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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Anal Chem. 2011 Apr 5;83(9):3252–3255. doi: 10.1021/ac200439k

Figure 2.

Figure 2

(a) Positive nESI mass spectrum of a precipitated plasma solution spiked with 100 µM histidine. (b) negative ion spectrum obtained after ion/ion reaction with generation 1.5 [PAMAM-6H]6− reagent anions. The peak indicated with an asterisk (*) arises from n-benzenesulfonamide.