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

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Feasibility and potential of terahertz spectral and imaging technology for Apple Valsa canker detection: A preliminary investigation 太赫兹光谱和成像技术用于苹果溃疡病检测的可行性和潜力:初步调查
IF 4.3 2区 化学
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-10-22 DOI: 10.1016/j.saa.2024.125308
Yibo Zhou , Xiaohui Wang , Keming Chen , Chaoyue Han , Hongpu Guan , Yan Wang , Yanru Zhao
{"title":"Feasibility and potential of terahertz spectral and imaging technology for Apple Valsa canker detection: A preliminary investigation","authors":"Yibo Zhou ,&nbsp;Xiaohui Wang ,&nbsp;Keming Chen ,&nbsp;Chaoyue Han ,&nbsp;Hongpu Guan ,&nbsp;Yan Wang ,&nbsp;Yanru Zhao","doi":"10.1016/j.saa.2024.125308","DOIUrl":"10.1016/j.saa.2024.125308","url":null,"abstract":"<div><div>Apple Valsa canker (AVC) caused by the Ascomycete <em>Valsa mali</em>, seriously constrains the production and quality of apple fruits. The symptomless incubation characteristics of <em>Valsa mali</em> make it highly challenging to detect AVC at an early infection stage. After infecting the wound of apple bark, the pathogenic hyphae of AVC will expand and colonize the phloem tissue. Meanwhile, various enzymes and toxic substances released by hyphae cause the decomposition of cellulose and lignin, and the generation of poisonous secondary metabolites in bark tissue. However, these early symptoms of AVC are invisible from the bark’s appearance. Fortunately, Terahertz Spectral Imaging (ThzSI) technology with the advantage of penetrating, and fingerprinting is promising for detecting hidden or slight symptoms of the fungal infection. This study is a preliminary investigation of terahertz frequency-domain spectra for AVC in the early stage of infection. Healthy and two-week-infected apple tree branches were prepared for capturing ThzS images, and the spectral data were preprocessed by Multivariate scattering correction (MSC), Savitzky-Golay convolution smoothing (SG), and standard normal variate (SNV) respectively to remove data noise and improve data quality. Principal component analysis (PCA), competitive adaptive reweighted sampling (CARS), and random frog (RFROG) were employed to extract the spectral feature bands to eliminate redundant data and improve computational efficiency. Machine learning models were established based on the spectral features to detect AVC at an early infection stage, where 11 of them exhibited the best performance with F1-score of 99.72%. To further explore disease information in spatial spectra, imaging data were acquired using terahertz imaging technology. Based on imaging data, pseudo-color imaging, histogram equalization, and Otsu segmentation were employed to visualize early infection areas in apple barks. Furthermore, histogram feature (HF), shape feature (SF), and local binary pattern (LBP) extracted from terahertz spectral images were utilized to establish the SVM, RF, and KNN models. HF-SF-KNN and HF-SF-LBP-KNN with the best performance achieved F1-score of 98.82%. This study presents a preliminary application of terahertz spectral and imaging technology for early-stage AVC detection and demonstrates its feasibility. Additionally, it provides a new way to detect AVC, which expands the application of ThzSI technology in tree disease detection in orchards and lays the foundation for further research.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"327 ","pages":"Article 125308"},"PeriodicalIF":4.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526715","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}
引用次数: 0
Spectroscopic characterization of triazine based covalent organic framework tempted changes in the structure of hemoglobin 基于三嗪的共价有机框架的光谱特性诱导血红蛋白结构的变化
IF 4.3 2区 化学
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-10-22 DOI: 10.1016/j.saa.2024.125320
Nitanshu Dhama , Karan Chaudhary , Rohit Yadav , Dhanraj T. Masram
