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[求助]
測定藥物釋放曲線是否可以用在比色皿底部放置納米顆粒的方法?
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我想使用介孔硅納米顆粒載藥,由于樣品的量很少,1mL左右,感覺不太適合用透析的方法測釋放曲線,查了一下文獻,看到一篇08年的JACS是這么測定的: _______________________________________________________________ The dye-loaded, stoppered particles (15 mg) were placed in the corner of a cuvette before carefully adding HEPES buffer (50 mM, 12 mL, pH ) 7.5). To open the snap-tops, a solution of PLE [0.12 mL, 10 mg/mL in 3.2 M (NH4)2SO4] was carefully added while the solution was stirred. The emission of rhodamine B in the solution above the particles was measured as a function of time using a 514 nm probe beam (15 mW), both before and after addition of PLE. ———————————————————————————————————————— 簡言之,就是在比色皿底部角落放納米顆粒,然后加入緩沖液,加入另一試劑(某種酶)后,被包裹的染料羅丹明B開始釋放出來,體現(xiàn)在熒光強度的變化上。 這種方法的優(yōu)點時對試劑樣需要得少,但我的疑問是,納米顆粒是如何在角落被放置的?加入溶劑后納米顆粒不就被沖起來,分散在整個溶液體系中了嗎?測得的熒光數(shù)據(jù)不一定是被釋放出來的染料,也有可能是仍被包裹載體中的染料所發(fā)出的熒光吧? 那么測定藥物釋放曲線是否可以用這種方法?如果可以,具體該如何操作?歡迎討論,謝謝 [ Last edited by oasis0709 on 2012-12-10 at 21:03 ] |
TOMA'S INDEX |
銅蟲 (小有名氣)

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另外一篇advanced material也是這么做的 ——————————————————————————————————— Releasing experiments. Guest loaded Si-SS-CD was placed at the bottom of a quartz cuvette which was then filled with PBS. After addition of GSH or DTT, the fluorescence intensity of the solution of guest loaded Si-SS-CD was measured as a function of incubation time. ——————————————————————————————————— 難道dox在硅球內(nèi)和在硅球外的熒光還不一樣嗎? |
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