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Wood Toxicity & Human Response. Marian McGee June 14, 2011 Valley Woodturners. Key Concepts. Structural Components Accessory Components Bioresponse Protection & Control. Structural Components. Cellulose used for paper production long, string like molecule high tensile strength

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Wood toxicity human response

Wood Toxicity&Human Response

Marian McGee

June 14, 2011

Valley Woodturners


Key concepts
Key Concepts

  • Structural Components

  • Accessory Components

  • Bioresponse

  • Protection & Control


Structural components
Structural Components

  • Cellulose

    • used for paper production

    • long, string like molecule

    • high tensile strength

  • Hemicellulose

    • less complex branch

    • likes to link lignin and cellulose

  • Lignin

    • most complex

    • responsible for the strength and rigidity of the substance

    • classifiable

      • Hardwoods

      • Softwoods

      • grasses


Accessory substances extractives
Accessory Substances/Extractives

  • Fats, resins, oils, waxes

  • Proteins, gums, latex, mucus, starch & sugars

  • Alkaloids, dyes, tannins, glycosides camphor, perfumes

  • Inorganic and organic salts and acids

  • Minerals(e.g. calcium, potassium, sodium, etc.)


Quinones
Quinones

  • Chemicals in the wood’s lignin, hemicellulose and cellulose

    • designed as a defense against fungus and other predators (including woodturners)

    • particular to a species and probably to related species


Bioresponse
Bioresponse

  • Skin/dermis

  • Respiratory system

  • Cardiovascular system

  • Neurological system

  • Endocrine system



Allergic reaction
Allergic Reaction

  • Phase 1

    • penetrates the white blood cells in the epidermis

    • travels to lymph nodes where T cells may or may not recognize the “invader”


Bioresponse phase
Bioresponse Phase

  • Reaction

    • the T cells release a protein which will attract white blood cells to fight and destroy everything close by

      • (including skin cells – rash & blisters)

  • may also manifest redness

    • (vasodilation) & itching (neurological response)

  • Anaphylaxis – rapid physical ‘shutdown’ and ****!!!!!

  • initially undetected physical response****!!!!


  • Outcomes consequences
    Outcomes/Consequences

    • Possible:

      • headaches

      • bronchitis, rhinitis

      • sinusitis

      • dermatitis

      • cancers

        • nasal,

        • throat,

        • lungs,

        • skin,

        • endocrine


    Critical equation
    Critical Equation!!!

    Element(s) of the wood

    +

    Dosage

    (i.e. the length of exposure & the number of undesirable molecules)

    +

    Strength/Power

    (of the wood molecules)

    +

    Vulnerability

    (of the person)

    =

    Your Level of Risk


    Protection control
    Protection & Control

    • Understand

      • the profile of your wood – its growth site, potency

    • Learn

      • your personal vulnerabilities/sensitivities – skin, respiratory, gastro intestinal, eyes, etc.

    • Take

      • appropriate protective action

        • e.g.

          • Full respiratory protection & dust control

          • Hand washing and well fitted gloves

          • Workshop clothes and face shield


    References
    References

    • Woods Toxic to Man – author unknown

    • Vancouver Woodturners Guild

    • Meir, Eric – Wood Allergies and Toxicity

    • BMEzine Encyclopaedia – Wood Hazards

    • Wood Toxicity Table – Toxic Woods Information Sheet #30

    • www.wood-database.com/wood-articles/wood-allergies-and-toxicity/


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