The major drawback of online SP-LC techniques is the limited throughput, since it is difficult to achieve a high level of parallel sample preparation in an online mode. Thus, it is crucial to shorten the analysis time of each run. Time consumption can be lowered in two ways: one is the utilization of efficient SP methods such as TFC, MEPS and MAE techniques; the other is to shorten the LC analysis time. The latter one can be achieved using UPLC. UPLC has been
a new instrument available in recent years and well accepted as a powerful analytical tool for its rapid separation, high sensitivity and improved throughput [189,190]. In some cases, the separation can be finished within 2 min via UPLC-MS/MS methods. The online combination between SP and UPLC (SP-UPLC) is expected to be an efficient approach for the rapid ultra-trace analysis of complex samples.
The major drawback of online SP-LC techniques is the limited throughput, since it is difficult to achieve a high level of parallel sample preparation in an online mode. Thus, it is crucial to shorten the analysis time of each run. Time consumption can be lowered in two ways: one is the utilization of efficient SP methods such as TFC, MEPS and MAE techniques; the other is to shorten the LC analysis time. The latter one can be achieved using UPLC. UPLC has beena new instrument available in recent years and well accepted as a powerful analytical tool for its rapid separation, high sensitivity and improved throughput [189,190]. In some cases, the separation can be finished within 2 min via UPLC-MS/MS methods. The online combination between SP and UPLC (SP-UPLC) is expected to be an efficient approach for the rapid ultra-trace analysis of complex samples.
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