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Fig. 5 | SpringerPlus

Fig. 5

From: Fabrication and vibration characterization of curcumin extracted from turmeric (Curcuma longa) rhizomes of the northern Vietnam

Fig. 5

Absorption spectra of curcumin—ethanol solutions with different curcumin concentration from 1, 2.5, 5, 10 μg and 20 μg/mL. The curcumin solution shows absorbance at λ = 425 nm and linear increasing absorption at peak 425 nm when the curcumin concentration increased. The inset is linear relation of the absorption intensity and curcumin concentration in this concentration range

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