There is no such stuff as "earthobate". It is a misspelling of
erythorbate. Sodium erythorbate (a closely related chemical to
vitamin C) is an antioxidant and used in foods to prevent colour
and texture changes caused by air.
I'm not familiar with the term "earthobate." It does not appear to be a standard English word. Could you provide more context or clarify so I can better assist you?