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Small amounts of urea and guanidine hydrochloride can be detected by a far-UV spectrophotometric method in dialysed protein solutions
Miguel Angel Fuertes, José Manuel Pérez and Carlos Alonso
Journal of Biochemical and Biophysical Methods
Volume 59, Issue 3, 30 June 2004, Pages 209-216
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http://dx.doi.org/10.1016/j.jbbm.2004.02.001