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[Objective] To determine contents of nutritional compositions in the purple cultivar from Dioscovea alata Linn.originated from different habitats,and to compare with those in Dioscorea opposite Thumb.,so as to provide basis for the further development and application of the purple cultivar from Dioscovea alata Linn..[Method] The contents of nutrients in the purple cultivar from Dioscovea alata Linn.from different habitats like Zhejiang,Jiangxi and the farmstead in west suburb of Beijing were determined by conventional methods,and were comparatively analyzed with those of two varieties of Dioscorea opposite Thumb.from Henan Province(D.opposite Thumb.1 and D.opposite Thumb.2).[Result] D.opposite Thumb.2 was rich in crude protein,crude fiber,Fe and K;while D.opposite Thumb.1 was rich in fat,crude fiber,Cu,Ca,Mg and Se;the purple cultivar from D.alata L.from Zhejiang Province was abundant in Cu,Ca,Mn,K,glucose and sucrose;the purple D.alata L.in Beijing contained abundant soluble sugar,soluble acid,K and Se;that in Jiangxi was rich in Vc,P and Se.[Conclusion] The Chinese yam from different areas shows their own advantages in the nutrient content.
[Objective] To determine contents of nutritional compositions in the purple cultivar from Dioscovea alata Linn.originated from different habitats, and to compare with those in Dioscorea opposite Thumb., So as to provide basis for the further development and application of the purple cultivar from Dioscovea alata Linn .. [Method] The contents of nutrients in the purple cultivar from Dioscovea alata Linn.from different habitats like Zhejiang, Jiangxi and the farmstead in west suburb of Beijing were determined by conventional methods, and were comparatively analyzed with those of two varieties of Dioscorea opposite Thumb.from Henan Province (D.opposite Thumb.1 and D.opposite Thumb.2). [Result] D.opposite Thumb.2 was rich in crude protein, crude fiber, Fe and K; while D. Opposite Thumb.1 was rich in fat, crude fiber, Cu, Ca, Mg and Se; the purple cultivar from D.alata L. from Zhejiang Province was abundant in Cu, Ca, Mn, K, glucose and sucrose; the purple D .alata L.in Beijing contained abundant soluble sugar, sol uble acid, K and Se; that in Jiangxi was rich in Vc, P and Se. [Conclusion] The Chinese yam from different areas shows their own advantages in the nutrient content.