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A multi-glycomic tool for characterization of resistant starch.
Sophia Jiang1, Carlito B Lebrilla2
1Department of Chemistry, University of California Davis, Davis, CA 95616, USA.
Carbohydrate Polymers
|May 1, 2026
Summary
Resistant starch (RS) resists digestion, benefiting gut health. This study reveals RS structure using enzymatic assays and LC-MS, identifying key glycosidic linkage ratios linked to high RS content in foods.
Area of Science:
- Food Science
- Biochemistry
- Nutritional Science
Background:
- Resistant starch (RS) offers health benefits through colonic fermentation.
- The specific chemical structures conferring RS digestion resistance are not fully understood.
- Understanding RS structure is crucial for optimizing its health impacts.
Purpose of the Study:
- To elucidate the chemical structure of resistant starch (RS).
- To develop and apply a method for analyzing RS structure in foods.
- To correlate structural features with RS content.
Main Methods:
- Coupling an enzymatic starch digestion assay with liquid chromatography-mass spectrometry (LC-MS).
- Glycosidic linkage profiling of isolated RS.
- Calculation of ratios representing starch chain length and branching frequency.
Main Results:
- High RS content correlates with high (4-Glc)/(T-Glc) ratio and low (4,6-Glc)/(4-Glc) ratio.
- α-limit dextrin production post-digestion indicates starch resistance.
- Many staple foods have amylopectin-like structures with low RS; whole grains show diverse structures influencing digestion.
Conclusions:
- The developed LC-MS method effectively characterizes RS structure.
- Specific glycosidic linkage patterns define RS.
- Food processing and composition significantly impact RS content and digestibility.
