Partial Lysis Reagent for Malaria Detection
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Solution Overview
Problem
Current methods for detecting malaria-infected red blood cells are either time-consuming, require skilled personnel, or inaccurately determine the infection ratio due to difficulties in distinguishing between different stages of malaria parasites and reticulocytes, leading to potential misdiagnosis and inappropriate treatment.
Innovation Solution
A reagent comprising a combination of cationic surfactants and a DNA-selective fluorescent dye is used to partially lyse red blood cells, allowing for the retention of malaria parasites and differentiation between single and multi-infected red blood cells based on fluorescence and scattered light intensity, enabling accurate detection and ratio calculation using a flow cytometer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional microscope observation method is used, then malaria infected red blood cells can be detected, but the process is time-consuming (15 minutes or more) and requires sophisticated skills
Solution Approach 1:
The patent replaces the mechanical microscope observation system with a flow cytometry system. The flow cytometer automatically detects malaria infected red blood cells based on fluorescence emission from DNA stains, eliminating the need for manual smear preparation, staining, and microscopic examination. This substitution of detection mechanism reduces detection time to under 15 minutes while maintaining or improving detection accuracy through automated analysis.
Solution Approach 2:
The patent changes the detection parameter from visual observation under microscope to fluorescence intensity measurement. By using DNA-specific fluorescent dyes that bind to malaria parasites, the system converts biological detection into optical measurement, enabling rapid automated detection through flow cytometry while maintaining high measurement precision.
2Extent of automation
If nucleic acid fluorescent dye is used to stain malaria infected red blood cells, then detection can be automated, but reticulocytes are also stained causing inability to discriminate between the two cell types
Solution Approach 1:
The patent applies local quality by using a fluorescent dye that selectively binds to DNA in a specific location (malaria parasite) within the red blood cell, rather than staining all nucleic acids. The DNA-specific dye Hoechst 33258 binds to the malaria parasite's DNA, allowing discrimination between infected red blood cells and reticulocytes based on fluorescence intensity, thereby achieving both automation and precise cell type discrimination.
3Measurement precision
If red blood cells are completely lysed to release malaria parasites, then parasites can be detected, but the procedure becomes troublesome requiring dozens of minutes or more
Solution Approach 1:
The patent applies partial action by using a mild lysing agent that causes partial lysis of red blood cells rather than complete lysis. This partial lysis is sufficient to release malaria parasites from the cell membrane while maintaining cell integrity enough to prevent excessive degradation. The mild lysis condition reduces the required treatment time to under 15 minutes while still achieving effective parasite release for detection.
4Measurement precision
If conventional smear preparation and Giemsa staining method is used, then malaria can be detected, but sophisticated skills are necessary for discriminating infected from uninfected cells and determining malaria type
Solution Approach 1:
The patent replaces the complex mechanical process of smear preparation, fixing, staining, and microscopic observation with an automated flow cytometry system. The system automatically stains red blood cells with fluorescent dyes, detects malaria infected cells based on fluorescence intensity, and calculates infection ratios without requiring sophisticated manual skills. This automation maintains measurement precision while dramatically improving ease of operation.
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 method allows for rapid, accurate, and objective detection of malaria-infected red blood cells, improving diagnostic precision and reducing the risk of misdiagnosis, enabling timely and appropriate treatment by distinguishing between tropical and other forms of malaria.
Implementation Method 1
a first cationic surfactant; and a second cationic surfactant which is different from the first cationic surfactant
Implementation Method 2
staining the malaria parasite with a dye Hoechst 33258, and detecting the parasites with a flow cytometer
Implementation Method 3
measuring fluorescent light and scattered light from the red blood cells in the measuring sample
Data Source
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AI summary
A reagent for partially lysing a cell membrane of a red blood cell infected with a malaria parasite, comprising: a first surfactant which has predetermined lysing ability for the red blood cell membrane; and a second surfactant which has weaker lysing ability than that of the first surfactant; wherein the reagent has pH of 5 to 7 and osmotic pressure of 200 to 300 mOsm/kg·H2O; and wherein the reagent partially lyses the malaria infected red blood cell membrane such that a malaria parasite is retained in the red blood cell and fluorescent dye passes through the cell membrane, is disclosed. A reagent for detecting malaria infected red blood cells, and a sample analyzing method for detecting malaria infected red blood cells, are also disclosed.