<正>以天然产物颗粒紫胶为原料，经无水亚硫酸钠保护下皂化、盐析等过程，提取用于香料工业的紫胶桐酸。提取过程中不加入任何有机溶剂，不必进行精制作业，可直接获得质量分数大于98%的紫胶桐酸产品。研究了皂化时间、皂化温度、盐析时间以及亚硫酸钠对紫胶桐酸收率的影响，获得提取过程的优化工艺条件：Na（）H质量分数25%，料液比l：6，皂化时间96h，无水Na2SO3为紫胺质量的lO%，盐析时间18h。并利用有机元素分析仪、红外光谱、显微溶点测定仪等手段表征了提取的紫胶桐酸结构。结果表明：在优化工艺条件下，紫胶桐酸质量分数可达98.85%～99.43%。收率可达24.64%～25.16%。

Volatiles compounds from twigs of Pinus massoniana were extracted by solid phase microextraction and steam distillation. Their constituents were analyzed by gas chromatography-mass spectrometry and compared. Twenty-six compounds were identified in the solid phase microextraction extracts, the main components were α-pinene, β-pinene, sabinene, isolongifolene and trans-caryophyllene. Thirty-nine compounds were identified in the steam distillation extracts, the major components were α-pinene, β-pinene, β-phellandrene, trans-caryophyllene, isolongifolene and camphene. The result showed that chemical compositions and relative contents of common compositions were different by means of different extracted methods.