Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Effect of Herbicide Paraquat on Electron Donor and Acceptor

제초제 Paraquat의 전자수용 및 방출에 대한 영향

  • Kim Mi-Lim (Faculty of Cuisine & Nutrition, Daegu Haany University) ;
  • Choi Kyung-Ho (Department of Food Science and Nutrition, Daegu Catholic University)
  • 김미림 (대구한의대학교 식품조리영양학부) ;
  • 최경호 (대구가톨릭대학교 식품영양학과)
  • Published : 2005.04.01
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Abstract

When paraquat was added to the bacterial membrane or mitochondrial suspension, the mixture turned dark blue, but the color was disappeared by aeration. The same phenomenon was seen when electrons were supplied to the paraquat. Blue color appeared from near the cathode, and then spreaded to whole transit system. Coloration was accelerated by addition of alkali, but the color was reduced by addition of acid or oxygen. Paraquat exhibited absorption at ultraviolet region by electron transfer at the concentrations as low as 1.0 mM which did not exert difficulty in showing color reaction. Paraquat caused the increase of the optical density at 340 nm by electron transit, and an aspect of that had a strong resemblance to NADH. The acute toxic action of paraquat seemes to depend on inhibition of energy metabolism cased by paraquat action of electron donor and acceptor.

Pparaquat의 전자수용 및 방출에 대한 작용을 검토한 결과는 다음과 같다. Rat mitocondria분산액에 paraquat를 첨가하였을 때 반응액이 청색으로 변색되었으며 Aluminium 박 또는 동전극을 장치한 photo cell중에서 paraquat에 전류를 통한 경우에도 음극에서부터 청색으로 변색되기 시작하여 660 nm에서 높은 홉광도를 나타내었다. 이 착색반응은 반응액에 산소를 첨가함으로서 탈색되었다. Paraquat에 $H^+$을 첨가하고 전류를 통한 결과 340 nm에서의 홉광도가 증가되었으며 경시적인 흡광도 증가의 모양은 $NAD^+$에 전류를 통한 경우와 거의 일치하였다. 이상의 결과로부터 paraquat가 전자를 수용 또는 방출할 수 있음이 확인되었고 이러한 paraquat의 작용이 생체내에 이화작용에서 생성되는 전자를 포획하고 산소에 직접 넘겨줌으로써 cytochrome 호흡쇄로의 단계별 전자전달계가 차단되어 급성독성을 일으키는 요인으로 추정된다.

Keywords

References

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