Article
Chemistry, Applied
Zichen Yang, Chaoqun Ma, Jiao Gu, Yamin Wu, Chun Zhu, Lei Li, Hui Gao, Wenzhi Yin, Zirui Wang, Guoqing Chen
Summary: By utilizing COF materials as ligands, we have successfully reduced the interference from milk adulterants and developed carboxyl-functionalized Ag-COF-COOH materials as SERS substrates for the detection of melamine. This method demonstrates high sensitivity and reliability, with a detection limit of 0.68 μg/L in liquid milk, and shows great potential for applications in the food surveillance industry.
Article
Chemistry, Physical
L. Mikac, I. Rigo, L. Himics, A. Tolic, M. Ivanda, M. Veres
Summary: Detection of microplastics remains challenging due to limitations in current methods, instrumentation, and particle size. In this study, surface-enhanced Raman spectroscopy (SERS) was used to successfully detect polystyrene (PS) and polyethylene (PE) particles in pure water. By synthesizing gold nanoparticles (Au NPs) of different sizes, and optimizing the conditions, efficient and stable SERS signals were observed on PS particles.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Applied
Chenguang Yi, Aihui Liang, Guiqing Wen, Zhiliang Jiang
Summary: A new method for rapid detection of ultratrace melamine in dairy products was established by coupling nanosurface molecular imprinting technology with nanocatalytic amplification reaction of liquid crystal particles. The method not only recognized melamine, but also catalyzed the production of gold nanoparticles with surface-enhanced Raman scattering and resonance Rayleigh scattering effects. The method showed high accuracy and stability in the determination of melamine in dairy products and plastic tablewares.
Article
Chemistry, Analytical
Kun Ge, Yuling Hu, Yanjie Zheng, Peichun Jiang, Gongke Li
Summary: The study utilized surface-enhanced Raman scattering (SERS) to selectively analyze melamine and formaldehyde, developing a membrane assembly method with high selectivity. The method showed excellent repeatability and reproducibility, accurately determining the concentrations of melamine and formaldehyde.
Article
Biotechnology & Applied Microbiology
Veronica Vespini, Simonetta Grilli, Pietro Ferraro, Romina Rega, Heidi Ottevaere, Yunfeng Nie, Pellegrino Musto, Marianna Pannico
Summary: The pyro-electrohydrodynamic jet printing technology was used to fabricate confined assemblies of gold nanoparticles and evaluated for its surface-enhanced Raman spectroscopy (SERS) performance. The results showed strong plasmonic effects, reproducible signals, and affinity with biomolecules, indicating potential applications in biosensing.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Shafiquzzaman Siddiquee, Suryani Saallah, Noor Aini Bohari, Gilbert Ringgit, Jumardi Roslan, Laila Naher, Nur Fatihah Hasan Nudin
Summary: The study introduced a facile method for determining melamine in milk powder products based on the aggregation of 5 nm gold nanoparticles. The method showed high sensitivity, good recoveries, and the ability for real-time detection by the naked eye.
Article
Engineering, Chemical
Wenhao Liu, Chuanshuang Hu, Weiwei Zhang, Hong Yun, Jianping Shu, Jin Gu
Summary: The interface bonding between melamine-faced board and UV coating is improved by grafting and condensing processes, resulting in enhanced printing durability. Chemical bonds are established between the two surfaces through the silane treatments. The modified surface shows a seamless connection with the UV coating, showing great potential for enhancing the adhesion of UV digital ink.
