Analytical Sciences最新文献_第2页

Application of digital-movie-based flow colorimetry to hue-based end point detection of acid-base titration by feedback-based flow ratiometry using universal indicator. 基于数字电影的流动比色法在通用指示剂反馈流动比色法酸碱滴定终点检测中的应用。

IF 1.8 4区化学

Analytical Sciences Pub Date : 2025-01-17 DOI: 10.1007/s44211-024-00712-6

Selass Kebede Olbemo, Yosuke Sakai, Masaki Takeuchi, Hideji Tanaka

{"title":"Application of digital-movie-based flow colorimetry to hue-based end point detection of acid-base titration by feedback-based flow ratiometry using universal indicator.","authors":"Selass Kebede Olbemo, Yosuke Sakai, Masaki Takeuchi, Hideji Tanaka","doi":"10.1007/s44211-024-00712-6","DOIUrl":"https://doi.org/10.1007/s44211-024-00712-6","url":null,"abstract":"A digital-movie-based flow colorimetry for pH measurement using a universal indicator has been applied to the end point detection of acid-base titrations. A two-channel flow system of feedback-based flow ratiometry, primarily consisting of two peristaltic pumps, a digital microscope-based detector, and a laptop computer, was constructed; a Visual Basic.NET program written in-house was used for automating the analytical processes. While maintaining the total flow rate (FT) constant, a titrand solution was merged with a titrant solution, both containing the same concentration of Van Urk's universal indicator, under varying flow ratios. Downstream, the video image was captured with a digital microscope and its color was expressed as RGB values, hue, and luminance. The end point was determined from the rapid change of hue reflecting the color transition of the universal indicator around the equivalence point. A stepwise titration of multivalent acid (i.e., H3PO4) was also possible by setting hue values corresponding to the first (1st) and second (2nd) equivalence points as criteria to determine the respective end points. The hue-based approach was validated by the titrations of CH3COOH and H3PO4 (1st and 2nd equivalence points) with 0.1 mol dm-3 NaOH and to those of NaOH and NH3 with 0.1 mol dm-3 HCl. The method was applied to determine Japanese Pharmacopoeia (JP) borax and JP citric acid. The respective assay results were 100.0 ± 0.0% and 100.0 ± 0.0%, both meeting the JP specifications. The developed method is simple, high throughput (1 titration/min), versatile, and does not require indicator replace depending on the equivalence point pH.","PeriodicalId":7802,"journal":{"name":"Analytical Sciences","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142998784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Compositional analysis of traditional liquid gold with separation of compounds containing heavy atoms in ion mobility-mass spectrometry. 离子迁移-质谱法分离含重原子化合物分析传统液态金的成分。

IF 1.8 4区化学

Analytical Sciences Pub Date : 2025-01-08 DOI: 10.1007/s44211-024-00708-2

Yoshihide Maeno, Takei Onoue, Yoshinori Iiguni, Hajime Ohtani, Shinya Kitagawa

{"title":"Compositional analysis of traditional liquid gold with separation of compounds containing heavy atoms in ion mobility-mass spectrometry.","authors":"Yoshihide Maeno, Takei Onoue, Yoshinori Iiguni, Hajime Ohtani, Shinya Kitagawa","doi":"10.1007/s44211-024-00708-2","DOIUrl":"https://doi.org/10.1007/s44211-024-00708-2","url":null,"abstract":"\"Liquid gold\" has been traditionally used for over a century to decorate ceramicware, but its chemical composition has not been thoroughly investigated. One of the keys to successfully characterizing liquid gold, which is a complex mixture, is to distinguish Au-containing products from other chemicals. In this paper, we propose a separation based on the difference in collision cross section, of which chemicals with heavy atoms are relatively smaller than those without in ion mobility-mass spectrometry (IM-MS). Chemicals containing a single Au atom (and Pt atom) were successfully separated from other species in the two-dimensional distribution map for IM-MS. By a detailed analysis of the spectra obtained by IM-MS/MS with collision-induced dissociation before and after IM separation, we found that liquid gold (gold resinate) was a mixture of a series of (1) Au reacted with α-pinene-related units and (2) Au reacted with abietic acid units. α-Pinene and abietic acid are the main components of turpentine and rosin, the raw materials of liquid gold as reported previously (Anal. Sci. 2024, 40, 133-139). All Au-containing species contain sulfur atoms. Species of Au reacted with α-pinene-related units with different degrees of unsaturation and oxidation have also been identified. Liquid gold, a complex mixture of chemicals containing Au, has been successfully analyzed compositionally.","PeriodicalId":7802,"journal":{"name":"Analytical Sciences","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142942800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Recent applications of dendritic polymers in analytical sciences 树突聚合物在分析科学中的最新应用

