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Nanofluidic resistive pulse sensing for characterization of extracellular vesicles
Lab on a Chip ( IF 6.1 ) Pub Date : 2024-07-25 , DOI: 10.1039/d4lc00364k
Madalena R C Calado 1 , Teresa C Lage 1 , Daniel A M André 1 , Carlos Calaza 1 , Carlos Marques 1 , Carolina Herrero 2, 3 , João Piteira 1 , Lars Montelius 1 , Dmitri Y Petrovykh 1 , Lorena Diéguez 1 , Alar Ainla 1
Affiliation  

This paper describes the development, design and characterization of a resistive pulse sensing (RPS) system for the analysis of size distributions of extracellular vesicles (EVs). The system is based on microfluidic chips fabricated using soft-lithography and operated in pressure-driven mode. This fabrication approach provided reproducible pore dimensions and the best performing chip design enabled, without calibration, sizing of both 252 nm and 460 nm test particles within 8% of theoretically calculated values, based on the size specifications provided by suppliers. The number concentration measurement had higher variations and without calibration provided estimates within an order of magnitude, for sample concentrations across 4 orders of magnitude. The RPS chips could also measure successfully EVs and other biological nanoparticles in purified samples from cell culture media and human serum. A compact, fast and inexpensive RPS system based on this design could be an attractive alternative to current gold-standard techniques for routine characterization of EV samples.

中文翻译:


用于表征细胞外囊泡的纳米流体电阻脉冲传感



本文介绍了用于分析细胞外囊泡 (EV) 尺寸分布的电阻脉冲传感 (RPS) 系统的开发、设计和表征。该系统基于使用软光刻制造的微流控芯片,并在压力驱动模式下运行。这种制造方法提供了可重复的孔径尺寸和性能最佳的芯片设计,无需校准即可根据供应商提供的尺寸规格,将 252 nm 和 460 nm 测试颗粒的尺寸控制在理论计算值的 8% 以内。数量浓度测量具有较高的变化,并且在没有校准的情况下提供了一个数量级内的估计,对于跨越 4 个数量级的样品浓度。 RPS 芯片还可以成功测量细胞培养基和人血清纯化样品中的 EV 和其他生物纳米颗粒。基于此设计的紧凑、快速且廉价的 RPS 系统可能会成为当前 EV 样品常规表征黄金标准技术的有吸引力的替代方案。
更新日期:2024-07-25
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