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Tropical Journal of Pharmaceutical Research
Pharmacotherapy Group, Faculty of Pharmacy, University of Benin, Benin City, Nigeria
ISSN: 1596-5996
EISSN: 1596-9827
Vol. 14, No. 3, 2015, pp. 379-384
Bioline Code: pr15050
Full paper language: English
Document type: Research Article
Document available free of charge

Tropical Journal of Pharmaceutical Research, Vol. 14, No. 3, 2015, pp. 379-384

 en Comparative Adsorption of Spiramycin on Veegum®, Activated Charcoal and Garcinia kola check for this species in other resources Heckel (Guttiferea) Seed
Okonkwo, Chukwudi T.; Nzekwe, Ifeanyi T.; Okorie, Ogbonna; Okonkwo, Tochukwu J.; Agubata, Chukwuma O.; Mbah, Chukwuemeka C. & Esimone, Charles O.


Purpose: To investigate the adsorptive interaction of Garcinia kola check for this species in other resources with spiramycin, since the kola is widely chewed as a tonic and spiramycin attains high concentrations in saliva.
Methods: Spiramycin solutions of different concentration were added to a fixed mass of Garcinia kola (200 mg), activated charcoal or Veegum®. Shaking was carried out at room temperature after which the dispersion was filtered and the filtrate assayed for residual drug concentration. The process was repeated under different equilibrium conditions of pH and ionic strength. The adsorption data obtained for the three adsorbents were analyzed using Langmuir and Freundlich’s plots.
Results: At neutral pH, drug adsorprtion by Garcinia kola, activated charcoal and Veegum® were 67, 54 and 71 %, respectively; differences in adsorption was not significant (p = 0.09). However, the other two adsorbents exhibited adverse adsorption characteristics in terms of negative adsorption capacity (- 5.78 and constant (-1141 mol-1L). For each of the adsorbents, pH and ionic strength affected the extent of adsorption, due to their effect on adsorbent surface charge. Correlation with Langmuir and Freundlich relationships were poor, the correlation coefficient for the latter being 0.97, 0.894 and 0.351 for Garcinia kola, Veegum® and activated charcoal, respectively.
Conclusion: The study reveals that Garcinia kola significantly adsorbs spiramycin under alkaline conditions comparable to salivary pH, and therefore should not be taken concurrently with the drug in order to minimize reduction in drug levels.

Garcinia kola; Spiramycin; Adsorption; Antidote; Interaction; Langmuir plot; Freundlich’s plot

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