Burdock leaf extract as well as extraction method and application thereof

The invention discloses a burdock leaf extract as well as an extraction method and application thereof. The extraction method of the burdock leaf extract comprises the following steps of mixing superfine ground burdock leaves with an acidified ethanol solution, then carrying out ultrasonic extraction, treating concentrated supernate through a macroporous adsorption resin column, carrying out vacuum drying, grinding and sieving to obtain the burdock leaf extract. The burdock leaf extract disclosed by the invention has a good application effect in preparing a salmonella infection resisting preparation and killing salmonella strains in an environment, and is suitable for popularization and application. 本发明公开了一种牛蒡叶提取物及其提取方法和应用，所述牛蒡叶提取物的提取方法为：将超微粉碎牛蒡叶用酸化乙醇溶液混合后超声提取，浓缩后的上清液通过大孔吸附树脂柱处理，真空干燥，粉碎过筛，即得。本发明所述牛蒡叶提取物在制备抗沙门氏菌感染制剂及消杀环境中沙门氏菌株中的应用效果良好，适于推广应用。