Subjects -> CHEMISTRY (Total: 928 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (661 journals)
    - CRYSTALLOGRAPHY (23 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (47 journals)
    - PHYSICAL CHEMISTRY (65 journals)

ANALYTICAL CHEMISTRY (59 journals)

Showing 1 - 40 of 40 Journals sorted alphabetically
Accounts of Chemical Research     Hybrid Journal   (Followers: 68)
Acta Analytica     Hybrid Journal   (Followers: 6)
Advances in Analytical Chemistry     Open Access   (Followers: 32)
American Journal of Analytical Chemistry     Open Access   (Followers: 29)
Analitika i kontrol` (Analytics and control)     Open Access  
Analytica Chimica Acta     Hybrid Journal   (Followers: 37)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 24)
Analytical Chemistry     Hybrid Journal   (Followers: 248)
Analytical Chemistry Insights     Open Access   (Followers: 21)
Analytical Chemistry Letters     Hybrid Journal   (Followers: 3)
Analytical Letters     Hybrid Journal   (Followers: 9)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 11)
Chemical Data Collections     Hybrid Journal  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 5)
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: 27)
Current Analytical Chemistry     Hybrid Journal   (Followers: 10)
Drug Testing and Analysis     Hybrid Journal   (Followers: 8)
Electroanalysis     Hybrid Journal   (Followers: 6)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 6)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 7)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 7)
Journal of Analysis and Testing     Hybrid Journal  
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 22)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 8)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 3)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 7)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 27)
Microchemical Journal     Hybrid Journal   (Followers: 4)
Nature Catalysis     Hybrid Journal   (Followers: 10)
Nigerian Journal of Chemical Research     Full-text available via subscription   (Followers: 1)
Opflow     Full-text available via subscription   (Followers: 1)
Phytochemical Analysis     Hybrid Journal   (Followers: 3)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Surface and Interface Analysis     Hybrid Journal   (Followers: 14)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 36)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 3)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 6)
World Journal of Analytical Chemistry     Open Access   (Followers: 4)
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Journal of Analytical Chemistry
Journal Prestige (SJR): 0.265
Citation Impact (citeScore): 1
Number of Followers: 22  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
Published by Springer-Verlag Homepage  [2468 journals]
  • Introduction to the Special Issue

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      PubDate: 2024-06-01
       
  • Voltammetric Determination of Caffeine in Energy Drinks Using an Electrode
           Modified with a Nafion Film and Mixed-Valence Iridium Oxides

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      Abstract: It is found that mixed-valence iridium oxides electrodeposited on the surface of a glassy carbon electrode exhibit catalytic activity in the oxidation of caffeine. In this case, a more pronounced catalytic effect is obtained on an electrode modified with a composite based on a film of a perfluorinated sulfopolymer (Nafion) and mixed-valence iridium oxides. A selective voltammetric method for the determination of caffeine is developed. A linear logarithmic dependence of current on the caffeine concentration is observed in the range from 1 × 10–8 to 5 × 10–3 M. The developed method was used to determine caffeine in energy drinks.
      PubDate: 2024-06-01
       
  • An Electrochemical DNA Sensor for Doxorubicin Based on Graphene Oxide,
           Electropolymerized Azure A, and Methylene Green Composites

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      Abstract: A voltammetric DNA sensor is developed for the determination of doxorubicin, the signal of which is the change in the current of the redox mediator Methylene green, recorded by cyclic voltammetry on a glassy carbon electrode modified by electrochemically reduced graphene oxide, electropolymerized Azure A, and DNA saturated with Methylene green. The influence of the nature of the polymer layer and the redox mediator used on the sensitivity of the determination of doxorubicin is revealed. With an optimal composition of the surface layer, the DNA sensor allows the determination of up to 0.01 pM of doxorubicin. The sensor was tested on a number of model (artificial urine, Ringer−Locke solution, bovine serum albumin solution) and biological samples (saliva, urine) containing doxorubicin.
      PubDate: 2024-06-01
       
