Gellan gum does not contain residues of heavy metal or other contaminants in excess of FDA tolerances. 21 CFR 172.665 requires that residual isopropyl alcohol is not to exceed 0.075 percent in gellan gum used as a direct food additive. The gellan gum also must be produced by a process that renders it free of viable cells of P. elodea
References:
Chaplin, M. Date Unknown. Water Structure and Behavior. Available at: http://www.lsbu.ac.uk/water/index.html.
CP Kelco. 2004. Petition for Evaluation of Gellan Gum for Inclusion on the National List of Substances Allowed in Organic Production and Handling (7 CFR 205.605(b)). Available at http://www.ams.usda.gov/nop/NationalList/GellanGum.pdf.
Donner, L.W. and D.D. Douds. 1995. Purification of commercial gellan to monovalent cation salts results in acute modification of solution and gel-forming properties.” Carbohydrate Research 273 (1995) 225-233. Available at: http://wyndmoor.arserrc.gov/Page/1995/6198.pdf.
