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Pectic polysaccharides of black radish taproots: Extraction, structural characterization.

F V Vityazev1, V V Golovchenko1, O A Patova1

  • 1Institute of Physiology of Federal Research Centre "Komi Science Centre of the Urals Branch of the Russian Academy of Sciences", 50 Pervomaiskaya Str., 167982 Syktyvkar, Russia.

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Summary

Black radish taproots contain significant amounts of pectin, a key polysaccharide. Researchers isolated pectin and starch, finding pectin to be the primary component in both pulp and peel.

Keywords:
NMR spectroscopyPectinRaphanus sativus var. niger (L.) J. KernRhamnogalacturonan-IStarch

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Area of Science:

  • Plant Biochemistry
  • Food Science
  • Carbohydrate Chemistry

Background:

  • Black radish (Raphanus sativus L.) taproots are a source of polysaccharides.
  • Understanding the composition of these polysaccharides is important for potential applications.

Purpose of the Study:

  • To isolate and characterize starch and pectin from black radish taproot pulp and peel.
  • To determine the yield and structural features of the extracted pectins.

Main Methods:

  • Sequential extraction using various solvents (water, ammonium oxalate, sodium carbonate, sodium hydroxide).
  • Enzymatic degradation with amyloglucosidase and polygalacturonase.
  • Fractionation using DEAE-cellulose and structural analysis via NMR spectroscopy.

Main Results:

  • Ammonium oxalate solutions yielded the highest amounts of polysaccharides from both pulp and peel.
  • Pectin was identified as the main polysaccharide, with yields of 9.5% (pulp) and 10.5% (peel) on dry matter.
  • NMR analysis revealed the presence of rhamnogalacturonan-I (RG-I) and galacturonan (HG) regions in the pectin structure, with RG-I exhibiting an unbranched structure.

Conclusions:

  • Black radish taproots are a rich source of pectin, with higher concentrations in the peel.
  • The isolated pectin contains distinct RG-I and HG regions, with RG-I being unbranched.
  • These findings contribute to the understanding of black radish composition and pectin characterization.