Evaluation of turbidimetric and nephelometric techniques for analytical determination of n-acetylcysteine and thiamine in pharmaceutical formulations employing a lab-made portable microcontrolled turbidimeter and nephelometer

Journal of the Brazilian Chemical Society

Centro de Ciências Exatas e de Tecnologia, São Carlos, Brazil¹  Guerreiro, Thiago B.¹  Suarez, Willian T.¹  Centro de Ciências Exatas e Tecnológicas, Viçosa, Brazil¹  Santos, Vagner B. dos¹  Fatibello-Filho, Orlando¹  Faria, Ronaldo C.¹ 

关键词: turbidimetry;    nephelometry;    N-acetylcysteine;    thiamine;    microcontrolled photometric detector;   

DOI  :  10.1590/S0103-50532011001000019

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

Sequential turbidimetric and nephelometric (STN) analysis for two distinct analytical applications employing a portable microcontrolled turbidimeter and nephelometer (PMTN) is proposed. The PMTN is based on light emitting diodes, photodiodes and, a microcontroller as a central processing unit with a LCD (liquid crystal display) as displayer. The STN methods were applied to determine N-acetylcysteine and two analytical curves in the concentration ranges from 8.0 × 10-5 to 5.0 × 10-3 mol L-1 and from 5.0 × 10-5 to 1.2 × 10-3 mol L-1 were obtained to nephelometry and turbidimetry, respectively. Limits of detection (LOD) of 2.6 × 10-6 and 7.5 × 10-6 mol L-1 were acquired for these procedures. The STN analyses were also performed to determinate thiamine and two analytical curves in the concentration ranges from 5.0 × 10-6 to 2.5 × 10-4 mol L-1 and from 5.0 × 10-6 to 1.0 × 10-4 mol L-1 with LOD of 5.91 × 10-8 and 3.11 × 10-8 mol L-1 were acquired for nephelometry and turbidimetry, respectively.

【 授权许可】

Unknown