5,458 results match your criteria Analytical Sciences[Journal]

Lanthanide extraction using a thiodiglycolamic acid extractant: effect of S-donor on lanthanide separation.

Anal Sci 2022 May 22. Epub 2022 May 22.

Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA), 1-1-1 Koto, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan.

Liquid-liquid extraction of lanthanide (Ln) ions was investigated using N,N-dioctylthiodiglycolamic acid (DOTDGAA), which is a sulfur donor ligand with an amide group and a carboxyl group connected by a thioether chain. The extraction performance and selectivity of DOTDGAA for Ln ions were compared with those of N,N-dioctyldiglycolamic acid (DODGAA), which is also an oxygen donor ligand with a similar chemical structure, to assess the effect of the soft/hard donor atom on Ln separation. DOTDGAA quantitatively extracted all Ln ions while being selective toward the light and middle Ln ions, in contrast to the selectivity of DODGAA for heavier Ln ions. Read More

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A rapid room-temperature cloud point extraction for spectrophotometric determination of Copper (II) with 6,7-dihydroxy-2,4-diphenylbenzopyrylium chloride.

Anal Sci 2022 May 19. Epub 2022 May 19.

Department of Analytical and Toxicological Chemistry, Odessa I.I. Mechnikov National University, Odesa, 65082, Ukraine.

The conditions for the surfactant rich phase of Triton X-100 formation and the extraction of Copper (II) as a complex with 6,7-dihydroxy-2,4-diphenylbenzopyrylium chloride at room temperature have been optimized. It was shown that the sodium salt of p-toluic acid can be used as a chemical initiator of cloud point extraction. The optimal conditions for room temperature cloud point extraction were found to be: pH 5. Read More

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Micro-Raman spectroscopic analysis on natural carbonates: linear relations found via biaxial plotting of peak frequencies for cation substituted species.

Anal Sci 2022 May 18. Epub 2022 May 18.

Department of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan.

Carbonates are ubiquitous minerals carrying important information on aqueous environments where they precipitated on the Earth and space. While their ideal chemical formulae are denoted as simple as MCO or MM(CO) (M: metal cations), natural carbonates generally form solid-solution series and their compositions deviate from the ideal formulae. Since their cation composition due to the substitution provides a sensitive indicator for chemical and thermodynamic environments of aqueous solutions where they precipitated, their composition analysis has been widely carried out from the environmental/geochemical/astrochemical aspects. Read More

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Development of a highly sensitive Prussian-blue-based enzymatic biosensor for L-carnitine employing the thiol/disulfide exchange reaction.

Anal Sci 2022 May 16. Epub 2022 May 16.

Research and Development Center for Minimally Invasive Therapies, Institute of Medical Science, Tokyo Medical University, 6-1-1, Shinjuku, Tokyo, 160-0023, Japan.

This is the first report of conducting proof-of-concept study for amperometric acetyltransferase-based L-carnitine sensor by employing the thiol/disulfide exchange reaction. The carnitine acetyltransferase (CrAT) catalyzes the reaction between acetyl-CoA and L-carnitine to produce CoA which is difficult to detect directly by electrochemical methods owing to steric hindrance and electrostatic effect of CoA. The thiol/disulfide exchange reaction between CoA and cystamine was mediated in the enzymatic reaction to produce electrochemically detectable low molecular weight of cationic cysteamine. Read More

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Kinetics and mechanism of Eu(III) transfer in tributyl phosphate microdroplet/HNO aqueous solution system revealed by fluorescence microspectroscopy.

Anal Sci 2022 May 13. Epub 2022 May 13.

Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan.

In this study, we reveal an Eu(III) extraction mechanism at the interface between HNO and tributyl phosphate (TBP) solutions using fluorescence microspectroscopy. The mass transfer rate constant at the interface is obtained from the analysis of fluorescence intensity changes during the forward and backward extractions at various HNO and TBP concentrations to investigate the reaction mechanism. This result indicates that one nitrate ion reacts with Eu(III) at the interface, whereas TBP molecules are not involved in the interfacial reaction, which is different from the results obtained using the NaNO solution in our previous study. Read More

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Gas chromatographic determination of volatile compounds.

