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weercog

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[求助] 关于药动学里方法学的一段话,不太懂

Linearity of calibration curves, LLOD and LLOQ
       LLOQ can be quantitated with accuracy within 15% of nominal and precision not exceeding 15% CV, and was 4.0 ng/mL for TB-II and 3.9 ng/mL for TA-III. LLOD of TB-II and TA-III was obtained when the solution was diluted to 1.8 ng/mL and 1.6 ng/mL, respectively, and the signal-to-noise ratio was 2-fold. The calibration curve of TB-II was y = 0.3379x + 0.02973 (r = 0.9978) and was y = 1.778x−0.02613(r = 0.9989) for TA-III. The difference between the nominal standard concentration and the back-calculated concentration from the weighed linear regression line was varied from−4.3% to 4.6% for each point on the standard curve (CV varied from 1.7% to 8.2%).
  Carry-over was tested by injecting two processed blank matrix samples subsequently after injection of an ULOQ (the upper limit of quantification) sample in three independent runs.The response in the first blank matrix at the retention time of the analytes should be less than 20% of the mean response of a LLOQ sample for the
analytes. The response in the first blank matrix at the retention time of the analytes was less than 7% of the mean response at the LLOQ for TA-III and 3% for TB-II. Therefore, the carry-over test was found to be acceptable.
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RXMCDM

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一般这种情况是,举个可能不是很恰当的例子哈。假如用注射器抽样品,抽完后去掉,尽管注射器内是空的,但实际有少量的残留,因此用注射器抽空白样品进行检测,测定值不是零。然后去掉,在抽空白样品,两次空白样品测得的值应该是不一样的。根据这两个数据计算携带污染率。
3楼2014-05-13 22:03:29
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RXMCDM

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★ ★ ★
weercog: 金币+3, 翻译EPI+1, ★★★很有帮助 2014-05-14 17:53:24
Carry-over was tested by injecting two processed blank matrix samples subsequently after injection of an ULOQ (the upper limit of quantification) sample in three independent runs.
携带污染测试:三次独立测试,加入定量测定的最大上限样本后,加入两个经过处理的空白基质样品。
2楼2014-05-13 21:59:13
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weercog

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引用回帖:
2楼: Originally posted by RXMCDM at 2014-05-13 21:59:13
Carry-over was tested by injecting two processed blank matrix samples subsequently after injection of an ULOQ (the upper limit of quantification) sample in three independent runs.
携带污染测试:三次 ...

那个最大上限样本是怎么来的,
4楼2014-05-14 17:54:37
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RXMCDM

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4楼: Originally posted by weercog at 2014-05-14 17:54:37
那个最大上限样本是怎么来的,...

这个你都不知道?不管用什么方法,都有一个检测范围,超过这个范围的测定结果是不准确的。以标准曲线法为例吧,首先用标准物质做标准曲线,做完标准曲线后待测样品同样条件(试剂与样本比例,保温时间等)进行检测,一般是测得吸光度,根据吸光度查标准曲线得到待检样品的值。但标准曲线有一个范围,超出这个范围的高浓度样品要经过稀释然后检测,低浓度样品就没法了。根据方法的最大检测限,重复、回收、干扰、以及你的文章中提到的携带污染都要求在这个浓度下进行测定。
5楼2014-05-14 18:04:45
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