Ion Exchange Resin Swelling Control via Sugar Alcohol Impregnation
Solution Overview
Problem
Ion exchange resin particles used in pharmaceutical applications are prone to significant swelling when contacted with fluids, which can rupture the diffusion barrier coating and alter the drug release profile, and existing methods for controlling swelling are either ineffective or require high concentrations of impregnating agents that are not compatible with all drugs.
Innovation Solution
Treating ion exchange resin particles with sugar alcohols at concentrations between 0.01% to 10% by weight to control swelling and maintain a stable drug release profile, while reducing the need for washing and enhancing compatibility with pharmacologically active drugs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ion exchange resin particles are used in pharmaceutical applications, then drug delivery function is provided, but significant swelling occurs when contacted with fluids which can rupture the diffusion barrier coating and alter the drug release profile
Solution Approach 1:
The patent applies an impregnating agent (such as polyethylene glycol, propylene glycol, mannitol, lactose, or methylcellulose) as an intermediary substance between the ion exchange resin particles and the surrounding fluid environment. This intermediary layer reduces the direct interaction between water and the resin matrix, thereby controlling the swelling process while maintaining the resin's ion exchange functionality and protecting the diffusion barrier coating from rupture
Solution Approach 2:
The patent modifies the physical-chemical parameters of the ion exchange resin system by introducing impregnating agents that alter the resin's hydration characteristics. These agents change the swelling kinetics and equilibrium state of the resin particles, allowing controlled water uptake while preventing excessive expansion that would compromise the coating integrity
2Object-affected harmful factors
If existing methods are used to control swelling, then some swelling control is achieved, but high concentrations of impregnating agents are required which are not compatible with all drugs
Solution Approach 1:
The patent optimizes the concentration parameter of impregnating agents to achieve effective swelling control at lower levels (1-20% by weight) compared to conventional methods. This parameter optimization reduces the drug-impregnating agent interaction problems while maintaining sufficient swelling control to protect the coating
Solution Approach 2:
The patent applies different impregnating agents or combinations tailored to specific drug-resin systems based on their compatibility requirements. Rather than using a single high-concentration agent universally, the method selects appropriate agents (polyethylene glycol, propylene glycol, mannitol, lactose, or methylcellulose) at optimized concentrations for each specific pharmaceutical application
3Reliability
If diffusion barrier coating is applied to drug-resin complex, then controlled-release is achieved, but the coating is ruptured by resin swelling causing loss of control of diffusion rate
Solution Approach 1:
The patent applies impregnating agents to the ion exchange resin particles before coating with the diffusion barrier. This preliminary treatment creates a cushioning effect by controlling the resin's swelling behavior in advance, preventing excessive expansion forces that would otherwise rupture the subsequently applied coating layer
Solution Approach 2:
The impregnating agent serves as a protective intermediary between the swelling resin matrix and the diffusion barrier coating. This intermediary layer moderates the mechanical stress transmitted from the resin to the coating during hydration, preserving coating integrity while allowing controlled drug release
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 use of sugar alcohols effectively reduces swelling and maintains a stable drug release profile, even under gastrointestinal conditions, with improved compatibility and reduced loss of active pharmaceutical agents, resulting in a shelf-stable coated drug-resin complex.
Implementation Method 1
Treating ion exchange resin particles with sugar alcohols at concentrations between 0.01% to 10% by weight to control swelling
Implementation Method 2
counter ions (e.g., drug ion) in solution can exchange with the ions of the ion exchange resin (e.g., polymer) through an ionic interaction
Implementation Method 3
The active drug elutes from the polymer matrix over time to provide a specific release profile
Data Source
AI summary
The present invention provides a method and composition are provided for loading one or more drugs in a solution onto one or more ion exchange resin particles to form a drug-loaded resin particle. The drug-loaded resin particle is a sustained-release coated layered pharmaceutical drug-ion exchange resin having a one or more pharmaceutically active drugs applied directly to a non-equilibrated ion exchange resin to form a drug-resin complex. The drug-resin complex then coated is shelf stable.