kylabs
第11楼2011/05/28
这种胺类的化合物,要么加酸,同时加离子对试剂,形成中性物,用C18柱做。
要么就是特殊的亲水柱,在酸性条件下带电,不加离子对试剂,条件可以和LC/MS兼容,比如说这三种胺类:
柱子:Cogent Diamond Hydride™, 4µm, 100A
流动相:A: DI water + 0.1% formic acid
B: 90% acetonitrile + 0.1% formic acid + 0.005% TFA
梯度:Gradient:
Time | %B | Time | %B |
0.0 | 100 | 9.0 | 85 |
5.0 | 100 | 10.0 | 85 |
6.0 | 95 | 12.0 | 70 |
7.0 | 95 | 12.1 | 100 |
Post Time | 5 min. |
Flow Rate | 0.4 mL/min. |
Sample | Synthetic human urine |
Peaks | 1. L ?Arginine 175 m/z RT = 12.83 min 2. L ?Lysine 147 m/z RT = 13.49 min 3. L - Histidine 156 m/z 14.42 min |
Detection | ESI -pos - Agilent 6210 MSD TOF mass spectrometer |