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[求助]
關(guān)于藥動(dòng)學(xué)里方法學(xué)的一段話,不太懂
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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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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. 攜帶污染測(cè)試:三次獨(dú)立測(cè)試,加入定量測(cè)定的最大上限樣本后,加入兩個(gè)經(jīng)過處理的空白基質(zhì)樣品。 |

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版主 (文壇精英)
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這個(gè)你都不知道?不管用什么方法,都有一個(gè)檢測(cè)范圍,超過這個(gè)范圍的測(cè)定結(jié)果是不準(zhǔn)確的。以標(biāo)準(zhǔn)曲線法為例吧,首先用標(biāo)準(zhǔn)物質(zhì)做標(biāo)準(zhǔn)曲線,做完標(biāo)準(zhǔn)曲線后待測(cè)樣品同樣條件(試劑與樣本比例,保溫時(shí)間等)進(jìn)行檢測(cè),一般是測(cè)得吸光度,根據(jù)吸光度查標(biāo)準(zhǔn)曲線得到待檢樣品的值。但標(biāo)準(zhǔn)曲線有一個(gè)范圍,超出這個(gè)范圍的高濃度樣品要經(jīng)過稀釋然后檢測(cè),低濃度樣品就沒法了。根據(jù)方法的最大檢測(cè)限,重復(fù)、回收、干擾、以及你的文章中提到的攜帶污染都要求在這個(gè)濃度下進(jìn)行測(cè)定。 |

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