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[求助] 关于高效液相,加入标品后,相应峰反而减小,这是为什么啊

在做发酵液的检测,看看有没有一种化合物吡咯喹啉醌,打了外标和样品在同一时间出峰,然后做内标的时候相应峰的峰面积反而减小了,还减少很多,这是什么情况啊。求大神指教
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