目的 系统探究杂交构树根、茎、叶总黄酮醇溶液的理化性质，分析不同部位中总黄酮的差异性。 方法 选取杂交构树中科1号101的根、茎、叶中提取的总黄酮醇溶液为原料，先通过特定仪器设备测定其表观特征、pH值、电导率值和抗氧化能力，再用电子扫描显微镜观察其特定处理后的微观特征。 结果 等体积杂交构树根、茎、叶总黄酮醇溶液颜色各异，均带易挥发乙/甲醇味；pH值均在6.3~7.0，且茎＞根＞叶，但差异不显著；电导率值无显著差异，均在966~1 000 μS/cm；等浓度条件下总体上对DPPH、ABTS自由基的清除率分别为：茎部≥根部＞叶部以及根部＞茎部≥叶部；等浓度特殊干燥处理后的固体形貌存在极为明显的差异。 结论 杂交构树根、茎、叶总黄酮醇溶液在颜色、pH、电导率上差异不显著，但对自由基的清除率及干燥后固体形貌差异明显。杂交构树根部和茎部的总黄酮含量较高，具有开发成为抗氧化饲料添加剂的潜力。

Objectives The physical and chemical properties of total flavonol solution in roots, stems and leaves of hybrid Broussonetia papyrifera was studied. The differences of total flavonoids in different parts were analyzed. Methods The total flavonol solution extracted from the roots, stems and leaves of hybrid Broussonetia papyrifera Zhongke No.1-101 was used to determine the apparent characteristics, pH, electrical conductivity and antioxidant capacity with specific instruments and equipment, and then to observe the microscopic characteristics with electron scanning microscope. Results The total flavonol solution with equal volume of roots, stems, and leaves in hybrid Broussonetia papyrifera varied in color and carried a volatile taste of ethyl/methanol. The pH was between 6.3 and 7.0, with stems>roots>leaves, but the difference was not significant. There was no significant difference in electrical conductivity, all ranging from 966 μS/cm to 1 000 μS/cm. The overall scavenging rate of DPPH and ABTS free radicals under the same condition concentration was as follows: stem≥root>leaf, and root>stem≥leaf. There were significant differences in the morphology of solid after special drying treatment at the same concentration. Conclusions The total flavonol solution in the roots, stems, and leaves of hybrid Broussonetia papyrifera had no significant difference in color, pH, and electrical conductivity, but there were significant differences in the scavenging rate of free radicals and the morphology of solid after drying. The content of total flavonoid in the roots and stems of hybrid Broussonetia papyrifera was relatively high, with the potential to be developed into antioxidant additives for feed.