Ikuo Ueta

Anal Sci 2022 05;38(5):737-738

Department of Applied Chemistry, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, Japan.

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316 stainless steel wire mesh for visual detection of HO, glutathione and glucose based on the peroxidase-like activity.

Anal Sci 2022 Apr 28. Epub 2022 Apr 28.

CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao, 266071, China.

Stainless steel is a frequently used and cost-effective material. In this study, we discovered for the first time that fresh 316ss possessed an intrinsic peroxidase (POD) catalytic activity, which can catalyze the substrate of POD-like reaction 3,3',5,5'-tetramethylbenzidine (TMB) changing to a blue-colored product, oxidation of TMB, in the presence of hydrogen peroxide (HO). Subsequently, a rapid method was conducted to enable the active composites of the 316ss with reused POD activity for 25 circles at least. Read More

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Correction to: Antibody-labeled gold nanoparticles based immunosensor for the detection of thyroxine hormone.

Anal Sci 2022 Apr 21. Epub 2022 Apr 21.

CSIR-Central Scientific Instruments Organization (CSIR-CSIO), Chandigarh, 160030, India.

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Investigation of H nuclear magnetic resonance relaxometry to screen metabolic syndrome and diabetes.

Anal Sci 2022 Apr 19. Epub 2022 Apr 19.

Jiangsu Key Laboratory for Design and Manufacture of Micro‑Nano Biomedical Instruments, Southeast University, Nanjing, 211189, China.

The purpose of this study was to investigate and compare the abilities of H nuclear magnetic resonance (NMR) transverse relaxation constant time (T) and longitudinal relaxation constant time (T) to screen people at the risk of diabetes and metabolic syndrome. Human blood samples were collected for NMR detection and biochemical examinations. Bivariate correlations, categorical analyses were performed to explore the relationship between NMR relaxation time and metabolic biomarkers. Read More

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Inhibition of direct-electron-transfer-type bioelectrocatalysis of bilirubin oxidase by silver ions.

Anal Sci 2022 Apr 18. Epub 2022 Apr 18.

Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo, Kyoto, 606-8502, Japan.

In enzyme-based biosensors, Ag eluted from the reference electrode inhibits the enzyme activity. Herein, to suppress the inhibition of bilirubin oxidase (BOD) by Ag, kinetic analysis was used to examine the effect of Ag on the activity of BOD. It was confirmed that the addition of Ag decreased the bioelectrocatalytic activity of BOD. Read More

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Fast detection of isocarbophos using bis-propargylcalix[4]arene-stabilized silver nanoparticles.

Anal Sci 2022 Apr 18. Epub 2022 Apr 18.

Key Laboratory of Pesticide and Chemical Biology (CCNU), Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, 430079, Hubei Province, People's Republic of China.

Bis-propargylcalix[4]arene-stabilized silver nanoparticles (BPCA-Ag NPs), as a chemosensor for detecting an isocarbophos (ICP) pesticide in an aqueous medium, are reported in this work. The nanoparticles were characterized by UV-visible spectroscopy, dynamic light scattering, zeta potential and high-resolution transmission electron microscopy techniques. It was observed that the BPCA-Ag NPs had a high selectivity for isocarbophos with a detection limit of 1. Read More

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Investigation of optimal conditions needed for the production of indigo and subsequent dyeing using CO/O sensors and a cellphone camera.

Anal Sci 2022 Apr 11;38(4):711-716. Epub 2022 Apr 11.

Department of Fine Arts, Research Center for Conservation of Cultural Relics, National Taiwan University, No. 1, Shida Rd., Da'an District, Taipei, 10645, Taiwan.

An investigation of the process involved in the production of and dyeing with indigo based on a CO/O sensor device and a cellphone-camera is reported. The former involves transforming indican to indigo, and the latter the process by which indigo and indigo-white are produced. During the process of indigo production, a clear and positive correlation can be observed between the concentration of gas levels (either the production of CO or the consumption of O) and the final yield. Read More

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Improvement of analysis throughput for LC/MS assay.

