scholarly journals Determination of phenolic acids and flavonoids in leaves, calyces, and fruits of Physalis angulata L. in Viet Nam

Pharmacia ◽  
2021 ◽  
Vol 68 (2) ◽  
pp. 501-509
Author(s):  
Kim-Ngan Huynh Nguyen ◽  
Ngoc-Van Thi Nguyen ◽  
Kyeong Ho Kim
Keyword(s):  
Formic Acid ◽  
Phenolic Acids ◽  
Ammonium Acetate ◽  
Gradient Elution ◽  
Viet Nam ◽  
Coumaric Acid ◽  
Aerial Parts ◽  
Physalis Angulata ◽  
Detection And Quantification

In Vietnam, Physalis angulata L. is a wild species growing throughout the country that is often used in traditional medicine. The aim of study was to quantify seven major compounds, including phenolic acids (chlorogenic acid, caffeic acid, p-coumaric acid) and flavonoids (rutin, quercitrin, quercetin, and kaempferol) in three aerial parts of P. angulata. Chromatographic separation was carried out on a Kromasil C18 column (150 mm × 4.6 mm i.d., 5 µm) with a gradient elution of 0.1% formic acid in acetonitrile, 0.2% ammonium acetate/0.1% formic acid in water and methanol at a flow rate of 1.0 mL/min; detection was at 250 and 300 nm. The limits of detection and quantification were in the ranges of 0.1–0.3 and 0.3–1.0 µg/mL, respectively. The validated method was successfully applied to analyze active compounds in P. angulata and may be a useful tool for quality control of this plant.

LC–MS/MS Determination of Apigenin in Rat Plasma and Application to Pharmacokinetic Study

2020 ◽  
Vol 21 ◽  
Author(s):  
Shixing Zhu ◽  
Jiayuan Zhang ◽  
Zhihua Lv ◽  
Mingming Yu
Keyword(s):  
Formic Acid ◽  
Pharmacokinetic Study ◽  
Ammonium Acetate ◽  
Rat Plasma ◽  
Biological Properties ◽  
Plasma Samples ◽  
Supply Rate ◽  
Natural Plant ◽  
Ammonium Acetate Buffer

Background: Apigenin, a natural plant flavone, has been shown to possess a variety of biological properties. Objective: In this report, a highly selective and sensitive LC-MS/MS method was developed and validated for the determination of apigenin in rat plasma. Methods: Analysts were separated on the HSS T3 column (1.8 μm 2.1×100 mm) using acetonitrile and 0.1% formic acid in 2 mM ammonium acetate buffer at a supply rate of 0.200 mL/min as eluent in gradient model. Results: Plasma samples were treated by protein precipitation using acetonitrile for the recovery ranging from 86.5% to 90.1% for apigenin. The calibration curves followed linearity in the concentration range of 0.50-500 ng/mL. The inter-day and intra-day precisions at different QC levels within 13.1% and the accuracies ranged from -10.6% to 8.6%. Conclusion: The assay has been successfully applied to the pharmacokinetic study of apigenin in rats.

scholarly journals Determination of Triterpenoids and Phenolic Acids from Sanguisorba officinalis L. by HPLC-ELSD and Its Application

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4505
Author(s):  
Jiahui Sun ◽  
Chunli Gan ◽  
Jing Huang ◽  
Zhenyue Wang ◽  
Chengcui Wu ◽  
...  
Keyword(s):  
Phenolic Acids ◽  
High Performance ◽  
Gradient Elution ◽  
Light Scattering Detection ◽  
Evaporative Light Scattering ◽  
Acetic Acid Water ◽  
Sanguisorba Officinalis ◽  
Functional Components ◽  
Gradient Elution Mode

A novel analytical method involving high-performance liquid chromatography with evaporative light scattering detection (HPLC-ELSD) was developed for simultaneous determination of 11 phenolic acids and 12 triterpenes in Sanguisorba officinalis L. Chromatographic separation was conducted with gradient elution mode by using a DiamonsilTM C18 column (250 mm × 4.6 mm, 5 μm) with the mobile phase of 0.1% acetic acid water (A) and methanol (B). The drift tube temperature of ELSD was set at 70 °C and the nitrogen cumulative flow rate was 1.6 L/min. The method was fully validated to be linear over a wide concentration range (R2 ≥ 0.9991). The precisions (RSD) were less than 3.0% and the recoveries were between 97.7% and 101.4% for all compounds. The results indicated that this method is accurate and effective for the determination of 23 functional components in Sanguisorba officinalis L. and could also be successfully applied to study the influence of processing method on those functional components in Sanguisorba officinalis L.