JOURNAL OF ADHESION
(2023)
Article
Chemistry, Physical
Tiago Fernandes, Sara Fateixa, Marta Ferro, Helena I. S. Nogueira, Ana L. Daniel-da-Silva, Tito Trindade
Summary: The use of dendrimers in the controlled synthesis of Ag:Au hybrid nanostructures enhances SERS sensitivity to organic pollutants. Dendrimers play a crucial role as multipurpose ligands in the formation of hybrid nanostructures, improving stability and sensitivity. Interparticle plasmonic coupling templated by dendrimer macromolecules contributes to the high SERS sensitivity of the hybrid nanostructures.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Analytical
Sheila Hernandez, Lydia Garcia, Martin Perez-Estebanez, William Cheuquepan, Aranzazu Heras, Alvaro Colina
Summary: A new, simple and fast protocol using time-resolved Raman spectroelectrochemistry to generate gold-based SERS substrates and detect melamine is presented in this work. The protocol shows significant figures of merit in a very short experiment time and provides valuable information about the interaction between the molecule and the generated substrate.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Anna Kundalevich, Andrey Zyubin, Karina Matveeva, Ilia Samusev, Ivan Lyatun
Summary: The article discusses the use of Raman spectroscopy and SERS to analyze fluorescent components in Baltic amber. By combining experimental methods with DFT simulations, the presence of anthracene derivatives in amber was confirmed. The proposed methods can be utilized to distinguish different types of amber and isolate specific components, allowing for the compilation of spectral maps and classification based on the amber's origin.
Article
Environmental Sciences
Xueqi Fan, Yixiang Bao, Mehvish Mumtaz, Jun Huang, Gang Yu
Summary: A new UV-activated persulfate method was developed as a faster alternative to the traditional heat-based TOP assay to convert PFASs precursors into detectable PFAAs. The UV-based TOP assay showed nearly complete conversion of FTS and FOSA within 60 minutes, with comparable results to the heat-based assay in industry samples. The UV-based TOP assay is efficient, reliable and faster than the conventional heat-based method.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Analytical
Zhiming Guo, Ping Chen, Mingming Wang, Alberta Osei Barimah, Quansheng Chen, Hesham R. El-Seedi, Xiaobo Zou
Summary: A novel superhydrophobic SERS substrate was developed for rapid detection of perchlorate in tea, achieving a detection limit of 0.0067 μmol/L (0.82 μg/kg). The developed sensor showed high sensitivity and could be used as a fast and simple technique for quantitative detection of perchlorate based on SERS technology.
ANALYTICAL METHODS
(2021)
Article
Chemistry, Applied
Andrey Shishov, Egor Nizov, Andrey Bulatov
Summary: This study demonstrated the effective liquid-phase microextraction of melamine from dairy products using deep eutectic solvents for the first time. The developed procedure involves precipitation of proteins from milk samples using salt (sodium sulfate) and subsequent extraction of melamine into a hydrophobic eutectic solution phase based on thymol and nonanoic acid. The use of a medium-chain fatty acid and a terpenoid as precursors of the extraction solvent promotes the mass transfer of melamine through strong interactions between carboxyl and amino groups. The optimized procedure allows for the fast, miniaturized, and repeatable determination of melamine in real samples of powdered and whole milk, with a wide range of determined concentrations and low detection limit.
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
(2023)
Article
Spectroscopy
Vlasta Mohacek-Grosev, Sandro Brljafa, Marko Skrabic, Ivan Maric, Vesna Blazek Bregovic, Vincenzo Amendola, Polona Ropret, Anita Kvacek Blazevic
Summary: The study investigated the binding of glucosamine to colloidal gold nanoparticles through various techniques including SERS, DLS, and UV-VIS spectroscopy. The results showed that the addition of glucosamine led to an increase in both the size and hydrodynamic diameter of the gold nanoparticles, with different concentrations of glucosamine displaying distinct Raman peaks.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Physical
Oana Andreea Lazar, Anastas Savov Nikolov, Calin Constantin Moise, Sabrina Rosoiu, Mariana Prodana, Marius Enachescu
Summary: This study presents the synthesis of platinum nanoparticles (Pt-NPs) using pulsed laser ablation in aqueous ethanol solution. The optical and morphological properties of the Pt-NPs were investigated by varying the laser fluence, repetition rate, and ethanol concentrations. The results revealed that the synthesized Pt-NPs had mean size values in the range of 1.7-2.45 nm and a certain level of aggregation.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Analytical
Joanna Kosman, Krzysztof Zukowski, Andrea Csaki, Wolfgang Fritzsche, Bernard Juskowiak
Summary: In this study, we investigated the effect of a DNA oligonucleotide sequence on the activity of a DNAzyme with covalently attached hemin. We developed a sandwich assay for detecting DNA sequences using the DNAzyme, which proved to be selective and versatile.
