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Multistranded helix in xanthan polysaccharide

G Holzwarth, E B Prestridge

    Science (New York, N.Y.)
    |August 19, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Native xanthan gum forms a double-stranded fiber, but denaturation breaks it into single strands. Renaturation reveals short, twisted regions of multiple xanthan strands.

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    Area of Science:

    • Biochemistry
    • Materials Science
    • Microbiology

    Background:

    • Xanthan gum is a versatile microbial extracellular polysaccharide.
    • Its unique structural properties influence its functionality in various applications.
    • Understanding xanthan's molecular architecture is crucial for optimizing its use.

    Purpose of the Study:

    • To elucidate the native and denatured structural characteristics of xanthan gum.
    • To investigate the renaturation process and resulting fiber morphology.
    • To provide insights into the molecular basis of xanthan's physical properties.

    Main Methods:

    • Electron microscopy was employed to visualize xanthan structures.
    • Native xanthan samples were analyzed.
    • Denaturation and renaturation protocols were applied, followed by microscopic examination.

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    Main Results:

    • Native xanthan presents as an unbranched, likely double-stranded fiber (4 nm width, 2–10 µm length).
    • Denaturation reduces xanthan to single strands (2 nm width, 0.3–1.8 µm length).
    • Renatured xanthan exhibits short, unraveled regions with a right-handed twist of 2–3 strands.

    Conclusions:

    • Xanthan gum's structure is conformationally dynamic, transitioning between double and single strands.
    • The fiber width and length are significantly altered by denaturation and renaturation.
    • The observed structural changes provide a molecular explanation for xanthan's rheological behavior.