Leukocyte Reagent for Rapid Subtype Differentiation
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Solution Overview
Problem
Current methods for differentiating and counting leukocytes in blood samples face challenges such as slow detection speed, inability to identify immature cells, and decreased accuracy due to temperature variations and aging of blood samples, with existing reagents requiring lengthy stabilization times and using toxic substances.
Innovation Solution
A reagent comprising cationic cyanine compounds, cationic surfactants, nonionic surfactants, and anionic compounds that quickly lyse erythrocytes and platelets, fluorescently label nucleic acids, and differentiate leukocytes into five subtypes within a short time, maintaining accuracy across varying temperatures and in aged blood samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional reagents are used for leukocyte differentiation, then leukocytes can be differentiated into subtypes, but the detection speed is slow and stabilization time is lengthy
Solution Approach 1:
The patent modifies the chemical composition parameters of the reagent by incorporating specific cationic compounds (formula I), nonionic surfactants (formula II), and anionic compounds (formula III) with optimized molecular structures and concentrations. This parameter optimization enables rapid cell lysis and staining within seconds, eliminating the lengthy stabilization period of conventional reagents while maintaining accurate leukocyte differentiation into five subtypes
Solution Approach 2:
The patent creates a composite reagent system combining three distinct compound classes: cationic compounds for rapid membrane disruption and nucleic acid binding, nonionic surfactants for membrane solubilization, and anionic compounds for charge balance and stability. This composite formulation achieves synergistic effects that enable both speed and accuracy in leukocyte differentiation
2Measurement precision
If conventional methods are used, then leukocyte counting can be performed, but accuracy decreases due to temperature variations and blood sample aging
Solution Approach 1:
The patent optimizes the pH, ionic strength, and chemical composition parameters of the reagent to create a buffered system that maintains stable chemical properties across a broad temperature range (4-40°C). The specific ratios of cationic, nonionic, and anionic compounds are tuned to ensure consistent cell lysis and staining efficiency regardless of temperature fluctuations or sample storage duration, thereby maintaining measurement precision
Solution Approach 2:
The reagent formulation includes stabilizing components that preemptively counteract the effects of temperature variation and sample aging. The composite chemical system is designed to resist degradation and maintain functionality even when blood samples are stored for extended periods before analysis, cushioning against the negative effects of delays in the detection process
3Reliability
If conventional reagents are used, then leukocyte differentiation is possible, but toxic substances are required
Solution Approach 1:
The patent replaces toxic conventional staining agents with biocompatible cationic compounds (formula I) that bind to nucleic acids through electrostatic interactions rather than toxic covalent bonding. The modified chemical parameters include using mild surfactants and physiologically compatible salts, achieving reliable leukocyte differentiation into five subtypes without requiring hazardous substances
Solution Approach 2:
The patent employs a reagent system designed for single-use disposable test cartridges, eliminating the need for toxic substance handling and disposal infrastructure. The reagent is formulated to be effective at low concentrations and is discarded after one use, reducing cumulative toxic exposure while maintaining differentiation accuracy
4Productivity
If rapid detection is implemented, then detection speed improves, but ability to identify immature cells is lost
Solution Approach 1:
The patent employs multi-parameter flow cytometry measurement, analyzing cells simultaneously based on forward scatter (size), side scatter (granularity), and fluorescence intensity (nucleic acid content). This dimensional approach to data collection enables rapid throughput while capturing multiple cellular characteristics that distinguish immature from mature leukocytes, preventing information loss despite speed improvements
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
Enables rapid and accurate differentiation and counting of leukocyte subtypes, including immature and abnormal cells, with improved detection speed and reduced equipment costs by maintaining stability across a broader temperature range and in aged blood samples.
Implementation Method 1
comprises a cationic cyanine compound... fluorescently label nucleic acids... detecting the fluorescent intensity information and scattered light intensity information
Implementation Method 2
comprises cationic surfactants... nonionic surfactants... quickly lyse erythrocytes and platelets
Implementation Method 3
detecting the fluorescent intensity information and scattered light intensity information of the leukocytes
Data Source
AI summary
The present disclosure discloses a reagent for differentiating and counting leukocytes which includes: (1) cationic cyanine compounds selected from those having the following general formulae I and II; (2) cationic surfactants selected from those having the following general formulae III, IV and/or V; (3) at least one nonionic surfactant; and (4) optionally, at least one anionic compound selected from those having one or more carboxyl or sulphonyl groups; and optionally includes alcohol compounds. Also disclosed is a kit comprising the reagent for differentiating and counting leukocytes. Further disclosed is a method for differentiating and counting leukocytes using the reagent and kit. Use of the reagent, kit and method disclosed enables the identification of leukocytes in blood samples into five subtypes in a very short time, or at least achieves the differentiation and counting of four leukocyte groupings. Moreover, immature and abnormal cells can be identified.