IF 1.8 4区化学

Analytical Sciences Pub Date : 2025-01-06 DOI: 10.1007/s44211-024-00689-2

Hirohisa Nagatani

引用次数: 0

High-affinity ssDNA aptamer and chemiluminescent aptasensor for TIMP-1 detection in human serum 用于人血清中TIMP-1检测的高亲和力ssDNA适配体和化学发光适配体传感器。

IF 1.8 4区化学

Analytical Sciences Pub Date : 2025-01-01 DOI: 10.1007/s44211-024-00673-w

Qin Wang, Yanli Li, Lige Yao, Huiqin Li, Liuyan Zhang, Yingjie Wang, Jiayin Li, Tian Chen, Kun Chai, Junli Gao, Junshun Gao, Li Su, Xueming Li

{"title":"High-affinity ssDNA aptamer and chemiluminescent aptasensor for TIMP-1 detection in human serum","authors":"Qin Wang, Yanli Li, Lige Yao, Huiqin Li, Liuyan Zhang, Yingjie Wang, Jiayin Li, Tian Chen, Kun Chai, Junli Gao, Junshun Gao, Li Su, Xueming Li","doi":"10.1007/s44211-024-00673-w","DOIUrl":"10.1007/s44211-024-00673-w","url":null,"abstract":"<div>TIMP-1 (Tissue Inhibitor of Metalloproteinases-1) is a protein involved in regulating extracellular matrix (ECM) degradation. It is recognized as a significant biomarker for cancer diagnosis. This study aimed to develop and characterize a single-stranded DNA (ssDNA) aptamer targeting human TIMP-1 protein with high affinity and specificity. A magnetic beads-based SELEX process combined with qPCR was used to select aptamers over seven rounds. The enriched ssDNA library was analyzed using high-throughput sequencing to identify candidate sequences, and these sequences were characterized using surface plasmon resonance (SPR) and binding assays to evaluate their affinity and specificity. The selected ssDNA aptamer demonstrated a dissociation equilibrium constant (KD) of 0.41 nM and a very slow off-rate, enabling effective capture of TIMP-1 in serum samples. Furthermore, a chemiluminescent aptasensor was developed for TIMP-1 detection, which exhibited high specificity and a broad linear detection range from 1 to 500 ng/mL in human serum. The developed ssDNA aptamer targeting TIMP-1 shows high affinity and specificity, and the chemiluminescent aptasensor demonstrates promising potential for clinical diagnosis of TIMP-1 levels in human serum.<h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7802,"journal":{"name":"Analytical Sciences","volume":"41 2","pages":"119 - 126"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s44211-024-00673-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142913746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Squaraine dye as a fluorescent probe for highly sensitive detection of pyrophosphate and alkaline phosphatase. Squaraine染料作为荧光探针用于焦磷酸盐和碱性磷酸酶的高灵敏度检测。

IF 1.8 4区化学

Analytical Sciences Pub Date : 2024-12-26 DOI: 10.1007/s44211-024-00697-2

Wenxuan Zhu, Shuhua Zhao, Bei Yu, Yucun Tao, Chaoyang Wang, Lei Shi, Xiufeng Zhang, Jing Meng, Chengqiu Wu, Chunguang Ding, Lijia Yu

引用次数: 0

An optical BOD biosensor based on intracellular ATP measurements in genetically modified Saccharomyces cerevisiae. 基于转基因酿酒酵母胞内ATP测量的光学生化需氧量生物传感器。

