Dried Amplification Compositions Salt-Free Lyophilization
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Solution Overview
Problem
Existing nucleic acid amplification and detection kits face stability issues due to the presence of inorganic salts, which cause hygroscopicity and unwanted rehydration, leading to reduced storage stability and enzyme activity.
Innovation Solution
Development of compositions with an aqueous solution containing a polymerase, bulking agent, detergent, and organic buffer, with an inorganic salt concentration of 7 mM or less, and dried forms with inorganic salts present at 0.350% or less of the total mass, allowing for long-term storage without refrigeration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic salts are added to stabilize enzymes and facilitate reactions, then enzyme stability and reaction performance are improved, but hygroscopicity increases causing unwanted rehydration and reduced storage stability
Solution Approach 1:
The patent removes inorganic salts from the lyophilized composition to eliminate hygroscopicity and unwanted rehydration. The salts are extracted from the system entirely, and reaction conditions are optimized to function without them, resolving the contradiction between enzyme stability (which traditionally requires salts) and storage stability (which is compromised by salt-induced hygroscopicity).
Solution Approach 2:
The patent changes the chemical composition parameters by eliminating inorganic salts and adjusting buffer compositions to organic-based systems. This parameter change allows the composition to maintain enzyme stability through alternative mechanisms while achieving superior storage stability by eliminating the hygroscopic properties associated with inorganic salts.
2Productivity
If inorganic salts are present in the composition, then nucleic acid hybridization and enzyme activity are enhanced, but the lyophilized cake becomes hygroscopic affecting packaging time and storage duration
Solution Approach 1:
The patent extracts inorganic salts from the composition to eliminate hygroscopicity. This removal prevents moisture absorption that would otherwise extend packaging time and reduce storage duration, thereby resolving the contradiction between reaction efficiency (which traditionally benefits from salts) and time loss during packaging.
Solution Approach 2:
The patent modifies the composition parameters by replacing inorganic salt-based systems with organic buffer systems that lack hygroscopic properties. This parameter change enables faster packaging while maintaining or improving reaction efficiency through optimized organic buffer compositions and enzyme formulations.
3Reliability
If inorganic salts are included to protect proteins under stress conditions, then protein stability is improved, but undesired rehydration occurs negatively impacting activity
Solution Approach 1:
The patent removes inorganic salts from the composition to eliminate the source of hygroscopicity that causes undesired rehydration. By extracting the salts entirely, the patent prevents the harmful rehydration effect while maintaining protein stability through alternative protective mechanisms in the salt-free formulation.
Solution Approach 2:
The patent converts the traditional requirement for inorganic salts (which cause harm through hygroscopicity) into a benefit by developing a salt-free system. The removal of salts, which was initially seen as potentially compromising protein stability, actually proves beneficial by eliminating undesired rehydration while protein stability is maintained through optimized organic buffers and protective additives.
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 provides robust nucleic acid amplification and detection results even after exposure to humid environments, maintaining enzyme activity and stability during storage and reconstitution.
Implementation Method 1
these same salts are undesirable components of formulations that are to be lyophilized and/or stored before use
Data Source
AI summary
The disclosure provides dried compositions providing reagents for nucleic acid amplification, which are essentially free of inorganic salts. Lack of inorganic salts increases stability of such compositions and decreases formation of byproducts. Salts required for use of enzymes in the composition are supplied on reconstitution.