scholarly journals DETERMINATION OF SULFONAMIDES IN CHICKEN MEAT BY SOLID PHASE EXTRACTION AND HIGH PERFORMANCE LIQUID CHROMATOGRAPHY

1970 ◽  
Vol 63 ◽  
Author(s):  
C. T. Matea ◽  
C. Bele ◽  
F. Dulf
Keyword(s):  
High Performance ◽  
Ammonium Acetate ◽  
Solid Phase ◽  
Simultaneous Detection ◽  
Gradient Elution ◽  
Normal Phase ◽  
Chicken Meat ◽  
Liquid Liquid Extraction ◽  
Halogenated Solvents

This paper describes a method for the simultaneous detection and quantification of six sul-fonamides in chicken meat using normal phase cartridge clean-up and HPLC with UV detection . A liquid – liquid extraction and Sep- Pak silica clean-up procedure which minimizes the presence of halogenated solvents was used for sample preparation . The HPLC determination was performed using a RP C 18 column and sulfonamides were detected at 266 nm. Mobile phase was 0.01 M ammonium acetate pH 4.6 ( A ) and methanol ( B). Chromatographic separation was obtained by gradient elution ( 22 % B to 50 % within 17 min , back to 22 % in 2 min, equilibration for 5 min).Average recoveries of analytes from spiked meat were higher than 74 % .

scholarly journals Development and validation of a rapid selective high-throughput LC-MS/MS method for the determination of triclabendazole sulfoxide concentrations in sheep plasma and its use in bioequivalence studies

2021 ◽  
Author(s):  
Lénárd Farczádi ◽  
Álmos Dósa ◽  
Orsolya Melles ◽  
Laurian Vlase
Keyword(s):  
Formic Acid ◽  
Flow Rate ◽  
Mobile Phase ◽  
Liver Fluke ◽  
Internal Standard ◽  
Gradient Elution ◽  
Sample Processing ◽  
Development And Validation ◽  
Analytical Separation

AbstractTriclabendazole is one of the main drugs used to treat liver fluke in livestock. A rapid LC-MS/MS method was developed and validated to determine ovine plasma levels of triclabendazole sulfoxide.A Gemini NX-C18 column was used to achieve analytical separation, with gradient elution of a mobile phase composed of 0.1% formic acid in acetonitril and 0.1% formic acid in water at flow rate of 0.6 mL/min. MRM with positive ESI ionization was used for the detection of triclabendazole sulfoxide (m/z 360.10 from m/z 376.97). Fenbendazole was used as internal standard. Plasma protein precipitation with acetonitrile was used for sample processing.The method was validated with regards to selectivity, linearity (r > 0.9939), within run and between run precision (CV < 8.9%) and accuracy (bias < 8.9%) over the concentration range 1–100 µg/mL plasma.The method developed is simple, selective and can be applied in bioequivalence and bioavailability studies.

scholarly journals Determination of sibutramine and phenolphthalein in weight­loss tea, coffee, and milk by ultra-­performance liquid chromatography mass spectrometry UPLC­-MS/MS

2019 ◽  
Vol 2 (4) ◽  
pp. 42-48
Author(s):  
Than Truong Van ◽  
Duy Nguyen Thanh ◽  
Kiet Ly Tuan ◽  
Vinh Hoang Ngoc ◽  
Hai Chu Van ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Formic Acid ◽  
Gradient Elution ◽  
Ultra Performance Liquid Chromatography ◽  
Distilled Water ◽  
Liquid Chromatography Mass Spectrometry ◽  
Ms Detection ◽  
Chromatography Mass Spectrometry

A rapid, simply and effective method using ultra&shy;performance liquid chromatography coupled to mass spectrometry (MS) detection was developed in order to determine sibutramine and phenolphthalein in weight&shy;loss tea, coffee, and milk. QuEChERS technique was used for cleaning&shy;up sample matrices. The extracts were separated on C18 LC columns using the gradient elution of 0.1% formic acid in distilled water and acetonitrile. The recoveries at the concentration of 50 &micro;g/kg were from 90.1 to 105.8% (with RSDR of 4.04 &shy; 4.24%), from 91.9 to 100.2% (with RSDR of 3.20 &shy; 4.71%), and from 86.5 to 100.5% (with RSDR of 5.17 &shy; 5.49%) for weight&shy;loss tea, coffee, and milk, respectively. Method quantitation limits were of 30 &micro;g/kg.

scholarly journals A Validated UPLC-PDA Method for Simultaneous Determination of 3 Biologically Active Isoflavans in Trigonella stellata Extract