Shoujiro Ogawa

Anal Sci 2022 04;38(4):633-634

Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, 1 Sanzo, Gakuen-cho, Fukuyama, Hiroshima, 729-0292, Japan.

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Utilizing dual carriers assisted by enzyme digestion chemiluminescence signal enhancement strategy simultaneously detect tumor markers CEA and AFP.

Anal Sci 2022 Apr 11. Epub 2022 Apr 11.

School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, 330031, People's Republic of China.

To measure two tumor biomarkers, alpha-fetoprotein (AFP) and carcinoembryonic antigen (CEA), a dual-carrier CL sensor with restriction enzyme digestion (Exo I) and aptamer technology utilizing gold nanoparticles (hydroxylamine amplification) and horseradish peroxidase (HRP) as the CL signal enhancement in the sensing strategy was formed. These nanoparticles and nano-enzyme were precisely detected and tagged to the appropriate position attributable to the particular recognition of biotin and streptavidin. In this sensing strategy, target markers were further enriched and recognized sensitively by CL following enrichment, and matching strong chemical signals were collected under luminol catalysis, allowing for marker identification. Read More

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Speciation of tin ions in oxide glass containing iron oxide through solvent extraction and inductively coupled plasma atomic emission spectrometry after the decomposition utilizing ascorbic acid.

Anal Sci 2022 Apr 7. Epub 2022 Apr 7.

Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan.

Determining the concentrations of different Sn ions in glass containing iron oxide by wet chemical analysis is a challenge because a redox reaction occurs between Sn and Fe. A chemical analysis method for determining the concentrations of Sn and Sn in soda lime glass containing iron oxide was proposed. A mixture of ascorbic acid, hydrochloric acid, and hydrofluoric acid was used to decompose the sample in a vessel with nitrogen flow. Read More

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The analysis of nickel-obsidian composite formation on mild steel surface through electrocodeposition process.

Anal Sci 2022 May 7;38(5):769-776. Epub 2022 Apr 7.

Faculty of Mechanical and Aerospace Engineering, Bandung Institute of Technology, Jl. Ganesha 10, Bandung, 40132, Indonesia.

Composite, the engineering material consisting of two different macroscopic phases, can be synthesized through electro co-deposition reaction by adding particles into the solution of the electroplating process. The obsidian powder as dispersed particles and the nickel-metal as the matrix are the materials that can be synthesized using that technique. The hardness of obsidian is in the range of 650-900 HV, whereas nickel is 380 HV. Read More

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An amperometric glucose biosensor based on electrostatic force induced layer-by-layer GOD/chitosan/pyrite on a glassy carbon electrode.

Anal Sci 2022 Mar 1;38(3):553-562. Epub 2022 Apr 1.

School of Chemical Engineering, University of Science and Technology Liaoning, 185 Qianshan Middle Road, High-Tech Zone, Anshan, 114051, Liaoning, China.

Pyrite (PR), as a representative sulfide mineral, possesses the advantages of abundancy, thermodynamic stability, non-toxicity and semi-conductivity. In this study, an amperometric glucose biosensor (GOD/CS/PR/GCE) based on layer-by-layer of glucose oxidase (GOD), chitosan (CS) and pyrite (PR) on a glassy carbon electrode (GCE) was fabricated through electrostatic force. In this research, PR suspension prepared in phosphate buffer (pH 5. Read More

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Rapid determination of cysteine and chiral discrimination of D-/L-cysteine via the aggregation-induced emission enhancement of gold nanoclusters by Ag.

Anal Sci 2022 Mar 1;38(3):541-551. Epub 2022 Apr 1.

Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China.

Cysteine (Cys) plays vital roles in various physiological and pathological functions. Either a deficiency or excess of Cys could lead to severe ailments in human. The identification and determination of Cys are the key issues for the early diagnosis of relevant diseases. Read More

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Simplified fabrication of laminated paper-based analytical device (LPAD) with color-palette mobile app for analysis of salicylic acid in pharmaceutical products.

Anal Sci 2022 Mar 1;38(3):533-540. Epub 2022 Apr 1.

