Analytical Methods最新文献

{"title":"Retention time-independent strategy for screening pesticide residues in herbs based on a fingerprint database and all ion fragmentation acquisition with LC-QTOF MS.","authors":"Xiu-Ping Chen, Yu-Han Lu, Bo Xu, Yi-Xin Wei, Xia-Lian Cui, Wen-Wen Zhang, Gang-Feng Xu, Fang Zhang, Chen-Guo Feng","doi":"10.1039/d4ay01273a","DOIUrl":"https://doi.org/10.1039/d4ay01273a","url":null,"abstract":"<p><p>A retention time (RT)-independent strategy for nontargeted screening of pesticide residues in herbs was exploited using liquid chromatography-quadrupole time-of-flight mass spectrometry (LC-QTOF MS). The core of this strategy is a fingerprint database coupled with a data-independent acquisition (DIA) scan mode of all ion fragmentation (AIF). In the fingerprint database, a total of 150 pesticides with quasimolecular ions and fragment ions at five-level collision energies were collected as qualified ions for screening. During the data acquisition, the AIF scan was performed <i>via</i> real unbiased full-spectrum MS/MS acquisition. Six herb matrices spiked with 30 banned pesticides were used to evaluate the applicability of the strategy in real samples. The use of the narrow ion mass extraction window (10 mDa) and the narrow RT window (0.1 min) enabled the effective extraction of spectra from noisy backgrounds and the discovery of suspected pesticides <i>via</i> similarity matching of filtered qualified ions. On average, more than 11/30 of pesticides at 1 ng mL^-1 and more than 23/30 of pesticides at 10 ng mL^-1 or lower could be screened out in each matrix using at least two qualified ions. In addition, the AIF mode exhibited superior anti-interference capability compared to data-dependent acquisition (DDA) and sequential window acquisition of all theoretical mass spectra (SWATH), as determined by comparing the limits of screening (LOSs) of 30 banned pesticides spiked into <i>Isatidis Folium</i>. Finally, the developed strategy was applied to screen pesticide residues in extracts of <i>Ganoderma</i> and <i>Foeniculi Fructus</i>. Phorate-sulfone and phorate-sulfoxide were found in <i>Ganoderma</i>, as well as terbufos-sulfone and terbufos-sulfoxide were found in <i>Foeniculi Fructus</i>. In conclusion, the developed RT-independent strategy based on a fingerprint database and AIF acquisition with LC-QTOF MS seems to be one of the most efficient tools for the analysis of nontargeted pesticide residues in complicated matrices.</p>","PeriodicalId":64,"journal":{"name":"Analytical Methods","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A chemiluminescent sensor based on CRISPR-HCR technology for the hypersensitive detection of <i>Mycobacterium tuberculosis</i>.","authors":"Yinuo Qiao, Xiaoyan Wang, Xuning Kang, Yuzhu Song, Jinyang Zhang, Qinqin Han","doi":"10.1039/d4ay01517g","DOIUrl":"https://doi.org/10.1039/d4ay01517g","url":null,"abstract":"<p><p>Tuberculosis is a highly infectious bacterial disease caused by <i>Mycobacterium tuberculosis</i>. The spread of this agent has caused serious health problems worldwide, and the rapid and accurate detection of <i>M. tuberculosis</i> is essential for controlling the spread of infection and for preventing the emergence of multidrug-resistant strains. In this study, the <i>trans</i> cleavage ability of CRISPR-Cas12a against single-stranded DNA was combined with hybridization chain reaction and chemiluminescent signal to establish an imaging sensor for the hypersensitive detection of <i>M. tuberculosis</i> DNA. We observed linear relationships between the concentration of <i>M. tuberculosis</i> DNA and the output signal over the ranges of 10 to 200 pM and 200 to 800 pM DNA. The equations of the standard curves were <i>y</i> = 56.08<i>x</i> + 3303, with <i>R</i>² = 0.9916 for the lower range and <i>y</i> = 15.69<i>x</i> + 10 685, with <i>R</i>² = 0.9929 for the higher range. The limit of detection was as low as 0.83 pM for genomic DNA, and a plasmid containing an <i>M. tuberculosis</i>-specific sequence was detected at 1 copy per μL. A detection accuracy of 100% was achieved in the analysis of DNA isolated from sputum of hospitalized tuberculosis patients. The sensitivity and specificity of the proposed sensor is combined with a long shelf-life and a low cost of materials. This study introduces a new method for tuberculosis detection and broadens the application of CRISPR-Cas12a-based sensors in clinical diagnosis.