The Fresh Loaf

News & Information for Amateur Bakers and Artisan Bread Enthusiasts

Preservatives in yeast?

kimemerson's picture
kimemerson

Preservatives in yeast?

Are there preservatives in commercial yeasts? ADY or cake/fresh/compressed. If one is concerned with having any impurities - preservatives, chemicals, whatever... - in their bread, is it simply safest to make it all natural (sourdough)? 

suave's picture
suave

Yes.

kimemerson's picture
kimemerson

All commercial yeasts? No variation? No exception? Is that fundamental to making it or could there be such a yeast w/o preservatives. somewhere?

albacore's picture
albacore

A preservative, by its nature will be designed to inhibit microorganism growth - the very thing that yeast promotes, so I don't see how the two can exist together.

Instant yeast contains no preservative, but 3000ppm ascorbic acid and a small amount of sorbitan monostearate emulsifier. FY and ADY probably don't contain any of these.

Lance

kimemerson's picture
kimemerson

I ask because I went to a local health-food store to look for fresh yeast. I was told they don't use it because it has preservatives. (I don't know what they use instead. It's not all natural yeast there.) As long as I'm going to use commercial yeast (I do sourdough, but not everything I do is sourdough), I'd like to know definitively about preservatives.

And if commercial yeasts do in fact have preservatives, is it a matter of brand? If I can buy organic, hormone-free milk, or buy the milk loaded with the crap I don't like, do I have similar choices with yeast? 

clazar123's picture
clazar123

The small packets of Red Star yeast, single use, contain only yeast.

https://www.amazon.com/Red-Star-Yeast-Gluten-0-75-Ounce/dp/B00473Q9R4

 

The larger container, which is opened over and over, contain preservatives.

https://www.amazon.com/Red-Star-Yeast-Quick-Rise/dp/B00DVWWS7C/ref=pd_lpo_vtph_325_tr_img_1?_encoding=UTF8&psc=1&refRID=6VH9DVRMJQZAHPKNPFX7

albacore's picture
albacore

As in my previous post, the jar of instant yeast contains

  • sorbitan monostearate - emulsifier to help the yeast mix and hydrate
  • ascorbic acid - flour improver, even permitted and found in some organic flours

Neither of these are preservatives.

The sachet contains active dried yeast, not instant yeast. It is produced by a different technique and requires hydrating prior to use.

The op could also consider Bioreal organic yeast.

Lance

kimemerson's picture
kimemerson

As it is I buy 2# ADY for about $9.00. As a rule I'm ok with ADY and at that cost I'd be nuts to go for small quantities. But I'm interested in using FY and I was taken by surprise when told it had preservatives. I can get FY dirt cheap too. Just curious about the preservative factor.