Browsing by Author "Abdulra’uf, L. B., Adeyemo, F. A. and Atanda, F. B., Lawal, A. R."

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    Detection of pendimethalin and cypermetrin residues in locally produced tomato using QuEChERS-HPLC analysis
    (Nigerian Journal of Basic and Applied Sciences, Faculty of Science, Usmanu Danfodio University, Sokoto, Nigeria, 2019) Abdulra’uf, L. B., Adeyemo, F. A. and Atanda, F. B., Lawal, A. R.
    Carpolobia lutea is a medicinal plant commonly utilized in Nigeria to boost libido. The ethnomedicinal importance of any plant lies in some secondary metabolites. Hence, the present study was carried out to investigate the proximate and phytochemical composition of roots and leaves of this plant using standard methods. The proximate composition of leaves and roots showed moisture, ash, fibre, protein, fat and carbohydrate contents with values that ranged between 8.84-9.55, 3.48-3.65, 1.10-1.06, 6.64-8.39, 1.80-1.80 and 76.16-77.47% respectively. The leaves contained higher amount of ash, crude protein and fat than the roots. The results of ethanolic extracts showed the presence of alkaloids, anthraquinones, steroids, saponins, tannins, phenols, terpenoids, anthocyanin, carotenoids and flavonoids in both the leaves and roots. These phytochemicals were found to be significantly higher in roots except for anthraquinones, flavonoids and steroids which were significantly higher in the leaves. Among the phytochemicals, alkaloids were found to be highest in concentration followed in decreasing order by saponins, steroids, tannins, flavonoids, anthraquinones, anthocyanin, terpenoids, phenols and carotenoids. The results indicated that, C. lutea leaf and root have high nutritive and medicinal values and this could be explored for pharmaceutical purpose.
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    Detection of Pendimethalin and Cypermetrin Residues in Locally Produced Tomato using QuEChERS-HPLC Analysis
    (Nigerian Journal of Basic and Applied Sciences,Faculty of Science, Usmanu Danfodio University, Sokoto, Nigeria, 2019) Abdulra’uf, L. B., Adeyemo, F. A. and Atanda, F. B., Lawal, A. R.
    This study investigated the levels of pendimethalin and cypermetrin residues in tomato sold in Malete market, Moro Local Government Area of Kwara State. Tomatoes were randomly collected from five different vendors in Malete market and analysis was performed using the QuEChERS (Quick, Easy Cheap, Effective, Rugged and Safe) method followed by chromatographic analysis using high performance liquid chromatography (HPLC) coupled to ultra-violet (UV) detector. Method validation of the study showed a linearity of the analytes which ranges from 5 – 500 μg/kg, with correlation coefficients greater than 0.999. The average recovery ranges from 75.6 to 111 % with relative standard deviation (RSD) from 2.74 to 9.03 %. The results indicated the presence of cypermethrin in analyzed samples at concentrations lower than the permissible maximum residue levels