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Each amide proton CEST intensity was recorded on 20 mM samples at 9.4 T, 310 K and the indicated pH after application of a frequency-selection presaturation pulse set to the frequency of the exchanging –NH proton characteristic of each complex (B1 = 21.2 µT, presaturation time = 4 s (YbDOTA-(gly)4 −) or 2 s (TmDOTA-(gly)4 −, TbDOTA-(gly)4 −, DyDOTA-(gly)4 −).
