Subjects -> CHEMISTRY (Total: 986 journals)
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ANALYTICAL CHEMISTRY (59 journals)

Showing 1 - 50 of 50 Journals sorted alphabetically
Accounts of Chemical Research     Hybrid Journal   (Followers: 228)
Acta Analytica     Hybrid Journal   (Followers: 9)
Advances in Analytical Chemistry     Open Access   (Followers: 42)
American Journal of Analytical Chemistry     Open Access   (Followers: 43)
Analitika i kontrol` (Analytics and control)     Open Access   (Followers: 1)
Analytica Chimica Acta     Hybrid Journal   (Followers: 49)
Analytica Chimica Acta : X     Open Access   (Followers: 1)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 33)
Analytical and Bioanalytical Chemistry Research     Open Access   (Followers: 4)
Analytical Chemistry     Hybrid Journal   (Followers: 361)
Analytical Chemistry Insights     Open Access   (Followers: 26)
Analytical Chemistry Letters     Hybrid Journal   (Followers: 2)
Analytical Letters     Hybrid Journal   (Followers: 10)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 15)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 13)
Chemical Data Collections     Hybrid Journal  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 3)
Composites Communications     Full-text available via subscription   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 7)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 29)
Current Analytical Chemistry     Hybrid Journal   (Followers: 10)
Drug Testing and Analysis     Hybrid Journal   (Followers: 11)
Electroanalysis     Hybrid Journal   (Followers: 9)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 6)
International Journal of Analytical Chemistry     Open Access   (Followers: 22)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 8)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 8)
Journal of Analysis and Testing     Hybrid Journal  
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 7)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 12)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 26)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 9)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 3)
Journal of Progressive Research in Chemistry     Open Access   (Followers: 8)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 8)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 26)
Microchemical Journal     Hybrid Journal   (Followers: 4)
Nature Catalysis     Hybrid Journal   (Followers: 6)
Nigerian Journal of Chemical Research     Full-text available via subscription   (Followers: 2)
Opflow     Full-text available via subscription   (Followers: 1)
Pharmaceutical Analytical Chemistry: Open Access     Open Access   (Followers: 2)
Phytochemical Analysis     Hybrid Journal   (Followers: 3)
Polish Journal of Chemical Technology     Open Access   (Followers: 2)
Surface and Interface Analysis     Hybrid Journal   (Followers: 16)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 5)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 51)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 3)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 13)
World Journal of Analytical Chemistry     Open Access   (Followers: 4)
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Journal of Analysis and Testing
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2096-241X - ISSN (Online) 2509-4696
Published by Springer-Verlag Homepage  [2659 journals]
  • Diagnostic Techniques for COVID-19: A Mini-review of Early Diagnostic
           Methods

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      Abstract: Abstract The outbreak of severe pneumonia at the end of 2019 was proved to be caused by the SARS-CoV-2 virus spreading out the world. And COVID-19 spread rapidly through a terrible transmission way by human-to-human, which led to many suspected cases waiting to be diagnosed and huge daily samples needed to be tested by an effective and rapid detection method. With an increasing number of COVID-19 infections, medical pressure is severe. Therefore, more efficient and accurate diagnosis methods were keen urgently established. In this review, we summarized several methods that can rapidly and sensitively identify COVID-19; some of them are widely used as the diagnostic techniques for SARS-CoV-2 in various countries, some diagnostic technologies refer to SARS (Severe Acute Respiratory Syndrome) or/and MERS (Middle East Respiratory Syndrome) detection, which may provide potential diagnosis ideas.
      PubDate: 2021-10-04
       
  • Fluorescence “turn-on” Sensing Platform for Glutathione Detection
           Using Chitosan-Based Glutaraldehyde Non-conjugated Polymers

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      Abstract: Abstract We established a fluorescence “turn-on” sensing platform for glutathione (GSH) detection utilizing chitosan-based glutaraldehyde non-conjugated polymers (GCPF) as nanomaterials via fluorescence resonance energy transfer (FRET) principle. Owing to the overlapping property of absorption spectrum of MnO2 nanosheets with fluorescence spectrum of GCPF, fluorescent intensity of GCPF was quenched in the presence of MnO2 nanosheets because of FRET principle. When GSH was added, MnO2 nanosheets were reduced and decomposed into large amounts of Mn2+ ions owing to reducing property of GSH. Accordingly, the quenched fluorescent intensity was turned on again. Therefore, this platform based on MnO2 nanosheet has been first applied to fluorescence “turn-on” detection of GSH from 0.5 to 50 μmol/L with sdetection limit of 84 nmol/L. It showed high selectivity in GSH detection towards other ions and biomolecules such as L-lysine, L-threonine, L-valine, L-glutamic acid and DL-aspartic acid. When it was utilized in detecting GSH in serum samples, satisfactory recoveries ranged from 101.5% to 103.2%, indicating the accuracy of this fluorescence “turn-on” platform in bioanalysis.
      PubDate: 2021-09-19
       
