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Ribbon-like structures result when amphotericin B interacts with lipid in an aqueous environment. At high ratios of amphotericin to lipid these structures, which are lipid-stabilized amphotericin aggregates, become prevalent resulting in a dramatic attenuation of amphotericin-mediated mammalian cell, but not fungal cell, toxicity. Studies utilizing freeze-etch electron microscopy, differential scanning calorimetry, 31P NMR, x-ray diffraction, and optical spectroscopy revealed that this toxicity attenuation is related to the macromolecular structure of the complexes in a definable fashion. It is likely that amphotericin in this specific form will have a much improved therapeutic utility.

Unusual lipid structures selectively reduce the toxicity of amphotericin B.