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(a) Total ion chromatogram of Bliβ([3,2]Tpa9) extracted with n-butanol. (b) Mass spectrum of Bliβ([3,2]Tpa9) ([Mcalc + 2H]2+ = 1514.17, [Mcalc + 3H]3+ = 1009.78) with annotated fragment masses. (c) HR-ESI-MS2 analysis of wild type Bliβ ([M + 2H]2+ = 1511.18 Da) and congeneric Bli([3,2]Tpa9) ([M + 2H]2+ = 1514.17 Da). Characteristic mass shifts of 6 Da due to incorporation of [3,2]Tpa as a surrogate for Trp are indicated in red color.
