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(a) FTIR spectra of gelatin, agar-agar and Pectigel (pectin-containing food-grade additive) and (b) of the various synthesized powders. Some of the spectra are displaced vertically for better visualization, and the peaks considered associated with the different additives are marked by green stars (gelatin), blue circles (agar-agar) and violet diamonds/dash-dot lines in the case of Pectigel/pectin.
