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Liquid chromatography–electrospray ionization–mass spectrometry (LC–ESI–MS) and liquid chromatography–tandem mass spectrometry (LC–MS/MS) methods were developed to simultaneously determine the concentrations of angiotensin (Ang) II, Ang 1-7, Ang III, and Ang IV in biological samples. The samples were extracted with C18 solid-phase extraction cartridges and separated by a reverse-phase C18 column using...
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