Investigation of Acid-Base Indicator Property of Plumbagin from Plumbago zeylanica Linn
UV spectra for plumbagin in different pH media. (a) Plumbagin in methanol. Absorption occurs at 265 nm (λmax) and 410 nm. (b) Plumbagin in acidified methanol. Absorption takes place at 248 nm (λmax) and 420 nm from hypsochromic shift. (c) Plumbagin in basified methanol. Absorption takes place at 275 nm (λmax) and 520 nm from bathochromic shift.
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