scholarly journals Synthesis, characterization, and pharmacological evaluation of some metal complexes of quercetin as P-gp inhibitors

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Kirankumar Shastrala ◽  
Sirisha Kalam ◽  
Kumaraswamy Damerakonda ◽  
Sharvana Bhava Bandaru Sheshagiri ◽  
Hitesh Kumar ◽  
...  
Keyword(s):  
Small Intestine ◽  
Metal Complexes ◽  
Mobile Phase ◽  
Hplc Method ◽  
Rat Intestine ◽  
Apparent Permeability ◽  
Rp Hplc ◽  
The Mean ◽  
Pre Treatment

Abstract Background Six different metal complexes of quercetin (Cu, Zn, Co, Vd, Mo, Ni) were synthesized, purified, and characterized by their physical and spectral (UV, IR) data. They were evaluated for their P-gp (permeability glycoprotein) inhibitory activity by in vitro everted sac method in rats. The apparent permeability of atorvastatin (P-gp substrate) from everted sac of the rat intestine was determined in control, standard (verapamil), and groups treated with quercetin-metal complexes. The drug contents were analyzed by validated RP-HPLC method using a mixture of acetonitrile and water (60:40 v/v) adjusted to pH 2.8 with phosphate buffer as mobile phase. Results In vitro studies revealed that the apparent permeability of atorvastatin (P-gp substrate) across the small intestine is much affected by the treatment with Cu/Co/Ni complexes of quercetin. The mean ± SD and apparent permeability of atorvastatin decreased after pre-treatment with these metal complexes. Conclusions The quercetin Cu/Co/Ni complexes could inhibit P-gp and increase the atorvastatin absorption. Hence, they could be considered P-gp inhibitors.

scholarly journals DEVELOPMENT AND VALIDATION OF A RP-HPLC METHOD FOR DETERMINATION OF ERDAFITINIB IN MARKETED FORMULATIONS

2020 ◽  
Vol 9 (3) ◽  
Author(s):  
M. Maithani ◽  
D. Dwivedi ◽  
D. Hatwal ◽  
P. Bansal
Keyword(s):  
Mobile Phase ◽  
Pharmaceutical Preparations ◽  
Hplc Method ◽  
Sodium Acetate Buffer ◽  
Rp Hplc ◽  
The Mean ◽  
Uv Visible ◽  
Development And Validation ◽  
Tablet Dosage

A simple and precise RP-HPLC method for the estimation of Erdafitinib in tablet dosage form was developed and validated. The chromatographic separation of the drug was done with a Hypersil™ ODS C18 Column (150 mm × 4.6 mm i.d., particle size 5 μ) using 20mM sodium acetate buffer (pH 4. ±0.02), methanol and acetonitrile (60:10:30 v/v/v) as a mobile phase. The instrument was set at flow rate of 1.0 mLmin-1 at ambient temperature and the wavelength of UV-visible detector at 310nm. The method showed excellent linearity over a range of 5-35 μgmL-1 for the drug. The correlation coefficient for Erdafitinib was noted to be 0.9999. The mean recovery values were found to be 99.77% and 100.88%. The results suggest that the proposed method could be suitable for quantitative determination of Erdafitinib in pharmaceutical preparations and also for quality control in bulk manufacturing. The F-test and t-test at 95% confidence level were applied on data for statistical analysis.

High-Performance Liquid Chromatography Quantification of Principal Antioxidants in Black seed (Nigella sativa L.) Phytopharmaceuticals

2012 ◽  
Vol 95 (4) ◽  
pp. 1043-1047 ◽  
Author(s):  
Ghada M Hadad ◽  
Randa A Abdel Salam ◽  
Rabab M Soliman ◽  
Mostafa K Mesbah
Keyword(s):  
Quality Control ◽  
High Performance Liquid Chromatography ◽  
Mobile Phase ◽  
High Performance ◽  
Nigella Sativa ◽  
Hplc Method ◽  
Rp Hplc ◽  
Marker Substances ◽  
The Mean

Abstract A new, simple, sensitive, rapid, and accurate isocratic RP-HPLC method was developed and validated for simultaneous analysis of the principal antioxidants of Nigella sativa, i.e., thymoquinone (TQ), carvacrol (CR), and its isomer thymol (THY), in different phytopharmaceuticals. The mobile phase was water–methanol (40 + 60, v/v) at a flow rate of 1.5 mL/min. Quantification was achieved with UV detection at 254 nm, based on peak area. The method was validated for linearity, accuracy, precision, selectivity, and robustness. The proposed method is stability-indicating for determination of TQ in the presence of its degradants. The LOD and LOQ (μg/mL) were, respectively, 0.006 and 0.021 for TQ, 0.002 and 0.006 for CR, and 0.027 and 0.090 for THY. The mean recoveries measured at three concentrations were higher than 99%, with RSD <2%. This analytical method is suitable for quality control of the marker substances in this widely used natural protective and curative remedy.

