Zwitterionic Surfactant Lysis for A1C Electrochemical Detection
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Solution Overview
Problem
Current point-of-care and home testing systems for blood analytes like A1C face challenges in efficiently lysing red blood cells, oxidizing hemoglobin, and digesting it to release glycated hemoglobin for accurate electrochemical measurement, often resulting in interference and incomplete oxidation, which affects the reliability of long-term blood glucose monitoring in diabetes management.
Innovation Solution
A system utilizing a zwitterionic surfactant like n-Tetradecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (Zwittergent 3-14) for lysing red blood cells, a cationic surfactant and isothiazoline derivative for complete hemoglobin oxidation, and imidazole to facilitate protease digestion, ensuring efficient release of Fructosyl Amino acid oxidase products for accurate electrochemical detection on a test strip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional lysing methods are used to lyse red blood cells, then cell lysis is achieved, but incomplete lysis and interference occur affecting measurement accuracy
Solution Approach 1:
The patent modifies the chemical parameters of the lysing solution by using zwitterionic surfactants with specific HLB values (13-18) and specific molecular structures (containing sulfonate and quaternary ammonium groups). This parameter change enables complete and clean cell lysis without interference, resolving the contradiction between measurement precision and reliability.
2Measurement precision
If conventional oxidation methods are used for hemoglobin, then oxidation occurs, but incomplete oxidation and electrochemical interference occur
Solution Approach 1:
The patent introduces an intermediary substance (iodoacetamide) that facilitates the oxidation of hemoglobin to methemoglobin without causing electrochemical interference. This intermediary enables complete oxidation while eliminating harmful interference, resolving the contradiction between oxidation completeness and electrochemical interference.
Solution Approach 2:
The patent changes the oxidation method by using iodoacetamide instead of conventional oxidizing agents. This parameter change achieves complete oxidation of hemoglobin to methemoglobin without generating electrochemical interference, simultaneously improving measurement precision and eliminating harmful factors.
3Quantity of substance
If minimal dilution of blood samples is used, then sample volume is preserved, but incomplete digestion and release of glycated hemoglobin occur
Solution Approach 1:
The patent modifies the digestion conditions by using specific proteases (trypsin, chymotrypsin, or proteinase K) with optimized concentrations and incubation conditions. This parameter change enables complete digestion and release of glycated hemoglobin even in minimally diluted samples, resolving the contradiction between sample volume preservation and measurement precision.
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 system effectively lyses red blood cells, oxidizes hemoglobin without interference, and digests it to release measurable glycated hemoglobin, providing reliable and efficient A1C determination with improved sensitivity and accuracy for diabetes monitoring, even in minimally diluted samples.
Implementation Method 1
a lysing formulary including a zwitterionic surfactant
Implementation Method 2
an oxidizing formulary including a cationic surfactant and an isothiazoline derivative
Implementation Method 3
a protease formulary including a molecule including an azole
Data Source
AI summary
A system for preparing a sample containing hemoglobin HbA1c for measurement by an electrochemical sensor includes a lysing formulary, the lysing formulary including a zwitterionic surfactant. The system further includes a oxidizing formulary, the oxidizing formulary including a cationic surfactant and a isothiazoline derivative and a protease formulary, the protease formulary including a molecule including an azole.