  • A Voltammetric Sensor Based on a Chitosan, Graphitized Carbon Black, and
           Molecularly Imprinted Polyarylene Phthalide Composite for Clarithromycin
           Detection

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      Abstract: A voltammetric sensor based on a glassy carbon electrode modified with a chitosan, Carboblack C graphitized carbon black, and molecularly imprinted polyarylene phthalide composite is developed for the selective detection of antibiotic clarithromycin. The polyarylene phthalide used for modification contains diphenylenethio- and diphenylene oxide fragments in a 1 : 2 ratio in the main polymer chain. Clarithromycin-imprinted polyarylene phthalide was obtained using the phase inversion method. The composition and morphology of the modifying coating were investigated by IR spectrometry and scanning electron microscopy. The electrochemical and analytical characteristics of the sensor were investigated by electrochemical impedance spectroscopy, cyclic voltammetry, and differential pulse voltammetry. Optimal conditions for recording the analytical signal were selected. Using [Fe(CN)6]3−/4− as a probe, the linear range of the detected concentrations was found to be 1 × 10–7–5 × 10–4 M with a limit of detection of 5.3 × 10–8 M. Using a clarithromycin-imprinted polymer enhances the sensor sensitivity by nearly tenfold compared to the nonimprinted polymer. The proposed sensor was tested using urine, blood plasma, and various food samples (meat, milk), the recovery values were 90–96, 80, and 92%, respectively, with relative standard deviations not exceeding 10% in all cases.
      PubDate: 2024-06-01
       
  • Voltammetric Sensor Based on Molybdenum-Vanadium-Lithium-Borate Glassy
           Matrix and Its Application for the Determination of Iron in Fortified Milk
           Powder

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      Abstract: A new modified electrode was developed employing an environmentally friendly method to be used in a square-wave voltammetry technique, with advantages such as low cost, rapid response, and high sensitivity, to determine iron in milk powder samples. For this purpose, a novel lab-made electrode based on a borate glassy matrix, doped with molybdenum, lithium, and vanadium oxides, and surface modified with carbon nanoparticles was synthesized. The glassy matrix was obtained by the quenching methodology and the carbon nanoparticles were synthesized using microwave-assisted method and honey as a precursor. The voltammetric behavior of the proposed electrode was evaluated with a potassium hexacyanoferrate(II) solution. Moreover, since iron plays an important role in human nutrition, its quantification in fortified powder milk analysis employing the proposed electrode and square-wave voltammetry was studied. The linear response of iron concentration was in the range of 0.3 to 5.9 mg/L with a limit of detection of 0.18 mg/L. The iron content in the proposed method is in accordance with the inductively coupled plasma atomic emission spectroscopy values and those declared on the label. This electrochemical sensor shows great potential for the determination of iron in food samples and it can be incorporated into a portable device for in situ detection of this analyte.
      PubDate: 2024-06-01
       
  • Statistical Design Approach for Optimizing the Spectrofluorimetric Method
           for Quantifying Trazodone Hydrochloride

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      Abstract: A sensitive spectrofluorimetric method was developed to determine trazodone hydrochloride in its formulation and urine sample. The principle of the developed method is based on the formation of an ion pair complex at a pH of 4.27 between the analyte drug and eosin Y, followed by its extraction into dichloromethane and subsequent fluorescence measurement. The fluorescence of the extracted trazodone-eosin Y complex was recorded at 450 nm with an excitation wavelength of 350 nm. Recording the fluorescence was utilized to construct the calibration plot, which was found to be linear in the range of 32.0–1.50 × 103 ng/mL of trazodone hydrochloride. The influences of experimental variables, namely pH, volumes of eosin Y (2.90 × 10–3 M), and buffer solution (pH 4.27), on the fluorescence intensity were examined and optimized by response surface methodology via Box−Behnken design. The limits of detection and the limit of quantitation of the reported method are 9.50 and 28.79 ng/mL, respectively. The accuracy of the proposed method was evaluated for intra-day and inter-day precision in the range of 0.46 to 0.77% RSD. The content of trazodone hydrochloride in its dosage forms was determined by the developed method using the standard addition technique, and the results showed good recovery between 96.50 and 99.25%, with a standard analytical error of 1.54 × 10–5 to 2.86 × 10–4. Interval hypothesis testing confirmed that it is lower than ±2%; hence, there was no bias between the developed and reference methods. No interference was observed from the common excipients present in tablet formulations. The developed method was also successfully applied for the determination of trazodone in urine samples, and recovery of the drug was observed in the range of 90–98%.
      PubDate: 2024-06-01
       
