Photoionization of neutral alkylphenothiazines in positive, neutral, and negatively charged vesicles: effects of the addition of cholesterol and alkyl chain length

The photoionization of alkylphenothiazines in cationic dioctadecyldimethylammonium chloride (DODAC), neutral dipalmitoylphosphatidylcholine (DPPC), and anionic dihexadecylphosphate (DHP) vesicles of different surface charge, after addition of cholesterol, was studied by electron spin resonance (ESR) and electron spin echo modulation (ESEM) methods