For how long...
...can I keep peanut butter and maple syrup after they've been opened?A friend brought me huge(I mean huge!) jars in june.They're half empty now(or half full if you're optimistic!).I'm in Brazil,it's almost Spring here but it's so hot it feels like Summer,so they're in the fridge.It's impossible to find maple syrup in Brazil.I would hate to see it go bad,so depending on your answers maybe I'll use it for something other than just breakfast.
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Maple syrup can keep "forever" in the refrigerator. The high sugar content well preserves it. The danger is from mold which can grow in the moist environment. Be careful not to contaminate it and watch for any obvious signs of growth. Otherwise, enjoy!
Peanut butter "best by" dates assume RT storage. You can extend that considerably in the fridge. Low in moisture but high in unsaturated fat, the danger is oxidization. Oxidization = free radicals = cancer. A year is reasonable I think. In any case, *before* it tastes stale.