PubMed · 6863637
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C Camisa, W Roberts. 1983. Monsel solution tattooing.. https://doi.org/10.1016/s0190-9622(83)80231-x
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Ninhydrin-ferric reagent reacts highly and specifically with lysine at a pH value of 1.0. Ferric ion inhibits the reaction of ninhydrin with proline, ornithine, glycine, arginine, and histidine. This method can be used to determine a lysine sample of high concentration without dilution. It has a linear response range from 0.0625 to 0.5 mg lysine.HCl.
Two well-known chemical systems, the Fricke (system I) and the Fricke + ethanol (system II), were irradiated with intermediate-energy 12C and 40Ca ion beams. A vertical beam allowed us to study radiation phenomena in the bulk of a stirred solution and in the motionless surface layer in contact with air. The G value of the formation of Fe3+ in system II compared to system I allowed us to distinguish between oxygenated and hypoxic conditions in the reaction zone, i.e., in our case, in the vicinity of the heavy-ion path. Our results for nonstirred solutions that are open to air indicate an oxygen deficiency in the reaction zones even for medium-intensity ion fluences. The origin of this effect is not completely clear at present. Nevertheless, it is evident that postulated mechanisms for the generation of O2 in heavy-ion tracks are not sufficient to keep an oxygenated condition in nonstirred solutions. We cannot exclude the possibility that the low oxygen enhancement ratio observed in experiments with high-LET radiation may arise, at least partly, from an insufficiency rather than an excess of oxygen.
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