This work presents the characterization of selected bioactive compounds of local herbs
through their photonic spectrum. A Shimadzu spectrophotometer was used to map bioactive
compounds extracted from Andrographis paniculata, Ficus deltoidea, Orthosiphon stamineus
and Centella asiatica. Dominant peaks and repeatability were the determinant parameters
in this study. Absorbance peaks of bioactive compounds were calibrated against respective
standardized chemicals obtained from reputable suppliers. The results obtained indicated
that absorbance peaks from different bioactive compounds could be identified by photonic
spectrum. Most bioactive markers were detected within the wavelength range of 200 nm to 350
nm, using a Deuterium (190 nm to 450 nm) light source and corresponding refraction grating.
A mathematical relationship of concentration versus absorbance at different wavelengths for
selected bioactive compounds were identified. The significance of the photonic characterization
of these phytochemicals forms the basis for a mathematical model in a decision support system
of a proposed mobile sensor prototype development.