盾叶薯蓣根状茎中钙、锌及六磷酸肌醇含量的动态变化

Dynamic Changes of the Contents of Calcium,Zinc and Phytate in the Rhizomes of Dioscorea zingiberensis C.H.Wright

钙、锌和六磷酸肌醇的含量是反映农作物营养价值的重要指标。以两年生盾叶薯蓣(Dioscorea zingiberensis C.H.Wright)植株根状茎为材料,对其在不同生长时期的钙、锌以及六磷酸肌醇含量进行测定并对其相互关系进行了分析。结果表明:盾叶薯蓣根状茎中钙的平均含量为424.24 mg/100 g干重;锌的平均含量为12.73 mg/100 g干重;六磷酸肌醇的平均含量为4460.19 mg/100 g干重;六磷酸肌醇对钙和锌的吸收有影响。盾叶薯蓣根状茎的淀粉平均含量为32.84 g/100 g干重;最大还原力为0.931,最大自由基清除效应为22.83%,表明其有一定的抗氧化能力。这些结果表明盾叶薯蓣根状茎具有一定的营养价值和保健价值。

Contents of calcium, zinc and phytate were important indexes that reflects the nutrition value of the corps. In this study, rhizomes of biennial plants of Dioscorea zingiberensis C. H. Wright were used as study material, contents of calcium, zinc and phytate were determined and their relationships were ana- lyzed in different growing periods. The results indicated the following averages of contents： Calcium - 424.24mg/100 g; Zinc - 12.73mg/100 g dry weigt;and Phytate -4460.19mg/100 g dry weight in the rhizomes of D. zingiberensis. The bioavailability of calcium and zinc were low due to the phytate in the rhizomes. The average content of starch in rhizomes was 32. 84 g/100 g dry weight ; the strongest reducing power was 0.931 ;the highest level of free radical scavenging effect was 22. 83 % ;those showed a certain degree of antioxidant capacity. All these results revealed that the rhizomes of D. zingiberensis were nutritious and healthy to human beings.