Abstract
The free radicals formed in powdered samples of polyamino acids by exposure to thermal hydrogen atoms generated in a radio-frequency discharge have been identified by their electron spin resonance hyperfine patterns. Some of these radicals have also been observed in γ-radiation studies. Perhaps they are caused by reaction with secondary hydrogen atoms which are indirectly produced from the sample by ionizing radiation. The spectra presented in the present paper on polyamino acids with aliphatic side groups and in an earlier paper on polyamino acids with conjugated side groups provide a catalogue of spectra with which future spectra of hydrogen-bombarded proteins can be compared for analysis of the site of reaction of the protein with hydrogen atoms. Knowledge of the site of reaction of the hydrogen atoms with the polyamino acids has provided information about their primary and secondary structure.
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