2020 ◽  
Vol 15 (7) ◽  
pp. 1934578X2094011
Author(s):  
Safa M. Shams Eldin ◽  
Mohamed M. Radwan ◽  
Amira S. Wanas ◽  
Abdel-Azim M. Habib ◽  
Fahima F. Kassem ◽  
...  
Keyword(s):  
Formic Acid ◽  
Simultaneous Determination ◽  
Correlation Coefficients ◽  
Gradient Elution ◽  
Ultra Performance Liquid Chromatography ◽  
Biologically Active ◽  
External Standard Method ◽  
Acid Aqueous Solution ◽  
Acquity Uplc

In this study, an ultra-performance liquid chromatography (UPLC)/photodiode array method was developed for the simultaneous determination of trigonellan glucoside (1), isotrigonellan (2), and methoxy-isotrigonellan (3) in Trigonella stellata extract using an external standard method. The extract was prepared using a standardized method by maceration of the dried plant material in ethanol. The 3 isoflavans (1-3) were separated on an Acquity UPLC C18 column using gradient elution with a mobile phase consisting of 0.1% (v/v) formic acid aqueous solution and 0.1% (v/v) formic acid in acetonitrile, and ultraviolet detection. The method provides a linear correlation for all analytes over the investigated ranges with all correlation coefficients greater than 0.998. The validated lower limits of quantitation were 53, 127, and 5 μg/mL for isoflavans 1, 2, and 3, respectively. Intraday and interday precisions (percent relative SD [RSD%]) were less than 8.3% and accuracy (RE%) ranged from 90% to 100%. The method’s capability to remain unaffected by small, but deliberate variations in method parameters (method’s reliability during normal usage) described by the robustness showed RSD% less than 4.6% measured by varying 3 different parameters. The validated method was successfully applied to simultaneously determine the concentration of the 3 new isoflavans having anti-inflammatory and antidiabetic activities. The results revealed that the validated method can be used for quality control of herbal preparations containing these or similar isoflavans that are marketed for the prevention of inflammation and as antidiabetics.

scholarly journals Development and Validation of a Stability Indicating LC Method for the Assay and Related Substances Determination of a Proteasome Inhibitor Bortezomib

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Kasa Srinivasulu ◽  
Mopidevi Narasimha Naidu ◽  
Kadaboina Rajasekhar ◽  
Murki Veerender ◽  
Mulukutla Venkata Suryanarayana
Keyword(s):  
Formic Acid ◽  
Mobile Phase ◽  
Gradient Elution ◽  
Hplc Method ◽  
Forced Degradation ◽  
Balance Study ◽  
Stability Indicating ◽  
Related Substances ◽  
Mass Balance Study

A novel, simple, sensitive, stability indicating HPLC method was developed and validated for quantification of impurities (process related and degradants) and assay determination of bortezomib. Stability indicating power of the method was established by forced degradation experiments and mass balance study. The chromatographic separation was achieved with Waters SymmetryShield RP18 column using gradient elution using the mobile phase-A consists of a mixture of water-acetonitrile-formic acid (715 : 285 : 1, v/v/v) and the mobile phase-B consists a mixture of methanol-water-formic acid (800 : 200 : 1, v/v/v), respectively. The developed method is validated for parameters like precision, accuracy, linearity, LOD, LOQ, and ruggedness. Central composite experimental design (CCD) was applied to check the robustness of the method. The stability tests were also performed on drug substances as per ICH norms.

scholarly journals DETERMINATION OF Cu(II) CONCENTRATION IN AQUEOUS MEDIUM USING INVERSION ELECTROCHEMICAL METHOD

2019 ◽  
Vol 85 (9) ◽  
pp. 58-64
Author(s):  
Vera Vorobets ◽  
Gennadii Kolbasov ◽  
Sergii Fomanyuk ◽  
Nataliia Smirnova ◽  
Oksana Linnik
Keyword(s):  
Formic Acid ◽  
Ammonium Acetate ◽  
Copper Ions ◽  
Stripping Voltammetry ◽  
Acetate Buffer ◽  
Background Solution ◽  
Ammonium Acetate Buffer ◽  
Photoelectrochemical Method ◽  
Determination Of Copper

