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(a) Flow injection analysis of Angiotensin I (MW = 1295.6 Da) through the combination cells into nESI-MS without microwave heating and no voltage applied. (b) Only microwave heating (130°C), no voltage. (c) voltage applied (+1.5V) but no microwave heating, and (d) Microwave heating (130°C) and voltage applied (+1.5V).
