樟树落叶棕黑色色素的稳定性及其应用

Stability and Application of Dark Red Pigment Isolated from Dry Leaves of Cinnamomum Camphora

从樟树落叶中提取得到的棕黑色色素在ｐＨ４．０～８．０的水溶液中对光、热稳定；在ｐＨ３．５以下易于析出；ｐＨ高于６．５的溶液呈橙红色；ｐＨ低于６．２为橙黄色．这种棕黑色色素对大肠杆菌、金黄色葡萄球菌、枯草杆菌、巨大芽孢杆菌、苏云金芽孢杆菌及毛霉等６种菌均有不同程度的抑制作用，其抑菌浓度（ＭＩＣ５０）为１００～４００μｇ／ｍＬ．

The dark red pigment isolated from dry leaves of Cinnamomum camphora has high stability in the solutions with pH 4.0￣8.0 and precipitates in the solutions with pH below 3.5. The color of the pigment solution with pH above 6.5 is reddish orange and is orange below pH 6.2. In addition, this kind of dark red pigment has effective inhibitory activities against Escherichia coli, Staphylococcus aureaus, Bacillus megatherium, Bacillus subtilis, Bacillus thuringiensis and Mucor sp . The MI C 50 of the pigment is 100￣400 μg/mL.