repackaging 500gm yeast packs

[FatD]

bought a us-05 yeast pack in 500gm. says once opened have to use within 7 days.

 

I'd probably only get through about 100gm in a week. 100 litre system.. what's best way to get around the expiry date?

 

is it o.k to put in smaller bags and refrigerate or would i have to vacuum pack at bare minimum? if so what's cheapest system around?

 

http://oranges-world.com/vacuum-packaging.html something like this?

[Grant R Baker]

Keep in the fridge in air tight container and it will be fine.

When doing small test brews I snip the corner off the yeast packet, sprinkle half a teaspoon into the cooled wort.. the snipped whole is then covered with sellotape, the yeast return to airtight container in the fridge.. has last about 8 test brews over 6 months like that.

[Christian]

I had 100 grams of US05 in a zip-lock bag - used over 6 months or so and had no problems. Seemed to get a bit slower towards the end but no problems with contamination.

[FatD]

thanks for the feedback. always nice to know real world over theory :) yer might split it up into 50 grams then airlock them once open..

 

cheers guys