第一部分讨论了DL-蛋氨酸及其衍生物的化学合成，包括丙烯醛法、丙二酸酯法，氨基内酯法等，并着重介绍了海因法。
In the first part, chemical synthesis, including by acraldehyde, malonic ester, ami no lactone and others were discussed and synthesis by hydantoin was emphasized.
方法：采用大鼠在体肠循环模型和高效液相色谱法研究白术内酯Ⅰ在大鼠各肠段的吸收特性。
Method: The absorption kinetics was investigated using the method of in situ intestine absorption in rats and the samples were determined by HPLC.
用正交法对微波和超声波辅助提取穿心莲内酯的工艺条件进行优化。
Orthogonal experiments were used to find the optimal extraction process of andrographolide by microwave and ultrasonic assisted extraction.
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