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Related Experiment Videos

Insect blood meal studies using radiosodium 24Na and 22Na

R M Knaus1, L D Foil, C J Issel

  • 1Nuclear Science Center, Louisiana State University, Baton Rouge 70803-5820.

Journal of the American Mosquito Control Association
|September 1, 1993
PubMed
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Researchers used radioactive sodium-24 (24Na) to measure blood volumes in insects and on medical equipment. This method accurately quantified blood feeding in tabanids and mosquitoes, and residual blood on needles.

Area of Science:

  • Nuclear Medicine
  • Medical Entomology
  • Biophysics

Background:

  • Accurate quantification of blood volumes is crucial in entomological and medical research.
  • Previous methods for measuring blood intake by insects or residual blood on medical tools have limitations.
  • Radiotracer techniques offer a sensitive approach for quantitative biological measurements.

Purpose of the Study:

  • To develop and validate a method using radioactive sodium-24 ([24Na]) for quantifying blood volumes.
  • To estimate blood meal sizes in various insect species, including tabanids and mosquitoes.
  • To determine the amount of blood residue on common medical instruments after needle-stick injuries.

Main Methods:

  • Rabbits were infused with a sodium carbonate solution containing radioactive sodium-24 ([24Na]).

Related Experiment Videos

  • Beta particle detection using a Tennelec Counting System quantified radioactivity in nanoliter blood samples.
  • Radioactivity measurements with a Packard Autogamma 5650 determined blood meal size in Aedes aegypti mosquitoes fed on a [24Na]-labeled artificial diet.

    • Main Results:

    • Blood volumes on the mouthparts of tabanids after interrupted feeding ranged from 6.12 to 12.5 nanoliters.
    • Blood adhering to 22-gauge needles and size 2 insect pins after needle-stick was estimated at 8.8 +/- 1.0 nl and 5.7 +/- 1.8 nl, respectively.
    • The average blood meal size for Aedes aegypti mosquitoes was determined to be 2.80 +/- 0.94 microliters.

    Conclusions:

    • Radioactive sodium-24 ([24Na]) is a reliable and sensitive radiotracer for quantifying small blood volumes.
    • The method provides accurate estimates of blood feeding in medically important insects.
    • This technique can assess blood contamination on medical devices, relevant for infection control and research.