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Determination of amount of parthenolide (PTL) encapsulated in poly lactide co-glycolide (PLGA) nanoparticles. (A) UV-VIS spectra used to construct the standard curve (B), with concentrations of PTL of 1.6, 3.2, 6.25, 12.5, 25.0, and 50.0 µg/mL.
