E numbers are codes for substances that are permitted to be used as food additives for use within the European Union and EFTA. The "E" stands for "Europe".Commonly found on food labels, their safety assessment and approval are the responsibility of the European Food Safety Authority.
So, this is why gellan gum become more and more popular, because of E418,safe food additive.
Reference:
Cinogel Biotech,Available at:http://www.cinogel.com/