  • Mass Spectrometry-based Proteomics and Glycoproteomics in COVID-19
           Biomarkers Identification: A Mini-review

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      Abstract: Abstract The first corona-pandemic, coronavirus disease 2019 (COVID-19) caused a huge health crisis and incalculable damage worldwide. Knowledge of how to cure the disease is urgently needed. Emerging immune escaping mutants of the virus suggested that it may be potentially persistent in human society as a regular health threat as the flu virus. Therefore, it is imperative to identify appropriate biomarkers to indicate pathological and physiological states, and more importantly, clinic outcomes. Proteins are the performers of life functions, and their abundance and modification status can directly reflect the immune status. Protein glycosylation serves a great impact in modulating protein function. The use of both unmodified and glycosylated proteins as biomarkers has also been proved feasible in the studies of SARS, Zika virus, influenza, etc. In recent years, mass spectrometry-based glycoproteomics, as well as proteomics approaches, advanced significantly due to the evolution of mass spectrometry. We focus on the current development of the mass spectrometry-based strategy for COVID-19 biomarkers’ investigation. Potential application of glycoproteomics approaches and challenges in biomarkers identification are also discussed.
      PubDate: 2021-09-08
       
  • Special Topic: Resonance Spectroscopy and Spectrometry

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      PubDate: 2021-09-01
       
  • ATR–FTIR Spectroscopy Combined with the Invitro Antioxidant Activity and
           Chromaticity for Rapid Discrimination of Fig (Ficus carica L.) Cultivars

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      Abstract: Abstract Vibrational spectroscopy analysis of full-ripened fig fruits (Ficus carica L.) was acquired using Fourier-transformed infrared (FTIR) spectroscopy by attenuated total reflectance (ATR). The objective of this study was to investigate accurate discrimination of 25 fig cultivars using chemometric analysis of both ATR–FTIR fingerprinting and in-vitro antioxidant activity along with chromatic coordinates color. In-vitro antioxidant activity was assessed through three methods and displayed statistically significant differences across cultivars and between the fruit parts, with promising antioxidant potency. Infrared spectra were measured separately on both peels and pulp to better know which fruit part provides high discrimination throughput between cultivars. The results showed vibration intensities of five fingerprint regions displaying statically significant differences. The highest vibration intensity occurred in the region of 1175–940 cm−1 including the phenols fingerprint. Principal components analysis based on integrated intensities corresponding to fingerprint regions, revealed two main groups in pulp samples, while five groups in peels samples. The pulp extracts of ‘Nabout’ showed a typical vibration in 3000–2800 cm−1 and 1775–1725 cm−1 regions and, therefore was classified as single subset in cultivars scatterplot. This cultivar had a light-colored fig and exhibited the highest antioxidant potency for all essays particularly in peel extracts. The biochemical assessment and FTIR fingerprinting data were involved in PCA analysis, and that displayed some dissimilarities in the classification patterns, given the fact that antioxidant activities and chromaticity together could not totally explain the classification based on FTIR fingerprinting between peel and pulp. Application of FTIR–ATR spectroscopy to discriminate fig cultivars seems to be a rapid, accurate and cost-effective alternative to laborious measurement techniques, in fig quality screening and preselection, such as chromatography analysis. This study suggests the use of fig peels for a high-level discrimination while using ATR–FTIR spectroscopy, since it provides high-throughput screening framework.
      PubDate: 2021-09-01
       
  • Free-Standing Membrane Liquid-State Platform for SERS-Based Determination
           of Norfloxacin in Environmental Samples

