Polysaccharide Liquid Viscosity Reduction via Ultrasonic Irradiation
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Solution Overview
Problem
Chemical modification of polysaccharides at high concentrations is hindered by high viscosity and potential structural changes at elevated temperatures, leading to incomplete reactions and depolymerization.
Innovation Solution
A method involving the irradiation of a mixture of polysaccharides and an aqueous solvent with ultrasound at temperatures below the gelation point, using frequencies between 20 kHz and 400 kHz, and output of 20 W/L or less, to maintain low viscosity without depolymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polysaccharide solution concentration is increased to 10% (w/v) or more, then reaction yield is improved, but viscosity becomes high and reaction becomes incomplete
Solution Approach 1:
The invention applies ultrasonic irradiation as a physical field parameter to change the rheological properties of polysaccharide solutions. By introducing ultrasonic energy (20-400 kHz frequency range), the solution viscosity is reduced without changing chemical composition or temperature, enabling high concentration solutions to flow and react effectively
Solution Approach 2:
Ultrasonic irradiation introduces high-frequency mechanical vibrations into the polysaccharide solution. This vibration energy disrupts the intermolecular associations and hydrogen bonding networks that cause high viscosity, allowing the solution to flow more freely while maintaining high polysaccharide concentration
2Ease of operation
If heating at 70°C or more is applied to reduce viscosity, then fluidity is improved, but depolymerization and structural changes occur
Solution Approach 1:
The invention replaces thermal energy input with ultrasonic mechanical energy input. Instead of using heat (70°C or more) to reduce viscosity, ultrasonic irradiation is applied to achieve the same fluidity improvement through mechanical vibration, thereby avoiding thermal degradation, depolymerization, and racemization of the polysaccharide structure
Solution Approach 2:
Ultrasonic irradiation induces a transient phase disruption in the polysaccharide solution structure. The high-frequency vibrations temporarily break the gel-like network formation, transitioning the system from a high-viscosity state to a low-viscosity state without permanent chemical changes or thermal damage to the polymer chains
3Ease of operation
If ultrasonic irradiation is applied to liquefy gelatinous substance, then viscosity is reduced, but depolymerization occurs
Solution Approach 1:
The invention applies ultrasonic irradiation at controlled, moderate intensity levels that are sufficient to reduce viscosity through disruption of intermolecular associations, but not excessive enough to cause chain scission and depolymerization. This partial action achieves the desired fluidity while preserving the polysaccharide molecular weight and structural integrity
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 approach allows for the production of a polysaccharide liquid with low viscosity and high concentration, maintaining the polysaccharide structure, facilitating efficient chemical modification and reducing solvent and energy usage.
Implementation Method 1
irradiating an ungelled mixture of a polysaccharide and an aqueous solvent with ultrasound
Implementation Method 2
irradiating a mixture of a polysaccharide and an aqueous solvent at a temperature lower than the gelation temperature
Data Source
AI summary
A liquid material including a polysaccharide is manufactured by creating a mixture of polysaccharides and an aqueous solvent or an aqueous cosolvent with organic solvents at a temperature at which gelation does not occur. The mixture is also irradiated at this lower temperature, such as with ultrasound waves in combination with stirring and/or bubbling of inert gases. to apply ultrasound to a mixture of. Compared with conventional reactions with low concentration solutions, the product yield and advantageous mechanical properties are significantly increased. Depolymerization (decomposition, disassembly) of polysaccharide in the liquid material does not occur to any substantial degree, and the molecular structure of the polysaccharide is maintained. Further, the liquid material does not gel even when the temperature is raised, and thus, its fluidity is maintained, despite polysaccharides being maintained at a high concentration. The liquid material is applicable to myriad industries, including pharmaceuticals and health foods.