Starch Hydrolysate Retrogradation Control via Enzyme Segmentation
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Solution Overview
Problem
Starch hydrolysates produced using conventional alpha-amylases exhibit rapid retrogradation, leading to instability and inhomogeneity, particularly in those with a Dextrose Equivalent (DE) of 30 or less, which complicates their use in food and pharmaceutical applications.
Innovation Solution
A process involving an alpha-amylase enzyme chosen from polypeptides encoded by a specific nucleotide sequence, such as Enzyme V, is used to produce a starch hydrolyzate with a unique carbohydrate profile, characterized by specific ranges of saccharides with degrees of polymerization, which inhibits retrogradation and maintains a neutral taste and low viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional alpha-amylases are used to produce starch hydrolysate, then the hydrolysis process is simple and cost-effective, but the hydrolysate exhibits rapid retrogradation leading to instability and inhomogeneity
Solution Approach 1:
The hydrolysis process is divided into two distinct stages: liquefaction using Enzyme V to control high molecular weight saccharides, and saccharification using additional enzymes to achieve final glucose content. This segmentation allows independent optimization of each stage to prevent retrogradation while maintaining process feasibility
Solution Approach 2:
The patent modifies key process parameters including using Enzyme V at specific activities (5-20 CU/g starch), controlling liquefaction temperature (85-105°C), and adjusting saccharification conditions (pH 4.0-6.0, 60-80°C). These parameter changes create a hydrolysate with specific carbohydrate profile that resists retrogradation
2Quantity of substance
If hydrolysis is stopped after liquefaction to obtain maltodextrins, then the sugar content is low, but the retrogradation behavior is poor and the product is more viscous
Solution Approach 1:
The patent performs partial saccharification rather than complete hydrolysis, stopping when glucose content reaches 20-50% rather than 100%. This partial action achieves a balance between sugar content and retrogradation resistance by maintaining some oligosaccharides (DP3-11 at 30-60%) that prevent crystallization while providing sufficient glucose for sweetness and functionality
3Object-affected harmful factors
If complete saccharification is performed to obtain high glucose syrup, then the sweetness is high, but the viscosity increases and retrogradation behavior deteriorates
Solution Approach 1:
The patent controls the DE value to range from 15 to 30 through adjusted saccharification parameters, rather than allowing complete hydrolysis to DE >50. This parameter control ensures glucose content provides sufficient sweetness while limiting excessive viscosity and retrogradation by maintaining a balanced carbohydrate profile with controlled oligosaccharide content
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 resulting hydrolyzate exhibits improved retrogradation behavior, maintaining stability and a neutral taste, while being easily handled and used in food and pharmaceutical products, with a carbohydrate profile that differs significantly from conventional hydrolysates of similar DE.
Implementation Method 1
starch being broken down by heating and hydrolyzed in the presence of acid, enzyme or a mixture of acid and enzyme, to transform the starch into carbohydrates of lower molecular weight
Implementation Method 2
conversion of starch is carried out by a first hydrolysis step, commonly called 'liquefaction'... followed by a second hydrolysis step, commonly called 'saccharification'
Data Source
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AI summary
The invention relates to a starch hydrolysate having a Dextrose Equivalent DE of between 5 and 30 and a specific carbohydrate profile. In particular, the hydrolysate of the invention has improved retrogradation behaviour. The invention also relates to a method for the production of said starch hydrolysate.