Dehydroascorbic Acid Stability in Polyol Solvents
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Solution Overview
Problem
Vitamin C in the form of dehydroascorbic acid (DHAA) is unstable and difficult to manufacture and absorb, leading to its limited use in dietary supplements and skin care products, despite its potential for faster absorption and stronger antiviral effects compared to ascorbic acid (AA).
Innovation Solution
A stable liquid composition of DHAA is achieved by dissolving ascorbic acid in pure polyol solvents, such as glycerol, with a concentration of 50% or more, which maintains stability and allows for efficient absorption and use in both topical and dietary applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dehydroascorbic acid is used as a source of vitamin C, then absorption rate and antiviral effects are improved, but stability is worsened
Solution Approach 1:
The patent changes the physical-chemical parameters of DHAA by formulating it in anhydrous conditions (removing water) and adjusting pH to specific ranges (3.5-5.5), which fundamentally alters its stability profile while preserving its high absorption rate and antiviral properties
Solution Approach 2:
The patent introduces buffering agents and chelating agents as intermediary substances that mediate between DHAA's inherent instability and the desired stability. These intermediaries control pH and sequester metal ions that would otherwise catalyze DHAA degradation
2Reliability
If dehydroascorbic acid is used as a source of vitamin C, then antiviral effects are enhanced, but manufacturing difficulty increases
Solution Approach 1:
The patent performs preliminary stabilization actions during manufacturing by adjusting pH and adding stabilizing agents before the product is completed, ensuring DHAA remains stable throughout storage and use without requiring complex post-manufacturing processing
Solution Approach 2:
The patent modifies manufacturing parameters by using anhydrous conditions and specific pH ranges, which simplify the manufacturing process by eliminating the need for complex stabilization procedures while maintaining high antiviral efficacy
3Quantity of substance
If ascorbic acid is dissolved in water, then solubility is improved, but stability is worsened
Solution Approach 1:
The patent creates an inert environment by using anhydrous conditions (removing water) and controlling oxygen exposure, which prevents oxidation and degradation of DHAA while maintaining adequate solubility through the use of polyol solvents and pH adjustment
Solution Approach 2:
The patent changes the solvent system from aqueous to anhydrous polyol-based solutions and adjusts pH to 3.5-5.5, which simultaneously maintains solubility while dramatically improving DHAA stability by eliminating water-catalyzed degradation pathways
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 stable DHAA composition provides a highly absorbable source of vitamin C with extended shelf life, enhanced antiviral effects, and improved absorption rates compared to AA, making it suitable for dietary supplements, skin care products, and research applications without the need for chemical stabilizers or preservatives.
Implementation Method 1
A stable liquid composition of DHAA is achieved by dissolving ascorbic acid in pure polyol solvents, such as glycerol, with a concentration of 50% or more
Data Source
AI summary
The invention relates to stable liquid compositions containing the oxidized form of vitamin C known as dehydroascorbic acid (DHAA). The compositions comprise DHAA and a pharmacologically acceptable liquid organic polyol solvent. The polyol solvent comprises about 50% or greater of the total weight of the composition. The compositions are useful as dietary supplements, skin-enhancers, concentrates, or research solutions.