</p>","PeriodicalId":64,"journal":{"name":"Analytical Methods","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A numerical platform for predicting the performance of paper-based analytical devices.","authors":"Lawrence K Q Yan, Sze Kee Tam, Ka Ming Ng","doi":"10.1039/d4ay01305k","DOIUrl":"https://doi.org/10.1039/d4ay01305k","url":null,"abstract":"<p><p>This article presents a numerical platform for predicting the performance of paper-based analytical devices. The capillary flow, reaction, dissolution, and other physicochemical phenomena associated with device operation are accounted for using Darcy's law, Richard's equation and other transport equations. The platform can be used for different paper substrates, biorecognition methods, detection systems (such as optical and electrochemical detection), device patterns and dimensions, and ways in which the device is operated such as the input method of the body fluid. The device performance is quantified using indicators such as assay time, signal strength and product cost. The predictive capability of this numerical tool is verified with devices reported in the literature. It is shown that the platform can be used to identify possible improvements to these existing devices. More importantly, it can also serve as a numerical tool for synthesizing new paper-based analytical devices with minimum experimental effort.</p>","PeriodicalId":64,"journal":{"name":"Analytical Methods","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Splitting and separation mechanism of tenofovir alafenamide fumarate chiral isomers based on indirect chiral ligand exchange chromatography.","authors":"Li Lin, Longchao Xie, Lingyi Huang, Liying Huang, Youjia Wu","doi":"10.1039/d4ay01388c","DOIUrl":"https://doi.org/10.1039/d4ay01388c","url":null,"abstract":"<p><p>The isolation and analysis of chiral isomers are critical parts of the drug development process to ensure effective and safe drug administration to patients. Indirect chiral ligand exchange chromatography (ICLEC) was developed to separate and determine tenofovir alafenamide fumarate (TAF) and its diastereoisomer GS-7339, with a hypothesized separation mechanism. The effect of using a chiral column <i>versus</i> a standard C18 column on the separation of the TAF chiral isomer mixture was investigated. Various factors in ICLEC, including ligand type, ligand ratio, mobile phase composition, and column temperature, were optimized. The separation of TAF and GS-7339 was successfully achieved by selecting L-phenylalanine as the chiral selective agent and Cu(II) as the central metal ion, using a C18 column as the analytic column and a mobile phase of 20 mM ammonium dihydrogen phosphate buffer (pH = 4.0)-acetonitrile (79 : 21, v/v). The corresponding linearity range for TAF and GS-7339 indicated a good correlation with <i>R</i>² > 0.9960. The average recoveries of TAF and GS-7339 ranged from 98.2% to 106.9%. None of the eight manufacturers detected GS-7339, and the percentage of TAF-labeled amounts in the drugs ranged from 95.0% to 98.5%. TAF tablets from eight manufacturers were of satisfactory quality. The separation mechanism of TAF and GS-7339 by ICLEC is due to the different spatial configurations of the two ternary complexes formed by the two chiral isomers, leading to differences in their thermodynamic stability and retention behavior. The established ICLEC method is economical, simple, and flexible, providing an effective strategy for studying chiral drug separation and analysis.</p>","PeriodicalId":64,"journal":{"name":"Analytical Methods","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A rapid evaluation method for the quality consistency assessment and spectrum-effect relationship study of Xiaohuoluo Pills developed based on combined spectral and chromatography technology.","authors":"Fangfang Cheng, Yiting Gao, Beibei Ren, Zhongyang Zhang, Minghui Dong, Guoxiang Sun, Chaohui Song, Siqi Wang, Haixia Gao, Chunhua Zhou, Lingjiao Wang","doi":"10.1039/d4ay01029a","DOIUrl":"https://doi.org/10.1039/d4ay01029a","url":null,"abstract":"<p><p>To ensure the effectiveness of traditional Chinese medicine (TCM) and drive the advancement of high-quality Chinese medicine, the establishment of a scientifically sound quality evaluation system is particularly important. The objective of this study was to develop a straightforward and practical comprehensive evaluation method for quality control of Xiaohuoluo Pills (XHLP) by employing diverse fingerprint technologies. Firstly, Fourier transform infrared spectroscopy fingerprint (FT-IRFP), ultraviolet spectral fingerprint (UVFP) and fusion fingerprints based on five-wavelength matched average fusion fingerprint (FWFFP) were established for 21 samples. Secondly, the Comprehensive Quantified Ratio Fingerprinting Method (CQRFM) was used to conduct a comprehensive evaluation of the fingerprint profiles of 21 batches of samples and the results showed that all samples met the quality requirements. Then to further evaluate the samples, the External Standard