Evaluation of the pH, titratable acidity and viscosity of various brands of syrups sampled from various pharmacy stores in Benin.

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Uyi M. Ogbeide
Emeka A. Okorie
Henry A. Okeri

Abstract

Background: For so long now, medicated syrups have been used in paediatric practice for the treatment of disease conditions, as palliatives and even as food supplements / haematinics. Pharmaceutical firms sweeten liquid preparations with sucrose to aid compliance, and this in turn increases their viscosity. Some of the constituents of these syrups are acidic and are capable causing erosion of the dentiture.


Objectives: This in vitro study aims to evaluate the endogenous pH, titratable acidity and viscosity of different syrups sampled from different pharmacy stores in Benin City.


Methods: Sixteen (16) commonly used syrups were evaluated. The pH of each syrup was determined using a digital pH meter. The titratable acidity was assessed by titrating 0.1 N sodium hydroxide solution against 30 ml of each syrup until a pH of 8.2 was reached. The viscosity of the syrups was determined using a suspended level viscometer.


Results: The pH of the syrup brands ranged from 3.25 to 6.18. All the syrups had an acidic pH and 82% of the samples showed pH below the critical value of 5.5 which is capable of causing enamel dissolution. The titratable acidity of the syrups ranged from 0.93-7.50 g/100 ml while the kinematic viscosity of the syrups ranged from 6.51- 2 -1 75.96 mm S .


Conclusion: The outcome of this study confirms that all syrups investigated had high values of pH, titratable acidity and viscosity.

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How to Cite
Ogbeide, U. M., Okorie, E. A., & Okeri, H. A. (2023). Evaluation of the pH, titratable acidity and viscosity of various brands of syrups sampled from various pharmacy stores in Benin. West African Journal of Pharmacy, 31(1), 155 – 162. https://doi.org/10.60787/wapcp-31-1-213
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