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Related Experiment Videos

A hemagglutinating substance in chitin.

F A Whitmore1

  • 1Ohio Agricultural Research and Development Center, Ohio State University, Wooster 44691.

Biotechniques
|February 1, 1992
PubMed
Summary
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A native chitin agglutinin, composed of protein and poly-N-acetylglucosamine, can be unintentionally eluted from crab shell chitin using weak acid. This substance interferes with plant lectin purification using chitin affinity matrices.

Area of Science:

  • Biochemistry
  • Plant Science
  • Affinity Chromatography

Background:

  • Chitin derived from crustacean shells is a common affinity matrix for purifying plant lectins with affinity for poly-N-acetylglucosamine (poly-GlcNAc).
  • The purification process relies on agglutination assays to monitor lectin isolation.

Purpose of the Study:

  • To investigate the unintended elution of a substance during the isolation of a lectin from Pinus strobus L. (eastern white pine) ovules using chitin affinity chromatography.
  • To characterize the nature of the eluted substance and its implications for lectin purification.

Main Methods:

  • Washed chitin from crab shells was used as an affinity medium for lectin isolation.
  • Elution was performed using weak acid (0.05 N HCl or 0.1 N acetic acid) and 0.5 N NaOH.

Related Experiment Videos

  • Agglutination capacity of eluted substances was assessed.
  • Chitin samples from four biochemical suppliers were tested for the presence of the elutable agglutinin.

    • Main Results:

    • A potent red blood cell agglutinin was eluted from chitin using weak acid, but not with NaOH.
    • This chitin agglutinin is a complex of protein and poly-N-acetylglucosamine.
    • All tested chitin samples from commercial suppliers contained this elutable agglutinin, indicating it is a common contaminant.

    Conclusions:

    • The presence of a native chitin agglutinin in commercial chitin necessitates careful method development when using chitin as an affinity matrix for lectin purification.
    • Weak acid desorption steps can inadvertently release this agglutinin, potentially confounding purification results.
    • Researchers must implement strategies to avoid or remove this agglutinin to ensure accurate lectin isolation and characterization.