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肽聚糖类型鉴定 (DAP类型分析)
Published at 2021-03-17 19:54
Author:jiangxw
View:611
菌体的培养与收集 :通过离心收集菌体,离心后室温风干,将干菌体置于 4 ℃冰箱中保存。
菌体水解:取少量菌体装入硬质安瓿管中,加入 6 mol/L HCl 0.3 ml,封口,120 ℃(砂浴)水解 12 h 左右;
点样 :取用于氨基酸分析的水解液在纤维素板上点样 (毛细吸管约5-10次,依样品浓度而定), 标准品 0.01 mol/ml DAP (同时含有 L-DAP,meso-DAP 和 D-DAP)(毛细吸管约 10 次左右); (0.01 mol/ml DAP 的配制:用0.1 mol/ml HCL 稀释原溶液)
展层 :展层系统为甲醇:吡啶:冰乙酸:水=10:1:0.25:5(V/V)。上行法展层;
显色: :氨基酸分析用 0.4% 茚三酮丙酮溶液,100~110 ℃加热 2~3 min(蓝色), 结果如图示。
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