1
|
Diffusion kinetics of vitamin B6 from phase-separated gelatin and agarose gels using blending law modelling. Food Hydrocoll 2023. [DOI: 10.1016/j.foodhyd.2023.108519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
|
2
|
Chang R, Wang T, Liu Q, Tang J, Wu D. Ag Nanoparticles@Agar Gel as a 3D Flexible and Stable SERS Substrate with Ultrahigh Sensitivity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:13822-13832. [PMID: 36326574 DOI: 10.1021/acs.langmuir.2c01966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Flexible surface-enhanced Raman scattering (SERS) substrates have become one of the research hot spots due to the facile sampling by swabbing or wrapping on rough surfaces and the sensitive and nondestructive detection of contaminants. In this work, we proposed a simple and fast in situ reduction method to prepare Ag nanoparticles (Ag NPs) composited agar hydrogel (Ag NPs@Agar) flexible SERS substrate. Owing to the three-dimensional (3D) structure, good hydrophilicity and adsorption of the agar hydrogel, Ag NPs were grown uniformly in the 3D cross-linked structure. The distribution density of Ag NPs was further increased by the volume shrinkage when the hydrogel was dried in air. This high density and uniformly distribution of Ag NPs produced a large number of highly active SERS regions. In addition, the sensitivity of Ag NPs@Agar was further improved with the assistance of hydrophilic agar gel, which can trap the probe molecules into highly active SERS areas. The SERS results showed that the substrate can be used to detect dye molecules (rhodamine 6G), the minimum detectable concentration was 10-15 M, the relative standard deviation tested at 18 different positions was only 7.58%, and the intensity of the characteristic peak at 611 cm-1 decreased only about 10% after 49 days of storage, demonstrating the superior stability. Moreover, the Ag NPs@Agar substrate also could successfully achieve the micro-trace detection of melamine and sodium penicillin G in Xinjiang specialty camel milk powder. The above available results show that the prepared flexible Ag NPs@Agar SERS substrates possess potentials for the illegal additives and antibiotics in food safety analysis.
Collapse
Affiliation(s)
- Rong Chang
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources; College of Chemistry, Xinjiang University, Urumqi830046, Xinjiang, PR China
| | - Tao Wang
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources; College of Chemistry, Xinjiang University, Urumqi830046, Xinjiang, PR China
| | - Qian Liu
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources; College of Chemistry, Xinjiang University, Urumqi830046, Xinjiang, PR China
| | - Jun Tang
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources; College of Chemistry, Xinjiang University, Urumqi830046, Xinjiang, PR China
| | - Dongling Wu
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources; College of Chemistry, Xinjiang University, Urumqi830046, Xinjiang, PR China
| |
Collapse
|
3
|
Folks C, Phuyal US, Rajesh M, Arja N, Gladden M, Hamm L, De Silva Indrasekara AS. Fabrication and Comparative Quantitative Analysis of Plasmonic-Polymer Nanocomposites as Optical Platforms. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:12853-12866. [PMID: 34705467 DOI: 10.1021/acs.langmuir.1c01826] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Plasmonic-polymer nanocomposites can serve as a multifunctional platform for a wide range of applications such as biochemical sensing and photothermal treatments, where they synergistically benefit from the extraordinary optical properties of plasmonic nanoparticles (NPs) and biocompatible characteristics of biopolymers. The field translation of plasmonic-polymer nanocomposites requires design rules for scalable and reproducible fabrication with tunable and predictable optical properties and achieving the best performance. The optical properties of NPs and the optimal analytical performance of nanocomposites could be affected by many fabrication parameters, but a fundamental understanding of such parameters is still minimal. Herein, we systematically investigated the NP distribution and their optical properties in gold nanostar (GNS)-polymer nanocomposites as a function of GNS concentration, polymer identity, and the method of GNS incorporation into a polymer matrix. We performed a comprehensive analysis of the single-particle scattering spectra of GNS incorporated into agarose gel and chitosan hydrogels via embedding and surface deposition, using dark-field spectroscopy. While relative GNS concentration affects the GNS scattering property distribution in both polymer matrices, chemical interactions between a polymer matrix and GNS is the key determinant of the GNS stability and homogenous distribution in nanocomposites. When GNS are embedded in a polymer matrix and there are stronger chemical interactions between GNS and a polymer, significantly less aggregation and a more homogenous distribution of GNS, which leads to a larger percentage of GNS optical property preservation, were observed at all the concentrations. In a proof-of-concept surface-enhanced Raman spectroscopy (SERS) study, we observed that the SERS detection efficiency is dictated by the analyte accessibility of GNS, which is governed by the polymer matrix porosity, polymer-GNS interactions, and other polymer physical characteristics. This work presents the interplay between key fabrication parameters and foundational design parameters for more predictable and reliable fabrication of plasmonic-polymer nanocomposites as an optical platform.