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      Abstract: Abstract Surface-enhanced Raman scattering (SERS) has been widely used in various fields due to high sensitivity, but it is hindered by its low repeatability. Here, we explored a highly reproducible free-standing liquid-state platform (FSM) for monitoring norfloxacin (NOR) in the environmental field. After optimizing the types of nanoparticles (NPs) and pH value in NOR solution, the relative standard deviation (RSD) of FSM SERS analysis can be stabilized below 10% (n ≥ 8), and the R2 of the calibration curve in the range of 20 µg/L–100 µg/L was 0.995. In addition, the results showed that the limit of detection (LOD) (3σ/k) of NOR was 1.3 µg/L. Moreover, the NOR in the spiked samples was successfully quantified by FSM, and the recovery rate exceeded 95%. The proposed method has the potential for rapid analysis of drug residues in environmental samples.
      PubDate: 2021-09-01
       
  • Preparation of Silica-Based Superficially Porous Silica and its
           Application in Enantiomer Separations: a Review

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      Abstract: Abstract Chromatographic substrate material, as a carrier of chromatographic stationary phases, plays a vital role in defining its chromatographic characteristics, including column efficiency, stability, peak capacity and so on. In recent years, superficially porous silica (SPS) was widely valued for its excellent performance in improving the column efficiency due to its special structural properties, which was considered as a real substitute for fully porous SiO2 (FPS) and had been used to develop a new generation of highly efficient stationary phase. To help researchers better understand the SPS and further promote its application and development in the field of chromatography, the rapid separation mechanism, preparation method and its applications in the rapid separation and analysis of enantiomers were systematically introduced, and the development prospects of SPS were also prospected in this paper.
      PubDate: 2021-09-01
       
  • Selective Aggregation of Silver Nanoprisms Induced by Monohydrogen
           Phosphate and its Application for Colorimetric Detection of Chromium (III)
           Ions

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      Abstract: Abstract In this study, we established a simple colorimetric method for visual detection of chromium (III) ions using aggregated silver nanoprisms induced by monohydrogen phosphate. The detection strategy had two steps, selective aggregation of silver nanoprisms with monohydrogen phosphate at high temperature, and anti aggregation of silver nanoprisms in the presence of chromium (III) ions. In this strategy, significant spectral shift of the localized surface plasmon resonance (LSPR) absorption peak of silver nanoprisms could be visualized with the color changed from yellow to blue. The spectral peak shift of silver nanoprisms in the anti-aggregation process was linear with the concentrations of the added chromium (III) ions in the range of 20.0–800.0 nM. Thus, a colorimetric method for chromium (III) ions detection was established with the detection limit of 3.6 nM. The experimental results of real water samples indicated that the colorimetric sensor was potential in environmental monitoring.
      PubDate: 2021-09-01
       
  • AuNPs/graphene Hybrids-Based Enzyme-Free Plasmonic Immunoassay for
           Respiratory Syncytial Virus Detection

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      Abstract: Abstract Accurate diagnosis of early infections caused by the viral pathogen is a major challenge because patients usually have nonspecific signs. The development of sensitive, reliable, robust, and rapid laboratory tools is still in high demand. Herein, we developed an extremely sensitive and affordable plasmonic immunoassay for respiratory syncytial virus (RSV) detection with the naked eye based on gold nanoparticles (AuNPs)/graphene hybrids combined with metal enhancement solution. The limit of detection was found to be 1.7 fg/mL, which was 100 times higher than that of the AuNPs-based method. The ultrahigh sensitivity could be attributed to the large number of well-dispersed AuNPs deposited on the graphene surface, which had an extremely high relative surface area. Further signal amplification was achieved by catalytic enlargement of AuNPs with HAuCl4-NH2OH redox reaction. Moreover, the plasmonic immunoassay was successfully used to detect RSV in artificial serum samples, showing great potential in practical applications.
      PubDate: 2021-09-01
       
  • Trends in Gunshot Residue Detection by Electrochemical Methods for
           Forensic Purpose

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      Abstract: Abstract Gunshot Residue (GSR) has been a subject of interest for the forensic fraternity. Numerous analytical contributions towards the GSR analysis have been reported. Sensitivity, portability, cost-effectiveness, speed, etc. are such factors of electrochemical methods that have attracted the researchers across the globe to test the applicability of these as a potential analytical tool for forensic evaluation of GSR. With the development of scientific technology, efforts have been made towards the hand-held device for the on-field analysis of GSR. Recently, chemometric treatment of data generated from the electrochemical analysis of GSR has offered more effective approach. It makes the analysis more conclusive and minimizes the chances of false-positive detection. It will be very fruitful to anticipate the analytical potential of electrochemical tools for GSR analysis. This article reviews the research progress towards the development of electrochemical sensor for GSR detection reported during 2013–2020 along with challenges and future perspectives.
      PubDate: 2021-09-01
       
