Comparative Study of the Proximate, Mineral and Phytochemical Composition of Zingiber officinale (Zingiberaceae) Cultivated in Kano and Kaduna States, Nigeria
Abubakar US, Tajo SM, Joseph M, Yusuf KM, Abdu GT, Jamila GA, Fatima SS, Saidu SR
The comparative study of the proximate, mineral and phytochemical composition of different samples of Zingiber officinale cultivated in Kano and Kaduna States were investigated. The result shows that Kano unpeeled sample had the highest moisture content (4.74 ± 0.3 %), crude lipid content (11.15 ± 0.2 %) and protein content (4.92 ± 0.1 %), while Kano peeled sample had the highest carbohydrate content (79.55 ± 0.3 %). The highest crude fibre content (1.15 ± 0.1 %) was recorded in Kaduna peeled sample. The mineral analysis shows that Kano unpeeled sample had highest magnesium (2030.80 ± 1.78 mg/kg), calcium (7287.86 ± 0.76 mg/kg) iron (39.13 ± 0.05 mg/kg), zinc (4.86 ± 0.02 mg/kg) and phosphorous content (3.68 ± 0.02 mg/kg); while Kaduna unpeeled sample had the highest manganese (45.78 ± 0.06 mg/kg) and potassium (666.50 ± 0.43 mg/kg) content. The highest sodium content (666.50 ± 0.17 mg/kg) was recorded in Kano peeled sample. The phytochemical constituents detected in all the samples include alkaloids, saponins, flavanoids, phenolic compounds, cardiac glycosides and steroids. The present study has shown that there were no significant differences in the proximate and phytochemical composition; however, Kano unpeeled sample contained higher amounts of most of the mineral elements quantified, consequently, the commercial cultivation of Z. officinale should be promoted in Kano State.