In order to prove which layer of Cinnamomi cortex had been used in Oriental medicine, the contents of cinnamic acid and cinnamic aldehyde as indexd component on 3 different layers of Cinnamomi Cortex were analysed respectively
The results were:
1. The cinnamic acid contents of Cassiae Cortex Interior was 0.135%, inner bark layer, 0.031%, peridium, 0.023%, and average, 0.068%.
2. The cinnamic aldehyde contents of Cassiae Cortex Interior was 1.686%, inner bark layer 0.139%, peridium, 0.183%, and average, 0.696%.
From the above results, it is suggested that the main part of Cinnamomi Cortex showed pharmacological activity is its interior.
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