Fig. 3From: Spectroscopic determination of alkyl resorcinol concentration in hydroxyapatite compositeUV-Vis absorption spectra of the 4HR (a) and the 4HR-loaded HA composite powder (b). Inset of a is the absorption coefficients of 4HR as a function of concentration. Inset of b is the absorption spectrum of the HA powder aqueous mixture (5 mg/ml)Back to article page