目的:研究大瑶山甜茶正丁醇部位中的二萜类化学成分,为探索其活性物质奠定基础。方法:采用95%乙醇提取药材,提取液回收至无醇味后溶于水中,依次用石油醚、乙酸乙酯和正丁醇萃取,减压干燥后获得相应萃取物,综合运用各种色谱技术对正丁醇萃取物进行分离纯化,获取二萜类化合物,通过NMR对得到的化合物进行结构鉴定。结果:从大瑶山甜茶中分离得到10个二萜类化合物,分别鉴定为7β, 17-dihydroxy-16β-ent-kauran-19-oic acid 19-O-β-D-glucopyranoside ester (1), 7β, 17-dihydroxy-entkaur-15-en-19-oic acid 19-O-β-D-glucopyranoside ester (2), 13-[(O-β-D-glucopyranosyl)oxy]ent-kaur-16-en-19-oic acid 2-O-β-Dglucopyranosyl-β-D-glucopyranosyl ester (3), 12-α-[(2-O-β-D-glucopyranosyl-β-Dglucopyranosyl)oxy]ent-kaur-16-en-19-oic acidβ-Dglucopyranosyl ester (4), glaucocalyxin G (5),β-D-glucopyranosyl 17-hydroxy-ent-kauran-19-oate-16-O-β-D-glucopyranoside (6),cussoracosides E (7), 17-O-β-D-glucopyranosyl-16α-ent-kauran-19-oic acid (8),cussovantoside A (9),cussovantoside C (10)。结论:化合物1-10首次从大瑶山甜茶中分离得到。