{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T12:58:27Z","timestamp":1790773107068,"version":"4.1.0"},"reference-count":40,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2020,3,10]],"date-time":"2020-03-10T00:00:00Z","timestamp":1583798400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Radiolysis of biomolecules by fast ions has interest in medical applications and astrobiology. The radiolysis of solid D-valine (0.2\u20132 \u03bcm thick) was performed at room temperature by 1.5 MeV H+, He+, N+, and 230 MeV S15+ ion beams. The samples were prepared by spraying\/dropping valine-water-ethanol solution on ZnSe substrate. Radiolysis was monitored by infrared spectroscopy (FTIR) through the evolution of the intensity of the valine infrared 2900, 1329, 1271, 948, and 716 cm\u22121 bands as a function of projectile fluence. At the end of sample irradiation, residues (tholins) presenting a brownish color are observed. The dependence of the apparent (sputtering + radiolysis) destruction cross section, \u03c3d, on the beam stopping power in valine is found to follow the power law \u03c3d = aSen, with n close to 1. Thus, \u03c3d is approximately proportional to the absorbed dose. Destruction rates due to the main galactic cosmic ray species are calculated, yielding a million year half-life for solid valine in space. Data obtained in this work aim a better understanding on the radioresistance of complex organic molecules and formation of radioproducts.<\/jats:p>","DOI":"10.3390\/ijms21051893","type":"journal-article","created":{"date-parts":[[2020,3,10]],"date-time":"2020-03-10T11:59:36Z","timestamp":1583841576000},"page":"1893","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Valine Radiolysis by H+, He+, N+, and S15+ MeV Ions"],"prefix":"10.3390","volume":"21","author":[{"given":"C\u00edntia A. P. da","family":"Costa","sequence":"first","affiliation":[{"name":"Physics Department, Pontif\u00edcia Universidade Cat\u00f3lica do Rio de Janeiro, Rua Marqu\u00eas de S\u00e3o Vicente 225, Rio de Janeiro 22451-900, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriel S. Vignoli","family":"Muniz","sequence":"additional","affiliation":[{"name":"Physics Institute, Universidade de S\u00e3o Paulo, Rua do Mat\u00e3o, Sao Paulo 1371\u201305508-090, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philippe","family":"Boduch","sequence":"additional","affiliation":[{"name":"Centre de Recherche sur les Ions; les Mat\u00e9riaux et la Photonique. Normandie Universit\u00e9, ENSICAEN, UNICAEN, CEA, CNRS, CIMAP, 14000 Caen, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hermann","family":"Rothard","sequence":"additional","affiliation":[{"name":"Centre de Recherche sur les Ions; les Mat\u00e9riaux et la Photonique. Normandie Universit\u00e9, ENSICAEN, UNICAEN, CEA, CNRS, CIMAP, 14000 Caen, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Enio F. da","family":"Silveira","sequence":"additional","affiliation":[{"name":"Physics Department, Pontif\u00edcia Universidade Cat\u00f3lica do Rio de Janeiro, Rua Marqu\u00eas de S\u00e3o Vicente 225, Rio de Janeiro 22451-900, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,3,10]]},"reference":[{"key":"ref_1","unstructured":"Marzzoco, A., and Torres, B.B. (2015). Bioqu\u00edmica B\u00e1sica, Guanabara Koogan. [4th ed.]."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"5579","DOI":"10.1016\/0016-7037(94)90251-8","article-title":"Isotopic analyses of nitrogenous compounds from the Murchison meteorite: Ammonia, amines, amino acids, and polar hydrocarbons","volume":"58","author":"Pizzarello","year":"1994","journal-title":"Geochim. Cosmochim. 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