scholarly journals Liquid Chromatographic Method for the Simultaneous Determination of Eprosartan and Hydrochlorothiazide in Tablets and Human Plasma

2011 ◽  
Vol 94 (3) ◽  
pp. 823-832 ◽  
Author(s):  
Fathalla Belal ◽  
Amina M El-Brashy ◽  
Nahed El-Enany ◽  
Manar M Tolba
Keyword(s):  
Simultaneous Determination ◽  
Human Plasma ◽  
Mobile Phase ◽  
Hplc Method ◽  
Rp Hplc ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic

Abstract A new, specific, and sensitive RP-HPLC method was developed for the simultaneous determination of eprosartan (EPR) and hydrochlorothiazide (HCT). Good chromatographic separation was achieved using a 250 × 4.6 mm id, 5 μm particle size Symmetry® C18 column. The mobile phase acetonitrile–0.1 M phosphate buffer (35 + 65, v/v), pH 4.5, was pumped at a flow rate of 1 mL/min, with UV detection at 275 nm. The method showed good linearity in the ranges of 0.5–50 and 0.1–10 μg/mL, with LOD of 0.06 and 0.02 μg/mL and LOQ of 0.20 and 0.08 μg/mL for EPR and HCT, respectively. The proposed method was successfully applied for the analysis of the studied drugs in their synthetic mixture and co-formulated tablets. The method was further extended to the in vitro and in vivo determination of the two drugs in spiked and real human plasma. Interference likely to be encountered from the co-administered drugs was studied.

RP-HPLC METHOD FOR SIMULTANEOUS ESTIMATION OF ASPIRIN AND OMEPRAZOLE IN BINARY COMBINATION

INDIAN DRUGS ◽  
2018 ◽  
Vol 55 (08) ◽  
pp. 38-43
Author(s):  
A. M Kashid ◽  
◽  
S. V. Tathe ◽  
S. G. Sahoo ◽  
A. B. Ghatge ◽  
...  
Keyword(s):  
Mobile Phase ◽  
Correlation Coefficients ◽  
Hplc Method ◽  
Simultaneous Estimation ◽  
Sodium Acetate Buffer ◽  
Rp Hplc ◽  
Ich Guidelines ◽  
Precision Study ◽  
The Mean

A simple, accurate, rapid and precise RP-HPLC method for the simultaneous estimation of aspirin and Omeprazole in binary mixture has been developed and validated. The drugs were resolved using HPLC column (ACE 250 x 4.6 mm C18 column) with mobile phase of HPLC grade methanol: Sodium acetate buffer (70:30 v/v) at a flow rate of 1 mL/min. The retention times of aspirin and omeprazole were 3.10 ± 0.3min and 5.01 ± 0.02min with UV detection at 230 nm. The method was validated with respect to linearity, sensitivity, accuracy, precision and robustness as per the International Conference on Harmonization (ICH) guidelines. The method was specific and it was observed that no interference with diluents. The linearity was established over the concentration range of 40-140μg/ml and 20-120μg/mL with correlation coefficients (r2) 0.9998 and 0.9986 for aspirin andomeprazole magnesium respectively. The mean recoveries were found to be in the range of 97.05%-99.75% and 97.21% -98.76% for aspirin and omeprazole respectively. The % R.S.D. values for intra-day precision study and inter-day study were <1.0%, confirming that the method is precise. The method can be successfully employed for the simultaneous determination of aspirin and omeprazole.

scholarly journals A Validated RP-HPLC Method for the Estimation of Quetiapine in Bulk and Pharmaceutical Formulations

2010 ◽  
Vol 7 (s1) ◽  
pp. S261-S266 ◽  
Author(s):  
D. Suneetha ◽  
A. Lakshmana Rao
Keyword(s):  
Mobile Phase ◽  
Orthophosphoric Acid ◽  
Limit Of Detection ◽  
Pharmaceutical Formulations ◽  
Hplc Method ◽  
Detector Response ◽  
Control Analysis ◽  
Rp Hplc ◽  
Limit Of Quantitation ◽  
The Mean