  • Non-Enzymatic Voltammetric Sensor for Histamine Determination in Saliva
           for Point-of-Care Diagnostics

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      Abstract: The evaluation of histamine levels in saliva can be used as one of the diagnostic criteria for detecting many diseases. Therefore, a sensitive, simple, and low-cost method for determining histamine concentrations is needed for point-of-care diagnostics. In this work, the use of a glassy carbon disk electrode, bulk graphite composite electrode, and graphite screen-printed electrode modified with CuO nanoparticles and CuSO4 for histamine quantification by cyclic voltammetry was studied. The best results were obtained using the screen-printed sensor with the working electrode modified by a CuSO4 aqueous solution and covered with a Nafion-like polymer film. The developed sensor showed a 5 × 10–9 M detection limit with a broad linear range from 5 × 10–9 to 1 × 10–6 M of histamine in a phosphate buffer solution, providing sufficient reliability for saliva analysis after simple sample preparation. The analysis of real saliva samples revealed no significant interfering matrix effect. The total analysis time, including sample preparation, did not exceed 15 minutes.
      PubDate: 2024-06-01
       
  • A Validated Stability-Indicating RP-HPLC Method for the Simultaneous
           Estimation of Aloe Emodin, Aloin, and Emodin in a Marketed Formulation of
           Aloe Vera

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      Abstract: The present analytical study focuses on the simultaneous estimation of Aloe emodin, aloin, and emodin as chemical markers commonly found in herbal formulations using the reversed-phase high-performance liquid chromatography (RP-HPLC) method. Aloin, Aloe emodin, and emodin are active components present in Aloe species, rhubarb, and cascara. A novel method based on RP-HPLC was developed for the simultaneous estimation of these chemical markers. A Waters Alliance-e2695 chromatograph with a 150 × 4.6 mm, 3.5 µm column, a mobile phase with acetonitrile, 0.1% formic acid, and methanol (20 : 50 : 30) were used for this analytical work. The flow rate was 1.0 mL/min, and detection was carried out by a PDA detector with an absorption wavelength of 237 nm at an ambient temperature of 25°C. The linearity ranges for Aloe emodin, aloin, and emodin were found to be 25–150, 12.5–75, and 2.5–15 µg/mL, respectively. The mean recoveries of Aloe emodin, aloin, and emodin were within the acceptance limit (98–102%). The relative standard deviation of precision and robustness was found to be less than 2%. Forced degradation studies were carried out for chemical markers with the help of the developed RP-HPLC method, and no considerable degradants were found. The developed stability-indicating method was applied for the quantification of the three markers in the Ayurvedic formulation of Aloe vera.
      PubDate: 2024-06-01
       
  • Voltammetric Determination of Levofloxacin in Meat and Milk Using a Sensor
           Based on Electroreduced Graphene Oxide and Functionalized Fullerene

