Bleul R, Ritzi-Lehnert M, Höth J, Scharpfenecker N, Frese I, Düchs D, Brunklaus S, Hansen-Hagge TE, Meyer-Almes FJ, Drese KS. Compact, cost-efficient microfluidics-based stopped-flow device.
Anal Bioanal Chem 2010;
399:1117-25. [PMID:
21116614 DOI:
10.1007/s00216-010-4446-5]
[Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Revised: 11/15/2010] [Accepted: 11/16/2010] [Indexed: 11/26/2022]
Abstract
Stopped-flow technology is frequently used to monitor rapid (bio)chemical reactions with high temporal resolution, e.g., in dynamic investigations of enzyme reactions, protein interactions, or molecular transport mechanisms. However, conventional stopped-flow devices are often overly complex, voluminous, or costly. Moreover, excessive amounts of sample are often wasted owing to inefficient designs. To address these shortcomings, we propose a stopped-flow system based on microfluidic design principles. Our simple and cost-efficient approach offers distinct advantages over existing technology. In particular, the use of injection-molded disposable microfluidic chips minimizes required sample volumes and associated costs, simplifies handling, and prevents adverse cross-contamination effects. The cost of the system developed is reduced by an order of magnitude compared with the cost of commercial systems. The system contains a high-precision valve system for fluid control and features automated data acquisition capability with high temporal resolution. Analyses with two well-established reaction kinetics yielded a dead time of approximately 8-9 ms.
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