IF 1.8 4区化学

Analytical Sciences Pub Date : 2024-12-23 DOI: 10.1007/s44211-024-00706-4

Yuto Kanno, Yuta Tateno, Takuo Akimoto

{"title":"An optical BOD biosensor based on intracellular ATP measurements in genetically modified Saccharomyces cerevisiae.","authors":"Yuto Kanno, Yuta Tateno, Takuo Akimoto","doi":"10.1007/s44211-024-00706-4","DOIUrl":"https://doi.org/10.1007/s44211-024-00706-4","url":null,"abstract":"A biosensor for biochemical oxygen demand (BOD) was developed based on intracellular 5'-adenosine triphosphate (ATP) measurements in Saccharomyces cerevisiae. Intracellular ATP was measured using an engineered protein named ATeam, comprising a bacterial F0F1-ATP synthase ε subunit sandwiched between cyan fluorescent protein and mVenus, a modified yellow fluorescent protein. Because the binding of ATP to ATeam induces changes in the fluorescence spectra owing to Fӧrster resonance energy transfer, S. cerevisiae expressing ATeam is expected to show spectral changes owing to the intracellular ATP produced by the metabolism of the BOD sample. A glycogen phosphorylase knockout S. cerevisiae strain expressing ATeam was prepared, and the fluorescence spectra of the strain were analyzed. Changes in the fluorescence spectra of glucose in the medium were observed, which exhibited a linear relationship with the glucose concentration (0-100 mg/L, R2 = 0.970). Responses to lactose, fructose, sucrose, Glu, Asp, His, and Gly were evaluated and compared with typical BOD measurements. The results of this comparison suggest that a BOD biosensor based on intracellular ATP can be used for BOD measurements. A BOD standard solution comprising glucose and glutamic acid (GGA) was calibrated across a concentration range of 0 to 100 mg/L. Finally, simulated real samples were prepared using real pond water and GGA was measured. The correlation between the BOD value evaluated using intracellular ATP and that evaluated using the 5-day BOD test showed a linear relationship with R2 = 0.944.","PeriodicalId":7802,"journal":{"name":"Analytical Sciences","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Sensitivity-enhanced potentiometric measurement by incorporating graphitic carbon nitride into the ion-to-electron transducer of potassium ion-selective electrodes. 通过将石墨氮化碳纳入钾离子选择电极的离子-电子换能器的灵敏度增强电位测量。

IF 1.8 4区化学

Analytical Sciences Pub Date : 2024-12-20 DOI: 10.1007/s44211-024-00705-5

Mingpeng Yang, Jinghan Cheng, Xingqiang Zhao, Jun Cai, Wangping Zhou

{"title":"Sensitivity-enhanced potentiometric measurement by incorporating graphitic carbon nitride into the ion-to-electron transducer of potassium ion-selective electrodes.","authors":"Mingpeng Yang, Jinghan Cheng, Xingqiang Zhao, Jun Cai, Wangping Zhou","doi":"10.1007/s44211-024-00705-5","DOIUrl":"https://doi.org/10.1007/s44211-024-00705-5","url":null,"abstract":"In recent years, wearable sweat sensors have garnered significant attention for real-time monitoring of human physiological information because of their ability to continuously and non-invasively detect multiple sweat biomarkers. Among these, potentiometric sensors stand out for their low power consumption, low cost, compact design, and real-time monitoring capabilities, making them an ideal alternative for sweat analysis. However, enhancing the sensitivity of ion-selective electrodes (ISEs), a critical parameter of potentiometric sensors, remains a challenging research focus. In this work, the sensitivity of K+ ISEs was significantly enhanced by doping two-dimensional nanoparticles graphitic carbon nitride (g-C₃N₄) into the ion-to-electron transducer of the electrode via electrodeposition. The calibration curve slope of the K+ potentiometric sensors with doped g-C3N4 reached 59.6 mV/dec, representing a 33% increase in sensitivity compared to the control sensor without g-C₃N₄. Furthermore, the developed sensors demonstrated excellent repeatability, and anti-interference capabilities. Finally, the feasibility of the prepared sensors was further validated in artificial sweat. The large specific surface area of g-C₃N₄ combined with the excellent conductivity of PEDOT: PSS, significantly improved the sensitivity of ISEs in this study. This innovative approach paves a new avenue for the application of two-dimensional materials in potentiometric sensors, potentially advancing the field of real-time sweat analysis.","PeriodicalId":7802,"journal":{"name":"Analytical Sciences","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142863106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Efficient single-channel current measurements of the human BK channel using a liposome-immobilized gold probe. 利用脂质体固定金探针对人体BK通道进行有效的单通道电流测量。

