Fig. 2.

Raman spectra of common Type I adulterants compared to EBN. A EBN from Kuantan (black line), B Fish bladder (red line), C Pork skin (orange line), D Karaya gum (green line), E Coralline seaweed (blue line), F Japanese agar (purple line), G Tremella fungus (brown line). Sample A is a glycoprotein; Samples B and C are collagens, i.e. proteins; while Samples D–G are largely polysaccharides (color figure online)