Solvent-Free Pharmaceutical Coating via Powder Mixing
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Solution Overview
Problem
Existing methods for coating solid pharmaceutical preparations are complex and time-consuming, often requiring multiple stages and the use of solvents, which can be detrimental to acid-sensitive drugs and increase operational labor.
Innovation Solution
A method involving the mixing of powdered hydroxypropylmethylcellulose acetate succinate (HPMCAS) with a powdered plasticizer and wetting agent, followed by a single layering process using a solvent-free precursor mixture, allowing for efficient coating by spraying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional coating methods using organic solvents or aqueous dispersions are employed, then coating materials can be applied effectively, but the process requires long drying times and solvents must be removed
Solution Approach 1:
The invention extracts and eliminates the solvent component from the coating system entirely. By using pure polymeric powder without any organic solvent or water, the patent removes the drying step completely, as there is no solvent to evaporate. This directly resolves the contradiction by taking out the problematic element (solvent) that caused the time loss.
Solution Approach 2:
The invention changes the physical state and composition parameters of the coating material from a solvent-based solution to a pure polymeric powder. This parameter change eliminates the need for solvent evaporation and drying processes, thereby improving productivity without incurring time losses associated with conventional drying methods.
2Object-affected harmful factors
If polymeric powder alone is used for coating, then solvent-free coating is achieved, but adhesion of the polymer to core particles is poor requiring two-stage coating process
Solution Approach 1:
The invention introduces a surfactant as an intermediary substance that facilitates adhesion between the polymeric powder and core particles. The surfactant acts as a mediator that improves wetting and bonding properties, allowing the polymeric powder to adhere properly to the core particles without requiring a preliminary wax coating stage, thus simplifying the overall process.
Solution Approach 2:
The invention creates a composite coating system combining polymeric powder and surfactant. This composite material approach allows the surfactant to enhance the adhesive properties of the polymer, enabling effective single-stage coating without the need for multiple processing steps required by pure polymeric powder alone.
3Ease of manufacture
If liquid ingredients and solid ingredients are sprayed separately, then coating can be performed, but the operation becomes complicated
Solution Approach 1:
The invention merges the surfactant and polymeric powder into a single dry powder mixture that can be sprayed together in one operation. This combining of components into a unified sprayable formulation eliminates the need for separate spraying operations for liquid and solid ingredients, greatly simplifying the manufacturing process and improving ease of operation.
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 the time and labor required for coating, enables the use of a single layering process, and avoids the use of solvents, making it more efficient and suitable for sensitive drugs.
Implementation Method 1
mixing the precursor mixture and a solid pharmaceutical preparation, as a mixing step, to produce a mixture product; wherein the mixing step comprises continually spraying the precursor mixture onto the solid pharmaceutical preparation
Implementation Method 2
heating the mixture product, as a heating step, to obtain a coated solid pharmaceutical preparation
Data Source
AI summary
Provided is a method of manufacturing a solid pharmaceutical preparation which enables the coating using spraying of powder, containing HPMCAS, alone and requiring only a single layering process. The method of manufacturing a solid pharmaceutical preparation coated with a solvent-free coating material essentially includes the steps of: mixing a powdered hydroxypropylmethylcellulose acetate succinate, a powdered plasticizer, and a powdered wetting agent in advance, as a preliminary mixing step, to prepare a precursor mixture; mixing the precursor mixture and a solid pharmaceutical preparation, as a mixing step, to produce a mixture product; and heating the mixture product, as a heating step, to obtain a coated solid pharmaceutical preparation.