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The stems of Dendrobium officinale Kimura et Migo, named Tie-pi-shi-hu,is one of the most endangered and precious species in China. Because of its variouspharmacodynamic effects, D. officinale is widely recognized as a high-quality health foodin China and other countries in south and south-east Asia. With the rising interest ofD. officinale, its products have a high price due to a limited supply. This high price has ledto the proliferation of adulterants in the market. To ensure the safe use of D. officinale, afast and convenient method combining normal and fluorescence microscopy was appliedin the present study to distinguish D. officinale from three commonly used adulterantsincluding Zi-pi-shi-hu (D. devonianum), Shui-cao-shi-hu (D. aphyllum), Guang-jie-shi-hu(D. gratiosissimum). The result demonstrated that D. officinale could be identified by thecharacteristic “two hat-shaped” vascular bundle sheath observed under the fluorescencemicroscopy and the distribution of raphides under normal light microscopy. The other threeadulterants could be discriminated by the vascular bundle differences and the distribution ofraphides under normal light microscopy. This work indicated that combination of normal lightand fluorescence microscopy is a fast and efficient technique to scientifically distinguishD. officinale from the commonly confused species.
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