{"title":"Spectroscopic characterization of triazine based covalent organic framework tempted changes in the structure of hemoglobin","authors":"Nitanshu Dhama ,&nbsp;Karan Chaudhary ,&nbsp;Rohit Yadav ,&nbsp;Dhanraj T. Masram","doi":"10.1016/j.saa.2024.125320","DOIUrl":"10.1016/j.saa.2024.125320","url":null,"abstract":"<div><div>The present study aims to understand changes in the Hemoglobin (Hb) structure in the presence of a triazine based covalent organic framework (COF) through spectroscopic characterization. Covalent Organic Frameworks (COFs) due to their unique properties have been utilized in diverse fields including bio-applications. Utilization of COFs for conjugate formation with proteins will lead to the integration of biology and framework materials that can help in the development of bioconjugates for advanced bio-based applications such as diagnostics, therapeutics, and bioengineering. However, vital is to have a fundamental understanding of protein conformation in protein-COF conjugate. Herein, a triazine based COF has been synthesized via solvothermal method, termed TATF-COF which has been utilized for the formation of a conjugate with hemoglobin (Hb). Thereafter, studies have been performed to understand Hb structure in the presence of TATF-COF. Results from UV–vis, Fluorescence, and UV-CD spectroscopy studies revealed that in the presence of TATF-COF, there was a slight alteration in the Hb structure due to binding interactions between them and conjugate formation. Moreover, micrographs obtained from electron microscopy displayed formation of conjugate between Hb and TATF-COF result of binding interactions. DLS and zeta potential results also revealed conjugate formation due to binding interactions between TATF-COF and Hb. Thermal stability of Hb was also maintained as TATF-COF had insignificant effect on the T<sub>m</sub> value of Hb. Overall, there was a slight alternation in the Hb native conformation due to binding interactions, however, TATF-COF was compatible with Hb as the protein’s native structure was well-preserved.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"327 ","pages":"Article 125320"},"PeriodicalIF":4.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526489","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}
引用次数: 0
Fourier transform InfraRed spectra analyzed by multivariate and machine learning methods in determination spectroscopy marker of prostate cancer in dried serum 用多元和机器学习方法分析傅立叶变换红外光谱,确定干血清中前列腺癌的光谱标志物
IF 4.3 2区 化学
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-10-22 DOI: 10.1016/j.saa.2024.125305
Przemysław Mitura , Wiesław Paja , Bartosz Klebowski , Paweł Płaza , Iga Kuliniec , Krzyszof Bar , Joanna Depciuch
{"title":"Fourier transform InfraRed spectra analyzed by multivariate and machine learning methods in determination spectroscopy marker of prostate cancer in dried serum","authors":"Przemysław Mitura ,&nbsp;Wiesław Paja ,&nbsp;Bartosz Klebowski ,&nbsp;Paweł Płaza ,&nbsp;Iga Kuliniec ,&nbsp;Krzyszof Bar ,&nbsp;Joanna Depciuch","doi":"10.1016/j.saa.2024.125305","DOIUrl":"10.1016/j.saa.2024.125305","url":null,"abstract":"<div><div>Prostate cancer represents the second most prevalent form of cancer in males globally. In the diagnosis of prostate cancer, the most commonly utilised biomarker is prostate-specific antigen (PSA). It is unfortunate that approximately 25 % of men with elevated PSA levels do not have cancer, and that approximately 20 % of patients with prostate cancer have normal serum PSA levels. Accordingly, a more sensitive methodology must still be identified. It is imperative that new diagnostic methods should be non-invasive, cost-effective, rapid, and highly sensitive. Fourier transform infrared spectroscopy (FTIR) is a technique that fulfils all of the aforementioned criteria. Consequently, the present study used FTIR to assess dried serum samples obtained from a cohort of prostate cancer patients (n = 53) and a control group of healthy individuals (n = 40). Furthermore, this study proposes FTIR markers of prostate cancer obtained