VALIDATED NOVEL SPECTROSCOPIC METHOD FOR ESTIMATION OF TRIAMCINOLONE ACETONIDE IN NASAL SPRAY

A simple, sensitive, accurate, precise and cost-effective pH independent spectrophotometric method has been developed for the estimation of triamcinolone acetonide in nasal sprays. Estimation was carried out at the isosbestic point of drug solutions, Isosbestic point was measured by scanning equimolar solution of triamcinolone acetonide separately in phosphate buffer pH 3.0, phosphate buffer pH 7.0 and phosphate buffer pH 10.0 at a concentration of 10 µg mL-1. They were scanned in the wavelength range of 200-400 nm. The isosbestic point was found to be 230.0 nm in acidic, basic and neutral condition; hence pH independent wavelength 230 nm was used for estimation of triamcinolone acetonide. The method observed linear response in the concentration range of 3-18 µg mL-1 at 230 nm. Developed method has been validated in accordance with ICH guideline Q2 R1 for several parameters like linearity, precision, accuracy, limit of detection and limit of quantification. The developed and validated analytical method was successfully applied to the estimation of triamcinolone acetonide in marketed nasal spray formulations.

Simultaneous estimation of pioglitazone, glimepiride & metformin hydrochloride in bulk & tablet dosage form by UV, RP-HPLC method

A stability-indicating UV spectroscopic and high-performance liquid chromatography (RP-HPLC) method is developed for the quantification ofPioglitazone, Glimepiride & Metformin Hydrochloride drug substances. UV spectroscopic method was developed and validated, the wavelength selected for simultaneous estimation were 226nm for pioglitazone, 229nm for glimepiride and 232nm for metformin hydrochloride. The isosbestic point found for the analysis was 229nm. Selected mobile phase was a combination of methanol and water with a ratio of 70% Methanol and 30 % HPLC water with the flow rate of 0.85ml/min. The analyte was analysed on the C18 HPLC column having the pore size of 5 microns at room temperature. The method is validated according to ICH guidelines, the retention time of about 4.0min for metformin, 5.5min for Pioglitazone and 6.8min for Glimepiride was observed. The linearity range with regression co-efficient for Pioglitazone, Glimepiride & Metformin Hydrochloride is 3-15 μg/mL,0.4-1.2 μg/mL and 100-500 μg/mL and 0.9998, 0.9991, 0.9991 respectively.

ABSORPTION AND FLUORESCENCE SPECTRA OF THE COMPLEXES OF METHYLENE BLUE AND ACRIDINE ORANGE WITH POLY(rA)-POLY(rU)

The interaction of methylene blue (MB) and acridine orange (AO) with poly(rA)-poly(rU) was studied using absorption and fluorescence spectroscopy methods. The absorption and fluorescence spectra of complexes of these ligands with a polynucleotide were obtained, similar to those of complexes of these ligands with double-stranded (ds-) DNA. It was revealed that the isosbestic point in the spectra of the AO-poly(rA)-poly(rU) and MB-poly(rA)-poly(rU) complexes is not formed, although the binding of AO and MB with ds-RNA by intercalation mode is not excluded.

Identification of C-H Bond Vibration Mode Using Absorption Spectroscopy By A Simple Optically Configured Setup

An optical system model for the identification of Carbon-Hydrogen stretching using spectroscopy is demonstrated and applied to the experiment setup. The optical simulation is achieved using simulation software and performed in a two-mirror system. The optical setup covers a wavelength range of 600 nm to 1200 nm which is a new study based on carbon-hydrogen stretch and test with samples from the alkene group. Significant results of the Carbon-Hydrogen stretch from the alkene group at 1149 nm are detected in Dichloromethane and ethanol. This observation is recorded in real-time and applied in a fast diagnostic system. The isosbestic point of water is measured at 970 nm and useful for our system spectral calibration. The result also shows the ability to quantify the chemical bond of a sample based on two peaks of absorption due to the C-H stretching. This gives a better opportunity for Chemometrics to perform accurately.

Vacuum-Ultraviolet Absorption Spectra of Icy C2H4 at 13–60 K

The thermal variation of absorption spectra of icy ethene in wavelength range 105–220 nm was measured from 13 to 100 K using a synchrotron as light source. Sublimation of icy ethene began above 62 K, resulting in decreasing absorption. The absorption of icy ethene increased at wavelengths less than about 150 nm with increasing temperature from 13 to 60 K, but decreased beyond above 150 nm. According to detailed examination, the absorption spectra of icy ethene intersected at isosbestic point 147.0 nm from 13 to 17 K, whereas those varied absorption profiles crossed at another point, 150.6 nm, from 23 to 60 K. These results indicate that ethene ices might exhibit three structures within temperature range 13–60 K. This work enhances our understanding of the spectra of icy ethene at low temperatures and our knowledge of its astrochemistry and astrophysics in cold astro-environments.

