Dimeric Double Metal Salts of Hydroxycitric Acid for Stability
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Solution Overview
Problem
The therapeutic use of (-)-hydroxycitric acid (HCA) salts is limited by their poor absorption and chemical instability at acidic pH, particularly in the gastrointestinal tract, and their hygroscopic nature, which makes them unsuitable for stable dry or liquid delivery formats.
Innovation Solution
A dimeric double metal salt composition of HCA, specifically a magnesium-potassium salt with a relative molar ratio of 1:3.5 to 1:4.5, is developed through a process involving extraction, purification, partial neutralization, and hydrolysis to enhance stability and bioavailability, allowing for formulation in dry, liquid, and controlled-release delivery systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monomeric HCA salts (calcium, potassium, sodium) are used, then biological activity is achieved, but absorption is poor and chemical instability occurs at acidic pH
Solution Approach 1:
The patent employs dimeric double metal salt compositions containing multiple metal ions (calcium, potassium, sodium, magnesium) in specific molar ratios to create a composite salt structure. This composite approach stabilizes the HCA molecule against acid-induced lactonization while maintaining biological activity and improving absorption efficiency compared to monomeric salts.
Solution Approach 2:
The patent systematically varies the molar ratios of different metal ions in the double metal salt composition to optimize both stability and absorption. By adjusting parameters such as the proportion of alkali metal to alkaline earth metal ions, the formulation achieves enhanced chemical stability at acidic pH while maintaining or improving bioavailability.
2Reliability
If potassium HCA salt is used for biological availability, then appetite suppression and fat metabolism effects are achieved, but the compound is extremely hygroscopic and cannot be maintained as stable powder
Solution Approach 1:
The patent combines potassium HCA with other metal salts (calcium, sodium, magnesium) in specific ratios to create a composite double metal salt. This composite formulation maintains the biological activity and appetite suppression effects of potassium HCA while reducing its extreme hygroscopicity, enabling stable powder formulation for dry delivery formats.
3Ease of operation
If HCA salts are exposed to acidic milieu of mammalian gut, then dissolution occurs, but inactivation via lactonization reduces therapeutic effectiveness
Solution Approach 1:
The patent applies preliminary protective action by formulating HCA as a double metal salt composition that is pre-stabilized against acid-induced lactonization. The multiple metal ions in the composition create a protective effect before the compound encounters gastric acid, preventing inactivation and maintaining therapeutic effectiveness throughout digestion.
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 dimeric double metal salt composition improves the bioavailability and stability of HCA, enabling effective appetite suppression, fat metabolism increase, weight loss, and reduced blood lipids, with superior absorption compared to traditional monomeric HCA salts.
Implementation Method 1
hydrolyzing the lactone component of the fully neutralized liquid HCA/lactone concentrate mixture of step c by heating the mixture to at least about 60° C. until the pH of the mixture is stable from about pH 8.8 to about pH 9.2
Implementation Method 2
extracting HCA from a dried Garcinia rind with demineralized (DM) water in an extractor for at least about 6 hours to yield a first Garcinia extract
Data Source
AI summary
The present invention relates to soluble dimeric double metal salt compositions of (−)-hydroxycitric acid (“HCA”), as well as methods for making and using the same. The invention provides dimeric double metal salts of group IA and IIA of HCA (hereinafter, “DDM-HCAs”). The present invention provides methods to make DDM-HCAs of the invention which can be employed to alter the polar/ionic qualities of HCA salts and derivatives to improve solubility of HCA compositions. DDM-HCAs of the invention are soluble HCA-containing compositions useful as dietary supplements and suitable for manipulations under those conditions necessary for tabletting, encapsulation, and the production of dry powders, particularly for use as a beverage premix. Methods of use of the composition include treatment for suppression of appetite, for weight loss, for an increase in the rate of fat metabolism, for reduction in blood lipids and postprandial lipemia, and to increase the plasma level of (−)-hydroxycitric acid.