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Journal of Analytical Methods in Chemistry
Volume 2016, Article ID 2890219, 11 pages
Research Article

Employing Solid Phase Microextraction as Extraction Tool for Pesticide Residues in Traditional Medicinal Plants

1Chemistry Department, University of Botswana, Gaborone, Botswana
2Botswana Institute for Technology Research and Innovation, Gaborone, Botswana
3Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA

Received 12 February 2016; Accepted 12 July 2016

Academic Editor: Antonio V. Herrera-Herrera

Copyright © 2016 Thamani T. Gondo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


HS-SPME was optimised using blank plant sample for analysis of organochlorine pesticides (OCPs) of varying polarities in selected medicinal plants obtained from northern part of Botswana, where OCPs such as DDT and endosulfan have been historically applied to control disease carrying vectors (mosquitos and tsetse fly). The optimised SPME parameters were used to isolate analytes from root samples of five medicinal plants obtained from Maun and Kasane, Botswana. The final analytes determination was done with a gas chromatograph equipped with GC-ECD and analyte was confirmed using electron ionisation mass spectrometer (GC-MS). Dieldrin was the only pesticide detected and confirmed with MS in the Terminalia sericea sample obtained from Kasane. The method was validated and the analyte recoveries ranged from to %, with RSDs ranging from 1.19 to 17.97%. The method indicated good linearity () in the range of 2 to 100 ng g−1. The method also proved to be sensitive with low limits of detection (LODs) ranging from to  ng g−1. It can be concluded that SPME was successfully utilized as a sampling and extraction tool for pesticides of diverse polarities in root samples of medicinal plants.