Changes in the Radiation Sensitivity of Some Enzymes and the Possibility of Protection against the Direct Action of Ionizing Particles

The variation of the sensitivity for inactivation by ionizing radiation of vacuum-dried invertase was investigated. It was found that different purification methods lead to different radiation sensitivities. In some preparations the addition of cysteine, glutathione, or yeast extract can lead to a reduced sensitivity. A possible mechanism for this protection effect is discussed. (auth)