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Oligosaccharide sensitivity. A dilution series of spraycoated maltoheptaose on glass slide was analyzed by (A) MALDI- 2-MS in negative ion mode, (B) MALDI-MS in negative ion mode, and (C) MALDI-MS in positive ion mode. The bars show the mean intensity of the performed experiments (n = 5). Asterisks (*) highlight the lower limit of detection (signal-to-noise ratio (SNR) ≥ 3), and error bars represent the SEM.