Collapse
Affiliation(s)
- Casey Folks
- Department of Chemistry, University of North Carolina at Charlotte, 9201 University City Blvd, Charlotte, North Carolina 28203, United States
| | - Uttam Sharma Phuyal
- Department of Chemistry, University of North Carolina at Charlotte, 9201 University City Blvd, Charlotte, North Carolina 28203, United States
| | - Mahima Rajesh
- Department of Chemistry, University of North Carolina at Charlotte, 9201 University City Blvd, Charlotte, North Carolina 28203, United States
| | - Nagathushara Arja
- Department of Chemistry, University of North Carolina at Charlotte, 9201 University City Blvd, Charlotte, North Carolina 28203, United States
| | - Michael Gladden
- Department of Chemistry, Winthrop University, 312-A Sims Building, Rock Hill, South Carolina 29733, United States
| | - Logan Hamm
- Department of Chemistry, University of North Carolina at Charlotte, 9201 University City Blvd, Charlotte, North Carolina 28203, United States
| | | |
Collapse
|
4
|
Sánchez-Iglesias A, Kruse J, Chuvilin A, Grzelczak M. Coupling plasmonic catalysis and nanocrystal growth through cyclic regeneration of NADH. NANOSCALE 2021; 13:15188-15192. [PMID: 34553737 DOI: 10.1039/d1nr04400a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In a typical colloidal synthesis, the molecules of the reducing agent are irreversibly oxidized during nanocrystal growth. Such a scenario is of questionable sustainability when confronted with naturally occurring processes in which reducing agent molecules are cyclically regenerated. Here we show that cofactor molecules once consumed in the nucleation and growth of metallic nanocrystals can be photoregenerated using metallic nanocrystals as photocatalysts and reused in the subsequent nucleation process. Cyclic regeneration of cofactor molecules opens up the possibilities for the sustainable synthesis of inorganic nanoparticles.
Collapse
Affiliation(s)
- Ana Sánchez-Iglesias
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), 20014 Donostia - San Sebastián, Spain
| | - Joscha Kruse
- Centro de Física de Materiales (CSIC-UPV/EHU) and Donostia International Physics Center, 20018 Donostia - San Sebastián, Spain.
| | - Andrey Chuvilin
- CIC nanoGUNE BRTA, 20018 Donostia - San Sebastián, Spain
- Ikerbasque Basque Foundation for Science, 48013 Bilbao, Spain
| | - Marek Grzelczak
- Centro de Física de Materiales (CSIC-UPV/EHU) and Donostia International Physics Center, 20018 Donostia - San Sebastián, Spain.
| |
Collapse
|
5
|
Liao Y, You R, Fan M, Feng S, Lu D, Lu Y. Determination of NADH by Surface Enhanced Raman Scattering Using Au@MB@Ag NPs. Aust J Chem 2021. [DOI: 10.1071/ch21178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Nicotinamide adenine dinucleotide (NADH) is an important coenzyme involved in various metabolic processes of living cells. As an important biomarker, NADH is associated with breast cancer and Alzheimer’s disease. In this paper, silver plated gold core–shell nanoparticles containing Raman signal molecules were synthesised on the basis of bare gold. Using the Raman peak corresponding to the 4-mercaptobenzonitrile (MB) silent region C≡N vibration for quantification, while avoiding competition with the precious metal surface binding site to be measured, it can also be free from the interference of endogenous biomolecules. On the one hand, it can correct the working curve, on the other hand, it can avoid competing with the binding site. Compared with the core–shell structure prepared here, the limit of detection (LOD) for NADH was only 10−5 M for bare gold and the LOD for the core–shell structure prepared on the basis of bare gold was 3.3 × 10−7 M. In terms of correction, with Rhodamine 6G (R6G) as a Raman signalling molecule, the R2 value before SERS detection and correction is only 0.9405, and the R2 value after correction increases to 0.9853. The unique fingerprint peak of SERS was used to realise the quantitative detection of NADH, which realizes the detection of NADH in complex biological samples of serum and provides the possibility for expanding the early diagnosis of breast cancer.
