Objective: To study and compare the fat-soluble components from the roots

stems

leaves and fruits of Sedum aizoon. Method: The fat-soluble components from different parts of S.aizoon were extracted by soxlet extraction.The fat-soluble components were esterified by using potassium hydroxide-methanol direct esterification method and then analyzed by gas chromatography-mass spectrometry (GC-MS).Carrier gas was high-purity helium; sample injection temperature was 250℃; velocity of flow was 1.24 mL · min-1; ionization mode was EI ion source

with ion source temperature of 200℃

interface temperature of 250℃

solvent delay of 3.5 min

m/z 40-600. Result: The 26

37

37 and 20 kinds of fat-soluble components were identified from roots

stems

leaves and fruits respectively.12 kinds of them were contained in all of the four parts

while 6

6

9 and 2 kinds were only present in roots

stems

leaves or fruits respectively.The main components of fat-soluble components were unsaturated fatty acids

which were mainly composed of linolenic acid and linoleic acid.The contents of unsaturated fatty acids were 42.59%

52.57%

37.04% and 80.06% respectively in roots

stems

leaves and fruits.The ratios of unsaturated fatty acids to saturated fatty acids in the different parts were 1.17:1

1.38:1

0.85:1 and 4.56:1.The four parts had similar fatty acid compositions

but there were some differences in the composition ratios. Conclusion: The fat-soluble components of S.aizoon were extracted

identified and compared for the first time.This research could establish foundation for further research and development of S.aizoon.