Method (ESM) was employed to measure the content of three indicator components in XHLP, and this was done with the intention of enhancing the quality control system of the samples. Furthermore, antioxidant activity was also measured, and a model for analyzing the relationship between antioxidant data and fingerprint information from the three spectra was established using Orthogonal Projection to Latent Structures (OPLS), resulting in an accurate spectral efficacy relationship diagram. In conclusion, this study utilized spectral and chromatography techniques to comprehensively assess the quality of XHLP, incorporating qualitative and quantitative aspects. Additionally, a correlation between spectral profiles and efficacy was established by evaluating the antioxidant capacity of the samples. This method offers valuable insights for quality control not only of XHLP but also for other TCM.</p>","PeriodicalId":64,"journal":{"name":"Analytical Methods","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An all-in-one enzyme-free fluorescent aptasensor integrating localized catalyzed hairpin assembly for sensing antibiotics in food with improved detection efficiency.","authors":"Yuanyuan Peng, Min Wu, Min Liu, Yushu Wu","doi":"10.1039/d4ay01526f","DOIUrl":"https://doi.org/10.1039/d4ay01526f","url":null,"abstract":"<p><p>Enzyme-free signal amplification fluorescent aptasensors depending on multi-component freely diffusing probes have become indispensable tools for antibiotic detection in food, but they suffer from low detection efficiency and tedious operation steps. Herein, an all-in-one enzyme-free fluorescent aptasensor integrating localized catalyzed hairpin assembly (L-CHA) was designed for antibiotic detection with improved detection efficiency. In the designed aptasensor, a double-stranded DNA reactant containing an antibiotic aptamer and a primer as well as two paired hairpin DNA reactants were immobilized on one spatial-confinement DNA scaffold (that is a DNA tetrahedron). Upon addition of the target antibiotic kanamycin, the activated primer initiated L-CHA, generating an amplified fluorescence signal. Compared with previously reported enzyme-free signal amplification fluorescent aptasensors, the designed aptasensor integrated the functions of target recognition, signal transduction, and L-CHA signal amplification into a single probe. In this all-in-one design, the reactants in this aptasensor were confined to a compact space for a higher local concentration, which improved detection efficiency. In particular, this aptasensor achieved sensitive detection of kanamycin within 60 min with a low detection limit of 0.019 ng mL^-1. Additionally, the designed aptasensor depended on a single probe rather than multi-component probes, leading to simplified operation steps. Furthermore, this aptasensor was employed for detecting kanamycin in spiked milk samples with recoveries of 96.00% to 108.60%, indicating an acceptable accuracy. Therefore, this L-CHA-based all-in-one enzyme-free fluorescent aptasensor offers a prospective tool for antibiotic detection in the field of food safety.</p>","PeriodicalId":64,"journal":{"name":"Analytical Methods","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simultaneous measurements of oil- and water-content in crude oil-polluted sands with NMR-deconvolution analysis.","authors":"Yuxin Wu, Zihan Zhao, Hao Ding, Diansheng Wang, Wei Zhou","doi":"10.1039/d4ay01052c","DOIUrl":"https://doi.org/10.1039/d4ay01052c","url":null,"abstract":"<p><p>This study introduces a novel deconvolution method for accurately quantifying oil or water signals in the NMR spectra of oil-water-sand mixtures. The algorithm employs a parametric model fitting approach that incorporates prior conditions to set parameters. To validate the approach, the widely overlapping NMR spectra of the complex, synthetic oil-water-sand mixes were separated, and their water and oil contents were determined. The results demonstrated high correlation values and maximum errors of 2.11% and 3.90% for water and oil contents, respectively. The proposed deconvolution method provides an innovative solution for simultaneously measuring the content of each fluid in complex porous media containing multiple fluids by NMR spectroscopy and has the potential to facilitate research in the field.