Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy最新文献

{"title":"Revolutionizing Escherichia coli detection in real samples with digital SERS aptamer sensor technology","authors":"Mengmeng Wang ,&nbsp;Li Zheng ,&nbsp;Fan Sun ,&nbsp;Qingdan Ye ,&nbsp;Pei Liang ,&nbsp;Kun Pang ,&nbsp;Zihong Ye ,&nbsp;Yufeng Wang","doi":"10.1016/j.saa.2025.126314","DOIUrl":"10.1016/j.saa.2025.126314","url":null,"abstract":"<div><div>Aptamer sensors based on surface-enhanced Raman scattering (SERS) technology have demonstrated great potential in the ultrasensitive and rapid detection of <em>Escherichia coli</em> (<em>E. coli</em>). Herein, this paper presents a digital SERS aptamer sensor. This sensor integrates ordered nanoscale array synthesis technology and digital analysis technology, enabling highly sensitive and rapid bacterial quantification. The ordered monolayer gold nanosphere arrays (Au NS) can form uniform and dense “hot spots” on the silicon wafer due to their uniform spherical structures and narrow gaps. Moreover, digital SERS is adopted to further optimize the signal uniformity so as to achieve precise quantification. The sensor modules are combined together through base pairing. The aptamers labeled with Raman tags are detached from the complementary DNA due to the competition of the target substance, thus realizing the detection of <em>E. coli</em>. The digital SERS aptamer sensor has been verified to possess excellent selectivity and reproducibility. It has a wide dynamic linear detection range from 1.0 * 10¹ to 1.0 * 10⁹ CFU/ml and a detection limit of 0.657 CFU/ml, maintaining excellent specificity even in the presence of mixed bacterial interference. The spiked recoveries in actual samples range from 98.80 % to 99.81 %. Leveraging different aptamers and digital analysis, the sensor holds promise for food safety and environmental monitoring applications.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"339 ","pages":"Article 126314"},"PeriodicalIF":4.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Colorimetric and fluorometric dual-mode sensing of cefadroxil based on peroxidase-like activity of iron and nitrogen co-doped carbon dots","authors":"Shaker T. Alsharif ,&nbsp;Al-Montaser Bellah H. Ali ,&nbsp;Mohamed M. El-Wekil","doi":"10.1016/j.saa.2025.126313","DOIUrl":"10.1016/j.saa.2025.126313","url":null,"abstract":"<div><div>Herein, new iron and nitrogen co-doped carbon dots (NCDs-Fe) were prepared, exhibiting strong peroxidase-mimetic activity and a photoluminescence quantum yield of 28.76 %. In the presence of NCDs-Fe, an oxidative coupling reaction between 4-aminoantipyrine (4-ANP) and cefadroxil (CFD), a phenolic cephalosporin, was facilitated by H₂O₂, resulting in red-colored product with absorbance at 510 nm. The absorbance of this red-colored product increased proportionally with rising CFD concentrations, serving as the basis for the colorimetric measurement. Additionally, the resultant red color ceased the fluorescence of NCDs-Fe at 460 nm, forming the basis of the fluorometric measurement. The variables affecting the synthesis and detection of CFD were carefully optimized. Under optimized conditions, the absorbance values increased with CFD concentrations in the range of 0.05–400 µM, with LOD value of 0.02 µM. For the fluorometric method, the response ratio increased with rising CFD’s concentrations from 0.01 to 400 µM with LOD of 0.004 µM. The NCDs-Fe was applied to detect CFD in real samples, achieving recovery rates of 96.5 % to 104.0 % with RSD values below 4.12 %.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"339 ","pages":"Article 126313"},"PeriodicalIF":4.