A new, simple, specific, sensitive, rapid, accurate and precise RP-HPLC method was developed for the estimation of quetiapine in bulk and pharmaceutical formulations. Quetiapine was chromatographed on a reverse phase C18Waters column (75x4.6 mm I.D., particle size 3.5 μm) in a mobile phase consisting of phosphate buffer (pH 3.0 adjusted with orthophosphoric acid) and acetonitrile in the ratio 40:60 v/v. The mobile phase was pumped at a flow rate of 0.8 mL/min with detection at 291 nm. The detector response was linear in the concentration of 20-120 μg/mL. The limit of detection and limit of quantitation was found to be 0.2 and 0.75 μg/mL, respectively. The intra and inter day variation was found to be less than 1%. The mean recovery of the drug from the solution was 99%. The proposed method is simple, fast, accurate, precise and reproducible hence, it can be applied for routine quality control analysis of quetiapine in bulk and pharmaceutical formulations.

A comparative technique using as Joint studying to prove structure and determination the Quantitative estimation of organic compound (Irbesartan) as drug in multicomponent tablet form

2019 ◽  
Vol 9 (o3) ◽  
Author(s):  
Imad Tarek Hanoon ◽  
Abed Mohammed Daheir AL-Joubory 2 ◽  
Marwa Mohamed Saied 3
Keyword(s):  
Mobile Phase ◽  
Chemical Structure ◽  
Quantitative Estimation ◽  
Potassium Phosphate ◽  
Hplc Method ◽  
Pharmaceutical Dosage Forms ◽  
Tablet Form ◽  
Rp Hplc ◽  
Percent Recovery

A simple , specific, accurate and precise RP-HPLC method was developed for determination of Irbesartan (IRB) in pharmaceutical dosage forms in tablets products and sachet using symmetry (L 1 ) column at 30°C . The signal was detected at 225 nm. A mobile phase dissolve 0.5 g of buffer potassium phosphate in 100 ml distilled water and adjust pH 2.7 , methanol and acetonitrile at ratio (40 :30 :30 ) . and flow rate 1.2ml/min -1 at pH=7.2 a mobile phase The percent recovery was detected 101 % and the linearity of concentration was 10-50 µg.ml -1 and supported this method by using (FT.I.R.) spectrum method for organic spectrophotometer to prove the chemical structure of this drug and some physical properties . we are obtained the result is identical of other literature . The proposed method was applied successfully for determination of the IRB in tablets products.

In-vitro Kinetic Hydrolysis Study of Metronidazole Derivatives with Carvacrol and Eugenol Using Validated RP-HPLC Method

2020 ◽  
Vol 16 ◽  
Author(s):  
M. Alarjah
Keyword(s):  
Half Life ◽  
Hplc Method ◽  
Hydrolysis Rate ◽  
First Order ◽  
First Order Kinetics ◽  
Rp Hplc ◽  
Pharmacokinetic Properties ◽  
Pseudo First Order ◽  
Kinetic Hydrolysis

Background: Prodrugs principle is widely used to improve the pharmacological and pharmacokinetic properties of some active drugs. Much effort was made to develop metronidazole prodrugs to enhance antibacterial activity and or to improve pharmacokinetic properties of the molecule or to lower the adverse effects of metronidazole. Objective: In this work, the pharmacokinetic properties of some of monoterpenes and eugenol pro metronidazole molecules that were developed earlier were evaluated in-vitro. The kinetic hydrolysis rate constants and half-life time estimation of the new metronidazole derivatives were calculated using the validated RP-HPLC method. Method: Chromatographic analysis was done using Zorbbax Eclipse eXtra Dense Bonding (XDB)-C18 column of dimensions (250 mm, 4.6 mm, 5 μm), at ambient column temperature. The mobile phase was a mixture of sodium dihydrogen phosphate buffer of pH 4.5 and methanol in gradient elution, at 1ml/min flow rate. The method was fully validated according to the International Council for Harmonization (ICH) guidelines. The hydrolysis process carried out in an acidic buffer pH 1.2 and in an alkaline buffer pH 7.4 in a thermostatic bath at 37ºC. Results: The results followed pseudo-first-order kinetics. All metronidazole prodrugs were stable in the acidic pH, while they were hydrolysed in the alkaline buffer within a few hours (6-8 hr). The rate constant and half-life values were calculated, and their values were found to be 0.082- 0.117 hr-1 and 5.9- 8.5 hr., respectively. Conclusion: The developed method was accurate, sensitive, and selective for the prodrugs. For most of the prodrugs, the hydrolysis followed pseudo-first-order kinetics; the method might be utilised to conduct an in-vivo study for the metronidazole derivatives with monoterpenes and eugenol.