from serum. For this purpose, FTIR spectra of dried serum were measured and analysed using statistical, chemometric and machine learning (ML) algorithms including decision trees C5.0, Random Forest (RF), k-Nearest Neighbours (kNN) and Support Vector Machine (SVM). The FTIR spectra of serum collected from patients suffering from prostate cancer exhibited a reduced absorbance values of peaks derived from phospholipids, amides, and lipids. However, these differences were not statistically significant. Furthermore, principal component analysis (PCA) demonstrated that it is challenging to distinguish serum samples from healthy and non-healthy patients. The ML algorithms demonstrated that FTIR was capable of differentiating serum collected from both analysed groups of patients with high accuracy (values between 0.74 and 0.93 for the range from 800 cm<sup>−1</sup> to 1800 cm<sup>−1</sup> and around 0.70 and 1 for the range from 2800 cm<sup>−1</sup> to 3000 cm<sup>−1</sup>), depending on the ML algorithms used. The results demonstrated that the peaks at 1637 cm<sup>−1</sup> and 2851 cm<sup>−1</sup> could serve as a FTIR marker for prostate cancer in serum samples. Furthermore, the correlation test indicated a clear correlation between these two wavenumbers and four of the five clinical parameters associated with prostate cancer. However, the relatively small number of samples collected only from patients over the age of 60 indicated that the results should be further investigated using a larger number of serum samples collected from a mean age range. In conclusion, this study demonstrated the potential of FTIR for the detection of prostate cancer in serum samples, highlighting the presence of distinctive spectroscopic markers associated with the analysed cancer type.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"327 ","pages":"Article 125305"},"PeriodicalIF":4.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526496","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}
引用次数: 0
Enhancing soil nitrogen measurement via visible-near infrared spectroscopy: Integrating soil particle size distribution with long short-term memory models 通过可见光-近红外光谱加强土壤氮素测量:将土壤粒径分布与长短期记忆模型相结合
IF 4.3 2区 化学
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-10-22 DOI: 10.1016/j.saa.2024.125317
Xiangchao Fu , Geng Leng , Zeyuan Zhang , Jingyun Huang , Wenbo Xu , Zhenwei Xie , Yuewu Wang
{"title":"Enhancing soil nitrogen measurement via visible-near infrared spectroscopy: Integrating soil particle size distribution with long short-term memory models","authors":"Xiangchao Fu ,&nbsp;Geng Leng ,&nbsp;Zeyuan Zhang ,&nbsp;Jingyun Huang ,&nbsp;Wenbo Xu ,&nbsp;Zhenwei Xie ,&nbsp;Yuewu Wang","doi":"10.1016/j.saa.2024.125317","DOIUrl":"10.1016/j.saa.2024.125317","url":null,"abstract":"<div><div>Good quality of soil nitrogen data, which is essential for the advancement of both enhanced agricultural management and ecological environment, traditionally depends on labor intensive chemical procedures. Visible near-infrared (Vis-NIR) spectroscopy, acknowledged for its efficiency, environmental compatibility and rapidity, merges as a promising alternative. However, the effectiveness of Vis-NIR measurement models are significantly compromised by soil particle size distribution (PSD), presenting a substantial challenge in improving the measurement accuracy and reliability. Here an innovative deep learning methodology that integrates PSD with Vis-NIR spectroscopy was proposed for the measurement of nitrogen content in soil samples. By leveraging the LUCAS dataset, different strategies for integrating PSD with Vis-NIR spectral data in deep learning models were explored, revealing that our proposed InSGraL framework, which incorporated mixed features of PSD and spectra as LSTM inputs achieves superior performance. Compared to models utilizing solely Vis-NIR data, InSGraL exhibits a 39.47 % reduction in RMSE and a 42.55 % decrease in MAE, and demonstrates robust performance across various land cover