Zinc-Lysine Complex Synthesis via Acidic Zinc Chloride
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Solution Overview
Problem
Existing methods for synthesizing the zinc-lysine complex (ZLC) are inefficient, requiring long reaction times and additional steps for purification, which limits its feasibility on a large manufacturing scale due to excess amino acid and insoluble reagents in the final product.
Innovation Solution
A method involving the combination of zinc chloride with lysine in an aqueous solution, followed by isolation, preferably using a molar ratio of 1:2, and precipitation from ethanol, which results in a faster and more efficient formation of the ZLC complex.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid ZnO is added to a solution of lysine.HCl in water under near-neutral conditions, then the ZLC complex can be formed, but the reaction time becomes long (12 hours) and additional purification steps are required
Solution Approach 1:
The patent changes the pH parameter from near-neutral conditions to acidic conditions (pH 2-4), and changes the zinc source from solid ZnO to soluble zinc chloride. This parameter change enables faster reaction kinetics while maintaining product purity, resolving the contradiction between reaction time and product quality.
2Ease of manufacture
If solid ZnO is used as the zinc source, then the reaction can proceed under near-neutral conditions, but unreacted insoluble reagents remain in the final mixture requiring centrifugation and additional purification steps
Solution Approach 1:
The patent changes the physical state parameter of the zinc source from solid (ZnO) to soluble form (zinc chloride), and adjusts the pH parameter to acidic conditions. This ensures complete dissolution and reaction, eliminating the need for centrifugation and additional purification steps while maintaining high product purity.
3Productivity
If the reaction is performed on a large manufacturing scale, then production volume increases, but the presence of excess amino acid and insoluble reagents hinders product purity and limits feasibility
Solution Approach 1:
The patent implements parameter changes that are scalable: using soluble zinc chloride instead of solid ZnO, and operating at acidic pH (2-4) rather than near-neutral conditions. These changes eliminate insoluble reagent removal steps and excess amino acid issues, enabling large-scale production while maintaining high product purity through simplified processing.
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
This method significantly reduces reaction time and improves the purity of the ZLC, making it more suitable for large-scale production by eliminating the need for additional purification steps and excess reagents.
Implementation Method 1
combining zinc chloride (ZnCl2) with lysine in aqueous solution, to form a complex
Implementation Method 2
precipitation of ZLC by pouring the solution into ethanol
Data Source
AI summary
The disclosure provides an improved synthesis for a zinc-lysine complex having the formula [Zn(C6H14N2O2)2Cl]+Cl−, in which zinc chloride is reacted with lysine, in aqueous solution. The disclosure also provides oral care and personal care compositions comprising the complex prepared by the synthesis, and methods of using these complexes and compositions.