Hydroxyethyl Starch Modification for Iron Carrier Stability
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Solution Overview
Problem
Current methods for producing hydroxyethyl starch as a carrier for metal ions, such as iron, are inadequate, particularly in terms of reliability and stability, leading to side effects and inefficiencies in iron supplementation for patients with end-stage renal disease undergoing hemodialysis.
Innovation Solution
A method involving the dissolution of hydroxyethyl starch in water, pH adjustment, treatment with a cyanide compound, and subsequent heat treatments to introduce heptonic acid residues, enhancing its hydrophilicity and stability as a carrier for metal ions, specifically iron ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dextran is used as iron carrier, then iron supplementation can be provided, but anaphylactic side effects occur due to anti-streptococci antibodies reacting onto dextrans
Solution Approach 1:
The patent extracts the problematic dextran component from the iron carrier system and replaces it with hydroxyethyl starch, which does not trigger anaphylactic reactions while maintaining iron complexing capability
Solution Approach 2:
The patent changes the chemical structure parameter of the carbohydrate carrier from dextran to hydroxyethyl starch with specific molecular weight (55,000-85,000 g/mol) and substitution degree (0.45-0.55), eliminating immunogenicity while preserving iron complexing function
2Productivity
If conventional hydroxyethyl starch manufacturing methods are used, then production can proceed, but high amounts of hydroxyethyl starch cannot be produced in a reliable manner
Solution Approach 1:
The patent optimizes critical process parameters including pH adjustment to 8.0-10.0 before cyanide addition, heating to 80-99°C for first treatment, then pH adjustment to 2.0-4.0 and heating to 50-90°C for second treatment, achieving reliable high-volume production with consistent product quality
Solution Approach 2:
The patent performs preliminary pH adjustment and temperature control steps before the main complexing reaction to ensure optimal conditions for heptonic acid residue formation, enabling reliable large-scale production
3Stability of the object's composition
If hydroxyethyl starch is modified with heptonic acid residues, then complex stability with metal ions increases, but manufacturing process complexity increases
Solution Approach 1:
The patent modifies hydroxyethyl starch by controlling pH and temperature parameters during cyanide compound treatment to form heptonic acid residues at terminal glucosyl positions, enhancing complex stability through systematic parameter optimization
Solution Approach 2:
The patent creates a composite structure by combining hydroxyethyl starch with heptonic acid residues through chemical modification, producing a material with enhanced metal ion complexing stability while maintaining manufacturability
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 modified hydroxyethyl starch effectively complexes with metal ions, improving stability and bioavailability, reducing side effects and enhancing iron supplementation efficacy.
Implementation Method 1
complexes of iron ions with polymeric carbohydrates like dextran or organic compounds like sucrose or gluconate to form polynuclear complexes with metal ions
Implementation Method 2
a cyanide compound is added to the hydroxyethyl starch solution. Then the solution is heated to a temperature of 80 to 99 °C
Data Source
Figure 1
AI summary
The invention relates to a method for manufacturing a modified hydroxyethyl starch carrying a heptonic acid residue on at least one of its termini. According to the invention, the following steps are carried out: a) dissolving hydroxyethyl starch in water, b) adjusting the p H value to a value of 8.0 to 10.0, c) adding a cyanide compound to the hydroxyethyl starch solution, heating the solution to a temperature of 80 to 99 ° C and keeping it at this temperature for a first time period, and d) adjusting the p H value to a value of 2.0 to 4.0, bringing the solution to a temperature of 50 to 90 ° C and keeping it at this temperature for a second time period.