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      Abstract: Antibacterial drugs have become an integral part of the food industry and agriculture in the present-day world. The presence of even trace amounts of antibiotics in foods of animal origin can lead to the development of allergic reactions and direct toxic effects in a human body. In this regard, it is necessary to create sensitive and selective procedures for determining antibacterial drugs in order to prevent their excessive consumption. In this work, a glassy carbon voltammetric sensor based on layer-by-layer deposited electroreduced graphene oxide and fullerene functionalized with S-N,N'-bis(1-phenylethyl)malonamide is proposed for the determination of levofloxacin (Lev, S-(-)-ofloxacin) by differential pulse voltammetry. The calibration graph is linear in two ranges, 1.0 × 10–6–6.0 × 10–5 M and 6.0 × 10–5–5.0 × 10–4 M Lev, with sensitivity coefficients of 107 and 58.0 μA/mM, respectively. The limit of detection and limit of quantification are 1.8 × 10–7 and 6.04 × 10–7 M, respectively. The selectivity of the sensor to Lev relative to some fluoroquinolone antibiotics: ciprofloxacin, lomefloxacin, and enrofloxacin, was assessed. The sensor was used to determine Lev in meat and milk using differential pulse voltammetry.
      PubDate: 2024-06-01
       
  • Determination of a Macromolecular Prodrug in Bulk and Microsphere
           Formulation by High Performance Thin Layer Chromatography

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      Abstract: Mycophenolic acid is a secondary metabolite of Penicillium brevicompactum and has been extensively studied for its antineoplastic, immunosuppressive, anti-inflammatory, antiviral, antipsoriasis, and antifungal activities. In the present study, a high-performance thin-layer chromatography method was developed for determining mycophenolic acid and a chitosan-linked prodrug using 60 F254 silica gel plates. The mobile phase used was chloroform–methanol–water (9.2 : 0.7 : 0.1, v/v/v), which provided good separation. The linearity was found to be in the range of 4–12 µg/spot with an R2 value of 0.9973. The percentage of RSD for intra-day and inter-day precision was found to be in the range of 0.7–1.1 and 0.9–2.0, respectively. The limit of detection and limit of quantification of the prodrug were determined to be 0.27 and 0.82 µg/spot, respectively. The recovery of the prodrug obtained was found to be 99.79%, suggesting that the method is simple, accurate, and reproducible. The proposed method proved to be sensitive, accurate, precise, economical, and less time-consuming, making it suitable for successful analysis in microsphere formulations.
      PubDate: 2024-06-01
       
  • Evolution of Contactless Conductometry Methods

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      Abstract: The development of chemical sensor devices operating in non-contact mode is of primary interest due to the demand from various industries for a fast, simple and inexpensive determination of chemical composition in different media in a non-invasive way. One of the promising directions for the development of analytical devices with such characteristics is the use of high-frequency electrical signals. The paper discusses the evolution of high-frequency contactless conductometry method, likewise other methods and devices operating on similar physical principles (dielectric spectroscopy, microwave sensors, C4D detectors).
      PubDate: 2024-06-01
       
  • Capabilities of a Supramolecular System Based on Hexamolybdenum Cluster
           Complexes in the Determination of Amitriptyline in Human Urine Using
           Amperometric Immunosenors

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      Abstract: A method for the determination of amitriptyline, a tricyclic antidepressant, in human urine by immunosensors has been developed using supramolecular systems based on hexamolybdenum cluster complexes. These complexes have electrochemical activity and give a stable analytical signal, which was used in the development of amperometric immunosensors. Luminescence and dynamic light scattering methods were used to demonstrate the formation of a supramolecular system of self-organized hexamolybdenum nanoparticles and chitosan molecules. A composite material based on hexamolybdenum cluster complexes in combination with reduced graphene oxide has been developed. The working range of amitriptyline concentrations to be determined by an amperometric immunosensor was 1 × 10–9–1 × 10–4 M, the limit of determination was at a level of 5 × 10–10 M, and the amitriptyline content of urine samples was at a level of (n – 7) × 10–8 M. A comparison of the results of analysis performed using an amperometric immunosensor and a fluorescence polarization immunoassay showed the absence of significant systematic errors. The ability to determine amitriptyline in biological fluids makes it possible to select an optimal therapeutic dose of the drug, that is, to develop approaches to creating personalized medicine.
      PubDate: 2024-06-01
       