types, achieving an R<sup>2</sup> of 0.94 on grassland samples. Moreover, Shapley Additive exPlanations (SHAP) analysis revealed that incorporating PSD modifies the spectral input importance distribution, effectively mitigating spectral interference from particle size while highlighting critical wavelengths previously obscured. This study provides an innovative modeling strategy to mitigate the influence of PSD by integrating it within deep learning framework using Vis-NIR, contributing a deeper understanding of the relationship between PSD and Vis-NIR spectra for the measurement of nitrogen content and offering an effective means to attain soil nitrogen data.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"327 ","pages":"Article 125317"},"PeriodicalIF":4.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538434","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}
引用次数: 0
Synthesis and mechanistic investigation of BPA fluorescent probes targeting BPA for potential application in Boron Neutron Capture Therapy (BNCT) 针对硼中子俘获疗法(BNCT)中潜在应用的双酚 A(BPA)荧光探针的合成与机理研究
IF 4.3 2区 化学
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-10-22 DOI: 10.1016/j.saa.2024.125318
Wenwen Sun , Yuanfeng Qi , Le Wang , Yunpeng Tan , Xiao Zhang , Junfeng Wang , Yingbo Li
{"title":"Synthesis and mechanistic investigation of BPA fluorescent probes targeting BPA for potential application in Boron Neutron Capture Therapy (BNCT)","authors":"Wenwen Sun ,&nbsp;Yuanfeng Qi ,&nbsp;Le Wang ,&nbsp;Yunpeng Tan ,&nbsp;Xiao Zhang ,&nbsp;Junfeng Wang ,&nbsp;Yingbo Li","doi":"10.1016/j.saa.2024.125318","DOIUrl":"10.1016/j.saa.2024.125318","url":null,"abstract":"<div><div>Boronic acid analogs are crucial in modern organic chemistry and drug development, serving as versatile reagents and intermediates with significant therapeutic applications. This area has gained increased interest with the recent development of the drug 4-boron-L-phenylalanine (L-BPA) for boron neutron capture therapy (BNCT). Fluorescent probe technology offers an essential pathway for imaging drugs in vitro and in vivo, providing high sensitivity with great spatial and temporal resolution for both disease diagnosis and drug development. In this paper, we designed and investigated three fluorescent probes—W-1-NN, W-2-NS and W-3-NO—for sensing 4-boron-L-phenylalanine (L-BPA). Among these, only W-1-NN reacts with L-BPA, resulting in a spectral blue-shift change. This probe can “ratiometrically” and specifically detect L-BPA among various metals, with a limit of detection (LOD) of 7.11 μM. Mechanistic studies revealed that the addition of L-BPA disrupts the inherent ESIPT mechanism of W-1-NN in protonic solutions, resulting in the appearance of a new peak at 372 nm. Additionally, theoretical computational studies have also demonstrated that the complexation of W-1-NN with L-BPA triggers a change in the resonance structure, resulting in a larger energy gap and causing a blue shift in the spectrum. Furthermore, W-1-NN has been successfully applied to the detection of L-BPA in human urine. Therefore, the template probe with N/O as the target and the introduction of N atoms can specifically detect L-BPA. This template probe lays the foundation for the detection of L-BPA, and provides great possibilities for the future realization of the template probe to be connected with different fluorophores to make it emit at long wavelengths to reach the target of the near-infrared.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"327 ","pages":"Article 125318"},"PeriodicalIF":4.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537793","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}
引用次数: 0
New phenanthridine-based multi-functional chemosensor for selective detection of Th4+ and Hg2+ ions in both aqueous and solid state 基于菲啶的新型多功能化学传感器,用于在水溶液和固体状态下选择性检测 Th4+ 和 Hg2+ 离子
IF 4.3 2区 化学
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-10-21 DOI: 10.1016/j.saa.2024.125312