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A tag-free fluorescent aptasensor for ultrasensitive detection of sulfadimethoxine antibiotic mediated by rolling circle amplified DNA cascades","authors":"Yasaman Solouki ,&nbsp;Zahra Khoshbin ,&nbsp;Abouzar Shafaghi ,&nbsp;Mohammad Ramezani ,&nbsp;Mona Alibolandi ,&nbsp;Khalil Abnous ,&nbsp;Seyed Mohammad Taghdisi","doi":"10.1016/j.saa.2025.126309","DOIUrl":"10.1016/j.saa.2025.126309","url":null,"abstract":"<div><div>Elevated concentrations of sulfadimethoxine (SDM) in food products contribute to the development of bacterial resistance, resulting in a range of health problems for individuals. This background makes it incumbent to develop an efficient and accurate detection method for SDM. Rolling circle amplification (RCA) is an easy operation and highly efficient signal improvement technique that does not require thermal cycling. This study presents a fluorescent aptasensor that operates without labels to detect SDM, utilizing the RCA process. Using the RCA method as the main contributor for signal amplification, a large number of DNA copies is produced in a short time. This allows for the immobilization of SYBR Green (SGI) molecules and a sharp increase in the fluorescence response. Hence, it can be achieved a wide detection range of SDM from 1 pM to 200 nM and an impressive detection limit of 0.238 pM. The aptasensor can successfully monitor SDM in various livestock products and biological samples. This aptasensor offers advantages such as a short fabrication time, cost-effectiveness, and user-friendliness. It can be promoted as a convenient and economic portable testing kit.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"339 ","pages":"Article 126309"},"PeriodicalIF":4.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Combining Vis-NIR and NIR hyperspectral imaging techniques with a data fusion strategy for rapid and nondestructive determination of multiple nutritional qualities in flaxseed","authors":"Dongyu Zhu ,&nbsp;Junying Han ,&nbsp;Chengzhong Liu ,&nbsp;Jianping Zhang ,&nbsp;Yanni Qi","doi":"10.1016/j.saa.2025.126306","DOIUrl":"10.1016/j.saa.2025.126306","url":null,"abstract":"<div><div>Protein, oil content, stearic acid, linolenic acid, and linoleic acid are key indicators for evaluating the quality of flaxseed in order to optimize the detection method of nutritional quality of flaxseed and to improve the efficiency of the screening of high-quality flax germplasm resources. This study integrated visible near-infrared (Vis-NIR) and near-infrared (NIR) hyperspectral imaging to determine protein, oil, stearic acid, linolenic acid, and linoleic acid contents in diverse flaxseed varieties, along with conducting correlation analyses. After seven data preprocessing methods and three feature selection methods, quantitative prediction models were developed using partial least squares regression (PLSR), principal component regression (PCR), support vector regression (SVR), and multiple linear regression (MLR). Experimental results demonstrated that NIR and fused spectral data outperformed Vis-NIR data across all five quality indices. NIR spectroscopy showed optimal performance for predicting oil content (<span><math><mrow><msubsup><mi>R</mi><mrow><mi>p</mi></mrow><mn>2</mn></msubsup></mrow></math></span> = 0.9671, RMSEP = 0.4364 %), linolenic acid (<span><math><mrow><msubsup><mi>R</mi><mrow><mi>p</mi></mrow><mn>2</mn></msubsup></mrow></math></span> = 0.9517, RMSEP = 0.8795 %), and linoleic acid (<span><math><mrow><msubsup><mi>R</mi><mrow><mi>p</mi></mrow><mn>2</mn></msubsup></mrow></math></span> = 0.9458, RMSEP = 0.3037 %). Fused spectral data achieved superior predictions for protein content (<span><math><mrow><msubsup><mi>R</mi><mrow><mi>p</mi></mrow><mn>2</mn></msubsup></mrow></math></span> = 0.9712, RMSEP = 0.2360 %) and stearic acid (<span><math><mrow><msubsup><mi>R</mi><mrow><mi>p</mi></mrow><mn>2</mn></msubsup></mrow></math></span> = 0.9195, RMSEP = 0.3454 %). And the spatial distribution of flaxseed’s internal nutrient contents was also visualized by map. The results showed that the NIR and fusion spectral sets could be successfully used to evaluate multiple nutritional qualities of flaxseed, which provides a new option for nondestructive determination of the nutritional qualities of flaxseed in the future.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"340 ","pages":"Article 126306"},"PeriodicalIF":4.