Porous Starch Probiotic Encapsulation via Ultrasonic and Ethanol Precipitation
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Solution Overview
Problem
Current methods for preparing porous starch fail to control pore size, porosity, and morphology, which affects its efficiency as a carrier for probiotics, leading to poor retention rates under environmental stressors like heat and oxygen.
Innovation Solution
A method involving ultrasonic treatment, alcohol precipitation, and convective drying of amylose-amylopectin suspensions to create porous starch with controllable pore sizes between 1 to 1000 nm, forming 'perfect circular' pores suitable for encapsulating probiotics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional methods (enzymatic, ethanol-alkali, acid hydrolysis, molecular insertion) are used to prepare porous starch, then porous starch can be obtained, but the starch granules undergo large shrinkage and deformation, and pore properties (size, volume, porosity, morphology) cannot be controlled
Solution Approach 1:
The patent changes the chemical composition parameters by using compound starch with controlled amylose-to-amylopectin ratios (0.1:1 to 1:0.1), and adjusts processing parameters including ultrasonic power (20-60 W/ml), ethanol addition rate (5-25 ml/min), and drying temperature (35-75°C) to precisely control pore size, porosity, and morphology while avoiding starch granule shrinkage and deformation
Solution Approach 2:
The patent replaces traditional mechanical/chemical aggressive methods with ultrasonic field treatment and controlled ethanol precipitation. The ultrasonic physical field promotes gelatinization and melting without mechanical damage, and ethanol precipitation creates pores through interfacial tension formation rather than direct mechanical stress, achieving pore formation with preserved starch granule shape
2Reliability
If porous starch is used as carrier for probiotics, then probiotics can be encapsulated, but retention rate is poor under environmental stressors like heat and oxygen
Solution Approach 1:
The patent utilizes the controlled porous structure of starch (with pore sizes from 1 to 1000 nm) as an encapsulating carrier. The porous structure provides high surface area and porosity (30-80%) for probiotic encapsulation, while the controlled pore dimensions and distribution create a protective barrier that reduces exposure to harmful environmental factors including heat and oxygen, thereby improving probiotic retention rate under stress conditions
3Manufacturing precision
If amylose content is increased from 0% to 80%, then pore size gradually decreases, but the complexity of process control increases
Solution Approach 1:
The patent establishes a feedback control system where the amylose-to-amylopectin ratio is systematically varied (0.1:1 to 1:0.1) and the effects on pore size are monitored and recorded. This feedback mechanism allows identification of the optimal ratio range (50-80% amylose) that achieves desired pore sizes (1-1000 nm) while maintaining process stability, reducing the complexity of controlling other variables
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 method enhances the retention rate of probiotics by up to 95% under heat treatment and 15% under freeze-drying conditions, providing effective protection and improved biological function.
Implementation Method 1
using an ultrasonic physical field to promote the gelatinization and melting of the compound starch solutions
Implementation Method 2
performing alcohol precipitation on the gelatinized solutions of starch chains in dispersed state timely
Implementation Method 3
ethanol anti-solvent method
Implementation Method 4
convective drying and stretching to form pores
Implementation Method 5
convective drying
Implementation Method 6
establishment of interfacial tension for stretching
Implementation Method 7
moisture migration
Implementation Method 8
using adsorption characteristics of the nanoscale pores of the porous starch
Data Source
AI summary
The present disclosure discloses a preparation method of porous starch for encapsulating probiotic, and belongs to the field of food processing. The present disclosure provides porous starch with controllable pore size and morphology by regulating the ratio of amylose to amylopectin (quantitative compounding), keeping starch hydroxyl sites exposed (concentration cultivation), and building interfacial tension to stretch starch chains (convection drying), and uses the porous starch to encapsulate probiotics, which can improve the retention rate of probiotics, reduce the loss of probiotics during food processing and transportation, and thus retain the biological functions of probiotics to a maximum extent.