Chemical form of technetium in corn (Zea mays) and the gastrointestinal absorption of plant-incorporated Tc by laboratory rats

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The food chain availability of technetium incorporated into plant tissue, its chemical form in corn leaves, and the potential for gastrointestinal absorption of plant-incorporated technetium was investigated. Technetium-95m was incorporated into corn leaves via root uptake. Chemical fractionation of the /sup 95m/Tc in leaves showed that 60% was extractable with boiling ethanol and weak mineral acids. The remainder was associated with cell walls and was extractable by harsh chemical treatment. Gel permeation chromatography of the cytosol, indicated that 50% of the /sup 95m/Tc co-chromatographed with anionic pertechnetate; however, it was impossible to distinguish if this pure pertechnetate or technetium complexed ... continued below

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Pages: 21

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Garten, C.T. Jr.; Myttenaere, C.; Vandecasteele, C.M.; Kirchmann, R. & Van Bruwaene, R. January 1, 1984.

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The food chain availability of technetium incorporated into plant tissue, its chemical form in corn leaves, and the potential for gastrointestinal absorption of plant-incorporated technetium was investigated. Technetium-95m was incorporated into corn leaves via root uptake. Chemical fractionation of the /sup 95m/Tc in leaves showed that 60% was extractable with boiling ethanol and weak mineral acids. The remainder was associated with cell walls and was extractable by harsh chemical treatment. Gel permeation chromatography of the cytosol, indicated that 50% of the /sup 95m/Tc co-chromatographed with anionic pertechnetate; however, it was impossible to distinguish if this pure pertechnetate or technetium complexed with organic molecules. Technetium-95m was administered to laboratory rats in a single dose as: (1) intravenous injection of pertechnetate, (2) pertechnetate mixed with standard laboratory food, and (3) a meal containing /sup 95m/Tc biologically incorporated into corn leaves. High concentrations of /sup 95m/Tc were found in the thyroids, hair, kidneys, and liver of rats. Technetium rapidly disappeared from the liver, kidneys, and other tissues, but remained in the thyroids and hair. Urinary excretion of technetium decreased, and fecal excretion increased when technetium was fed to rats as a /sup 95m/Tc incorporated into corn leaves. The percent of the administered dose absorbed into thyroid gland and the kidneys was less when technetium was biologically incorporated into corn leaves than when pertechnetate was mixed with food. Biological incorporation of technetium into plants appears to reduce its potential for food chain transfer by decreasing its availability for gastrointestinal absorption. 5 references, 4 figures, 3 tables.

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Pages: 21

Notes

NTIS, PC A02/MF A01.

Source

  • Scientific seminar on the behavior of technetium in the environment, Cadarache, France, 23 Oct 1984

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  • Other: DE85002319
  • Report No.: CONF-8410157-3
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 6312023
  • Archival Resource Key: ark:/67531/metadc1210314

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  • January 1, 1984

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Oct. 18, 2018, 12:38 p.m.

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Garten, C.T. Jr.; Myttenaere, C.; Vandecasteele, C.M.; Kirchmann, R. & Van Bruwaene, R. Chemical form of technetium in corn (Zea mays) and the gastrointestinal absorption of plant-incorporated Tc by laboratory rats, article, January 1, 1984; United States. (digital.library.unt.edu/ark:/67531/metadc1210314/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.