Yeast starter

[mofox1]

I still don't get it. Even adding 0.5gms to a massive 5L starter while boiling it (if for some reason you didn't step to 5L in the first place) I can't see how it'd cause a boil over. Not a big deal, just can't fathom it.

Quick experiment for you... boil some water in a mug in a microwave. Take it out and throw a teaspoon of sugar in it. Boom!

Same thing happens with boiling up your malt extract - plenty of nucleation points for bubbles to form.

I unintentionally did it the other day. Forgot the nutrient, so took it off the boil and left it for a couple of minutes (okay, maybe just one minute). Dropped my tiny 1/10 teaspoon measure of nutrient in and it *still* gushed over the top. Just not as bad as the first (and only other) time I did it while it was still actively boiling. Thank god the missus wasn't home for that one.

 

[danestead]

I looked on Wyeast site:

https://www.wyeastlab.com/hb_makingastarter.cfm

Recipe 0.5 cup DME (100g, 3.5oz) ½ tsp Wyeast Nutrient 1qt.(1L) H2O

1/2 a tsp seems a lot for 1 litre starter

That's really interesting. Maybe worth emailing wyeast again.

I can 100% confirm they told me 0.1g/L of nutrient for your starter. Zinc toxicity would probably be pretty up there if you were adding 10x that, as said in an earlier post.

 

[danestead]

I still don't get it. Even adding 0.5gms to a massive 5L starter while boiling it (if for some reason you didn't step to 5L in the first place) I can't see how it'd cause a boil over. Not a big deal, just can't fathom it.

K. Try it.

 

[Tropico]

That's really interesting. Maybe worth emailing wyeast again.

I can 100% confirm they told me 0.1g/L of nutrient for your starter. Zinc toxicity would probably be pretty up there if you were adding 10x that, as said in an earlier post.

Its sounds like a mistake, they also say 1/2 tsp (2.2gm) per 5 gallons of wort (19 litres).

So 0.1gm would be the same ratio.

 

[slcmorro]

K. Try it.

Mofox1 already suggested this. I'll take your words for it - didn't mean to come across pompous, I was just in disbelief. Didn't think that tiny amount could cause a volume (mass?) so much larger to react in that way.

 

[Screwtop]

Anyone know of any craft brewery using yeast nutrient?


Screwy

 

[Vini2ton]

I've started using a pressure-cooker and 500ml preserving jars to make starter wort. I put the very slightest pinch of nutrient in each jar. I don't know if I need to. I have the odd berocca myself at times and **** knows if they do me any good. My starters boom though.