Article
Multidisciplinary Sciences
Stephan Kastner, Pia Pritzke, Andrea Csaki, Wolfgang Fritzsche
Summary: The immobilization chemistry choice in gold nanoparticle LSPR-based bioanalytics can influence the sensitivity of the analysis. Experimental results showed that the LSPR shift triggered by the binding event decreases with increasing distance to the gold surface.
SCIENTIFIC REPORTS
(2022)
Article
Spectroscopy
Faten Farouk, Shereen Essam, Amany Abdel-Motaleb, Rana El-Shimy, Wolfgang Fritzsche, Hassan Mohamed El-Said Azzaz
Summary: A comprehensive assay utilizing FTIR and spectral classification algorithm was developed for fast and accurate detection of bacterial contamination in fresh produce. The procedure involved sample soaking, magnetic nanoparticles capturing, and FTIR scanning, followed by comparison with a bacterial species database. The developed method demonstrated excellent accuracy in detecting bacterial contamination in market samples.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Parijat Barman, Abhik Chakraborty, Denis A. Akimov, Ankit Kumar Singh, Tobias Meyer-Zedler, Xiaofei Wu, Carsten Ronning, Michael Schmitt, Juergen Popp, Jer-Shing Huang
Summary: Plasmonic gratings with spatially resolved broadband momentum were used to investigate plasmonic enhancement effects in two nonlinear optical processes, TPPL and SHG. The experimental spatial distributions of nonlinear signals agreed well with analytical predictions, highlighting the antenna function of the grating in plasmonic nonlinear signal generation.
Article
Chemistry, Physical
Thomas Gottschall, Tobias Meyer-Zedler, Matthias Eibl, Tom Pfeiffer, Hubertus Hakert, Michael Schmitt, Robert Huber, Andreas Tunnermann, Jens Limpert, Juergen Popp
Summary: Coherent Raman scattering microscopy utilizing bioorthogonal tagging approaches allows for targeted monitoring of small molecules in biological samples. To fully exploit this technique, a fast tunable laser is needed. The authors present a laser concept without moving parts for simultaneous acquisition of coherent anti-Stokes Raman scattering images at multiple Raman resonances.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Review
Electrochemistry
Yahia A. A. Yahia, Mohamed W. W. Tawfik, Wolfgang Fritzsche, Hassan M. E. Azzazy
Summary: This review classifies interleukin electrochemical biosensors developed since 2015 into noble metals, ceramics, and carbon-based materials based on the material of the working electrode. The advantages and limitations of each material are discussed and compared, including hybrid ones. Additionally, the designs and performance criteria of these biosensors are compared.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Ekaterina Podlesnaia, Princess Gerald Inangha, James Vesenka, Martin Seyring, Hans-Juergen Hempel, Markus Rettenmayr, Andrea Csaki, Wolfgang Fritzsche
Summary: Nanoparticle synthesis has received significant attention in recent decades, particularly in the study of crystal growth mechanisms and optimization of existing methods. This study reports a novel synthesis of gold nanotriangles using a micromixer, which allows for efficient mixing and simple parameter control. The impact on seed characteristics and subsequent growth steps are investigated, resulting in well-defined triangles with a narrower size distribution compared to conventional batch synthesis. Additionally, the need for a thorough study of seed crystallinity and further parameter optimization using micromixers is emphasized for scaling up nanomaterial production.
