界面自组装氟化物磁性纳米粒子形成多功能液滴,用于生物相容的单细胞培养和磁驱动操控。

Multifunctional Droplets Formed by Interfacially Self-Assembled Fluorinated Magnetic Nanoparticles for Biocompatible Single Cell Culture and Magnet-Driven Manipulation.

机构信息

Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing 400016, China.

Department of Dermatology, Laboratory of Dermatology, Clinical Institute of Inflammation and Immunology, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu 610041, China.

出版信息

ACS Appl Mater Interfaces. 2023 Apr 5;15(13):17324-17334. doi: 10.1021/acsami.2c23003. Epub 2023 Mar 24.

Abstract

The ability to encapsulate and manipulate droplets with a picoliter volume of samples and reagents shows great potential for practical applications in chemistry, biology, and materials science. Magnetic control is a promising approach for droplet manipulation due to its ability for wireless control and its ease of implementation. However, it is challenged by the poor biocompatibility of magnetic materials in aqueous droplets. Moreover, current droplet technology is problematic because of the molecule leakage between droplets. In the paper, we propose multifunctional droplets with the surface coated by a layer of fluorinated magnetic nanoparticles for magnetically actuated droplet manipulation. Multifunctional droplets show excellent biocompatibility for cell culture, nonleakage of molecules, and high response to a magnetic field. We developed a strategy of coating the F-MNP@SiO on the outer surface of droplets instead of adding magnetic material into droplets to enable droplets with a highly magnetic response. The encapsulated bacteria and cells in droplets did not need to directly contact with the magnetic materials at the outer surface, showing high biocompatibility with living cells. These droplets can be precisely manipulated based on magnet distance, the time duration of the magnetic field, the droplet size, and the MNP composition, which well match with theoretical analysis. The precise magnetically actuated droplet manipulation shows great potential for accurate and sensitive droplet-based bioassays like single cell analysis.

摘要

具有皮升级样本和试剂的封装和操控能力的液滴在化学、生物学和材料科学的实际应用中具有很大的潜力。由于其无线控制能力和易于实现,磁控是一种很有前途的液滴操控方法。然而,由于磁性材料在水液滴中的生物相容性差,因此存在挑战。此外,由于液滴之间的分子泄漏,当前的液滴技术存在问题。在本文中,我们提出了一种具有表面涂覆有氟化物磁性纳米粒子层的多功能液滴,用于磁驱动的液滴操控。多功能液滴具有优异的细胞培养生物相容性、分子无泄漏性和对磁场的高响应性。我们开发了一种在液滴外表面涂覆 F-MNP@SiO 的策略,而不是将磁性材料添加到液滴中,从而使液滴具有高磁响应性。封装在液滴中的细菌和细胞不需要直接与外表面的磁性材料接触,显示出对活细胞的高生物相容性。这些液滴可以根据磁体距离、磁场持续时间、液滴大小和 MNP 组成进行精确操控,这与理论分析非常吻合。精确的磁驱动液滴操控对于基于液滴的生物分析(如单细胞分析)具有很高的准确性和灵敏度。

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