.
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Affiliation(s)
- Yang Wang
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| | - Huali Ge
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Yichun Wu
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Guiqin Ye
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Huanhuan Chen
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Xiaoya Hu
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
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Ramasamy RP, Maliyekkal SM. Formation of gold nanoparticles upon chitosan leading to formation and collapse of gels. NEW J CHEM 2014. [DOI: 10.1039/c3nj00603d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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A highly sensitive electrochemical glucose sensor structuring with nickel hydroxide and enzyme glucose oxidase. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.07.010] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ionita G, Marinescu G, Ilie C, Anghel DF, Smith DK, Chechik V. Sorption of metal ions by poly(ethylene glycol)/β-CD hydrogels leads to gel-embedded metal nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:9173-9178. [PMID: 23782340 DOI: 10.1021/la401541p] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Inorganic nanoparticles can be embedded within gels by selectively preloading them with suitable molecular precursors followed by reduction or another suitable reaction. Here, we exploit the selective sorption properties of cross-linked β-cyclodextrin/poly(ethylene glycol) hydrogels, in analogy with polyurethane foams, to preconcentrate metal salts (HAuCl4 and K2[Co(SCN)4]) and subsequently generate gel-embedded metal nanoparticles (10-50 nm). The nanoparticles are shown to be immobilized within the gel network as a consequence of their large dimensions in comparison to the gel network pore size. We suggest this is a useful approach for the generalized synthesis of hybrid soft-hard nanomaterials.
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Affiliation(s)
- Gabriela Ionita
- Ilie Murgulescu Institute of Physical Chemistry of the Romanian Academy, 202 Spl. Independentei, Bucharest, 060021, Romania
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Lian W, Liu S, Yu J, Li J, Cui M, Xu W, Huang J. Electrochemical sensor using neomycin-imprinted film as recognition element based on chitosan-silver nanoparticles/graphene-multiwalled carbon nanotubes composites modified electrode. Biosens Bioelectron 2013; 44:70-6. [PMID: 23395725 DOI: 10.1016/j.bios.2013.01.002] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Revised: 12/30/2012] [Accepted: 01/02/2013] [Indexed: 02/07/2023]
Abstract
A novel imprinted electrochemical sensor for neomycin recognition was developed based on chitosan-silver nanoparticles (CS-SNP)/graphene-multiwalled carbon nanotubes (GR-MWCNTs) composites decorated gold electrode. Molecularly imprinted polymers (MIPs) were synthesized by electropolymerization using neomycin as the template, and pyrrole as the monomer. The mechanism of the fabrication process and a number of factors affecting the activity of the imprinted sensor have been discussed and optimized. The characterization of imprinted sensor has been carried out by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). The performance of the proposed imprinted sensor has been investigated using cyclic voltammetry (CV) and amperometry. Under the optimized conditions, the linear range of the sensor was from 9×10(-9)mol/L to 7×10(-6)mol/L, with the limit of detection (LOD) of 7.63×10(-9)mol/L (S/N=3). The film exhibited high binding affinity and selectivity towards the template neomycin, as well as good reproducibility and stability. Furthermore, the proposed sensor was applied to determine the neomycin in milk and honey samples based on its good reproducibility and stability, and the acceptable recovery implied its feasibility for practical application.
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Affiliation(s)
- Wenjing Lian
- Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
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Kocak N, Sahin M, Kücükkolbasi S, Erdogan ZO. Synthesis and characterization of novel nano-chitosan Schiff base and use of lead (II) sensor. Int J Biol Macromol 2012; 51:1159-66. [PMID: 22982811 DOI: 10.1016/j.ijbiomac.2012.09.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 09/01/2012] [Accepted: 09/05/2012] [Indexed: 11/15/2022]
Abstract
A new kind of nano-chitosan Schiff base ligand (CHNS) with particle size of 34 nm was formed by the reaction between the 2-amino groups of glucosamine residue of nano-chitosan and a 2,5-dihydroxybenzaldehyde. The chemical structures of the nano-chitosan and nano-chitosan Schiff base were characterized by FT-IR spectra, particle sizer, zeta potential, and elemental analysis. A new, simple and effective chemically modified carbon paste electrode with CHNS was prepared and used as a lead (II) sensor. The prepared electrode was characterized using scanning electronic microscopy (SEM-EDX) and cyclic voltammetry (CV). The modified electrode showed only one oxidation peak in the anodic scan at -0.34 V (vs. Ag/AgCl) for the oxidation of lead (II). The dedection limit (LOD) was calculated as 1.36×10(-7) for a 10-min preconcentration time at pH 6.0.
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Affiliation(s)
- Nuriye Kocak
- Necmettin Erbakan University, Faculty of Education, Department of Science Education, 42090 Konya, Turkey.
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