Modified Starch Enzymatic Preparation for Resistant Content
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Solution Overview
Problem
Current methods for preparing resistant starch (RS) face challenges such as environmental pollution, low yield, and limited RS content, which are not suitable for industrial production or safe for diabetic patients due to gastrointestinal side effects from chemical inhibitors.
Innovation Solution
A method involving the sequential addition of β-amylase, branching enzyme, and pullulanase to gelatinized starch, followed by precipitation and drying, to modify the starch structure and significantly increase RS content, resulting in a modified starch that can be used in hypoglycemic foods or medicaments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical inhibitors are used to control hyperglycemia, then glycemic control is improved, but gastrointestinal side effects occur
Solution Approach 1:
The patent uses modified starch as a natural, biodegradable alternative to chemical inhibitors. The modified starch structure is designed to be temporarily active in the gastrointestinal tract, providing glycemic control only when needed, then being naturally degraded and excreted without long-term accumulation or persistent side effects.
Solution Approach 2:
The patent modifies the physical and chemical parameters of starch through enzymatic treatment (using beta-amylase, branching enzyme, and pullulanase) to create a specific molecular structure with increased resistant starch content and altered chain length distribution. This structural modification changes how the starch interacts with digestive enzymes, providing glycemic control without the harmful effects of chemical inhibitors.
2Quantity of substance
If acidolysis process is used to prepare resistant starch, then RS content is improved, but environmental pollution occurs
Solution Approach 1:
The patent replaces the chemical acidolysis process with an enzymatic system. Instead of using strong acids and bases to modify starch, the invention uses biological enzymes (beta-amylase, branching enzyme, pullulanase) that work under mild conditions, producing no harmful waste products and eliminating environmental pollution associated with chemical reagents.
Solution Approach 2:
The patent introduces enzymes as intermediary substances to mediate the modification of starch. These enzymes act as catalysts that facilitate the structural changes needed to increase resistant starch content without requiring harsh chemical conditions, thereby avoiding environmental pollution while achieving the desired RS content.
3Ease of manufacture
If autoclave process is used to prepare resistant starch, then processing is simplified, but yield is reduced
Solution Approach 1:
The patent employs a continuous multi-enzyme process where beta-amylase, branching enzyme, and pullulanase work in sequence to progressively modify the starch structure. This continuous enzymatic action maintains high reaction efficiency throughout the process, preventing the yield loss that occurs in single-step autoclave processing while keeping the manufacturing process relatively simple.
Solution Approach 2:
The patent optimizes reaction parameters (temperature, pH, enzyme concentration, reaction time) for each enzymatic step to maximize yield. By carefully controlling these parameters, the process achieves high resistant starch content while maintaining simplicity and avoiding the yield reduction associated with autoclave processing.
4Ease of manufacture
If enzymolysis process with pullulanase is used to prepare resistant starch, then processing is simplified, but yield and RS content are reduced
Solution Approach 1:
The patent divides the starch modification process into three distinct enzymatic stages: first beta-amylase removes maltose units to shorten external chains, then branching enzyme creates new branch points, and finally pullulanase hydrolyzes branched chains. This segmentation of the modification process allows each enzyme to perform its specific function optimally, resulting in higher yield and RS content compared to using pullulanase alone.
Solution Approach 2:
The patent applies preliminary enzymatic treatments (beta-amylase and branching enzyme) before the final pullulanase treatment. These preliminary actions prepare the starch structure by shortening chains and creating specific branch patterns, which then enable the pullulanase to more effectively produce the desired resistant starch structure with higher yield and 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 modified starch increases RS content, reduces glycemic index, lowers cholesterol levels, and regulates body weight and blood lipid, providing an effective hypoglycemic effect without causing gastrointestinal adverse reactions, and is suitable for industrial production.
Implementation Method 1
α-1,4-glycosidic bonds are hydrolyzed with β-amylase to remove maltose units consecutively from non-reducing terminals of a starch chain
Implementation Method 2
branching enzyme transfers linear chains of the starch to amylose or amylopectin through α-1,6-glycosidic bonds, forming more new branch points
Implementation Method 3
pullulanase hydrolyzes all the above branched chains in the starch through α-1,6-glycosidic bonds to obtain degree of polymerization (DP) 6-11 linear chains
Implementation Method 4
precipitating a resulting enzymatic hydrolysate with an alcohol to obtain precipitates
Implementation Method 5
drying the precipitates to obtain the modified starch
Data Source
AI summary
Disclosed herein are methods for preparing modified starches, and uses thereof, and relates to the technical field of starch preparation; modifying a gelatinized starch suspension with β-amylase; after inactivating the β-amylase, further modifying with a branching enzyme, after inactivating the branching enzyme, further modifying with pullulanase, after inactivating the pullulanase, precipitating a resulting enzymatic hydrolysate with an alcohol to obtain precipitates; and drying the precipitates to obtain the modified starch. The methods disclosed a starch is modified remarkably, herein substantially increase the number of linear chains with a degree of polymerization DP6-11 in the starch chains and, thus, significantly increase the content of resistant starch in the modified starch—thereby facilitating the use in foods and medicaments.