Methionine-Stabilized Insulin Formulations Against Oxidative Degradation
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Solution Overview
Problem
Insulin preparations, including insulin analogs and derivatives, suffer from chemical instability due to oxidative processes caused by oxygen, leading to issues such as haze and precipitation, which are exacerbated by storage conditions and affect their efficacy in maintaining stable blood glucose levels.
Innovation Solution
Incorporating methionine into aqueous formulations of insulin, insulin analogs, and insulin derivatives enhances their chemical stability by mitigating the adverse effects of oxygen, thereby maintaining formulation quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulin preparations are stored in aqueous formulations, then they maintain their biological activity and solubility, but they suffer from chemical instability due to oxidative processes
Solution Approach 1:
Methionine is introduced as an intermediary substance that mediates between oxygen and insulin. It acts as a sacrificial antioxidant that preferentially reacts with oxygen through oxidation to methionine sulfoxide, thereby protecting insulin from oxidative degradation. This intermediary mechanism resolves the contradiction by allowing aqueous formulation (maintaining solubility) while preventing oxidative damage through the protective role of methionine.
Solution Approach 2:
The patent converts the harmful oxidative effect into a beneficial protective mechanism. By adding methionine, the formulation allows controlled oxidation of methionine instead of insulin, transforming the harmful oxidative process into a protective action. The methionine oxidation products (methionine sulfoxide) are less harmful than insulin oxidation, and can even be reduced back to methionine by cellular systems, thus converting a degradation pathway into a protective sacrifice.
2Reliability
If antioxidants are added to protect insulin from oxidation, then chemical stability improves, but formulation complexity increases
Solution Approach 1:
The patent changes the chemical composition parameter by incorporating methionine at specific concentrations (0.01-10 mM). This parameter change provides a simple, quantifiable solution that improves stability without requiring complex multi-component systems. The straightforward addition of a single amino acid component maintains formulation simplicity while effectively addressing oxidative stability.
3Reliability
If methionine is added to insulin formulations, then oxidative stability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a relatively wide concentration range for methionine (0.01-10 mM), allowing for partial action rather than requiring precise optimal concentration. This range provides a buffer that accommodates normal manufacturing variations without compromising effectiveness. The excessive action principle is applied by using concentrations that are sufficiently high to ensure protection even at the lower end of the range, eliminating the need for ultra-precise concentration control during manufacturing.
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 addition of methionine improves the stability of insulin formulations, reducing impurities and high molecular mass proteins, ensuring consistent insulin activity and effectiveness over time.
Implementation Method 1
chemical instability due to oxidative processes caused by oxygen
Data Source
AI summary
The invention relates to an aqueous pharmaceutical formulation having insulin, an insulin analog, or an insulin derivative, and methionine; and to the production thereof, to the use thereof for treating diabetes mellitus, and to a medication for treating diabetes mellitus.