Bharathkumar Thangaraj , Sambath Baskaran , Ravichandran Cingaram , Sathiyanarayanan Kulathu Iyer , Karthikeyan Natesan Sundaramurthy
{"title":"New phenanthridine-based multi-functional chemosensor for selective detection of Th4+ and Hg2+ ions in both aqueous and solid state","authors":"Bharathkumar Thangaraj ,&nbsp;Sambath Baskaran ,&nbsp;Ravichandran Cingaram ,&nbsp;Sathiyanarayanan Kulathu Iyer ,&nbsp;Karthikeyan Natesan Sundaramurthy","doi":"10.1016/j.saa.2024.125312","DOIUrl":"10.1016/j.saa.2024.125312","url":null,"abstract":"<div><div>A new phenanthridine-based multifunctional chemosensor (L), was synthesised via a green synthetic route and characterised using FT-IR, NMR and HRMS analysis. The sensing application of L towards metal ions in both solution and solid-state was studied using UV–vis and fluorescence spectroscopy, which exhibits dual-sensing behaviour for Th<sup>4+</sup> and Hg<sup>2+</sup> ions with good recyclability. In aqueous acetonitrile, L showed rapid response for the detection of environmental toxic metal ions and has a very low analytical detection limit of 125.5 pM and 1.94 nM for Th<sup>4+</sup> and Hg<sup>2+</sup>ions respectively, which is remarkably lower than the World Health Organization standard. The cation binding property of the L with Th<sup>4+</sup> and Hg<sup>2+</sup>ions was investigated by Job plot, <sup>1</sup>H NMR titration, HR-MS and DFT calculation. The in-situ formed ensemble L-Hg<sup>2+</sup> was further applied in the naked-eye detection of Cys (Cystine) and His (Histidine) over other common amino acids. The utility of L for real-time detection of Hg<sup>2+</sup> and Th<sup>4+</sup> ions was explored in various sources of environmental water samples, test paper strips, fingerprint imaging, fluorescent ink and smartphone-assisted sensing techniques, demonstrating the promising on-site visualization of the probe in controlling the toxicity levels in wastewater sources without resorting to expensive instruments.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"327 ","pages":"Article 125312"},"PeriodicalIF":4.3,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538433","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}
引用次数: 0
Development of a nanobody-horseradish peroxidase fusion-based competitive ELISA to rapidly and sensitively detect Enrofloxacin residues in animal-derived foods 开发基于纳米抗体-辣根过氧化物酶融合的竞争性酶联免疫吸附试验,快速灵敏地检测动物源食品中的恩诺沙星残留量
IF 4.3 2区 化学
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-10-21 DOI: 10.1016/j.saa.2024.125309
Ming Yang , Qiang Xu , Kui Gu , Renqiao Wen , Changyu Zhou , Yu Zhao , Boyan Guo , Wei Xu , Yuanyuan Zhang , Cui Li , Changwei Lei , Hongning Wang
{"title":"Development of a nanobody-horseradish peroxidase fusion-based competitive ELISA to rapidly and sensitively detect Enrofloxacin residues in animal-derived foods","authors":"Ming Yang ,&nbsp;Qiang Xu ,&nbsp;Kui Gu ,&nbsp;Renqiao Wen ,&nbsp;Changyu Zhou ,&nbsp;Yu Zhao ,&nbsp;Boyan Guo ,&nbsp;Wei Xu ,&nbsp;Yuanyuan Zhang ,&nbsp;Cui Li ,&nbsp;Changwei Lei ,&nbsp;Hongning Wang","doi":"10.1016/j.saa.2024.125309","DOIUrl":"10.1016/j.saa.2024.125309","url":null,"abstract":"<div><div>The ability to reliably detect enrofloxacin in animal-derived food products has important health implications. In the present study, a nanobody-horseradish peroxidase fusion specific for ENR was generated to enable a sensitive and rapid competitive ELISA suitable for detecting enrofloxacin in samples of milk and animal tissue. An enrofloxacin hapten generated via the glutaraldehyde method was initially used to immunize an adult Bactrian camel as a means of constructing a phage library. Enrofloxacin−specific nanobodies were then selected through three rounds of biopanning, and HRP-fused versions of these nanobodies were then expressed. Lastly, these nanobodies were used to develop a sensitive cELISA for enrofloxacin detection in milk and animal tissues, with the resultant assay exhibiting an IC<sub>50</sub> of 37.41 ng/mL and a linear detection range (IC<sub>20</sub>-IC<sub>80</sub>) of 10.89 to 244.34 ng/mL. The limit of detection for this cELISA was 6.48 ng/mL, with 4.66 % cross-reactivity with ciprofloxacin, and recovery rates that ranged from84.99 % to 107.72 % together with an RSD below 10.70 %.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"327 ","pages":"Article 125309"},"PeriodicalIF":4.3,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526718","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}
