La Fin Du Monde yeast harvest

[flyangler18]

Maybe worth an experiement? I'm thinking a flask of water and introduce smoke, or something visible and heavier than air. Add foil and swirl to see if there is actually an exchange that many claim occurs. Just spitballing here.

Have at it - but why experiment to prove/disprove something that has already been demonstrated to be true in any lab that is working with microbial cultures? This has been documented in the literature many, many times.

A stirplate is the most effective way to grow up a starter because it promotes gas exchange and gets oxygen to the yeast when used with either a foam plug on the flask or foil; Mr. Malty's calculator bears this out.

For me, this isn't a theoretical discussion - it's a practical one. I follow established lab procedure for growing yeast and my beer is better for it.

 

[cactusgarrett]

A stirplate is the most effective way to grow up a starter because it promotes gas exchange and gets oxygen to the yeast when used with either a foam plug on the flask or foil; Mr. Malty's calculator bears this out.

Understandable. I guess i neglected to mention that I don't use a stirplate, so my thoughts are from the point of view of non-continuous stirring. I, personally, believe a stirplate performs as you state.

 

[flyangler18]

Consult this excellent article: MB Raines, Ph.D. - Guide to Yeast Culturing for Homebrewers - Maltose Falcons Home Brewing Society (Los Angeles Homebrewing)

 

[Malticulous]

Not on a stir plate or if you shake it intermittently. Even a simple starter that is left to ferment out with a loose fitting cap of foil will exchange gas. Besides, getting oxygen to the yeast is important before the ferment starts. The yeast need oxygen to process sterols for healthy cell wells. Once the yeast have grown to numbers adequate to ferment the starter wort and oxygen is depleted, then the anaerobic process of fermentation starts. Growth is an aerobic process.

Not when you swirl it, which you should be doing often anyway. Swirling is going to exchange a little gas with the outside world.

I'm still at a loss as to why you singled me out for my statement. It still holds true. Aeration is very important up to high kraeusen. But I said after it gassing of CO2 it's essentially a one way valve anyway. That is indeed true. I hope we all learned something (that is the reason I'm here.)

 

[rhys333]

Old thread reboot.

Does anyone know if Unbroue still bottles La Fin Du Monde with the primary yeast strain, or did they wise up? I have one bottle left that I might try to build yeast from.