1. Introduction
The genus Dendrobium, containing of 1,100 species or more all over the world, is one of the largest groups of the family Orchidaceae. There are 76 species of Dendrobium in China, including 74 species and two varieties [1], of which the dried stem of D. officinale is listed in the Chinese pharmacopoeia under the name of Dendrobii Officinalis Caulis (Tie-pi-shi-hu) as an individual entry [2]. According to Traditional Chinese Medicine theory, the main function of D. officinale is to nourish yin and clear away heat-evil, tonifying the stomach and promoting fluid [2]. It was used for maintaining stomach tonicity, promoting body fluid production, and relieving symptoms such as throat dryness and dry eyes with blurred vision in the clinic, and was found to possess immunostimulating [3,4,5] and antitumor effects [6].
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