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Nanosponge Tunability in Size and Crosslinking Density
Published on: August 4, 2017
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New insight in crosslinking degree determination for crosslinked starch
1College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China; Guangdong Province Key Laboratory of Green Processing of National Products and Product Safety, Guangzhou 510640, China.
Carbohydrate Research
|February 12, 2018
Summary
A new starch-iodine (St-I) method effectively characterizes crosslinking degree in modified starches. This St-I approach offers a versatile alternative to traditional methods for analyzing both low and high levels of starch crosslinking.
Area of Science:
- Materials Science
- Polymer Chemistry
- Carbohydrate Chemistry
Background:
- Characterizing the degree of substitution in crosslinked starches, especially at very low and very high levels, presents significant challenges.
- Existing methods like viscosity, settling volume, and phosphorus content analysis have limitations, including scope, environmental impact, and inability to reflect internal structural changes.
Purpose of the Study:
- To introduce and validate the starch-iodine (St-I) method as a novel approach for characterizing the crosslinking degree in modified starches.
- To evaluate the St-I method's efficacy across a wide range of crosslinking reagent concentrations (0.01% to 10%) and different starch crystalline patterns (A, B, and C).
Main Methods:
- Investigated three distinct starch crystalline patterns (A, B, C) modified with varying concentrations of a crosslinking reagent.
- Applied the starch-iodine (St-I) method, based on the complex formation between starch components (amylose and amylopectin) and iodine, to assess crosslinking.
- Compared the St-I method's performance with traditional techniques, particularly at low and high crosslinking levels.
Main Results:
- The St-I method successfully characterized crosslinking in all tested modified starches across the entire range of reagent concentrations.
- At low crosslinking levels (0.01-0.1%), the St-I method indicated a rapid decrease in accessible amylose, demonstrating its utility as a replacement for viscosity measurements.
- At high crosslinking levels (1-10%), significant differences were still observable via St-I, though less pronounced than at lower levels; 'dose efficiency' was introduced to characterize this phenomenon.
Conclusions:
- The starch-iodine method provides a robust and versatile tool for quantifying the degree of crosslinking in modified starches, overcoming limitations of conventional techniques.
- The St-I method is particularly effective for analyzing low levels of crosslinking and offers valuable insights into high crosslinking modifications through the concept of dose efficiency.
- This study establishes the St-I method as a reliable and informative approach for evaluating starch modification processes.
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