Collapse
|
6
|
Manafi Khajeh Pasha A, Hosseini M, Fakhri A, Gupta VK, Agarwal S. Investigation of photocatalytic process for iron disulfide-bismuth oxide nanocomposites by using response surface methodology: Structural and antibacterial properties. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.110950] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
|
7
|
Szűcs R, Balogh-Weiser D, Sánta-Bell E, Tóth-Szeles E, Varga T, Kónya Z, Poppe L, Lagzi I. Green synthesis and in situ immobilization of gold nanoparticles and their application for the reduction of p-nitrophenol in continuous-flow mode. RSC Adv 2019; 9:9193-9197. [PMID: 35517692 PMCID: PMC9062090 DOI: 10.1039/c8ra10373a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 03/02/2019] [Indexed: 12/02/2022] Open
Abstract
A green and facile method has been developed for the preparation of in situ immobilized gold nanoparticles (AuNPs) using agarose as a reducing and stabilizing agent. The size of the synthesized AuNPs ranges between 10 and 100 nm, and their average size can be controlled by the concentrations of the agarose and gold salt. The agarose matrix as a mild and green reaction medium can provide a good dispersion environment for forming AuNPs, and the hydrogel can be well homogenized with polyacrylic macroporous microbeads as well, which can adsorb and stabilize the particles leading to the simultaneous synthesis and immobilization of AuNPs avoiding harmful inorganic compounds or organic solvents. The supported gold nanocatalyst was successfully applied as a catalyst in packed bed reactors for efficient NaBH4-mediated reduction of p-nitrophenol in continuous-flow mode. Gold nanoparticles synthesized using agarose and supported in macroporous polymer beads were used in continuous-flow mode in reduction of p-nitrophenol by sodium borohydride.![]()
Collapse
Affiliation(s)
- Rózsa Szűcs
- MTA-BME Computer Driven Chemistry
- Budapest University of Technology and Economics
- Budapest
- Hungary
- Department of Physics
| | - Diána Balogh-Weiser
- Department of Organic Chemistry and Technology
- Budapest University of Technology and Economics
- Budapest
- Hungary
- Department of Physical Chemistry and Materials Science
| | - Evelin Sánta-Bell
- Department of Organic Chemistry and Technology
- Budapest University of Technology and Economics
- Budapest
- Hungary
| | - Eszter Tóth-Szeles
- Department of Physics
- Budapest University of Technology and Economics
- Budapest
- Hungary
| | - Tamás Varga
- Department of Applied and Environmental Chemistry
- University of Szeged
- Szeged
- Hungary
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry
- University of Szeged
- Szeged
- Hungary
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group
| | - László Poppe
- Department of Organic Chemistry and Technology
- Budapest University of Technology and Economics
- Budapest
- Hungary
- Biocatalysis and Biotransformation Research Centre
| | - István Lagzi
- Department of Physics
- Budapest University of Technology and Economics
- Budapest
- Hungary
- MTA-BME Condensed Matter Research Group
| |
Collapse
|
8
|
HASSANVAND H, HASHEMI P. Synthesis of Silver Nanoparticles–Agarose Composite and Its Application to the Optical Detection of Cyanide Ion. ANAL SCI 2018; 34:567-570. [DOI: 10.2116/analsci.17p577] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Hatam HASSANVAND
- Department of Chemistry, Faculty of Science, Lorestan University
| | - Payman HASHEMI
- Department of Chemistry, Faculty of Science, Lorestan University
| |
Collapse
|
9
|
Yadav P, Singh SP, Rengan AK, Shanavas A, Srivastava R. Gold laced bio-macromolecules for theranostic application. Int J Biol Macromol 2018; 110:39-53. [DOI: 10.1016/j.ijbiomac.2017.10.124] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 09/26/2017] [Accepted: 10/18/2017] [Indexed: 02/07/2023]
|
10
|
|
11
|
Canrinus T, Lee WWY, Feringa BL, Bell SEJ, Browne WR. Supramolecular Low-Molecular-Weight Hydrogelator Stabilization of SERS-Active Aggregated Nanoparticles for Solution and Gas Sensing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:8805-8812. [PMID: 28669185 PMCID: PMC5588087 DOI: 10.1021/acs.langmuir.7b01445] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 06/23/2017] [Indexed: 06/07/2023]
Abstract
The potential of surface-enhanced Raman scattering (SERS) spectroscopy in both laboratory and field analyses depends on the reliable formation of so-called SERS hot spots, such as those formed during gold or silver nanoparticle aggregation. Unfortunately such aggregates are not stable in solution because they typically grow until they precipitate. Here we describe the use of low-molecular-weight hydrogels formed through pH-triggered self-assembly that occurs at a rate that well matches the rates of aggregation of Au or Ag colloids, allowing them to be trapped at the SERS-active point in the aggregation process. We show that the colloid-containing gels give SERS signals similar to the parent colloid but are stable over several months. Moreover, lyophilized gels can be stored as dry powders for subsequent use in the analyses of gases and dissolved analytes by contact with either solutions or vapors. The present system shows how the combination of pH-switchable low-molecular-weight gelators and pH-induced colloid aggregation can be combined to make a highly stable, low-cost SERS platform for the detection of volatile organic compounds and the microvolume analysis of solutions.
Collapse
Affiliation(s)
- Tjalling
R. Canrinus
- Molecular
Inorganic Chemistry, Stratingh Institute for Chemistry and Synthetic Organic
Chemistry, Stratingh Institute for Chemistry, Faculty
of Mathematics and Natural Sciences, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| | - Wendy W. Y. Lee
- School
of Chemistry and Chemical Engineering, Queen’s
University Belfast, David
Keir Building, Stranmillis Road, Belfast, BT9 5AG Northern Ireland
| | - Ben L. Feringa
- Molecular
Inorganic Chemistry, Stratingh Institute for Chemistry and Synthetic Organic
Chemistry, Stratingh Institute for Chemistry, Faculty
of Mathematics and Natural Sciences, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| | - Steven E. J. Bell
- School
of Chemistry and Chemical Engineering, Queen’s
University Belfast, David
Keir Building, Stranmillis Road, Belfast, BT9 5AG Northern Ireland
| | - Wesley R. Browne
- Molecular
Inorganic Chemistry, Stratingh Institute for Chemistry and Synthetic Organic
Chemistry, Stratingh Institute for Chemistry, Faculty
of Mathematics and Natural Sciences, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| |
Collapse
|