中文摘要：

目的研究铁皮石斛的化学成分。方法采用硅胶色谱法、HP2MGL型大孔树脂色谱法、Sephadex LH-20、SephadexG-25凝胶色谱法、RP-HPLC制备柱色谱法进行分离纯化,通过现代波谱技术进行结构鉴定。结果鉴定了10个化合物,分别为2-甲氧基苯基-1-O-β-D-芹糖-（1→2）-β-D-葡萄糖苷（1）,3,4,5-三甲氧基苯基-1-O-β-D-芹糖-（1→2）-β-D-葡萄糖苷（2）,leo-nuriside A（3）,（1′R）-1′-（4-羟基-3,5-二甲氧基苯基）-1-丙醇-4-O-β-D-葡萄糖苷（4）,左旋丁香脂素（5）,丁香脂素-4,4′-O-双-β-D-葡萄糖苷（6）,（＋）-丁香脂素-4-O-β-D-吡喃葡萄糖苷（7）,icariol A2-4-O-β-D-glucopyranoside（8）,（＋）-lyoniresinol-3a-O-β-D-glu-copyranoside（9）,裂异落叶松脂醇（10）。结论 1为新化合物,2～4,6～10为首次从本属植物中发现,5为首次从本植物中发现。

英文摘要：

OBJECTIVE To study the chemical constituents of Dendrobium candidum.METHODS The compounds were isolated and purified by repeated column chromatography with silica gel,HP2MGL macroporous resin,Sephadex LH-20,Sephadex G-25 and RP-HPLC.Their structures were identified by spectroscopic data.RESULTS Ten compounds were isolated from Dendrobium candidum,and identified as： 2-methoxyphenol-O-β-D-apiofuromosyl-（1→2）-β-D-glucopyranoside（1）,khaephuouside（2）,leonuriside A（3）,（1′R）-1′-（4-hydroxy-3,5-dimethoxylphenyl） propan-1′-ol 4-O-β-D-glucopyranoside（4）,（-） syringaresinol（5）,syringaresinol-4,4′-O-bis-β-D-glucoside（6）,（＋）-syringaresinol-4-β-D-monoglucoside（7）,icariol A2-4-O-β-D-glucopyranoside（8）,（＋）-lyoniresinol-3a-O-β-D-glucopyranoside（9） and（-）-secoisolariciresinol（10）.CONCLUSION Compoud 1 is a new compound,compound 5 was isolated from Dendrobium candidum for the first time,and others were isolated from the Dendrobium species for the first time.