Changes

Jump to: navigation, search

Lactobacillus

221 bytes removed, 12:18, 23 July 2015
Fixing italics
====Hop Tolerance====
''"There is a fair bit of research into hop tolerance out there; its not a simple topic as a number of factors come into play to produce hop tolerance. To make things even more complicated, hop tolerance is an inducable trait in many lacto ''Lacto'' species - meaning that a seemingly susceptible strain can become resistant by culturing in ever-increasing doses, and a seemingly resistant strain can become susceptible after a generation or four in a hop-free media.'' ~ Bryan Heit of [http://suigenerisbrewing.blogspot.com/ Sui Generis Brewing blog] on Lactobacillus and Hop Tolerance
''Edit: I tried to add (but facebooks aversion to white space almost defeated me) that I've been trying to generate a permanently high-alpha acid resistant lacto strain for a few months now. I've been culturing L. brevis in escalating IBU wort (starting at 10, currently at 25). Every 4th generation (1 generation = a subculture of a stationary-phase lacto culture, not as in # cell divisions) I pass it through 2 generations of an IBU-free media to try and select for strains which maintain this resistance. This seems to have worked upto ~18 IBU, but past that point the resistance appears to remain inducable. I'm hoping a few more generations will provide me with a permanently tolerant strain.''
''There are some other option; I've purified (but didn't keep - doh) some pretty resistant strains from grain by by making plates where you half-fill a plate, on an angle, with a high-IBU wort, and then overlay that with a no-IBU wort. This gives you a gradient plate, with low-IBUs on the end where the hopped-wort layer is thinnest and high IBUs where it is thickest. Some of those strains were resistant to over 30IBU, but being early in my yeast farming days I didn't bother keeping those.'' ''I'm hoping to have a " - Bryan Heit of [http://suigenerisbrewing.blogspot.com/ Sui Generis Brewing blog post ] on that sometime in the next few months, but life is nuts right now so I offer no guarantee."'' Lactobacillus and Hop Tolerance <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/1002795743081973/?comment_id=1003625646332316&offset=0&total_comments=16&comment_tracking=%7B%22tn%22%3A%22R%22%7D Conversation with Bryan Heit on Milk The Funk. 01/19/2015.]</ref>
====Storage====

Navigation menu