Article
Chemistry, Multidisciplinary
Stephan Kastner, Anne-Kathrin Dietel, Florian Seier, Shaunak Ghosh, Daniel Weiss, Oliwia Makarewicz, Andrea Csaki, Wolfgang Fritzsche
Summary: The need for rapid, simple, and accurate bioassays for nucleic acid detection has increased in recent years. This study utilized localized surface plasmon resonance (LSPR) spectroscopy to detect the antimicrobial resistance gene, sulfhydryl variable beta-lactamase (blaSHV), which confers resistance against a broad spectrum of beta-lactam antibiotics. The system was able to detect a 23 nucleotide DNA sequence at a limit of 25 nm, with signal intensity inversely correlated to sequence length. It was also capable of real-time monitoring and distinguishing single nucleotide polymorphism (SNP) variants of blaSHV.
Article
Biochemical Research Methods
Rola Houhou, Elsie Quansah, Tobias Meyer-zedler, Michael Schmitt, Franziska Hoffmann, Orlando Guntinas-lichius, Juergen Popp, Thomas Bocklitz
Summary: Biophotonic multimodal imaging techniques are used to study biological samples, but the measurement time increases significantly for high-resolution images. Mathematical methods and artificial intelligence (AI) based approaches were compared in this research to shorten the acquisition time and improve data quality. The AI methods included transfer learning using the pre-trained network DnCNN and training networks using augmented images. Deep learning techniques showed potential in improving image quality and reducing acquisition time. The proposed network had a simpler architecture compared to similar-performing but highly parametrized networks.
BIOMEDICAL OPTICS EXPRESS
(2023)
Article
Engineering, Biomedical
Justyna Anna Niestrawska, Marko Rodewald, Constanze Schultz, Elsie Quansah, Tobias Meyer-Zedler, Michael Schmitt, Juergen Popp, Igor Tomasec, Benjamin Ondruschka, Niels Hammer
Summary: This study examines the link between location-dependent mechanical anisotropy and principal collagen fiber orientation in the human dura mater. The quantitative observation of collagen fiber orientation and dispersion confirms that collagen is highly aligned in the dura mater and that both fiber orientation and dispersion differ depending on the location investigated. These findings provide insight into the previously observed isotropic mechanical behavior and have implications for the mechanical load response and regional functions of the dura mater.
ACTA BIOMATERIALIA
(2023)
Article
Chemistry, Analytical
Edoardo Farnesi, Silvia Rinaldi, Chen Liu, Jonas Ballmaier, Orlando Guntinas-Lichius, Michael Schmitt, Dana Cialla-May, Juergen Popp
Summary: Saliva, as a body fluid, plays an important role in point-of-care medicine for real-time health monitoring and personalized preventative therapy. The combination of SERS and MD simulations can verify the traceability of specific biomarkers in saliva, opening up a new pathway for precision medicine diagnostics.
Article
Chemistry, Multidisciplinary
Julian Hniopek, Josefine Meurer, Stefan Zechel, Michael Schmitt, Martin D. Hager, Juergen Popp
Summary: Stimuli-responsive polymers can switch specific physical properties in response to a change of the environmental conditions, making them useful for applications requiring adaptive materials. A straightforward method using Raman micro-spectroscopy and 2DCOS analysis is presented to study the response behavior of reversible polymers on a molecular level with molecular sensitivity and spatial as well as temporal resolution. This label-free and non-invasive approach allows for the investigation of macroscopic properties alongside the molecular response of the polymer to external stimuli.
Article
Materials Science, Multidisciplinary
Stephan Kastner, Matthias Urban, Anne-Kathrin Dietel, Andrea Csaki, Wolfgang Fritzsche
Summary: This paper introduces a simple and reliable device setup for time-resolved LSPR measurements using inexpensive array sensor chips. Gold nanoparticles are spotted onto glass substrates under different conditions to achieve optimal signal-to-noise ratio. Bulk sensitivity measurements with solutions of varying refractive index and surface sensitivity measurements with layer-by-layer deposition are performed to verify the setup and sensor chips. The presented cost-effective system allows parallel reading of more than 100 spots in a label-free platform, providing an interesting alternative for the development of future on-site diagnostics.
ADVANCED PHOTONICS RESEARCH
(2023)
