Investigation and estimation of spectrophotometric values specific and molar absorbances for Losartan Potassium and Valsartan.

  • Dobrina Doncheva Tsvetkova
  • Stefka Achkova Ivanova
Keywords: Losartan Potassium, Valsartan, spectrophotometry, specific, molar, absorbance

Abstract

The aim of current investigation was the investigation and estimation of spectrophotometric values specific (A1%1cm) and molar (e) absorbances for angiotensin receptor blockers Losartan Potassium and Valsartan. The following experimental results were obtained: for solutions of referense standards Losartan Potassium (lmax = 208 nm) at А > 0.2 (3.10–7 g/ml ¸ 6.75.10–7 g/ml): A1%1cm: 12113 ¸ 12778; e: 558441 ¸ 589064; for Valsartan in 99.8 % еthanol at lmax = 252 nm for А > 0.2        (6.10–6 g/ml ¸ 1.10–5 g/ml): A1%1cm : 774 ¸ 800; e: 33730 ¸ 34840. For Valsartan in mеthanol at lmax = 250 nm for А > 0.2 (3.5.10–6 g/ml ¸ 1.10–5 g/ml): A1%1cm: 480 ¸ 628; e: 20885 ¸ 27368. Specific (A1%1cm) and molar (e) absorbances for А < 0.2 were:   

       [C] g/ml                         A1%1cm                            e

3.5.10–8 ¸ 1.10–7                 13107 ¸ 16710         604252 ¸ 770348       Losartan Potassium

5.10–7 ¸ 2.10–6                      877 ¸ 880               38221 ¸ 38304           Valsartan (99.8 % еthanol)

1.2.10–6 ¸ 2.5.10–6              574 ¸ 617                24997 ¸ 26875         Valsartan (mеthanol)

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Author Biographies

Dobrina Doncheva Tsvetkova

Medical University-Sofia, Faculty of Pharmacy, Department of Pharmaceutical Chemistry, 2 Dunav Str., Sofia 1000, BULGARIA

Stefka Achkova Ivanova

Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Medical University-Sofia 

2 Dunav Str., Sofia 1000, Bulgaria

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Published
2018-09-30
How to Cite
Tsvetkova, D. D., & Ivanova, S. A. (2018). Investigation and estimation of spectrophotometric values specific and molar absorbances for Losartan Potassium and Valsartan. IJRDO-Journal of Applied Science, 4(9), 13-20. https://doi.org/10.53555/as.v4i9.2422