引用次数: 0
The enhancement detection method based on the Fabry–Pérot cavity using terahertz frequency-domain spectroscopy 基于法布里-佩罗腔的太赫兹频域光谱增强检测方法
IF 4.3 2区 化学
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-10-20 DOI: 10.1016/j.saa.2024.125293
Yubo Wu , Kanglong Chen , Ayesha Kosar Fahad , Haorang Wang , Xiaoping Zheng , Cunjun Ruan
{"title":"The enhancement detection method based on the Fabry–Pérot cavity using terahertz frequency-domain spectroscopy","authors":"Yubo Wu ,&nbsp;Kanglong Chen ,&nbsp;Ayesha Kosar Fahad ,&nbsp;Haorang Wang ,&nbsp;Xiaoping Zheng ,&nbsp;Cunjun Ruan","doi":"10.1016/j.saa.2024.125293","DOIUrl":"10.1016/j.saa.2024.125293","url":null,"abstract":"<div><div>This article demonstrates a simple, efficient, and low-cost gas detection method for gases with absorption peaks in the terahertz range. A modes-adjustable Fabry–Pérot cavity is designed. By adjusting the length of the cavity, the center resonant frequency of the cavity can be coupled to the gas absorption peak. This kind of coupling can greatly enhance gas detection. To detect gas absorption peaks, we choose terahertz frequency domain spectroscopy (THz-FDS), whose frequency resolution can be up to the MHz level. Vapor is selected to verify the coupling phenomenon. The resonant frequency of the cavity is modified to couple to 0.56 THz, the absorption peak of vapor. Experiments are conducted at different humidity levels, the humidity is controlled by the supersaturated salt solution. Results indicate that at a humidity level of 15 %, the coupling effect can enhance the detectability of vapor by approximately 167 %, and this enhancement effect diminishes as humidity increases. We analyze the effect of different modes on the coupling and find that the high modes can make the coupling easier, but have little effect on the enhancement. Furthermore, the method is used to detect biomolecule-α-tyrosine to ensure it has wide applicability. This method can be used to detect substances with absorption peaks in the THz regime, especially for low-concentration gas.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"327 ","pages":"Article 125293"},"PeriodicalIF":4.3,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Miniaturized dual-wavelength β-correction spectrophotometric probe for sensitive detection of cyanide in water via formation of cyano dithizone adduct 微型双波长 β 校正分光光度计探针,通过形成氰基二硫腙加合物灵敏检测水中的氰化物
IF 4.3 2区 化学
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-10-20 DOI: 10.1016/j.saa.2024.125314
E.A. Bahaidarah , H. Alwael , M.M. Dabi , T.N. Abduljabbar , F.M. Alshareef , K.A. Alzahrani , N.A. Asiri , N.O. Maslamani , S.O. Bahaffi , M.S. El-Shahawi
{"title":"Miniaturized dual-wavelength β-correction spectrophotometric probe for sensitive detection of cyanide in water via formation of cyano dithizone adduct","authors":"E.A. Bahaidarah ,&nbsp;H. Alwael ,&nbsp;M.M. Dabi ,&nbsp;T.N. Abduljabbar ,&nbsp;F.M. Alshareef ,&nbsp;K.A. Alzahrani ,&nbsp;N.A. Asiri ,&nbsp;N.O. Maslamani ,&nbsp;S.O. Bahaffi ,&nbsp;M.S. El-Shahawi","doi":"10.1016/j.saa.2024.125314","DOIUrl":"10.1016/j.saa.2024.125314","url":null,"abstract":"<div><div>Cyanide toxicity in water significantly threatens public health and the environment. To address this, a miniaturized simple, low-cost, selective and sensitive direct dual wave β-correction spectrophotometric probe has been established for cyanide detection in water. The dual-wavelength β-correction spectrophotometry enhances the selectivity and sensitivity of the probe in the presence of interfering species. The assay relies a highly selective