Hemoglobin Quantification via Fluorogenic Peroxidase Substrate
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Solution Overview
Problem
Current methods for quantifying hemoglobin, especially at low levels, are inadequate and require improved sensitivity and accuracy.
Innovation Solution
A method involving a peroxidase substrate and hydrogen peroxide is used to oxidize the substrate, forming an oxidation product that is assessed to quantify hemoglobin in a sample, along with a kit and system that includes a peroxidase substrate, hydrogen peroxide, and a solution with basic pH and/or surfactant to prepare samples for hemoglobin quantification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional colorimetric methods are used for hemoglobin quantification, then the method is simple and easy to perform, but the sensitivity is insufficient for low-level detection
Solution Approach 1:
The patent changes the detection parameter from conventional colorimetric measurement to fluorescent measurement. The peroxidase substrate is selected to produce fluorescent oxidation products, and the detection wavelength is optimized (e.g., 535 nm/587 nm for fluorogenic substrates). This parameter change enables detection at much lower concentrations (limit of detection around 2.5 μg/ml) while maintaining procedural simplicity
Solution Approach 2:
The patent replaces the conventional colorimetric detection system with a fluorogenic detection system. By using substrates that produce fluorescent products and detecting at specific fluorescence wavelengths, the method achieves superior sensitivity for low-level hemoglobin quantification compared to traditional colorimetric approaches
2Measurement precision
If hemoglobin is quantified in complex samples containing cellular membranes, then comprehensive detection is achieved, but interference from other components reduces accuracy
Solution Approach 1:
The patent applies local quality by using a basic pH solution (pH 12 or higher) that selectively affects hemoglobin while leaving cellular membranes intact. The high pH conditions denature hemoglobin proteins, releasing heme groups that can be detected, while the membranes remain structurally preserved. This selective treatment improves quantification accuracy by isolating the hemoglobin signal from membrane interference
Solution Approach 2:
The patent uses a basic pH solution as an intermediary agent to selectively treat hemoglobin in complex samples. The high pH solution acts as a mediator that releases heme from hemoglobin without significantly affecting other sample components, thereby enabling accurate detection in the presence of cellular membranes and other biological materials
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 achieves high sensitivity and accuracy, with a limit of detection around 2.5 μg/ml and a limit of quantitation of 10 μg/ml, demonstrating reliability and precision with low relative standard deviations and accurate hemoglobin quantification across various samples.
Implementation Method 1
contacting a sample containing or suspected of containing hemoglobin with a peroxidase substrate and hydrogen peroxide, under suitable conditions, for allowing oxidation of said peroxidase substrate to form an oxidation product
Data Source
AI summary
The present invention relates to methods and compositions for quantifying hemoglobin using, inter alia, a peroxidase substrate and hydrogen peroxide.