It's actually erythorbate, as in sodium erythorbate;
So what is erythorbate?
Erythorbate is salt of erythorbic acid which is an isomer of Vitamin C (Ascorbic acid). It also poses similar effect as vitamin C and its salt. Erythorbate is much more efficient as antioxidant than ascorbate (salt of vitamin C) without acidic taste. So it’s added to hotdogs and hamburgers to keep the taste and appearance of meat fresh without changing the taste. It’s widely used in meat processing, beverage and cosmetics to improve antioxidant effect. Erythorbate is usually produced through fermentation of corn starch etc...