  • A Rapid Visual Detection of Ascorbic Acid Through Morphology
           Transformation of Silver Triangular Nanoplates

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      Abstract: Abstract A rapid and sensitive colorimetric detection of ascorbic acid (AA) through the morphology transformation of silver triangular nanoplates (Ag TNPs) is developed. By virtue of the redox reaction among silver nitrate and AA, the newly formed Ag atoms deposited on the surfaces of Ag TNPs. Subsequently, the morphology of Ag TNPs transforms from triangle to circle, resulting in a more than 160 nm blue shift of localized surface plasmon resonance absorption peak. The corresponding color of the solution converting from blue to yellow with the concentration of AA can be observed by naked eyes within 15 min. A linear relationship between the blue shift of absorption peak and the concentration of AA ranging from 0.2 to 6 μM is obtained with a limit of detection (LOD) of 100 nM (3σ). Some potential species (e.g., glucose, urea and various amino acids) coexisting in the system showed little or no interference. The proposed assay is successfully employed to determine the amount of AA in pharmaceutical products with recoveries from 96.9 to 106.5% and offers a sensitive, low-cost, rapid and simple assay of visual analysis of ascorbic acid.
      PubDate: 2021-09-01
       
  • Selective and Sensitive Discrimination of Zinc and Cadmium Based on a
           Novel Fluorescent Porous Organic Polymer

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      Abstract: Abstract Zinc and cadmium are two main transition metal ions and play profound important roles in environmental and human health. But the distinctive detection of these two ions is still challenging since they belong to the same periodic group and have similar chemical properties. A fluorescent bipyridine-based porous organic polymer (Bpy-POP) containing aggregation caused quenching (ACQ) units (anthracene) and metal ions recognition units (bipyridine) was synthesized through the Schiff base condensation reaction. In the DMF/H2O mixtures with the water fractions of 90%, the Bpy-POP aggregated and the fluorescent Bpy-POP quenched subsequently due to the ACQ effect of anthracene in the skeleton (“OFF” state). With the addition of Zn2+ or Cd2+, however, the strong coordination of the bipyridine units from the adjacent Bpy-POPs with Zn2+ or Cd2+ induced the partial dispersion of large Bpy-POP aggregates. Consequently, the fluorescence intensities enhanced dramatically as well as the fluorescence emission shifted to redder region, showing an “ON” state. Combing the fluorescence increasing efficiency and the maximum emission wavelength shift degree together, Zn2+ and Cd2+ can be selectively discriminated and quantitatively detected, which exhibits a great promising of the present Bpy-POP based method in Zn2+ and Cd2+ monitoring in real samples.
      PubDate: 2021-09-01
       
  • Study on the Photolysis Route of Nano
           2,2ʹ,4,4ʹ,6,6ʹ–Hexanitrostillbene by Vibrational Spectroscopy

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      Abstract: Abstract The understanding of the photolysis process of 2,2ʹ,4,4ʹ,6,6ʹ–hexanitrostillbene (HNS, an insensitive high-energy explosive) is very important not only for enhancing the detonation performance but also for its lifetime prediction. In this work, UV–Vis light-induced photolysis of nano HNS was studied by different spectroscopic methods. Nano HNS was found to be sensitive to UV–Vis lights at 365 and 470 nm. The photolysis route of nano HNS was mostly the same as its bulk counterpart, which was likely to be the combination of the isomerization of –NO2 to –ONO and the breaking of the C–N bond in Ar–NO2 (Ar = Aromatic ring). In addition, the possible mechanism of UV–Vis-induced visible color change was explored for the first time.
      PubDate: 2021-09-01
       
  • Mass Spectrometry-Based Human Breath Analysis: Towards COVID-19 Diagnosis
           and Research