Electrode materials based on titanium dioxide modified with zinc ions and gold nanoparticles, synthesized by sol-gel method, were used to determine the concentration of Cu (II) in liquids by stripping voltammetry method. Determination of Cu (II) was done using background solutions based on 0.4 M formic acid and ammonium acetate buffer (pH = 7.5) using the standard addition method with a potential scanning speed of 50 mV•s-1. The solution was stirred during the preliminary electrolysis at a potential of -1400 mV (vs silver-chloride reference electrode) for 120 seconds and then the potential was scanned from -1200 mV to + 200 mV. It is shown that the background solution based on ammonium acetate buffer provides a higher sensitivity and a good selectivity of peaks for the determination of copper compared to the background solution based on formic acid. Determined that value of the analytical signal of copper in the studied model solutions based on ammonium acetate and formic acid is proportional to the concentration of copper ions in the solution. To increase the selectivity of stripping voltammetry method in determining copper concentrations in solutions, an inversion spectral photoelectrochemical method was proposed, the essence of which is preliminary electroconcentration of the elements under investigation in the cathode potential region and subsequent measurement of the spectral photoelectrochemical characteristics of electroconcentration products. It has been found that in solutions of 1M ammonium acetate containing Cu2+ ions, the cathodic polarization of TiO2-based photoelectrode leads to the appearance of a cathode photocurrent and the values of photocurrent quantum yield increase with increasing content of copper ions in the solution. The spectral sensitivity of the surface layer corresponds to the absorption spectrum of Cu2O. The sensitivity of stripping voltammetry method to copper Cu (II) using the materials studied was 0.3 mg•l-1. It is shown that the inversion photoelectrochemical method is promising in the selective determination of copper concentration in liquids.

scholarly journals THE DEVELOPMENT AND VALIDATION OF THE METHOD TO QUANTIFY THE AMOUNT OF PHENOLIC ACIDS IN AERIAL PARTS OF ZIZIPHORA CLINOPODIOIDES LAM.

2019 ◽  
pp. 161-168 ◽  
Author(s):  
Valeriya Yur'yevna Andreeva ◽  
Galina Il'inichna Kalinkina ◽  
Valeriya Vladimirovna Li
Keyword(s):  
Quantitative Determination ◽  
Phenolic Acids ◽  
Aerial Part ◽  
Raw Material ◽  
Alcoholic Extract ◽  
Extraction Temperature ◽  
Aerial Parts ◽  
Highly Sensitive ◽  
Development And Validation

Development and validation of method for quantitative determination of the amount of phenolic acids in the aerial part of the Ziziphora clinopodioides Lam. Objective: to develop and conduct a validation assessment of the method for determining the content of the amount of phenolic acids in the Ziziphora clinopodioides. The method of quantification of phenolic acids equivalent to chlorogenic acid by direct spectrophotometry in aerial parts of the Ziziphora clinopodioides has been developed based on the study of the absorption spectrum of an aqueous-alcoholic extract. The influence of the following factors on the yield of phenolic acids was studied: the nature of the extractant, the ratio of raw material: extractant, the degree of particle fineness, the extraction multiplicity, the extraction temperature; their optimum values were established. The method of quantitative determination of the amount of phenolic acids in the aerial part of the Ziziphora clinopodioides is validated; it has been established that the proposed method is highly sensitive, correct, reproducible and suitable for use in an analytical laboratory based on the data obtained.

scholarly journals Analytical profiling and structure elucidation of flavanoids compounds

2019 ◽  
pp. 7-12
Author(s):  
Rajni Singh Khureja ◽  
Dinesh Kumar
Keyword(s):  
Acetic Acid ◽  
Formic Acid ◽  
Ethyl Acetate ◽  
Structure Elucidation ◽  
Uv Light ◽  
Methyl Ethyl ◽  
Aerial Parts ◽  
Acetate Methyl ◽  
Layer Chromatography

Chromatography is a powerful analytical method suitable for the separation and quantitative determination of a considerable number of compounds, even from complicated matrix. Thin Layer Chromatography (TLC) has some advantages such as rapidity, sensitivity, easiness, cheapness and this method does not require complex instrumental equipment. In present study, Quercetin 3 -O -α- d- glucuro pyranoside (miquelianin; QG), quercetin 3-O-α-d glucopyranoside (isoquercitrin), quercetin 3-O-α-d-galactopyranoside (hyperoside) and rutin in ethyl acetate fractions from aerial parts of selected Potentilla species on a HPTLC plates using a mixture consisting of ethyl acetate/methyl ethyl ketone/diisopropyl ether/formic acid (3:10:4:1, v/v/v/v). Rutinosides and quercetin were also eluted using methanol-water-acetic acid (50/44/6, v/v/v) and benzene: pyridine: formic acid (36:9:5). The spot visualization was evaluated under UV light at 254 nm and Ferric chloride reagent.

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