</p>","PeriodicalId":64,"journal":{"name":"Analytical Methods","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A simple turn-off fluorescent chemosensor based on a Schiff base structure for ultrafast and highly selective trace detection of Cu²⁺ ions in aqueous solutions.","authors":"Jing Wang, Lu Ren, Qiang Sun, Yanqi Liu, Wanru Jia, Huihong Zhang, Dawei Zhang","doi":"10.1039/d4ay01649a","DOIUrl":"https://doi.org/10.1039/d4ay01649a","url":null,"abstract":"<p><p>A simple turn-off fluorescent probe, 5-(diethylamino)-2-(hydrazonomethyl)phenol (DHP), is designed and synthesized for the sensitive and selective detection of Cu²⁺. The bright green fluorescence of DHP is quenched after the addition of Cu²⁺. The probe DHP exhibits good anti-interference performance against Cu²⁺ in the presence of multiple metal ions. The fluorescence intensity of DHP (10 μM) at 522 nm is well linearized with the Cu²⁺ concentration at 0-5 μM, and it has a detection limit of 0.29 nM (<i>R</i>² = 0.9949). The complexation ratio of the probe DHP to Cu²⁺ is 2 : 1 and the complexation constant is 3.44 × 10⁴ M^-1 (<i>R</i>² = 0.9974). In addition, the probe DHP can be recovered using EDTA and Cu²⁺ can be effectively monitored at pH 5-11, with good results in dipstick experiments and actual water samples. HepG-2 cells remained viable in excess of 90% after being exposed to DHP (50 μM) for 24 h, which demonstrates the extremely low toxicity of DHP, and it can be used for <i>in vivo</i> cell imaging.</p>","PeriodicalId":64,"journal":{"name":"Analytical Methods","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highly sensitive electrochemical biosensor for MUC1 detection based on DNA-functionalized CdTe quantum dots as signal enhancers.","authors":"JiaJia Wang, Chun Kan, Baokang Jin","doi":"10.1039/d4ay01544d","DOIUrl":"https://doi.org/10.1039/d4ay01544d","url":null,"abstract":"<p><p>In this paper, an electrochemical biosensor based on a cadmium telluride/polypyrrole (CdTe/PPy) nanocomposite was developed for the detection of MUC1 with high selectivity and sensitivity. Results indicate that the CdTe/PPy nanocomposite is modified on the surface of the glassy carbon electrode (GCE), which affords a large surface area for immobilizing cap-DNA, ensuring its high selectivity and sensitivity. Next, CdTe-linked sig-DNA (MUC1 aptamer) was introduced, allowing the MUC1 aptamer to hybridize with cap-DNA. CdTe is a signal amplification element used to generate a differential pulse voltammetry (DPV) signal. Conceivably, target MUC1 detection was based on current signal change due to concentration change in the signal amplification element CdTe. In the presence of MUC1, the MUC1 aptamer specifically binds to MUC1, resulting in the release of CdTe-sig-DNA from the electrode surface and a decrease in peak current. Under optimized experimental conditions, the electrochemical biosensor is highly selective, sensitive, stable, and reproducible for MUC1 ranging from 0.1 nM to 100 nM with a detection limit of 0.05 nM (S/N = 3). Therefore, the electrochemical biosensor has potential applications in medical disease diagnosis.</p>","PeriodicalId":64,"journal":{"name":"Analytical Methods","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A bimetallic PtAu-modified carbon fiber electrochemical sensor for simultaneous and highly sensitive detection of catechol and hydroquinone in environmental water.","authors":"Qi Xiao, Jiawen Li, Mingli Yang, Huihao Li, Yi Fang, Shan Huang","doi":"10.1039/d4ay01296h","DOIUrl":"https://doi.org/10.1039/d4ay01296h","url":null,"abstract":"<p><p>In this study, we report the development of a novel electrochemical sensor capable of the simultaneous detection of catechol (CC) and hydroquinone (HQ) through differential pulse voltammetry. The sensor is constructed using carbon fiber (CF) that has been intricately modified with bimetallic PtAu nanoparticles. The fabrication process involves subjecting CF to ultrasound treatment in an acidic mixture, resulting in the formation of activated carbon fiber (ACF). This activation step not only enhances surface roughness but also facilitates subsequent modification, ensuring the stability of the material. Bimetallic PtAu nanoparticles are then uniformly deposited onto the ACF surface through co-deposition from a metal precursor solution. The modified ACF, adorned with bimetallic PtAu nanoparticles, exhibits excellent conductivity and efficiently catalyzes both CC and HQ in a 10 mM phosphate-buffered saline solution at pH 7.0, thereby enabling their simultaneous detection. Under optimized experimental conditions, this electrochemical sensor achieves impressive detection limits of 0.019 μM for CC and 0.28 μM for HQ within the same concentration range of 0.5-50 μM, respectively. The practicality of the sensor is further demonstrated through recovery experiments using real water samples. This electrochemical sensor, with its superior performance and versatility, shows great potential for applications in analytical chemistry and environmental monitoring.</p>","PeriodicalId":64,"journal":{"name":"Analytical Methods","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}