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To illustrate the potential of this technique for <jats:italic>in vivo<\/jats:italic> purposes, the authors took advantage of the oral administration of nitroxides to monitor the pH value inside the stomach of mice after administration of different antacidics. The results indicate that EPR can be a valuable tool to characterize the pH <jats:italic>in vivo<\/jats:italic> in a continuous and noninvasive way.<\/jats:p>","DOI":"10.1002\/mrm.1910360507","type":"journal-article","created":{"date-parts":[[2007,3,12]],"date-time":"2007-03-12T08:33:49Z","timestamp":1173688429000},"page":"694-697","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":75,"title":["Noninvasive measurement of the pH inside the gut by using pH\u2010sensitive nitroxides. 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