  • Voltammetric Sensors Based on Mesoporous Graphitized Carbon Black and
           Cyclopentadiene Derivatives for Detecting Clopidogrel Enantiomers

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      Abstract: To recognize and determine clopidogrel enantiomers, a sensor system was developed based on a glassy carbon electrode modified with mesoporous Carbopack X carbon black and cyclopentadiene derivatives (1S)-2-cyclopent-2,4-dien-1-yl-1,7,7-trimethylbicyclo[2.2.1]heptane, (1S,2S,4R)-2-cyclopent-1-en-1-yl-1-isopropyl-4-methylcyclohexane, and 9-[(1S,2S,5R)-2-isopropyl-5-methylcyclohexyl]-9H-fluorene. Because of the unique properties of Carbopack X, such as a large surface area and high conductivity, a mechanically stable and a sensitive sensor layer was obtained, which firmly retains chiral selector molecules on its surface. The morphological, electrochemical, and analytical properties of the obtained sensors were studied using scanning electron microscopy, electrochemical impedance spectroscopy, and cyclic and differential pulse voltammetry. Сlopidogrel enantiomers were determined in biological fluids, and linear dependences of oxidation peak currents on their concentration in solution were maintained for all sensors in the concentration range from 1 × 10–6 to 5 × 10–4 M. The sensors exhibited cross-sensitive properties, enabling them to be combined into a sensor array with high enantioselectivity and sensitivity towards clopidogrel enantiomers. Using the proposed sensor array system increases the probability of correctly identifying samples compared to individual sensors. In all cases, the concentration of R-clopidogrel in a mixture was determined correctly with a relative standard deviation not exceeded 9% and recovery ranged from 96 to 102%.
      PubDate: 2024-06-01
       
  • An N-Acetyl-L-Cysteine Impedance Sensor for Assessing Antioxidant Activity
           against Hydroxyl Radicals

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      Abstract: The hydroxyl radical is the most aggressive and dangerous product of incomplete oxygen reduction in a body, making its determination and the effect of various antioxidants on the inhibition of OH radicals a pertinent task. We propose an impedance sensor for the determination of hydroxyl radicals, based on a graphite electrode modified with electrochemically deposited gold and a self-assembled monolayer of N-acetyl-L-cysteine (NAC). The use of NAC ensures the high selectivity of the sensor, and employing non-Faradaic impedance as a method of recording the analytical signal ensures the limit of detection for OH radicals at the level 0.01 nM with a linearity range of detectable concentrations from 0.08 to 8 nM. The developed sensor has been successfully used to assess the activity of certain antioxidants (ascorbic acid, glutathione, coenzyme Q10) towards OH radicals.
      PubDate: 2024-06-01
       
  • An Expeditious and Sensitive Microprecipitation Approach Using Chrome
           Azurol S and Cetyltrimethylammonium Bromide for Visual Detection of Fe(II)
           and Fe(III) in Water

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      Abstract: The aim of this work is to develop a simple, sensitive, and reliable colorimetric test method for the visual detection of Fe(II) and Fe(III) in water. The sample solution of Fe(III) was initially complexed with chromeazurol S (CAS) followed by ion-pair association with cetyltrimethylammonium bromide (CTAB) in the presence of perchlorate ions. This led to the formation of a bulky and insoluble fluffy precipitate involving the physical entrapment of the ternary complex of Fe-CAS-CTAB, which floats on the top of the solution. Depending on the concentration of Fe(III), this type of ternary complex produces an impressive color change from reddish magenta to purple and then to cyan-blue, easily detectable with the naked eye without the need for expensive instrumentation. The ternary-colored complex was formed instantly and remained stable for at least 8 h with constant absorbance. For the determination of total iron and Fe(II), complete oxidation of Fe(II) to Fe(III) was carried out using 100 μL of KMnO4 (0.005%). The minimal response with the test method was found to be about 5 ng/mL of Fe(III) in 2 min of the total sample testing procedure. However, Fe(III) could be quantified using a spectrophotometer after dissolving the fluffy precipitate in toluene solvent. The calibration graph was linear in the range of 5–30 ng/mL of Fe(III) with a correlation coefficient of 0.9931 and a limit of detection of 0.9 ng/mL. The relative standard deviation was found to be less than 6%. At the end of the study, the efficacy of the method was evaluated by its application to groundwater and thermal power plant coolant waters.
      PubDate: 2024-06-01
       
