Open-Source Absorbance Detector with Multiple Deep UV-LEDs for On-Capillary Multiwavelength Detection at a Single...

Area of Science:

• Analytical Chemistry
• Instrumentation Science

Background:

• Multiwavelength ultraviolet photometric detection (UV-PD) offers comprehensive analytical data.
• Existing capillary-scale multiwavelength UV-PD systems are often expensive and complex.

Purpose of the Study:

• To develop a cost-effective, open-source absorbance detector for on-capillary multiwavelength detection.
• To enable simultaneous multiwavelength UV-PD for capillary electrophoresis (CE) and high-performance liquid chromatography (HPLC).

Main Methods:

• Utilized three deep UV light-emitting diodes (235, 255, 278 nm) with individual photodetectors.
• Integrated components using 3D-printed parts and an Arduino board for data acquisition.
• Designed three optical paths converging on the capillary for simultaneous detection.

Main Results:

• Successfully developed a portable, low-cost absorbance detector for on-capillary multiwavelength UV-PD.
• Demonstrated simultaneous detection of medicines using both HPLC and CE.
• Validated the detector's capability for comprehensive analytical information at the capillary scale.

Conclusions:

• The developed detector provides a significant advancement in accessible analytical instrumentation.
• This open-source device has broad implications for portable, low-cost chemical analysis.
• Facilitates enhanced detection capabilities for pharmaceutical analysis and other fields.