Today DNJ has been found in many kinds of plants and microbes especially in mulberry leaves.
目前已发现多种植物和微生物具有合成和积累dnj的特性，其中以桑叶中的含量最高。
The content of DNJ was calculated by standard curve method, which can simplify repetitive operation and avoid systematic errors.
本试验采用标准曲线法计算DNJ含量，该法具有简化重复操作，避免系统误差等优点。
There was rich DNJ in Ramulus mori, and the DNJ contents were significantly different according to the mulberry varieties, stage and ages.
桑枝富含DNJ，其含量在桑品种、生长季节和老嫩程度间存在显著差异。
Finally, the best conditions to determine DNJ by capillary column gas chromatography was confirmed: samples was treated by ultrasonic wave for 30 minutes with Pyridine as extraction reagent.
最终确定用吡啶作为提取试剂在超声波条件下处理30分钟为毛细管气相色谱法测定dnj的最佳提取条件。
Finally, the best conditions to determine DNJ by capillary column gas chromatography was confirmed: samples was treated by ultrasonic wave for 30 minutes with Pyridine as extraction reagent.
最终确定用吡啶作为提取试剂在超声波条件下处理30分钟为毛细管气相色谱法测定dnj的最佳提取条件。
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