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the composition of the layer formed on Au NRs by NADH reduction and its application in SERS detection of Cu2+","authors":"Xinyu Lan,&nbsp;Guojun Weng,&nbsp;Jianjun Li,&nbsp;Jian Zhu,&nbsp;Junwu Zhao","doi":"10.1016/j.saa.2025.126312","DOIUrl":"10.1016/j.saa.2025.126312","url":null,"abstract":"<div><div>Surface metal deposition is an important method for tuning the optical property of plasmonic nanoparticles. In this work, we tried to deposit Cu shell on the surface of gold nanorods (Au NRs) by dihydronicotinamide adenine dinucleotide (NADH)-mediated reaction. Cu²⁺ were reduced to Cu⁰ through the gold-catalyzed oxidization of NADH. The deposition of Cu shell onto the Au NRs surface resulted in the obvious red-shift of longitudinal localized surface plasmon resonance peak. And the red-shift of longitudinal peak increased with the concentrations of NADH and Cu²⁺. The TEM images showed that a transparent layer structure with a different contrast around Au NRs was clearly displayed. And this transparent layer structure with the low contrast was generally considered to be pure Cu shell. However, the results from energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS) indicated that the transparent layer was not just pure Cu composition, but contained NADH/NAD⁺ and Cu²⁺ components. This grown complex dielectric shell resulted in the reduced surface enhanced Raman scattering (SERS) activity of Au NRs. Based on the decreased SERS intensity, we demonstrated a SERS method for Cu²⁺ detection using R6G as Raman reporter. The decreased SERS intensity had a linear correlation with the concentration of Cu²⁺ in the range of 10⁻⁶–10⁻² M, with a detection limit of 3.89 × 10⁻⁶ M. This study provides new insights about Cu deposition on Au NRs, which will further promote the spectral sensing applications with gold-catalyzed Cu²⁺ reduction on plasmonic nanoparticles by NADH.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"340 ","pages":"Article 126312"},"PeriodicalIF":4.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced detection of pesticides: evaluating monocarbamoylcarboxylic acids modified with amines for glyphosate and dicamba sensitivity","authors":"Christian Leonardo Castro-Riquelme ,&nbsp;Eduardo Alberto López-Maldonado ,&nbsp;Adrián Ochoa-Terán ,&nbsp;Georgina Pina-Luis ,&nbsp;N. Nthunya Lebea","doi":"10.1016/j.saa.2025.126315","DOIUrl":"10.1016/j.saa.2025.126315","url":null,"abstract":"<div><div>In this work a series of monocarbamoylcarboxylic acids (MCCAs) <em>N</em>-functionalized with different amines were evaluated to detect the pesticides glyphosate (Gly) and dicamba (Dic). The MCCAs have molar absorptivity coefficients (ε) three orders of magnitude higher than pesticides facilitating the measurements under UV–Vis spectroscopy. These compounds have the isolectric point (IEP) in the range of pH 3.04–4.82 and beyond are negative charged. The absorption properties of the compounds are pH-dependent due to the protonation and deprotonation of their molecules, the adsorption band shifts to a longer wavelength as the pH increases and in some ligands a hyperchromic effect is observed. The titration of MCCAs with a pesticide generates a change in the adsorption band and the sensitivity of the response is also pH-dependent. The sensitivity of MCCAs towards pesticides decreased at pH 5.0 and increased at pH 7.0 and 9.0 which is clearly influenced by the acid-base equilibriums in water. The response was more sensitive towards dicamba than with glyphosate, exhibiting linear concentration intervals up to 100 µM with <strong>1a</strong> at pH 4 and 85 µM in compounds <strong>2b</strong> and <strong>2c</strong> at pH 7.0. The ¹H NMR analysis in DMSO‑<em>d₆</em> of compounds <strong>2a</strong> and <strong>2c</strong> in presence of glyphosate and dicamba showed changes in the hydrogen signals indicating the interaction of these MCCAs with the pesticides in specific sites of their molecules. These MCCAs, proved to be promising molecular platforms for the optical detection of glyphosate and dicamba due to their pH-adjustable sensitivity and their ability to show significant electrostatic interactions, enabling pesticide detection over a wide concentration range.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"340 ","pages":"Article 126315"},"PeriodicalIF":4.