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- Newsgroups: sci.chem
- Path: sparky!uunet!mcsun!news.funet.fi!network.jyu.fi!eloranta
- From: eloranta@jyu.fi (Jussi Eloranta)
- Subject: Re: hydrogen peroxide decomposition in human tissues
- Message-ID: <1992Nov23.163724.11880@jyu.fi>
- Organization: University of Jyvaskyla, Finland
- References: <1992Nov23.151907.26488@athena.cs.uga.edu>
- Date: Mon, 23 Nov 1992 16:37:24 GMT
- Lines: 31
-
- In article <1992Nov23.151907.26488@athena.cs.uga.edu> giber@pollux.cs.uga.edu (Carolyn Giberson) writes:
- >
- >Human tissues contain an enzyme (catalase) which does indeed decompose
- >hydrogen peroxide. Potatoes have a similar enzyme. We use that
- >potato enzyme in a lab on enzyme activity which I would be glad to
- >post if there is interest.
- >
-
- I've been reading some studies on anti cancer medicines (semiquinones = dokso-
- rubisin etc.) lately. Many of the articles state that hydroxyl radicals
- are causing damage to tissues. And these hydroxyl radicals come from
- decomposition of hydrogen peroxide. Hydroxyl radicals are very reactive
- and can cause DNA damage etc. [hydroxyl radicals were detected with "spin
- trapping" & EPR]
-
-
- Jussi
-
- ps. The semiquinone hydroxyl radical generation can go something like:
-
- SQ -> SQ- (semiquinone radical)
- SQ- + O2 -> SQ + O2- (radical)
- O2- + O2- + 2H+ -> H2O2 + O2
- H2O2 + Fe2+ -> Fe3+ + OH. + OH-
-
-
- --
- ============================================================================
- Jussi Eloranta Internet(/Bitnet): ! The ultimate trip is
- University of Jyvaskyla, Jussi.Eloranta@jyu.fi ! death.
- Finland [130.234.0.1] ! -- Jim Morrison
-