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Acidity and Basicity of Alcohols and Phenols

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Comparative Study on the Polysaccharide Contents and Antioxidant Activities of Hippophae rhamnoides subsp. sinensis and Hippophae gyantsensis

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Comprehensive characterization of lotus root polysaccharide-phenol complexes.

Yang Yi¹, Hao-Su Tang¹, Ying Sun¹

¹College of Food Science & Engineering, Wuhan Polytechnic University, Wuhan 430023, PR China.

|August 6, 2021

Summary

Phenolic binding enhances lotus root polysaccharides (LRPs) structure and activity. These complexes show improved antioxidant and immune-stimulating effects, offering a novel approach for LRPs functional improvement.

Keywords:

Interaction Lotus root Phenolic compound Polysaccharide

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Area of Science:

Food Science and Technology
Biochemistry
Materials Science

Background:

Lotus root polysaccharides (LRPs) are natural compounds with potential bioactivities.
Modifying LRPs can enhance their functional properties for various applications.
Phenolic compounds are known for their antioxidant and bioactive properties.

Purpose of the Study:

To investigate the impact of noncovalent phenolic binding on LRP structure and activity.
To prepare and characterize LRP-phenol complexes with different phenolic acids.
To evaluate the changes in antioxidant and immunomodulatory effects of LRPs after phenolic binding.

Main Methods:

Preparation of five LRP-phenol complexes using noncovalent intermolecular interactions.
Characterization of interactions using ultraviolet-visible and Fourier-transform infrared spectroscopy.
Analysis of molecular weight distribution, aggregation behavior, antioxidant activity, and macrophage-stimulating effects.

Main Results:

Phenolic binding significantly altered LRP molecular weight distribution and aggregation, increasing average MW by 3.73-8.30 times.
All LRP-phenol complexes exhibited enhanced antioxidant activities compared to native LRPs.
Catechin-bound LRPs notably improved macrophage stimulation, modulating nitric oxide (NO) production.

Conclusions:

Noncovalent interaction with phenolic compounds is an effective strategy to modify LRPs.
Phenolic binding improves the structural characteristics and bioactivities of LRPs.
This approach holds promise for developing enhanced functional ingredients from LRPs.