Flow-Innovation Research for Science and Technology Laboratories (Firstlabs), Rama VI Rd, Bangkok, 10400, Thailand.

In this work, we present for the first time, a simplified fabrication of a laminated paper-based analytical device (LPAD) with a free-mobile app, Palette Cam, for image analysis. A filter paper is cut in a rectangular shape (9 × 3 cm) and placed between a top laminating sheet with punched holes and a bottom laminating sheet. The holes allow accessibility of liquid on the paper. Read More

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Visual detection of perchlorate in aqueous solution using alkali methylene blue.

Anal Sci 2022 Mar 1;38(3):525-531. Epub 2022 Apr 1.

Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, 310008, People's Republic of China.

Perchlorate (ClO) has aroused wide concern as a global ecosystem pollutant, especially in the aquatic environment. A rapid and visible detection of ClO in aqueous solution using alkali methylene blue (MB) and liquid-liquid extraction (LLE) was established with high selectivity and sensitivity. The alkali MB exclusively change from red into blue in an organic solvent when exposed to aqueous ClO. Read More

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Effect of charcoal grilling on polycyclic aromatic hydrocarbons (PAHs): content, composition, and health risk in edible fish in Japan.

Anal Sci 2022 Mar 1;38(3):515-523. Epub 2022 Apr 1.

Faculty of Health Sciences, Hokkaido University, Kita-12, Nishi-5, Kita-Ku, Sapporo, 060-0812, Japan.

The content and composition of polycyclic aromatic hydrocarbons (PAHs) induced by charcoal grilling of fish were determined in this study. Using HPLC-DAD, the simultaneously quantitative method for 16 priority PAHs was developed and applied to three common Japanese fish: mackerel, pacific saury, and sardine. Charcoal grilling largely increased the content of both total and representative PAHs. Read More

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A red-emission fluorescence probe based on 1,4-addition reaction mechanism for the detection of biothiols in vitro and in vivo.

Anal Sci 2022 Mar 1;38(3):505-514. Epub 2022 Apr 1.

School of Chemical Engineering, University of Science and Technology Liaoning, Anshan, 114051, Liaoning, People's Republic of China.

In this work, a new fluorescence probe (DC) with a donor-π-acceptor (D-π-A) structure was designed and synthesized for the detection of three kinds of biothiols (Cys, Hcy and GSH) in live cells and organisms. DC displayed an intense red-emission centered at 625 nm. In the presence of biothiols, the nucleophilic addition reaction between the C=C double bond of DC and the sulfhydryl group (-SH) of biothiols occurred, resulting in obvious fluorescence quenching responses. Read More

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A Prussian blue nanoparticles-based fluorescent nanoprobe for monitoring microRNA-92a and microRNA-21.

Anal Sci 2022 Mar 1;38(3):497-504. Epub 2022 Apr 1.

Academy of Military Medical Sciences, Academy of Military Sciences, Beijing, 100850, People's Republic of China.

Since microRNA-92a (miR-92a) and microRNA-21 (miR-21) are crucial biomarkers for colorectal cancer (CRC), monitoring miR-92a and miR-21 in serum is very significant for the early diagnosis of CRC. In this work, we developed a simple and sensitive fluorescent biosensor for the detection of miR-92a and miR-21 based on the quenching ability of Prussian blue nanoparticles (PBNPs) to fluorophores. Carboxyl fluorescein (FAM)-modified ssDNA (P-92a) and Cyanine 5 (Cy5)-modified ssDNA (P-21) were completely complementary to miR-92a and miR-21 separately. Read More

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Comparison and characterization of pigments and dyes by Raman spectroscopy.

Anal Sci 2022 Mar 1;38(3):483-495. Epub 2022 Apr 1.

Department of Fine Arts, National Taiwan University, No.1, Shida Rd., Da'an Dist., Taipei, 10645, Taiwan.

This review provides a general understanding of Raman spectroscopy for use in the identification of pigments and dyes. The methodologies associated with a number of different related applications are also summarized. The first part of this review clarifies our basic knowledge regarding natural minerals and pigments. Read More

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Research progress on photoelectrochemical sensors for contamination analysis in agricultural fields.

