Gelling Citrus Fiber via Acid-Alkaline Modification
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Solution Overview
Problem
There is a need for pectin-containing cellulosic materials that can form strong gels, as existing pectin-based solutions are limited by methyl-esters attached to the polysaccharide backbone, restricting their thickening and gel-forming capabilities in aqueous solutions.
Innovation Solution
The modification of pectin-containing cellulosic materials, particularly from citrus peels, to create a gelling citrus fiber material with a defined degree of esterification and molecular weight, which forms strong gels in aqueous solutions, involves an acid wash and alkaline incubation process, with infrared spectroscopy used to monitor and control the modification reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pectin is extracted from citrus peels using acid and de-esterified by incubating in alkaline solution, then the pectin can be obtained and its native utility broadened, but the gel-forming capability is limited by methyl-esters attached to the polysaccharide backbone
Solution Approach 1:
The patent applies parameter changes by carefully controlling the degree of esterification (DE) within a specific range of 10-80%, molecular weight between 50-275 kDa, and pectin content of 40-50% galacturonic acid. These parameter optimizations enable the modified citrus fiber to form strong gels while maintaining versatility in various applications including food, industrial, and personal care uses.
2Strength
If the degree of esterification is reduced to improve gel strength, then the gel-forming capability increases, but the thickening ability may be affected
Solution Approach 1:
The patent resolves this contradiction by optimizing the degree of esterification to a specific range of 10-80%, which balances gel strength and thickening capability. This parameter optimization allows the modified citrus fiber to achieve both strong gel formation and effective thickening in aqueous solutions, satisfying multiple functional requirements simultaneously.
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 gelling citrus fiber material can produce gels with varying gel strengths, suitable for industrial, personal care, and food applications, offering improved texture modification capabilities compared to unmodified pectin solutions.
Implementation Method 1
The gelling citrus fiber material can form strong gels in aqueous solution
Implementation Method 2
methods to monitor changes in the infrared spectrum of the cellulosic material that happen during a modification reaction
Data Source
AI summary
The technology disclosed in this specification pertains to pectin containing cellulosic materials. The cellulosic material is modified so that it can form strong gels when dispersed in aqueous solution. Also disclosed are methods for modifying the cellulosic materials, including, at least in some embodiments, methods to monitor changes in the infrared spectrum of the cellulosic material that happen during a modification reaction to control the reaction and obtain end products capable of making gels having the desired gel strength.