Ingredient to extend shelf life of home made marshmallows?

Hi all, I'm planning to add canned strawberries to my home made marshmallows. So typically those in can can last up to a year or more, but may be a different story when it's opened and exposed to air.

I'm wondering if there's a way to include something along the process of making marshmallows and adding canned strawberry with an ingredient to extend its shelf life without drastically changing its flavor?

submitted by /u/Colcaps
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