Related Experiment Video
Updated: Feb 12, 2026

Analysis and Specification of Starch Granule Size Distributions
Published on: March 4, 2021
Preparation, characterization, digestibility and antioxidant activity of quercetin grafted Cynanchum auriculatum
Jun Liu1, Xingchi Wang1, Huimin Yong1
1College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China.
Abstract:
In this study, a novel method was developed to conjugate quercetin with Cynanchum auriculatum starch. Quercetin was first succinylized and then grafted onto C. auriculatum starch through a N,N'‑carbonyldiimidazole mediated reaction. The obtained water soluble quercetin grafted starch (quercetin-g-starch) was characterized by several instrumental methods. UV-vis spectrum of quercetin-g-starch aqueous solution exhibited two absorption bands at around 300 and 430nm. Fourier-transform infrared spectrum of quercetin-g-starch showed characteristic bands at 1731 and 1568cm-1, assigning to CO stretching of esterified carboxyl group and CC stretching of aromatic ring, respectively. Proton nuclear magnetic resonance spectrum of quercetin-g-starch showed partial proton signals of starch (3.30-5.47ppm) and quercetin (6.19-7.68ppm). All above results suggested quercetin was successfully grafted onto C. auriculatum starch. Besides, quercetin-g-starch particles were irregular in shape and were in an amorphous state. Notably, the thermal stability, resistant starch content as well as antioxidant activity of C. auriculatum starch was greatly enhanced by grafting with quercetin. This indicated the potential of quercetin-g-starch in the development of a novel resistant starch with antioxidant activity.
More Related Videos
10:03Comparative Study on the Polysaccharide Contents and Antioxidant Activities of Hippophae rhamnoides subsp. sinensis and Hippophae gyantsensis
Published on: August 15, 2025
08:41Functional Characterization of Regulatory Macrophages That Inhibit Graft-reactive Immunity
Published on: June 7, 2017
Related Concept Videos
Carbohydrate Digestion
What is Monogastric Digestion?
Protein Digestion
Lipid Digestion
Regulation of the Digestive System
The effectors in this regulation system are glands and smooth muscles. Activation of...
Other Disorders of Digestive System