虎耳草精油化学成分及其抑菌活性
Chemical Constituents and Antibacterial Activity of Essential Oil from Saxifraga stolonifera

采用水蒸气蒸馏法提取虎耳草精油，通过气相色谱-质谱联用法(GC-MS)对精油进行成分分析。鉴定出35种化学成分，占总馏出峰面积的 78.22%，主要成分为十五烷酸27.93%， (2E,5E)-3,4,5,6-四甲基-2-5-辛二烯6.28%、邻苯二甲酸丁酯辛酯5.54%、9-十六碳烯酸5.01%。生长速率法测定表明，虎耳草精油对小麦全蚀病菌和番茄早疫病菌的抑制活性较高，在500 mg/L剂量下抑制率均在90%以上；对玉米大斑病菌和油菜菌核病菌在750 mg/L剂量下的抑制率在80% 以上，而对其他几种病菌的抑制率相对较低。
The essential oil of Saxifraga stolonifera was extracted by steam distillation. Components of the essential oil were analyzed by GC-MS and 35 components were identified, accounting for 78.22% of total compositions. The essential oils mainly consisted of pentadecanoic acid(27.93%), (2E,5E)-3,4,5,6-tetramethy -2,5-octadiene(6.28%), phthalic acid,butyl octyl ester(5.54%) and 9-hexadecenoic acid (5.01%). The test of inhibition rate against mycelial growth showed that essential oil from Saxifraga stolonifera had good antifungal effects, and the inhibition rates surpassed 90% at the concentrations of 500 mg/L against gaeumannomyces graminis and Alternaria solani, at 500 mg/L dose，and above 80% of Exserohilum turcicum and sclerotinia scleroticorum，at 750 mg/L dose，and the rest of the fungus had weaker inhibition.