Figure 2From: Bio-fabrication of gold nanoparticles using aqueous extract of red tomato and its use as a colorimetric sensorUV–VIS absorption spectra of GNP at different compositions of tomato extract and SDS capped GNP in alkaline medium. UV-VIS spectra of (A) GNP at different compositions and (B) SDS-capped GNP. Insets are digital photographic images of A and B.Back to article page