scholarly journals Box-Behnken Assisted Validation and Optimization of an RP-HPLC Method for Simultaneous Determination of Domperidone and Lansoprazole

Separations ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 5
Author(s):  
Mohd Afzal ◽  
Mohd. Muddassir ◽  
Abdullah Alarifi ◽  
Mohammed Tahir Ansari
Keyword(s):  
Flow Rate ◽  
Mobile Phase ◽  
Limit Of Detection ◽  
Hplc Method ◽  
Box Behnken Design ◽  
Rp Hplc ◽  
System Suitability ◽  
Method Optimization ◽  
Key Variables

A highly specific, accurate, and simple RP-HPLC technique was developed for the real-time quantification of domperidone (DOMP) and lansoprazole (LANS) in commercial formulations. Chromatographic studies were performed using a Luna C8(2), 5 μm, 100Å, column (250 × 4.6 mm, Phenomenex) with a mobile phase composed of acetonitrile/2 mM ammonium acetate (51:49 v/v), pH 6.7. The flow rate was 1 mL·min−1 with UV detection at 289 nm. Linearity was observed within the range of 4–36 µg·mL−1 for domperidone and 2–18 µg·mL−1 for lansoprazole. Method optimization was achieved using Box-Behnken design software, in which three key variables were examined, namely, the flow rate (A), the composition of the mobile phase (B), and the pH (C). The retention time (Y1 and Y3) and the peak area (Y2 and Y4) were taken as the response parameters. We observed that slight alterations in the mobile phase and the flow rate influenced the outcome, whereas the pH exerted no effect. Method validation featured various ICH parameters including linearity, limit of detection (LOD), accuracy, precision, ruggedness, robustness, stability, and system suitability. This method is potentially useful for the analysis of commercial formulations and laboratory preparations.

scholarly journals RP-HPLC Determination of Raloxifene in Pharmaceuticl Tablets

2006 ◽  
Vol 3 (1) ◽  
pp. 60-64 ◽  
Author(s):  
P. Venkata Reddy ◽  
B. Sudha Rani ◽  
G. Srinu Babu ◽  
J. V. L. N. Seshagiri Rao
Keyword(s):  
Flow Rate ◽  
Retention Time ◽  
Mobile Phase ◽  
Dosage Forms ◽  
Hplc Method ◽  
Reverse Phase Hplc ◽  
Reverse Phase ◽  
Pharmaceutical Dosage Forms ◽  
Rp Hplc

A reverse phase HPLC method is developed for the determination of Raloxifene in pharmaceutical dosage forms. Chromatography was carried out on an inertsil C18 column using a mixture of acetonitrile and phosphate buffer (30:70 v/v) as the mobile phase at a flow rate of 1 mL/min. Detection was carried out at 290 nm .The retention time of the drug was 10.609 min. The method produced linear responses in the concentration range of 0.5-200 µg/mL of Raloxifene. The method was found to be applicable for determination of the drug in tablets.

NEW VALIDATED RP-HPLC METHOD FOR THE DETERMINATION OF RIZATRIPTAN BENZOATE IN BULK AND PHARMACEUTICAL DOSAGE FORM

INDIAN DRUGS ◽  
2014 ◽  
Vol 51 (12) ◽  
pp. 32-36
Author(s):  
T. Vishalakhi ◽  
◽  
S. K Kumar ◽  
K Sujana ◽  
P Rani
Keyword(s):  
Mobile Phase ◽  
Dosage Form ◽  
Hplc Method ◽  
Detector Response ◽  
Mobile Phase Flow Rate ◽  
Pharmaceutical Dosage Form ◽  
Rizatriptan Benzoate ◽  
Rp Hplc ◽  
Bulk Drug

A simple validated RP HPLC method for the estimation of rizatriptan benzoate in pharmaceutical dosage form and bulk was developed for routine analysis. This method was developed by selecting Agilent TC C18 (250 x 4.6 mm, 5 μ) column as stationary phase and acrylonibrile:water (45:55), pH adjusted to 3, as mobile phase. Flow rate of mobile phase was maintained at 4: 1 mL/min at ambient temperature throughout the experiment. Quantification was achieved with ultraviolet (DAD) detection at 220 nm. The retention time obtained for rizatriptan was 2.8 min. The detector response was linear in the concentration range of 2-25μg/mL. This method was validated and shown to be specific, sensitive, precise, linear, accurate, rugged and robust. Hence, this method can be applied for routine quality control of rizatriptan benzoate in dosage forms as well as in bulk drug.

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