IF 1.8 4区化学

Analytical Sciences Pub Date : 2024-12-20 DOI: 10.1007/s44211-024-00707-3

Minako Hirano, Mami Asakura, Toru Ide

{"title":"Efficient single-channel current measurements of the human BK channel using a liposome-immobilized gold probe.","authors":"Minako Hirano, Mami Asakura, Toru Ide","doi":"10.1007/s44211-024-00707-3","DOIUrl":"https://doi.org/10.1007/s44211-024-00707-3","url":null,"abstract":"The human BK channel (hBK) is an essential membrane protein that regulates various biological functions, and its dysfunction leads to serious diseases. Understanding the biophysical properties of hBK channels is crucial for drug development. Artificial lipid bilayer recording is used to measure biophysical properties at the single-channel level. However, this technique is time-consuming and complicated; thus, its measurement efficiency is very low. Previously, we developed a novel technique to improve the measurement efficiency by rapidly forming lipid bilayer membranes and incorporating ion channels into the membrane using a hydrophilically modified gold probe. To further improve our technique for application to the hBK channel, we combined it using the gold probe with a liposome fusion method. Using a probe on which liposomes containing hBK channels were immobilized, the channels were efficiently incorporated into the lipid bilayer membrane, and the measured channel currents showed the current characteristics of the hBK channel. This technique will be useful for the efficient measurements of the channel properties of hBK and other biologically important channels.","PeriodicalId":7802,"journal":{"name":"Analytical Sciences","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142871145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Metabolic labeling of RNA using ribonucleoside analogs enables the evaluation of RNA synthesis and degradation rates. 利用核糖核苷类似物对RNA进行代谢标记，可以评估RNA的合成和降解率。

IF 1.8 4区化学

Analytical Sciences Pub Date : 2024-12-19 DOI: 10.1007/s44211-024-00704-6

Hidenori Tani

引用次数: 0

Bromine isotope splitting in vibrational spectra of bromoform by time-resolved transient transmission spectroscopy. 时间分辨瞬态透射光谱法研究溴仿振动光谱中溴同位素的分裂。

IF 1.8 4区化学

Analytical Sciences Pub Date : 2024-12-16 DOI: 10.1007/s44211-024-00702-8

W Gadomski, K Polok, K Skała, B Ratajska-Gadomska

{"title":"Bromine isotope splitting in vibrational spectra of bromoform by time-resolved transient transmission spectroscopy.","authors":"W Gadomski, K Polok, K Skała, B Ratajska-Gadomska","doi":"10.1007/s44211-024-00702-8","DOIUrl":"https://doi.org/10.1007/s44211-024-00702-8","url":null,"abstract":"The femtosecond pump-probe technique, i.e. the transient transmission spectroscopy, has been used for the first time, to detect the vibrational spectra of symmetric fundamentals ν2 and ν3 in bromoform and chloroform. The spectra were obtained by fast Fourier transforms of the time domain signals. For both, CHCl3 and CHBr3, there are four isotopologues contributing to the spectra, due to the existence of two stable isotopes; chlorine, 35Cl and 37Cl, and bromine, 79Br and 81Br, respectively. While for chloroform the isotope splitting of the ν3 spectral band can be observed even in the spontaneous Raman scattering, for bromoform it is not detectable. Herewith we show that using the time domain spectroscopy and the windowed Fourier transform method we can provide the high resolution spectrum of the ν3 fundamental in bromoform, in which the contributions of all isotopologues are well distinguishable. The data have been collected for few volume concentrations of the studied liquids diluted in the neutral solvent CCl4. It is shown that the intensity pattern of the spectra evolves with decreasing concentration and for the ν3 fundamental it reaches the natural abundance pattern at a very high dilution. The simple theoretical model, which treats the molecules in a liquid as interacting oscillators, allows us to explain the dependence of the shape of the spectrum on the strength of the intermolecular interactions.","PeriodicalId":7802,"journal":{"name":"Analytical Sciences","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142827123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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