Multi-Capillary Optical Detection System for Capillary Electrophoresis
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Solution Overview
Problem
Existing capillary electrophoresis instruments face challenges in efficiently conducting high-throughput UV absorption measurements across multiple capillaries, particularly due to the limitations of deuterium lamps, which result in wasted power and reduced sensitivity.
Innovation Solution
The implementation of a UV laser source that can be focused to a smaller spot size, allowing for efficient UV absorption measurements across multiple capillaries with reduced crosstalk, combined with the use of a reference capillary to mitigate noise, and the integration of visible light sources for fluorescence measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If deuterium lamps are used for UV absorption measurements, then the system can perform measurements, but power is wasted and sensitivity is reduced
Solution Approach 1:
The patent changes the fundamental parameter of the light source from deuterium lamp to UV laser, which fundamentally alters the energy efficiency and sensitivity characteristics. The UV laser provides coherent, monochromatic light that can be focused to smaller spot sizes, reducing power waste and enhancing measurement sensitivity simultaneously.
Solution Approach 2:
The patent replaces the conventional deuterium lamp system with a UV laser system. This substitution involves replacing the broad-spectrum, incoherent light source with a coherent, monochromatic light source that can be precisely focused, thereby eliminating power waste and improving sensitivity.
2Productivity
If measurements are conducted across multiple capillaries simultaneously, then throughput increases, but crosstalk between capillaries occurs
Solution Approach 1:
The patent segments the UV laser beam into multiple separate beamlets using a diffractive optical element or array of lenses. Each beamlet is directed to a specific capillary, allowing simultaneous measurements across multiple capillaries while preventing crosstalk by ensuring each capillary receives light only from its designated beamlet.
Solution Approach 2:
The patent transitions from illuminating capillaries with a single broad beam to using multiple spatially separated beamlets. This dimensional expansion in the spatial domain allows simultaneous targeting of multiple capillaries without interference, as each capillary is illuminated by a distinct beamlet in the beamlet array.
3Device complexity
If a single UV source is used for both UV absorption and fluorescence measurements, then device complexity is reduced, but measurement precision may be compromised
Solution Approach 1:
The patent makes the UV laser source universal by configuring it to serve multiple measurement functions. The same UV laser can be used for UV absorption measurements by detecting transmitted light and for fluorescence measurements by detecting emitted light at different wavelengths, thereby reducing system complexity while maintaining measurement precision through appropriate optical filtering and detection.
Solution Approach 2:
The patent introduces optical intermediaries such as dichroic mirrors, filters, and wavelength-selective components that enable the single UV laser source to perform both absorption and fluorescence measurements. These intermediaries separate the absorption and fluorescence detection paths while using the same excitation source, maintaining measurement precision through spectral discrimination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the sensitivity and efficiency of UV absorption measurements while minimizing power waste and noise, enabling high-quality, high-throughput analysis of protein and other samples.
Implementation Method 1
The implementation of a UV laser source that can be focused to a smaller spot size
Implementation Method 2
efficient UV absorption measurements across multiple capillaries
Implementation Method 3
the integration of visible light sources for fluorescence measurements
Data Source
AI summary
An optical detection system for a capillary electrophoresis instrument is disclosed. The system includes an ultraviolet (UV) source and an absorption measurement optical path. In an embodiment, the optical path comprises a first plurality of optical elements arranged to obtain a plurality of respective UV beamlets from a UV beam emitted by the UV source and to direct the respective UV beamlets transversely through respective capillaries of a plurality of capillaries and to an absorption detector positioned to detect respective signals for use in obtaining respective UV absorption measurements corresponding to the respective capillaries.