10份不同地理来源桑种质资源冬桑叶中的营养与活性成分含量测定

Contents of Nutritional and Active Substances in Frostbitten Leaves of 10 Mulberry Germplasm Resources of Different Geological Origins

采用凯氏定氮法、索氏提取法等对来自亚洲、大洋洲部分国家和地区的10份桑种质资源冬桑叶中的营养及活性物质含量进行测定分析，评估不同地理及生态环境来源桑种质资源桑叶的饲料与药食用途开发利用价值。10份桑种质资源冬桑叶干物质中的蛋白质质量比在54．30—77．40mg／g之间，脂肪质量比在17．20～80．30mg／g之间，多糖质量比在5．75～25．00mg／g之间，黄酮质量比在3．03—7．60mg／g之间，多酚质量比在1．38—4．72mg／g之间，γ-氨基丁酸质量比在0．84～1．02mg／g之间。供试材料中的营养成分含量与活性成分含量间不具有相关性。西庆8号、永胜1号和柬埔寨桑3份来自亚洲的桑种质资源的冬桑叶中的蛋白质含量较高，质量比在73．90～77．40mg／g之间，具有较高的饲料利用价值；来自大洋洲的桑种质资源澳大利亚桑冬桑叶中的多糖、黄酮和多酚含量最高，质量比分别为25．00、7．60、4．72mg／g，具有较高的药食用途开发利用价值。

In order to evaluate the potential of utilizing mulberry germplasm resources of different geological and ecologi- cal origins for development of forage, medical and food products, the contents of nutritional and active substances in frostbitten leaves of 10 mulberry germplasm resources from various Asian and Oceanian countries were determined and analyzed by Kjeldahl method, Soxhlet extraction method, etc. The results showed that the mass ratio of protein in dry matter of the 10 samples was between 54.30 and 77.40 mg/g, that of fat was between 17.20 and 80.30 mg/g, that of polysaccharide was between 5. 75 and 25. 00 mag/g, that of fiavonoid was between 3. 03 to 7. 60 mg/g, that of polyphe-nol was between 1.38 and 4.72 mg/g, and that of γ- aminobutyric acid （GABA） was between 0.84 and 1.02 mg/g. There was no correlation between the contents of nutritional components and active substances in the tested materials. Three mulberry resources of Asian origin, namely Xiqing 8, Yongsheng 1 and Cambodian mulberry, had higher protein content （mass ratio between 73. g0 and 77. 40 mg/g）, being favorable forforage development. The mulberry germplasm resource Australia mulberry from Oceaniania had the highest polysaccha- ride, flavonoid and polyphenol contents （mass ratio at 25. 00 mg/g, 7.60 mg/g and 4. 72 mg/g respectively）, being promising for medical and food use.