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Area of Science:

  • Food Science
  • Biochemistry
  • Materials Science

Background:

  • Pectin is a crucial polysaccharide in food and pharmaceutical industries.
  • Understanding pectin's structural properties is key to optimizing its functionality.
  • Extraction conditions significantly impact pectin's characteristics.

Purpose of the Study:

  • To investigate the link between pectin extraction conditions and its structural attributes.
  • To explore how pectin's spatial conformation affects its gel properties.
  • To provide insights for improved pectin extraction and application.

Main Methods:

  • Extraction of pectin (CPPs) at varying pH levels (1.1-2.1).
  • Analysis of pectin structure using monosaccharide composition.
  • Characterization of conformation and gel properties via small-angle X-ray scattering (SAXS) and rheological analysis.

Main Results:

  • Increasing extraction pH (1.1-2.1) correlated with higher degree of esterification (DE) (39.02%-68.52%) and arabinose content in the Rhamnogalacturonan I (RG-I) domain (2.51%-15.12%).
  • Variations in DE and RG-I side chains influenced molecular weight (Mw) (449.37-1266.74 kDa).
  • Pectin with moderate DE and RG-I content exhibited an extended conformation, which enhanced molecular interactions during gelation and improved gel properties.

Conclusions:

  • Extraction pH is a critical factor controlling pectin's structural characteristics, including DE and RG-I content.
  • Pectin's spatial conformation, influenced by its structure, directly impacts its gelation behavior and overall gel properties.
  • This study establishes a clear relationship between pectin extraction parameters, structural features, conformation, and functional gel properties, offering a novel perspective for pectin utilization.