A comparative study of the derivatisation of salicylic acid and acetylsalicylic acid with BSTFA, MSTFA and methyl iodide in presence of potassium carbonate prior to GLC determination

1975 ◽  
Vol 8 (1) ◽  
pp. 33-34 ◽  
Author(s):  
S. Laik Ali
Keyword(s):  
Salicylic Acid ◽  
Comparative Study ◽  
Acetylsalicylic Acid ◽  
Methyl Iodide ◽  
Potassium Carbonate

scholarly journals Application of Liquid Chromatography to the Simultaneous Determination of Acetylsalicylic Acid, Caffeine, Codeine, Paracetamol, Pyridoxine, and Thiamine in Pharmaceutical Preparations

2001 ◽  
Vol 84 (3) ◽  
pp. 676-683 ◽  
Author(s):  
Natividad Ramos-Martos ◽  
Francisco Aguirre-Gómez ◽  
Antonio Molina-Díaz ◽  
Luis F Capitán-Vallvey
Keyword(s):  
Salicylic Acid ◽  
Acetylsalicylic Acid ◽  
Simultaneous Determination ◽  
Pharmaceutical Preparations ◽  
Reversed Phase ◽  
Liquid Chromatographic Method ◽  
Relative Standard ◽  
Phase Liquid ◽  
Liquid Chromatographic

Abstract This paper describes a rapid reversed-phase liquid chromatographic method, with UV detection, for the simultaneous determination of acetylsalicylic acid, caffeine, codeine, paracetamol, pyridoxine, and thiamine in pharmaceutical preparations. A reversed-phase C18 Nucleosil column is used. The mobile phase consists of 2 successive eluants: water (5 min) and acetonitrile–water (75 + 25, v/v; 9 min), both adjusted to pH 2.1 with phosphoric acid. Before determination acetylsalicylic acid is completely converted to salicylic acid by alkaline hydrolysis. Salicylic acid, caffeine, paracetamol, pyridoxine, and thiamine are all detected at 285 nm, whereas codeine is detected at 240 nm. Calibration curves were linear for salicylic acid, caffeine, paracetamol, and pyridoxine in the range of 50–500 mg/L, and for codeine and thiamine in the range of 50–1000 mg/L. The method was applied to the analysis of 13 fortified commercial pharmaceutical preparations. Recoveries ranged from 92.6 to 105.5%, with relative standard deviations of 1.1–5.8%.

scholarly journals Efficacy and Safety of 25% Trichloroacetic Acid Peel Versus 30% Salicylic Acid Peel in Mild-to-Moderate Acne Vulgaris: A Comparative Study

2021 ◽  
pp. 2021063
Author(s):  
Surabhi Dayal ◽  
Satbir Singh ◽  
Priyadarshini Sahu
Keyword(s):  
Salicylic Acid ◽  
Adverse Effects ◽  
Comparative Study ◽  
Clinical Efficacy ◽  
Trichloroacetic Acid ◽  
Acne Vulgaris ◽  
Efficacy And Safety ◽  
Inflammatory Lesions ◽  
Treatment Groups ◽  
Proven Efficacy

Background: Both salicylic acid (SA) and trichloroacetic acid (TCA) have proven efficacy with goodsafety profiles in the treatment of acne vulgaris. Objectives: This study compared the clinical efficacy and safety of 25% TCA and 30% SA peels in thetreatment of mild and moderate acne vulgaris. Methods: Patients with mild or moderate acne vulgaris were randomized into 2 groups of 25 personseach, and treated with either the TCA peel or the SA peel at 2-week intervals for 12 weeks. Evaluationof active acne was done by individual lesion counts (comedones, papules and pustules) and calculationof the Michaelsson acne score (MAS). Results: Both peels led to significant decrease in individual lesion counts and MAS compared to baselinevalues, without significant differences between the treatment groups. Thus, the peels had equivalentefficacy against acne vulgaris. The TCA peel was better in treating non-inflammatory lesions,while the SA peel was better for inflammatory lesions, but the differences were not significant. Noserious adverse effects were recorded, but more patients in the TCA peel group experienced burningand stinging sensations. Conclusion: The efficacy of 25% TCA is comparable to that of 30% SA in mild-to-moderate acnevulgaris, but safety and tolerability were better with the SA peel than TCA peel.

scholarly journals Automatic continuous on-line monitoring of salicylic acid and acetylsalicylic acid in pharmaceuticals

1990 ◽  
Vol 12 (6) ◽  
pp. 263-266 ◽  
Author(s):  
J. M. López Fernández ◽  
M. D. Luque de Castro ◽  
M. Valcárcel
Keyword(s):  
Salicylic Acid ◽  
Acetylsalicylic Acid ◽  
Simultaneous Determination ◽  
Pharmaceutical Preparation ◽  
Pharmaceutical Preparations ◽  
Sampling Frequency ◽  
The Other ◽  
Dissolution Test ◽  
On Line

An asymmetrical FIA merging-zones manifold based on the dual injection of two sample microvolumes was developed for the simultaneous determination of salicylic acid and acetylsalicylic acid in pharmaceutical preparations at a sampling frequency of 30/h. The complex formed between the Fe(III) reagent continuously introduced in the system and salicylic acid was monitored photometrically at 520 nm. One of the sample plugs was prehydrolysed on injection into an NaOH stream and was circulated through a longer channel than the other plug. This yielded two FIA peaks corresponding to salicylic acid and the overall content, respectively. The proposed manifold was successfully used to control the dissolution test of a pharmaceutical preparation.

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