Lysis Buffer pH Stability via Zwitterionic Composition
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Solution Overview
Problem
Prior art lysis buffers have stability issues at high pH ranges, are susceptible to neutralization by carbon dioxide, have limited buffering capacity, and cannot effectively handle very acidic or basic food matrices, leading to interference with nucleic acid amplification and detection processes.
Innovation Solution
An aqueous composition comprising zirconium oxide particles, a non-ionic surfactant, an organic iron-chelating reagent with specific affinity constants, and a zwitterionic buffer at a pH range of 7.7-8.3, which provides enhanced buffering capacity and stability, allowing for effective nucleic acid amplification across a wider range of food matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high pH range (9.8-10.5) is used in lysis buffer, then cell lysis efficiency is improved, but the buffer becomes susceptible to neutralization by carbon dioxide and has stability issues
Solution Approach 1:
The patent optimizes the pH range of the lysis buffer to 8.45-8.85, which is lower than conventional high pH buffers (9.8-10.5) but still effective for cell lysis. This parameter change reduces susceptibility to carbon dioxide neutralization while maintaining adequate lysis efficiency. The buffer capacity is enhanced through specific component concentrations to maintain stability in this optimized pH range.
2Ease of manufacture
If conventional lysis buffer composition is used, then simple preparation is achieved, but buffering capacity is limited and cannot handle very acidic or basic food matrices
Solution Approach 1:
The patent creates a composite buffer system by combining multiple components: Tris base, zwitterionic buffer (such as HEPES or MOPS), iron-chelating agents (EDTA or EGTA), and surfactants. This composite approach provides enhanced buffering capacity across a wider pH range (including very acidic and basic conditions) while maintaining ease of preparation through a standardized recipe with specific concentrations of each component.
3Adaptability or versatility
If high concentration of buffer components is used to increase buffering capacity, then ability to handle acidic or basic matrices is improved, but interference with nucleic acid amplification increases
Solution Approach 1:
The patent optimizes the concentrations of buffer components to achieve adequate buffering capacity without excessive interference. Specifically, Tris base is used at 10-50 mM, zwitterionic buffer at 10-50 mM, and iron-chelating agents at optimized levels. These parameter adjustments provide sufficient buffering for acidic and basic food matrices while minimizing inhibition of nucleic acid amplification reactions.
Solution Approach 2:
The patent introduces zwitterionic buffers (such as HEPES or MOPS) as intermediary buffering agents that provide buffering capacity without the harmful effects of high Tris concentrations. These zwitterionic compounds act as mediators that maintain pH stability while being less interfering with enzymatic reactions in nucleic acid amplification compared to conventional high-concentration Tris buffers.
4Adaptability or versatility
If pH range is widened to handle diverse food matrices, then adaptability is improved, but stability against neutralization by carbon dioxide worsens
Solution Approach 1:
The patent sets the operating pH range to 8.45-8.85, which is narrower than attempting to cover extremely wide pH ranges but is optimally positioned to balance adaptability and stability. This pH range is high enough to effectively lyse cells and handle most food matrices while being low enough to resist rapid neutralization by atmospheric carbon dioxide. The buffer system is designed to maintain this specific range through optimized component ratios.
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 solution enhances the stability and buffering capacity of the lysis buffer, enabling faster and more reliable nucleic acid amplification and detection, particularly in samples with acidic or basic food matrices, by maintaining a stable pH and reducing interference from food matrix compounds.
Implementation Method 1
a zwitterionic buffer at a pH range of 7.7-8.3, which provides enhanced buffering capacity and stability
Implementation Method 2
an organic iron-chelating reagent with specific affinity constants
Implementation Method 3
a non-ionic surfactant
Data Source
AI summary
An aqueous composition, for example a composition for use as a lysis buffer, comprising zirconium oxide particles, a surfactant at a concentration greater than or equal to 0.005% (mass/volume), an organic, iron-chelating reagent having a first affinity constant greater than or equal to 104.2 with respect to ferric iron and a second affinity constant less than 103.8 with respect to magnesium (as determined in 20° C. deionized water at pH 8.45), and a buffer. The aqueous composition has a pH no less than 7.7 and less than 8.45, more particularly 7.8-8.3, in all cases when measured at 20° C. Methods of using the composition and kits comprising components of the aqueous compositions.