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ljcxf

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When scanning by  DMA through to  higher temperatures the sample dries out  and Tg estimations of  the dried state can  then be  seen if the sample is  subsequently reanalysed. Initial studies indicated that DMA may give useful data about the Tg of the lyophilized dry  state, and this application could be  inferred from other DMA studies performed on  dry  excipients [9].  This  dry  state  Tg can  be  important in the prediction of the stability of solid dosage form in pharmaceutical products [4].  Lyophilized materials are hygroscopic and so controlled relative humidity (RH) would be vital when looking at these events as the water content would mark- edly  affect the observed Tg.
      DMA has  previously been used to  investigate the glass  transition of the dried state [17]  in pharmaceutically relevant materials. Recently, a study has  been published from Wu  et al. [21]  demonstrating the use  of DMA to determine values for the Tg0  of trehalose along with mDSC and atomic force  microscopy. They  detected in the frozen liquid state the existence of  two transitions at 35 and 28 C by mDSC and suggested that the former was  associated with a glass  transition and the second with a loss  of crystallinity. Double glass  transitions have also  been reported for common amorphous excipients using DSC by Sacha and Nail  [18].
   呵呵，拜托了，語句一定要通順�。∫稽c(diǎn)點(diǎn)翻譯也可以呦！看數(shù)量給獎(jiǎng)勵(lì)哦！

[ Last edited by ljcxf on 2012-2-24 at 14:55 ]

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1樓 2012-02-23 16:18:02

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moqing1991

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【答案】應(yīng)助回帖

愛與雨下(金幣+1): 2012-02-24 21:14:59
ljcxf(金幣+50, 翻譯EPI+1): ★★★★★最佳答案雖然稍有瑕疵，但總體還是很不錯(cuò)的，語句也很通暢，好理解！ 2012-02-24 21:23:05

通過DMA在更高溫度下干燥樣品和Tg估計(jì)的干燥狀態(tài)可以發(fā)現(xiàn)樣品是重新干燥掃描的。初步研究表明，DMA可能會(huì)給有用的數(shù)據(jù)關(guān)于凍干干燥狀態(tài)的Tg，而且從DMA干輔料等研究，可以推斷出此應(yīng)用程序。這種干燥狀態(tài)的Tg在醫(yī)藥產(chǎn)品中的固體劑型的穩(wěn)定性的預(yù)測(cè)方面也很重要。凍干材料具有吸濕性，當(dāng)這些事件的水含量會(huì)明顯影響Tg觀察，因此控制相對(duì)濕度（RH）將是至關(guān)重要的。
DMA以前被用來探討中醫(yī)藥有關(guān)的材料干燥狀態(tài)的玻璃化轉(zhuǎn)變.wu等已經(jīng)做了一些研究。證明MDSC和原子力顯微鏡的DMA使用確定海藻糖Tg0的值。他們發(fā)現(xiàn)在冷凍液體狀態(tài)存在兩個(gè)轉(zhuǎn)變--MDSC在35和28個(gè)C，而且第一個(gè)是玻璃化轉(zhuǎn)變，第二個(gè)是晶體的損失。

贊一下

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2樓2012-02-24 19:50:39