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How long can I keep an unused container of brine with cure#1 in the fridge before it is no longer safe for use? I figure the salts and cure would last indefinitely, but I'm not so sure of the sugars?
A Brine is easy to make so there is really no great advantage to making it ahead. That being said the only info I can find on Cure #1 dissipation is that it begins to Gas Out, converts to Nitric Oxide at 130°F. At the end of a smoke about 10-20% of the original amount remains. I can not find any info on Cure dissipation once it is dissolved in water. Since many brine cured meats can be soaked for up to 4 weeks, I would say I would not make more Brine than you will use in 2-3 weeks. Your safest option would be to combine all the dry ingredients for 1 Gallon of Brine in individual zip bags. When needed make up one gallon, use what you need and discard the remainder after 2 weeks...JJ