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| 題 名 | Cryo-TEM的先進試片製備技術=Advanced Cryo-TEM Specimen Preparation Technology |
|---|---|
| 作 者 | 黃士炘; 章為皓; | 書刊名 | 科儀新知 |
| 卷 期 | 243 2025.06[民114.06] |
| 頁 次 | 頁55-68 |
| 專 輯 | 「先進TEM試片製備技術」專題 |
| 分類號 | 471.73 |
| 關鍵詞 | 冷凍穿透式電子顯微鏡; Cryo-TEM; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 冷凍電子顯微鏡技術已成為結構生物學研究的關鍵平台,本文將系統性探討冷凍穿透式電子顯微鏡(cryo-TEM)試片製備技術的發展歷程,從Jacques Dubochet開創性的「plunge-freezing」技術,到當代先進的製備方法。首先,無序冰厚度的控制對影像品質至關重要。理想厚度範圍為20-100 nm,需在樣品包埋的完整性與電子穿透率中取得平衡;而空氣-水介面(air-water interface, AWI)的瓶頸,限制了高解析度結構解析的成功率。研究顯示,AWI導致生物分子變性、優先方向性問題及不均勻分佈,將嚴重影響單顆粒分析的重建品質。針對此核心挑戰,筆者整理了三大創新解決策略:(1)載網材料改進,包括石墨烯支持膜、親和性網格及自排濕網格技術;(2)儀器優化方法,涵蓋Spotiton快速冷凍系統、VitroJet無濾紙技術及冷凍聚焦離子束研磨;(3)樣品配方調整,運用介面活性劑、LEA蛋白等保護性添加劑。最後,在材料科學方面,cryo-EM技術也展現了在電池材料、軟物質高分子及電催化劑研究的廣泛應用潛力。 |
| 英文摘要 | Cryo-electron microscopy (cryo-EM) has emerged as a pivotal platform for structural biology research, This review systematically examines the developmental trajectory of cryo-transmission electron microscopy (cryo-TEM) specimen preparation techniques, spanning from Jacques Dubochet's pioneering plunge-freezing methodology to contemporary advanced preparation protocols. First, vitreous ice thickness control proves critical for imaging quality optimization. The ideal thickness range of 20-100 nm necessitates careful balance between sample embedding integrity and electron penetration efficiency. However, the air-water interface (AWI) bottleneck continues to constrain the success rates of high-resolution structural determination. Scientists have demonstrated that AWI-induced biomolecular denaturation, preferred orientation artifacts, and heterogeneous particle distribution significantly compromise single-particle analysis reconstruction quality. Addressing these fundamental challenges, we listed three principal innovative solution strategies: (1) grid material enhancements, encompassing graphene support films, affinity grids, and self-wicking grid technologies; (2) instrumentation optimization approaches, including Spotiton rapid vitrification systems, VitroJet blotting-free methodologies, and cryo-focused ion beam milling techniques; (3) sample formulation modifications utilizing surfactants, LEA proteins, and other protective additives. Finally, in material science applications, cryo-EM technology demonstrates extensive potential for investigations of battery materials, soft matter polymers, and electrocatalyst systems. |
本系統中英文摘要資訊取自各篇刊載內容。