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Efficient and Selective Extraction of Rhamnogalacturonan-I-Enriched Pectic Polysaccharides from Tartary Buckwheat

Ding-Tao Wu1, Jing Lei1, Jie Li1

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Summary

New extraction methods efficiently isolate valuable pectic polysaccharides from Tartary buckwheat green leaves. These techniques enhance antioxidant and immunostimulatory properties, unlocking potential for functional food ingredients.

Keywords:
Tartary buckwheatbiological activitydeep eutectic solventhigh-pressure processingrhamnogalacturonan-I-enriched pectic polysaccharide

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Area of Science:

  • Food Science
  • Biochemistry
  • Green Chemistry

Background:

  • Tartary buckwheat green leaves are a rich source of pectic polysaccharides.
  • Current applications of these polysaccharides in the food industry are limited.
  • Efficient extraction methods are needed to utilize this valuable by-product.

Purpose of the Study:

  • To explore deep-eutectic-solvent-assisted extraction (DESE) and high-pressure-assisted deep eutectic solvent extraction (HPDEE) for pectic polysaccharide extraction.
  • To investigate the impact of these methods on the structural properties and bioactivity of extracted pectic polysaccharides.
  • To promote the use of Tartary buckwheat green leaves as a source of functional food ingredients.

Main Methods:

  • Deep-eutectic-solvent-assisted extraction (DESE) was employed.
  • High-pressure-assisted deep eutectic solvent extraction (HPDEE) was utilized.
  • Structural properties and bioactivities (antioxidant, anti-glycosylation, immunostimulatory) of extracted pectic polysaccharides were analyzed.

Main Results:

  • Both DESE and HPDEE significantly improved extraction efficiency and selectively enriched rhamnogalacturonan-I (RG-I) in pectic polysaccharides.
  • Extraction methods enhanced antioxidant and anti-glycosylation effects by altering free uronic acids, bound polyphenolics, and molecular weight.
  • HPDEE and DESE partially intensified immunostimulatory effects, linked to increased RG-I content.

Conclusions:

  • DES-based extraction techniques, particularly HPDEE, are effective for selective extraction of RG-I-enriched pectic polysaccharides from Tartary buckwheat green leaves.
  • These methods enhance the functional properties of pectic polysaccharides, making them suitable for food applications.
  • The study highlights the potential of Tartary buckwheat green leaves as a source for novel functional food ingredients.