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing male fertility diagnostics with seminal plasma Raman spectroscopy","authors":"Elena Rimskaya ,&nbsp;Alexey Gorevoy ,&nbsp;Aleksandra Yakimova ,&nbsp;Natalia Makarova ,&nbsp;Natalia Starodubtseva ,&nbsp;Sergey Kudryashov ,&nbsp;Ruslan Nazarenko ,&nbsp;Elena Kalinina ,&nbsp;Vladimir Frankevich ,&nbsp;Gennady Sukhikh","doi":"10.1016/j.saa.2025.126237","DOIUrl":"10.1016/j.saa.2025.126237","url":null,"abstract":"<div><div>Seminal plasma (SP) constitutes approximately 95% of the ejaculate volume and plays a crucial role in modulating sperm function. The analysis of SP through Raman spectroscopy provides valuable insights into the molecular composition of its constituents, offering the potential for enhanced diagnostic approaches in male fertility assessment. In this pilot study, we obtained in vitro Raman spectra from 70 dried SP samples in the range from 400 to 1900 <span><math><mi>cm</mi></math></span>^-1 using a laser excitation wavelength of 532 nm. We employed Multivariate Curve Resolution (MCR) analysis and decomposed the Raman spectra into three key components: tyrosine, spermine phosphate hexahydrate, and a protein-rich component. We identified notable differences in the Raman spectra of normal and abnormal samples, particularly in peak intensities at 625, 1440, and 1008 <span><math><mi>cm</mi></math></span>^-1 providing reliable criteria for differentiation with a specificity of 79% and sensitivity of 95%. The high classification rates achieved in this study not only confirm the efficacy of Raman spectroscopy as a diagnostic tool but also suggest that it could be pivotal in uncovering molecular-level abnormalities that standard semen analysis may overlook. Based on our literature review, this is the first study that highlights the biochemical distinctions between normal and abnormal SP samples in accordance with the criteria established by the World Health Organization (WHO), which includes factors such as sperm count, progressive motility, and normal morphology. Our findings contribute to the growing body of knowledge surrounding male infertility diagnostics and emphasize the necessity for innovative approaches in understanding and addressing reproductive health challenges.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"340 ","pages":"Article 126237"},"PeriodicalIF":4.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143911930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tryptanthrin incorporated spiropiperidine derivative as a fluorescent chemosensor for picric acid detection","authors":"Haitham K.R. Al-Sharifi ,&nbsp;Devika Krishnan ,&nbsp;E.G. Jayasree ,&nbsp;Ani Deepthi","doi":"10.1016/j.saa.2025.126311","DOIUrl":"10.1016/j.saa.2025.126311","url":null,"abstract":"<div><div>The photophysical properties of a previously synthesized tryptanthrin incorporated spiropiperidine molecule (CTSP) is described. Studies revealed that the fluorescence of the compound gets significantly quenched by addition of picric acid (PA). The selectivity, anti-interference and quenching mechanistic studies are also described. The quenching mechanism was largely attributed to photo-induced electron transfer (PET) process facilitated by a strong electrostatic interaction between the protonated NH₂ group of CTSP and PA. Additionally, pH variations significantly influenced the quenching efficiency, with the highest response observed at neutral pH. These findings demonstrate that CTSP is a promising candidate for PA detection, with potential applications in environmental monitoring and security fields.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"339 ","pages":"Article 126311"},"PeriodicalIF":4.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hyperspectral inversion of soil organic matter based on improved ensemble learning method","authors":"Junjie Liu ,&nbsp;Yongsheng Hong ,&nbsp;Bifeng Hu ,&nbsp;Songchao Chen ,&nbsp;Jia Deng ,&nbsp;Keyang Yin ,&nbsp;Jiao Lin ,&nbsp;Defang Luo ,&nbsp;Jie Peng ,&nbsp;Zhou Shi","doi":"10.1016/j.saa.2025.126302","DOIUrl":"10.1016/j.saa.2025.126302","url":null,"abstract":"<div><div>Soil organic matter (SOM) is a vital component of soil, and its rapid and accurate detection is crucial for ensuring land health and stabilizing atmospheric carbon dioxide levels. Soil hyperspectroscopy has demonstrated its efficiency and cost-effectiveness as a method for