ULOQ準確度僅90%,多稀釋幾倍進樣就能達到100%?
各位老師好,我想請教一個問題:LCMS分析時進樣量5微升ULOQ準確度僅90%,其他濃度點準確度達100%左右,線性我設(shè)置了LLOQ、中間有六個濃度,然后ULOQ共8個濃度點。當我進樣量改為1微升時候ULOQ準確度也變成100%左右恢復(fù)正常。原先是200微升溶液加入到400微升水中配置成的上樣樣品。進樣量仍然為5微升,把50微升溶液加到950微升水中,相當于多稀釋了幾倍上樣濃度。ULOQ準確度就為100%左右了就正常了。這是什么原因呢?查看色譜峰型也都正常。
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1) 90% accuracy of ULOQ is good enough. It meets all agency's requirements.
2) the reason for ULOQ is less than other standard's accuracy is due to the saturation, so the curve is a little bend,
when you dilute it or less volume injection, the detector satuation problem is gone.
會不會是檢測器響應(yīng)飽和了