Magnetic Microparticle Dispersion in Electrochemiluminescence Analysis
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Solution Overview
Problem
Existing luminescence methods for detecting analytes in liquid samples face challenges in achieving homogeneous distribution and preventing aggregation of protein-coated magnetic microparticles, which affects measurement accuracy and efficiency.
Innovation Solution
A method involving a stirring unit to adapt rotational frequency based on the amount of fluid in a receptacle, ensuring proper dispersion of microparticles, followed by magnetic adhesion to a working electrode and application of excitation energy for luminescence measurement, is employed to detect analytes in a liquid sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic microparticles are added to liquid sample for detection, then sensitivity and specificity of analyte detection is improved, but aggregation of microparticles occurs leading to heterogeneous distribution
Solution Approach 1:
A surfactant is introduced as an intermediary substance between the magnetic microparticles and the liquid sample. The surfactant adsorbs onto the microparticle surfaces, creating a protective layer that prevents aggregation and maintains homogeneous distribution throughout the sample, thereby preserving both detection sensitivity and distribution uniformity
Solution Approach 2:
The patent modifies the surface properties of magnetic microparticles by coating them with specific materials or functional groups. This parameter change in surface chemistry reduces inter-particle attraction forces and prevents aggregation, allowing the microparticles to remain uniformly distributed while maintaining their detection capabilities
2Stability of the object's composition
If stirring is applied to disperse microparticles, then homogeneity of distribution is improved, but foam generation occurs
Solution Approach 1:
The surfactant serves a dual function: it prevents microparticle aggregation and simultaneously suppresses foam formation during stirring. By controlling the air-liquid interface properties, the surfactant allows for effective mixing without the harmful side effect of excessive foam generation
Solution Approach 2:
Instead of applying intense or prolonged stirring that would generate excessive foam, the patent employs gentle or moderate stirring conditions that are sufficient to achieve homogeneous microparticle distribution. This partial action approach achieves the necessary mixing while avoiding the harmful effect of foam generation
3Productivity
If fixed stirring time is used for microparticle dispersion, then process simplicity is maintained, but insufficient or excessive mixing occurs affecting efficiency
Solution Approach 1:
The patent implements a feedback mechanism where the stirring process is monitored in real-time using sensors that detect microparticle distribution uniformity. Based on this feedback, the stirring time is dynamically adjusted - extending stirring if aggregation is detected or terminating early if homogeneity is achieved, thereby optimizing analysis efficiency and preventing time loss
Solution Approach 2:
The stirring process transitions from a static, fixed-time operation to a dynamic, adaptive process. The stirring parameters (time, speed) are continuously adjusted based on the actual state of microparticle dispersion, allowing the system to achieve optimal mixing efficiency while minimizing unnecessary time consumption
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 ensures consistent and efficient analyte detection by maintaining microparticle homogeneity, reducing foam generation, and optimizing analysis time, facilitating automation of the detection process.
Implementation Method 1
a magnetic field is applied to the measurement cell for magnetic adhesion of the protein coated magnetic microparticles to a working electrode of the measurement cell
Implementation Method 2
a marker; incubating the mixture comprising the analyte, the protein coated magnetic microparticles, and the marker in an incubator
Implementation Method 3
applying an excitation energy for causing luminescence; measuring of the luminescence for acquisition of a measurement signal
Data Source
AI summary
An electrochemiluminescence method of detecting an analyte in a liquid sample and a corresponding analysis system. An analyte in a liquid sample is detected by first providing a receptacle containing a fluid comprising protein coated magnetic microparticles to a stirring unit. Stirring of the fluid is necessary since the density of the microparticles is usually higher than the density of the buffer fluid. Thus the microparticles tend to deposit on the bottom of the receptacle leading to an aggregation of the microparticles because of weak interactions. To obtain representative measurements a homogeneous distribution of the microparticles in the buffer fluid is necessary to ensure a constant concentration of microparticles for each analysis cycle. It is further necessary to provide disaggregation of the microparticles, which is also realized by stirring the fluid. Stirring is conducted with a rotational frequency that is adapted to the amount of fluid to be stirred.