  • Voltammetric Determination of a Potential Antiviral Drug Sodium Salt of
           3-Nitro-4-Hydroxy-7-Methylthio-4H-[1,2,4]Triazolo[5,1-c][1,2,4]Triazinide
           Monohydrate

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      Abstract: Sodium salt of 3-nitro-4-hydroxy-7-methylthio-4H-[1,2,4]triazolo[5,1-c][1,2,4]triazinide mono-hydrate (compound (1)) is one of promising compounds exhibited potential antiviral activity against the Coxsackie B3 virus. Using cyclic voltammetry, it was found that the electrochemical activity of compound 1 on a glassy carbon electrode in a Britton–Robbinson buffer solution (BRB) is due to the electroreduction of the nitro group. A method for determining compound 1 using direct cathodic square-wave voltammetry is developed. The linearity range of the calibration curve using the developed method in a BRB solution (pH 2.0 ± 0.1) is 10–300 mg/L (R2 = 0.999) with the limits of detection and determination being 1.27 and 4.11 mg/L, respectively.
      PubDate: 2024-06-01
       
  • A Voltammetric Sensor Based on Carboxylated Carbon Nanotubes and
           Poly(Pyrogallol Red) for the Determination of Eugenol in Essential Oils

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      Abstract: A voltammetric sensor based on a glassy carbon electrode with a layer-by-layer combination of carboxylated multi-walled carbon nanotubes and electropolymerized pyrogallol red has been developed for the determination of eugenol in essential oils. Conditions for obtaining a poly(pyrogallol red) film in potentiodynamic mode in a neutral medium were optimized to provide the best voltammetric response of eugenol. The electrode was characterized using scanning electron microscopy and a set of electrochemical methods. A significant improvement in the voltammetric characteristics of eugenol on the polymer-modified electrode was shown. The electrooxidation parameters of eugenol were calculated, and it was shown that the reaction proceeded with the formation of o-quinone. Under conditions of differential pulse voltammetry in a Britton–Robinson buffer with pH 2.0, the analytical range of eugenol was 0.75−100 μM with a detection limit of 0.73 μM. High selectivity for the determination of eugenol in the presence of inorganic ions and typical phenolic and terpene components of essential oils has been shown. This approach was successfully tested with eugenol-containing essential oils and compared with an independent method.
      PubDate: 2024-06-01
       
  • Chronoamperometric Determination of Antioxidant Capacity Using an Iron
           Complex with 2,2'-Bipyridine

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      Abstract: The approach for the determination of antioxidants of various hydrophilicity using the complex of the iron(III) with bipyridine as a model oxidizing agent and chronoamperometric recording of the analytical signal is proposed. The choice of the oxidant is determined by its solubility in aqueous, organic and aqueous-organic media. The conditions for recording chronoamperograms are selected: the medium is the acetonitrile-acetate buffer solution (pH 3.6) (9 : 1), the electrolyte is the LiClO4, the potential is E = 1.25 V, the current registration time is 80 s. Antioxidants soluble in organic and aqueous-organic media are studied: α-tocopherol, quercetin, catechin, and caffeic acid. The analytical ranges are (0.5−4) × 10–4 M. The antioxidant capacity (AOC) of ethanol extracts from medicinal plant materials is determined. A high correlation is observed between the AOC values obtained by the chronoamperometric and the spectrophotometric approaches, but only for samples whose intrinsic colors do not contribute to the absorbance of the Fe(II)-bipyridine complex. The application of the proposed approach and the potentiometric method using the K3[Fe(CN)6]/K4[Fe(CN)6] system showed that the values obtained by the potentiometric approach are significantly lower for most of the studied infusions. Thus, it is advisable to analyze multicomponent objects, containing substances of different hydrophilicity, using approaches with oxidizing agents of different solubilities, such as the Fe(III)-bipyridine complex.
      PubDate: 2024-06-01
       
