HCV Core Antigen Detection Using Alkaline Detergent Pretreatment
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Solution Overview
Problem
Existing methods for detecting hepatitis C virus (HCV) core polypeptides are prone to false results and interference, leading to unclear or false positives, and do not effectively remove confounding immunoglobulins, which necessitates further costly and time-consuming investigations.
Innovation Solution
A method involving contacting a sample with a base and a cationic detergent, followed by a sandwich immunoassay using capture and detector compounds to detect the HCV core polypeptide, which includes a cationic detergent and optionally a non-ionic detergent, to enhance specificity and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acid treatment is used to disassemble viral particles, then sensitivity of the assay is improved, but false positives increase and immunoglobulins are not effectively removed
Solution Approach 1:
The invention changes the chemical parameter from acid treatment to alkaline treatment (pH 11.5-14.0), which fundamentally alters the denaturation mechanism. Alkaline pH causes irreversible denaturation of immunoglobulins while effectively disassembling HCV particles, resolving the contradiction between sensitivity improvement and false positive reduction
Solution Approach 2:
The invention converts the potentially harmful effect of strong alkaline conditions into a beneficial selective denaturation process. The harsh alkaline environment that could damage proteins is instead used to selectively denature immunoglobulins (reducing false positives) while the cationic detergent protects and solubilizes the viral core polypeptide for detection
2Measurement precision
If chaotropic agents are used to disassemble viral particles, then sensitivity is improved, but susceptibility to interference increases
Solution Approach 1:
The invention replaces chaotropic agents with a combination of alkaline pH and cationic detergent. This parameter change achieves viral particle disassembly through a different mechanism (alkaline denaturation and detergent solubilization) that is less prone to interference from sample matrix components while maintaining high sensitivity
3Measurement precision
If high salt concentrations are used to disassemble viral particles, then sensitivity is improved, but device complexity and cost increase
Solution Approach 1:
The invention changes from high salt concentration treatment to alkaline pH treatment combined with cationic detergent. This simplifies the pre-processing protocol by using a more effective mechanism that requires fewer additional steps and equipment, reducing both device complexity and operational cost while maintaining sensitivity
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
The method provides a highly sensitive and specific detection of HCV core polypeptides, reducing false positives and interference, thereby improving diagnostic accuracy and efficiency.
Implementation Method 1
contacting said sample with a base and with a surfactant comprising a cationic detergent... contacting said sample with a base thereby creating a reaction mixture... incubating said sample at a pH of at least 11.75... alkaline treatment... causing irreversible denaturation of potentially confounding immunoglobulins
Implementation Method 2
contacting said sample with a base and with a surfactant comprising a cationic detergent... aimed at disassembling viral particles in order to increase sensitivity of the assay
Data Source
AI summary
The present invention relates to a method for detecting a corepolypeptide of a hepatitis C virus (HCV) in a sample from a subject comprising (a) contacting said sample with a base and with a surfactant comprising a cationic detergent, and (b) detecting a corepolypeptide of said HCV in said sample. The present invention further relates to a method for pre-processing a sample from a subject for detection of HCV, comprising contacting said sample with a baseand with a surfactant comprising a cationic detergent; and to a pre-processing reagent for detecting HCV in a sample, comprising a base and a surfactant comprising a cationic detergent, wherein said surfactant further comprises a non-ionic detergent. Moreover, the present invention further relates to kits, uses, and devices related to the methods of the present invention.