Figure 1.

Naturally occurring naphthoquinone compounds are isolated from the lapacho tree (Tabebuia sp.). Nor-β-lapachone (NβL), a derivative prepared by the cyclization of nor-lapachol, was encapsulated in PLGA microcapsules by emulsification/solvent extraction. NβL-loaded PLGA microcapsules appear as a lyophilized orange powder, and SEM images (magnification ×5000) show the particle morphology.