Anal Sci 2022 Mar 1;38(3):459-481. Epub 2022 Apr 1.

Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, School of Agricultural Engineering, Jiangsu University, Zhenjiang, 212013, Jiangsu, China.

The establishment of rapid and efficient contamination detection methods in agricultural fields is of great significance for safeguarding agricultural production and human health, and for ensuring the healthy development of agricultural industries. As a booming analytical method, photoelectrochemical (PEC) sensors, which combine the advantages of electrochemical analysis and optical analysis, have received increasing research attention. Due to the complete separation of the excitation source (light) and the detection signal (current), the background signal of PEC sensors is greatly decreased, and their sensitivity is high. Read More

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Detection of hydrogen peroxide.

Kohei Uematsu

Anal Sci 2022 03;38(3):457-458

Department of Bioscience and Biotechnology, Fukui Prefectural University, Eiheiji, Fukui, 910-1195, Japan.

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Polystyrene-coated magnetic nanoparticles based dispersive solid phase extraction for the determination of cadmium in cigarette ash prior to slotted quartz tube flame atomic absorption spectrometry system.

Anal Sci 2022 Mar 27. Epub 2022 Mar 27.

Department of Chemistry, Yıldız Technical University, Faculty of Art and Science, 34220, İstanbul, Turkey.

A sensitive, accurate and simple analytical method was developed to determine cadmium by slotted quartz tube-flame atomic absorption spectrometry after preconcentration/extraction with polystyrene coated magnetic nanoparticles based dispersive solid phase extraction. The surface of FeO based magnetic nanoparticles was modified with polystyrene to yield higher selectivity and sensitivity in adsorption efficiency of cadmium. The nanoparticles were dispersed into the aqueous solution to extract/separate cadmium. Read More

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Application of near-infrared spectroscopy to agriculture and forestry.

Anal Sci 2022 Apr 26;38(4):635-642. Epub 2022 Mar 26.

Graduate School of Bioagricultural Sciences, Nagoya University, Furo-Cho, Chikusa, Nagoya, 464-8601, Japan.

Depending on the uniformity of the quality attribute within agricultural products, there is often a need to develop non-destructive and efficient evaluation methods to assure their qualities. Near-infrared spectroscopy (NIRS) is a well-suited method to characterize organic compounds, particularly when coupled with multivariate analysis methods. This review article introduces scientific and technical reports using the NIRS to evaluate food, agriculture, and forest products. Read More

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Direct digestion of human scalp hair on the substrate used for total reflection X-ray fluorescence analysis.

Anal Sci 2022 May 28;38(5):821-824. Epub 2022 Mar 28.

Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi, Osaka, 558-8585, Japan.

It is important to determine the elemental content of scalp hair to evaluate human health and environmental contamination. Here, a new sample preparation method for total reflection X-ray fluorescence analysis was developed by directly digesting the human hair on the sample holder. A human hair sample was subjected to thermal nitric acid treatment for sample digestion and homogenization. Read More

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An application study of membraneless-gas separation microfluidic paper-based analytical device for monitoring total ammonia in fish pond water using natural reagent.

Anal Sci 2022 May 28;38(5):759-767. Epub 2022 Mar 28.

Flow Innovation-Research for Science and Technology Laboratories (Firstlab), Mahidol University, Rama 6 Road, Bangkok, 10400, Thailand.

The membraneless-gas separation microfluidic paper-based analytical device (ML-GS μPAD), consisting of donor, spacer, and acceptor layers, was developed to monitor total ammonia in fish pond water. The principle of the analysis involved the addition of sodium hydroxide solution to the sample zone in the donor layer containing ammonia/ammonium, and the produced ammonia gas diffuses through the spacer to the detection zone in the acceptor layer containing red rose extract to produce a color change from pink to blue corresponding to the ammonia/ammonium concentration. Under optimum conditions, the proposed method provided good linearity of ammonia in the range concentration of 0-100 mg L (R = 0. Read More

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