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      Abstract: Abstract COVID-19 is a highly contagious respiratory disease that can be infected through human exhaled breath. Human breath analysis is an attractive strategy for rapid diagnosis of COVID-19 in a non-invasive way by monitoring breath biomarkers. Mass spectrometry (MS)-based approaches offer a promising analytical platform for human breath analysis due to their high speed, specificity, sensitivity, reproducibility, and broad coverage, as well as its versatile coupling methods with different chromatographic separation, and thus can lead to a better understanding of the clinical and biochemical processes of COVID-19. Herein, we try to review the developments and applications of MS-based approaches for multidimensional analysis of COVID-19 breath samples, including metabolites, proteins, microorganisms, and elements. New features of breath sampling and analysis are highlighted. Prospects and challenges on MS-based breath analysis related to COVID-19 diagnosis and study are discussed.
      PubDate: 2021-08-16
       
  • Correction to: DNA Nanotechnology for Multimodal Synergistic Theranostics

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      PubDate: 2021-07-03
       
  • Correction to: Conformer Analysis of a Biological G-Quadruplex Element in
           the Human c-MYC Promoter by Native Polyacrylamide Gel Electrophoresis

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      PubDate: 2021-07-01
       
  • Preparation of Amino-functionalized Guanidinium Ionic Liquid-Modified
           Magnetic Materials and Application in Solid-Phase Extraction of Pollutants
           in Water

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      Abstract: Abstract In the present work, a novel amino-functionalized hexaalkylguanidinium chloride ionic liquid was prepared and grafted on the surface of magnetic materials through polyethyleneimine to enrich polycyclic aromatic hydrocarbons in water in combination with HPLC equipped with an ultraviolet detector. The effect of several parameters on the extraction efficiency was investigated, including the desorption solvent, the amounts of sorbents, the extraction time, the desorption time and the salt amount. Under the optimized conditions, the method validation exhibited good linearity with correlation coefficients above 0.994 in the range of 0.2–300 ng/mL and low limits of detection and quantification of 0.05 and 0.2 ng/mL, respectively. Besides, relative recoveries were in the range of 80–120%, and the intra-day and inter-day repeatability were good with the relative standard deviations of less than 20%. Finally, the guanidinium ionic liquid modified magnetic materials were applied for the extraction of polycyclic aromatic hydrocarbons from real water samples to demonstrate the utility, and the results show that the proposed method has good prospect for effective enrichment and determination of pollutants in water.
      PubDate: 2021-06-24
       
  • Trace Analysis of Anions in Perfluorodecalin by Green Liquid–Liquid
           Extraction Combined with Ion Chromatography

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      Abstract: Abstract Perfluoronaphthenes, with inert chemical and biological properties and ability to dissolve large amounts of oxygen, have received the most attention in medical applications. However, the excessive anion contained may cause some side effects. Herein, liquid–liquid extraction technique with shaking and ultrasonic extraction was used for the trace analysis of five anions (F−, Cl−, NO3−, PO43−, SO42−) in perfluorodecalin using water as green extractant. The optimum pretreatment technology and ion chromatography detection conditions were established. Good linearity was observed in each concentration range, and the linear correlation coefficient (R2) was better than 0.997. The limits of detection (S/N = 3) of five anions from perfluorodecalin were 3.2, 5.5, 14.2, 23.2 and 29.5 μg/L, respectively. The established method with high sensitivity and accuracy has been successfully appliedfor the determination of five anions in three perfluorodecalin products, which provides a basis for further development of green detection and quality standard formulation in perfluorodecalin and other fluorocarbon solvents.
      PubDate: 2021-06-21
       
  • Special Topic: Biomedical Application of DNA-Assembled Nanostructure

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      PubDate: 2021-06-01
       
  • Target Recycling Transcription of Lighting-Up RNA Aptamers for Highly
           Sensitive and Label-Free Detection of ATP

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      Abstract: Abstract We describe here a target recycling transcription of lighting-up aptamer strategy for detecting ATP in human serums in a label-free means with high sensitivity. ATP molecules specifically recognize the binding aptamer and result in the structure switching of the DNA assembly probes to imitate the target ATP molecule recycling cycles through the toehold-mediated strand displacement reaction, which causes the formation of many dsDNAs containing the RNA promoter sequences for subsequent transcription generation of large amounts of lighting-up aptamers. The organic dye, malachite green, then associates with these lighting-up aptamers to produce significantly enhanced fluorescence signals, which can sensitively detect ATP within a dynamic range from 10 to 500 nM in a label-free way. The sensing approach shows a detection limit of 7.3 nM and also has an excellent selectivity for ATP analogue molecules. In addition, this method can detect ATP molecules in diluted human serum samples sensitively, which proves the promising potential to diagnose ATP-related diseases.
      PubDate: 2021-06-01
       
 
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