Enzymatic Pectic Polysaccharide Modification for Ice Crystal Control
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Solution Overview
Problem
Natural pectin exhibits poor ice crystal growth inhibition due to neutral sugar branches causing steric hindrance and excessive ester groups affecting interaction, leading to quality issues in frozen and freeze-dried foods.
Innovation Solution
A method to modify pectin structure through enzymatic hydrolysis and de-esterification to enhance ice crystal growth inhibition, involving steps like enzymatic hydrolysis, vacuum filtration, and freeze-drying to produce a pectic polysaccharide with improved molecular structure for effective ice crystal regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural pectin is used as anti-freezing additive, then it is widely available and cost-effective, but it has poor ice crystal growth inhibition due to neutral sugar branches causing steric hindrance and excessive ester groups
Solution Approach 1:
The patent removes harmful neutral sugar branches and excessive ester groups from the pectin molecule through enzymatic hydrolysis and de-esterification processes, extracting only the essential galacturonic acid backbone that provides ice crystal growth inhibition activity
Solution Approach 2:
The patent systematically modifies pectin molecular structure parameters including molecular weight (reducing to 1.4-7.5 kDa), esterification degree (optimizing to 45-55%), and neutral sugar content (reducing to <5%) to achieve optimal ice crystal growth inhibition
2Reliability
If polysaccharide structure is modified through enzymatic hydrolysis and de-esterification, then ice crystal growth inhibition is significantly improved, but the preparation process becomes more complex and time-consuming
Solution Approach 1:
The patent divides the complex pectin modification process into distinct sequential steps: enzymatic hydrolysis to remove branches, vacuum filtration to separate components, de-esterification to remove ester groups, and freeze-drying to final purification, making each step manageable and controllable
Solution Approach 2:
The patent uses vacuum filtration as an intermediary separation method between enzymatic hydrolysis and de-esterification steps, and employs freeze-drying as an intermediary purification method, simplifying the overall process control and product purification
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 pectin polysaccharide significantly reduces ice crystal size, achieving up to 70.9% reduction compared to untreated pectin, demonstrating enhanced ice crystal inhibition efficacy.
Implementation Method 1
carrying out enzymolysis with α-amylase, protease, amyloglucosidase and cellulase
Implementation Method 2
enzymatic hydrolysis and de-esterification to enhance ice crystal growth inhibition
Implementation Method 3
the extracted natural polysaccharide has poor ice crystal inhibiting effect... there are too many neutral sugar branches, which form steric hindrance that is not beneficial to the adsorption of pectin to a surface of the ice crystal
Implementation Method 4
concentrating the apple solution enzymatic hydrolysate, and then carrying out the vacuum filtration
Implementation Method 5
vacuum concentration once under 40-60° C. and vacuum freeze-drying to obtain the pectic polysaccharide
Data Source
AI summary
The present disclosure provides a preparation method of a pectic polysaccharide capable of regulating and controlling ice crystal growth, comprising step 1, extracting a pectin crude extract from apple powder; step 2, carrying out branched chain enzymolysis on pectin crude extract to obtain pectin enzymatic hydrolysate; step 3, adding pectin methylesterase and pectin acetylesterase into pectin enzymatic hydrolysate for precise de-esterification enzymolysis; step 4, adding 0.5-2 U/mL of polygalacturonase into pectin enzymatic hydrolysate obtained in step 3, and hydrolyzing for 1.5-2.5 hours; and step 5, collecting precipitate in pectin enzymatic hydrolysate obtained in step 4 to obtain pectic polysaccharide. The pectic polysaccharide has a purity higher than 90%, a methyl esterification degree of 45-55%, an acetylation degree less than 2%, a neutral sugar content less than 5%, and an average molecular weight of 1.4-7.5 kDa, and obviously reduces an ice crystal size in a freezing process.