Simultaneous Estimation of Chlorpheniramine Maleate and Glyceryl Guaiacolate in Pure and Capsule Dosage form by using different Spectrophotometric Methods

Chlorpheniramine Maleate (CPM) and Glyceryl Guaiacolate (GUA) are the β‐lactum antibiotic drug. Sensitive, precise, accurate and simple, UV spectrophotometric methods have been developed for the simultaneous estimation of Chlorpheniramine Maleate (CPM) and Glyceryl Guaiacolate (GUA) in dosage form. Two spectrophotometric methods (simultaneoue equations and Q‐Absorbance ratio) were applied for the determination of the drugs as mixture. The maximum absorbance of drug in solvent mixture composed of water – acetontrile – methanol in a ratio of (80% H2O – 10% ACN – 10% MOH) was found to be at (261.4 nm and 273 nm) for CPM, GUA respectively, and the Q – isosbestic point was found at 270.4 nm. These wavelengths were selected for the analysis of drugs as mixtures standard and in the manufactured samples using the two developed methods. The methods were linear in the range of (1- 100) μg/mL for (CPM, GUA), with an R2 of (0.9996) for CPM and GUA respectively in the mixture. Recovery means were found to be (99.79 % - 100.30 %) for the standard drugs CPM and GUA respectively and in formulating drugs was found to be (99.71 – 100.41 %). LOD and LOQ were established and found to be (0.1 and 0.33) for CPM and GUA respectively. The method was applied for the estimation of the active gradient of the drugs in different samples of manufactured dosage. The accuracy of method was validated by mean percentage recovery, which was found to be in the acceptable range.

The Impacts of Various Media on the Electronic Spectrum of Aniline Violet

The solvent impact can be decided by Solvent polarity scales, a solvatochromic parameter that has a distinctive position of UV-Visible absorption band within the extend between 250 and 700 nm. The spectral characteristics of Aniline Violet in several solvents at room temperature were analyzed which is that the point of considering the impact of solvents on the absorption spectra of this cationic dye in organic solvent of distinctive characters. The solvent impacts on the wavenumber of the absorption band maxima (max) were talked about utilizing the taking after solvent parameters, refractive index, n, relative permittivity, ε and therefore the empirical solvent polarity ET (30), (*,  and ) and (SA, SB, SP and SPd). The solute–solvent interactions were decided on the premise of multilinear solvation energy relationships concept. The fitting coefficients gotten from this analysis allowed us to estimate the contribution of each type of interactions to the total spectral shifts in solution. The set up dependences between max and the solvent parameters emphasize that the visible band of the examined molecule is influenced by both non-specific and specific solute–solvent interactions. The results appeared the solvent polarizability has major impact on the spectral shift instead of hydrogen bonding accepting ability. Catalan strategy show higher acceptable correlation than Kamlet-Taft methodology and Katritzky methodology. The dissociation constant pKa and the isosbestic point of the explored compound were shown the presence of the individual predominate ionic species was assigned by constructing distribution charts at diverse pH ranges. The results showed that the relative permittivity constant, ε, is important factor affecting on the magnitude of the dissociation constant beside the hydrogen bonding of the solvent.

SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATION OF DAPAGLIFLOZIN AND SAXAGLIPTIN IN FIXED DOSE COMBINATION (FDC) BY Q-ABSORBANCE RATIO METHOD

A simple Q-absorbance ratio method have been developed for the determination of dapagliflozin (DAPA) and saxagliptin (SAXA) in fixed dose combination (FDC) using UV-Visible spectrophotometer. In this method, the UV spectra of DAPA and SAXA were overlaid to obtain wavelength at isosbestic point (λiso) of 217.6 nm and at absorption maximum (λmax) of DAPA at 224.2 nm, which are involved in the formation of Q-absorbance equation. Validation of method was done according to ICH guidelines. DAPA and SAXA obeyed Beers law in the concentration range of 2-25 µg/mL and 5-25 µg/mL, respectively. Good accuracy of method was determined by recovery studies and found to be in the range of 103.1-104.6% for DAPA and 97.7-102.4% for SAXA. This method has shown good precision (%RSD < 2.0). Statistical analysis like one-way ANOVA and student t-test were conducted and the reported method was accurate. This method was found to be simple, cheap, eco-friendly accurate and precise and can be used for routine analysis of DAPA and SAXA in FDC for testing regularly in manufacturing units.

Bioanalytical Method Development and Validation for the Simultaneous Determination of Vildagliptin and Telmisartan in Rabbit Plasma Using RP-HPLC

A simple, reproducible bioanalytical method of liquid chromatography and PDA detector was developed and validated for the simultaneous Determination of Vildagliptin and Telmisartan in Rabbit Plasma using liquid-liquid extraction technique. K2 EDTA was used as anti-coagulant. Analytes were extracted by Methyl-tert-Butyl Ether (MTBE) and subsequent separation on a Kromasil C18 column (5 µ, 100 × 4.6 mm) using Acetonitrile : Methanol 75:25 v/v as mobile phase at a flow rate of 1 mL/min and (40±1)°C column oven temperature. Analytes were monitored with PDA detector at an isosbestic point of 225 nm for both Vildagliptin and Telmisartan. Retention times of Vildagliptin and Telmisartan were found to be at 2.545 mins and 6.633 mins respectively. The method was validated over a linear (r2 = 0.9979) concentration range of 24.979 - 5003.808 µg/ml for Vildagliptin and 1.011- 202.559 µg/ml for Telmisartan. The inter-day and intra-day precisions were found to be less than 15% and the accuracy was all within ±15% (at LLOQ ±20%). The developed HPLC-PDA method was fully validated for all the other parameters as per FDA guidelines like selectivity, matrix effect, recovery and stability as well. Due to the high degree of sensitivity, very less time consuming, easy extraction procedure and low requirement of sample volume, the method will be applicable for therapeutic drug monitoring.