  • Spectrophotometric Determination of Adrenaline, Phenylephrine
           Hydrochloride, and Terbutaline Sulfate Using the Gibbs Reagent

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      Abstract: A spectrophotometric method has been developed for the determination of certain amine-phenol-containing drugs, namely, adrenaline, phenylephrine hydrochloride, and terbutaline sulfate. The method depends on the formation of new products by the reaction of drugs with the Gibbs reagent (2,6-dichloroquinone-4-chloroamide) in a basic borate buffer medium with a pH value of 11. The products were measured at 475, 652.5, and 547 nm for the aforementioned drugs, respectively. Beer–Lambert law was obeyed in the ranges of 0.3–9.5, 0.5–17, and 0.5–55 µg/mL with average recovery of 101.10, 99.13, and 99.78% and a relative standard deviation of ≤3.31%, respectively. The method was free from excipient interferences and applied successfully for the assay of the studied drugs in their pharmaceutical formulations. The resulting products were found in the ratio of 1 : 1.
      PubDate: 2024-06-01
       
  • Amperometric Signal Generation by Self-Doped Polyanilines for
           Ion-Selective Electrodes

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      Abstract: Flow injection amperometry provides an opportunity to avoid common drawbacks of classical potentiometry for solid-contact ion-selective electrodes. The current is generated by solid-contact in course of the polymer chain recharging in response to an excess of cations or anions in the polymer film. Cations cause cathodic peaks on the chronoamperogram, while anions result in anodic peaks. For polyaniline with negatively charged substituents, a response to cations is observed, whereas the presence of uncharged ones results in anion detection. Moreover, in the case of the protonated –SO3H group, this compensating current is an order of magnitude lower than that for the deprotonated one. For electroactive self-doped polyanilines, the maximal amperometric signal is achieved at the working potential within the electroactivity range. The proposed constant potential amperometric approach was validated by the successful analysis of human serum with a Na+-selective electrode based on polyaniline.
      PubDate: 2024-06-01
       
 
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  Subjects -> CHEMISTRY (Total: 928 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (661 journals)
    - CRYSTALLOGRAPHY (23 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (47 journals)
    - PHYSICAL CHEMISTRY (65 journals)

ANALYTICAL CHEMISTRY (59 journals)

Showing 1 - 40 of 40 Journals sorted alphabetically
Accounts of Chemical Research     Hybrid Journal   (Followers: 68)
Acta Analytica     Hybrid Journal   (Followers: 6)
Advances in Analytical Chemistry     Open Access   (Followers: 32)
American Journal of Analytical Chemistry     Open Access   (Followers: 29)
Analitika i kontrol` (Analytics and control)     Open Access  
Analytica Chimica Acta     Hybrid Journal   (Followers: 37)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 24)
Analytical Chemistry     Hybrid Journal   (Followers: 248)
Analytical Chemistry Insights     Open Access   (Followers: 21)
Analytical Chemistry Letters     Hybrid Journal   (Followers: 3)
Analytical Letters     Hybrid Journal   (Followers: 9)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 11)
Chemical Data Collections     Hybrid Journal  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 5)
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: 27)
Current Analytical Chemistry     Hybrid Journal   (Followers: 10)
Drug Testing and Analysis     Hybrid Journal   (Followers: 8)
Electroanalysis     Hybrid Journal   (Followers: 6)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 6)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 7)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 7)
Journal of Analysis and Testing     Hybrid Journal  
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 22)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 8)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 3)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 7)
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