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An automated electrokinetic continuous sample introduction system for microfluidic chip-based capillary
Qiao-Hong He1, Qun Fang, Wen-Bin Du
1Institute of Microanalytical Systems, Chemistry Department, Zhejiang University, Hangzhou 310028, China.
The Analyst
|June 21, 2005
Summary
A novel automated system enables continuous sample introduction for microfluidic capillary electrophoresis (CE). This breakthrough allows for high-throughput analysis with minimal sample consumption, advancing automated analytical techniques.
Area of Science:
- Analytical Chemistry
- Microfluidics
- Separation Science
Background:
- Microfluidic chip-based capillary electrophoresis (CE) offers miniaturization and high efficiency.
- Automated sample introduction is crucial for high-throughput CE analysis.
- Existing sample introduction methods can be time-consuming and require significant sample volumes.
Purpose of the Study:
- To develop an automated and continuous sample introduction system for microfluidic chip-based CE.
- To create an efficient world-to-chip interface for seamless sample transfer.
- To demonstrate the system's performance in analyzing multiple samples sequentially.
Main Methods:
- A Z-shaped fused silica capillary probe was horizontally connected to a crossed-channel microfluidic chip.
- A programmable linear platform held an array of sample vials, alternating samples and working electrolyte.
- Electrokinetic injection was used to continuously introduce samples and electrolyte from vials onto the chip.
Main Results:
- The system successfully demonstrated continuous introduction of sequential samples.
- High throughput of 36 samples per hour was achieved.
- Low carryover (<1.0%) and good reproducibility (4.6% RSD for arginine, 3.2% for FITC, 4.0% for phenylalanine) were obtained.
- Minimal sample consumption of 240 nL per sample was recorded.
Conclusions:
- The developed automated system provides an efficient and continuous sample introduction solution for chip-based CE.
- This method significantly enhances throughput and reduces sample volume requirements.
- The system is suitable for high-throughput analysis and determination of various analytes, such as FITC-labeled amino acids.