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[Calcium oxalate crystals in several kinds of Cinnamon bark]
1National Institute for the Control of Pharmaceutical and Biological Products, Beijing 100050.
Objective:
To probe into the morphology and distribution characteristics of calcium oxalate crystals in several kinds of Cinnamon bark.
Method:
Forty samples of ten different species of Cinamomi Cortex were examined, and the inter-cellular calcium oxalate crystals in the phloem rays were observed by optical microscope and scanning electron microscope.
Result:
It was found that for samples of the same botanical origin, there is little variation in the crystal morphology following certain regularity. The amount, size and ultra-micromorphologic characteristics are influenced by various factors.
Conclusion:
The pattern of morphology and distribution of calcium oxalate crystals may well be an index for identification of the crude drug of Cinnamon bark.