detecting SOM. In the field of soil spectroscopy, the Ensemble Model (EM) holds substantial promise due to its robust nature and strong generalization capabilities. However, the efficacy of EM is largely contingent upon the judicious selection of the base learner count and the strategic allocation of weights. Traditional practices is mainly relying on empirical weight distribution or a singular index, <em>R²</em>, of the base learners, with scant clarity on the optimal base learner count for varying ensemble techniques. To address this gap, our study utilizes Vis-NIR spectroscopy to quantitatively assess SOM across 704 samples from the Tarim River Basin in Xinjiang, China. Our objective is to innovate base learner weight assignment methods and identify the differing optimal counts of EM base learners, thereby refining the ensemble approach and augmenting EM performance. Subsequently, we examined the impact of various weight coefficient assignment methods and base learner counts on EM performance within Weighted Averaging (WA), Blending, and Stacking frameworks. Our findings reveal that a weight coefficient assignment method incorporating <em>R²</em>, <em>RMSE</em>, and <em>MAE</em> significantly enhances EM performance. This improvement surpasses traditional methods relying solely on base learner <em>R²</em>, yielding an increased EM <em>R²</em> of 0.006–0.024, with reductions in <em>RMSE</em> and <em>MAE</em> by 0.014–0.085 g kg⁻¹ and 0.03–0.085 g kg⁻¹, respectively. Though the number of base learners is crucial, it does not establish a linear relationship; an increase does not invariably translate to enhanced performance. Notably, when the base learner count is 12, Blending and Stacking exhibit peak performance, whereas WA’s precision continues to ascend with 15 base learners. Among the ensemble methods, Stacking demonstrates the highest precision, achieving a validation <em>R²</em> of 0.889, <em>RMSE</em> of 0.957 g kg⁻¹, and <em>MAE</em> of 0.803 g kg⁻¹. In summary, configuring the base learner count to 12 and employing a multi-index comprehensive evaluation for weight assignment within the Stacking method emerges as the optimal integration strategy for SOM hyperspectral inversion.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"339 ","pages":"Article 126302"},"PeriodicalIF":4.3,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fluorometric/colorimetric dual-mode sensor based on silicon quantum dots for rapid and on-site detection of tert-butyl hydroquinone","authors":"Yue Huang ,&nbsp;Feifan Cheng ,&nbsp;Danling Mei,&nbsp;Meichun Chen,&nbsp;Xueqin Zhao,&nbsp;Biao Huang","doi":"10.1016/j.saa.2025.126303","DOIUrl":"10.1016/j.saa.2025.126303","url":null,"abstract":"<div><div>Tert-butyl hydroquinone (TBHQ) is a synthetic phenolic antioxidant commonly found in food. The overuse of TBHQ poses a potential toxicity to human health, which has attracted significant attention in food safety. In this study, we developed a dual-mode test platform strategy centered on silicon quantum dots (SiQDs) for fluorometric/colorimetric TBHQ detection. The SiQDs with Fe (III) as the fluorescence switch and co-enzyme, were synthesized and characterized, facilitating the catalysis of TBHQ to 2-<em>tert</em>-butyl-1,4-benzoquinone (TBBQ). There was a linear correlation with TBHQ concentration in the range of 5–200 μM, with a limit of detection (LOD) of 0.12 μM. Furthermore, with the assistance of 3,3′,5,5′-tetramethylbenzidine (TMB) as a chromogenic substrate, the nanoprobes exhibited good colorimetric detection performance for TBHQ, with an LOD of 7 μM in the 15–500 μM range. Moreover, smartphone-integrated agarose gel strips were successfully developed for simple TBHQ detection with naked-eyes and the quantitative analysis with a LOD of 15 μM. The fabricated sensors successfully monitored TBHQ levels in spiked edible oil samples with recoveries in the range of 89.05–109.61 % and relative standard deviations (RSDs, %) less than 1.75 %, suggesting applicability for the detection of TBHQ in a complex food matrix.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"339 ","pages":"Article 126303"},"PeriodicalIF":4.3,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}