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[求助]
液質聯(lián)用外標法相關問題
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| 請問各位大蝦,小弟要做藥物的液質聯(lián)用檢測,看了很多文獻,都是要用到內標的,但是導師說內標貴,不好買,說用外標法做,我犯糊涂了,液質聯(lián)用如果用外標法的話需要注意什么么?怎么樣才能保證外標法的合理呢??求賜教啊~~ |

木蟲 (小有名氣)
木蟲 (小有名氣)
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用外標法的話要盡可能通過前處理減弱基質效應。確定方法后,通過實際樣品所得的標曲與標準品所得標曲的斜率比值得到矯正后的基質效應的參數,實際樣品測定的含量需要這個矯正參數轉換成基質中該物質的實際含量 Calibration curve slope ratios (matrix matched to pure solvent) were calculated to determine the matrix effects resulting in signal enhancement suppression Signal enhancement occurs if the ratio of the slopes is larger than 100%. If the ratio isless than 100%, it is the indication of signal suppression. According to previous report, a strong matrix effect occurred when the ratios were below 50% or above 150%, and a medium matrix effect would be between 50% and 80% or between 120% and 150%. A ratio between 80% and 120% was considered as no matrix effect, because this variation is close to the repeatable values. 這類分析方法文獻中都用提到,LZ可以看下分析類的這方面文獻 |
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