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USP鹽酸米諾環(huán)素溶出度測定 已有1人參與
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如題,對(duì)于USP鹽酸米諾環(huán)素溶出度項(xiàng)下計(jì)算想跟各位同仁討論一下。 藥典原文涉及計(jì)算部分的摘錄如下: Standard stock solution: 0.11 mg/mL of USP Minocycline Hydrochloride RS in Medium Standard solutions: Dilute the Standard stock solution with Medium to obtain solutions with final concentrations of 0.088 mg/mL, 0.0528 mg/mL, 0.0352 mg/mL, 0.022 mg/mL, and 0.0176 mg/mL. Sample solution: dissolution solution Injection size: 20 μL for the 4 and 24 h time points; 50 μL for the 48 and 72 h time points Analysis: Construct a calibration curve for each sampling interval by plotting the concentration of the Standard solutions versus peak area. Calculate the slopes and y-intercepts using linear regression analysis. Calculate the release rate of minocycline: Resulti = [(rUi − yi)/Si] × 10/( i × W × A) i =sampling time, 4, 24, 48, 72 h rUi=peak response from each of the Standard solutions at time i yi =y-intercept of the calibration curve at sampling time i Si =slope of the calibration curve at sampling time i W =weight of the sample (mg) A =amount of minocycline in the sample (mg/mg of sample) as determined in the Assay 說明:溶出介質(zhì)體積10ml, Tolerances Time (h) Release Rate (μg/h) Average of 6 Measurements 0–4 NLT 25 4–24 NLT 1.0 24–48 NLT 0.2 48–72 NLT 0.05 具體溶出內(nèi)容與計(jì)算相關(guān)性不大,未摘錄,如有需要可以提供。 問題:1 按照說明,計(jì)算公式與i時(shí)間的溶出液沒有關(guān)系嗎?(溶出的樣品溶液,Sample solution沒參與計(jì)算); 2 如果公示中rUi寫錯(cuò),實(shí)為Sample solution的峰面積,這個(gè)計(jì)算最后的單位也無法得到ug/h? 3 不同時(shí)間進(jìn)樣體積不一致,這種不一致也未在計(jì)算公式中體現(xiàn)出來。 本人非常困惑,還請(qǐng)廣大同仁指點(diǎn)指點(diǎn),謝謝。 |

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