The labeling yield is about 45% using sodium ascorbate as reductant;
采用抗坏血酸钠为还原剂时，标记率为45％；
The further improvement of labeling yield and purity of the label should be made.
进一步的工作是要提高标记率和标记物的纯度。
The simulative labeling yield was tested by UV-spectrophotometer and calculated as 80.4%.
采用紫外分光光度计测试吸光度并计算出模拟标记率达80.4%。
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