1.中山大学分析测试中心,广东 广州510275
2.中山大学孙逸仙纪念医院,广东 广州510120
3.华南师范大学化学学院,广东 广州510006
郭琳娜(1987年生),女;研究方向:纳米材料电子显微结构表征及分析;E-mail:guoln5@mail.sysu.edu.cn
梁超伦(1981年生),男;研究方向:纳米材料电子显微结构分析;E-mail:liangchl@mail.sysu.edu.cn
收稿:2024-12-13,
录用:2025-02-24,
网络出版:2025-03-24,
纸质出版:2025-07-25
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郭琳娜,于元元,郑春雄等.脂质体和外泌体透射电镜样品前处理及形态观察[J].中山大学学报(自然科学版)(中英文),2025,64(04):62-68.
GUO Linna,YU Yuanyuan,ZHENG Chunxiong,et al.Liposome and exosome pre-treatment for transmission electron microscopy and morphological observation[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2025,64(04):62-68.
郭琳娜,于元元,郑春雄等.脂质体和外泌体透射电镜样品前处理及形态观察[J].中山大学学报(自然科学版)(中英文),2025,64(04):62-68. DOI: 10.13471/j.cnki.acta.snus.ZR20240350.
GUO Linna,YU Yuanyuan,ZHENG Chunxiong,et al.Liposome and exosome pre-treatment for transmission electron microscopy and morphological observation[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2025,64(04):62-68. DOI: 10.13471/j.cnki.acta.snus.ZR20240350.
优化脂质体及胰腺癌细胞外泌体的透射电子显微镜(TEM, transmission electron microscopy)样品前处理条件,以提高透射电镜下的成像质量并保护样品结构完整性。针对脂质体和外泌体在TEM下成像衬度弱、结构易受损的问题,系统探索了一系列样品前处理实验方法,包括滤膜除尘、琼脂糖凝胶柱纯化、磷钨酸负染、真空加热干燥及提取液浓度稀释等。通过透射电镜观察,分析了不同实验条件下脂质体及外泌体的形态特征,并讨论了其对透射电镜成像效果的影响,从而为得到更真实可靠、满足分析要求的透射电镜形态结构观察表征提供参考依据。结果表明,相比常规磷钨酸负染法,脂质体样品经滤膜除尘及凝胶柱纯化后成像效果得到提升。对于外泌体样品,优化磷钨酸负染时间及样品浓度,其尺寸分布均匀,形态特征明显。
This study aims at optimizing the pre-treatment method for liposome and exosome derived from pancreatic cancer cells in transmission electron microscopy (TEM) to enhance imaging quality and preserve sample structural integrity. To overcome the challenges of poor contrast and structural vulnerability during TEM imaging for liposomes and exosomes, a thorough investigation of various pre-treatment methods was conducted, including filter membrane dust removal, agarose gel column purification, phosphotungstic acid (PTA) negative staining, vacuum heating drying, and extraction solution dilution. The morphological characteristics of liposomes and exosomes under these pre-treatment conditions were analyzed. Each of these pre-treatment methods was evaluated for its impact on the quality of TEM imaging and the preservation of the samples’ structural integrity. The results offer an insight for achieving more authentic and reliable TEM morphological characterizations, ensuring compliance with rigorous analytical standards. The results showed that, compared to the conventional PTA negative staining method, the imaging quality of liposome samples was improved after filter membrane dust removal and gel column purification. For exosome samples, optimizing PTA negative staining time and sample concentration could result in uniform distribution and distinct morphological features.
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