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Related Experiment Videos

Microstructure of Purified Rubber Particles.

Wood, Cornish

    International Journal of Plant Sciences
    |May 20, 2000
    PubMed
    Summary

    Rubber particles from four plant species were compared using electron microscopy. Differences in particle structure and membrane fluidity were observed, impacting preservation during fixation.

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    Area of Science:

    • Plant Biochemistry and Ultrastructure
    • Materials Science of Natural Polymers

    Background:

    • Natural rubber is sourced from various plant species, including Hevea brasiliensis, Parthenium argentatum, Ficus elastica, and Euphorbia lactiflua.
    • Understanding the ultrastructure and properties of rubber particles is crucial for optimizing rubber extraction and application.

    Purpose of the Study:

    • To compare the ultrastructure and membrane properties of purified rubber particles from four different plant species.
    • To evaluate the effects of different electron microscopy techniques and fixation methods on rubber particle preservation.

    Main Methods:

    • Purified rubber particles were examined using conventional scanning electron microscopy (SEM), field-emission SEM, cryo-SEM, and transmission electron microscopy (TEM).
    • Particles were subjected to various fixation protocols, including aldehyde fixation and aldehyde-osmium tetroxide fixation, with and without potassium permanganate staining.

    Main Results:

    • All rubber particles were spherical with a homogeneous rubber core and a monolayer membrane, varying in size.
    • Particles from Hevea brasiliensis and Parthenium argentatum showed more fluid surface components, deforming and fusing readily, unlike Ficus elastica and Euphorbia lactiflua.
    • Fixation methods differentially affected particle integrity; aldehyde fixation caused collapse in H. brasiliensis and P. argentatum, while F. elastica particles became hollow.

    Conclusions:

    • Significant differences exist in the structural integrity and membrane fluidity of rubber particles from different plant species.
    • The choice of fixation and staining techniques is critical for accurate ultrastructural analysis and preservation of rubber particles.
    • Hevea brasiliensis and Parthenium argentatum particles exhibit distinct properties compared to Ficus elastica and Euphorbia lactiflua, influencing their behavior during processing.

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