nucleophilic addition of cyanide ions to dithizone (H<sub>2</sub>Dz) as chromogenic reagent in aqueous media of pH 6.8–7.2, forming a red-colored cyano H<sub>2</sub>Dz adduct. The electronic spectrum of the formed adduct displays a sharp absorption peak at λ<sub>max</sub> = 480 nm, enabling precise colorimetric detection. The molar absorptivity and Sandell’s sensitivity index for the cyano H<sub>2</sub>Dz adduct with and without <em>β</em>-correction spectrophotometry were 5.62 × 10<sup>3</sup>, and 1.79 × 10<sup>3</sup> L mol<sup>−</sup><sup>1</sup> cm<sup>−</sup><sup>1</sup>, and 0.002 and 0.0033 µg cm<sup>−</sup><sup>2</sup>, respectively. Beer’s law and Ringbom’s plots are valid in the range 0.01–5.0 and 0.06–2.0 µg mL<sup>−</sup><sup>1</sup> CN<sup>–</sup> concentration, respectively. The limits of detection (LOD) and quantification (LOQ) improved from 1.03 × 10<sup>−1</sup> and 3.13 × 10<sup>−1</sup> μg/mL using ordinary spectrophotometry to 2.8 × 10<sup>−2</sup> and 8.7 × 10<sup>−2</sup> μg mL<sup>−1</sup> employing β-correction spectrophotometry. The probe offers rapid response, good anti-interference ability, reproducibility, and cost-effectiveness. The probe was successfully applied for detection of trace levels of cyanide ions in water with good repeatability. It has been also validated in water samples with good recoveries (99.2 ± 5.02 %). The experimental <em>Student t</em> test (<em>t<sub>exp</sub></em> = 1.2–1.5) was lower than the critical (<em>t<sub>exp</sub> =</em> 2.78) at 95 % probability <em>(</em>n = 5). The stoichiometry and mechanism of formation of the cyano adduct were assigned and addressed.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"327 ","pages":"Article 125314"},"PeriodicalIF":4.3,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537795","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}
引用次数: 0
ATR-FTIR spectroscopic imaging with variable angles of incidence of crude oil deposits formed by flocculant flow 以不同入射角对絮凝剂流动形成的原油沉积物进行 ATR-FTIR 光谱成像。
IF 4.3 2区 化学
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-10-20 DOI: 10.1016/j.saa.2024.125310
Anton S. Shalygin
{"title":"ATR-FTIR spectroscopic imaging with variable angles of incidence of crude oil deposits formed by flocculant flow","authors":"Anton S. Shalygin","doi":"10.1016/j.saa.2024.125310","DOIUrl":"10.1016/j.saa.2024.125310","url":null,"abstract":"<div><div>Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopic imaging is a method for spatially resolved analysis of materials that combines the capabilities of ATR-FTIR spectroscopy with the use of a focal plane array detector. This paper presents the methodological aspects of adapting the ATR accessory with variable single reflection angle to the FTIR spectroscopic imaging method. The use of a variable reflection angle allows the image to be studied at different sample depths. Using examples of BMIMPF<sub>6</sub> ionic liquid and crude oil droplets placed on the working surface of an internal reflection element, the characteristics of image acquisition as the angle of reflection is varied are discussed. The possibility of obtaining crude oil deposits directly on the working surface of the internal reflection element under the influence of a flocculant flow (n-heptane, acetone) and their study by ATR-FTIR spectroscopic image was demonstrated. Crude oil deposits were obtained under different formation conditions (flow rates of flocculant) and their spectroscopic images were also obtained at different single reflection angles. This information gives an indication of the composition of the deposit’s functional groups not only at spatial resolution but also at depth.</div></div>","PeriodicalId":433,"journal":{"name":"Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy","volume":"327 ","pages":"Article 125310"},"PeriodicalIF":4.3,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142515647","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}
引用次数: 0
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