how does light affects yeasts

Question

how does light affects yeasts

ElectronSurf

2018年7月8日 17:15

Red LED light (630 nm) stimulated cell growth but slightly inhibited ethanol formation. In contrast, Blue LED light (470 nm) significantly inhibited cell growth but stimulated ethanol formation.

is it good idea to put our batch under red light exposure for first 3 days and then keep it under blue light for the rest of fermentation?

if that bit of LED light can increase the production of ethanol i guess we can have our batch ready sooner, right?

what if we use red and blue light at the same time?

Topic light yeast fermentation homebrew

Category Mac

mattrices · Accepted Answer · 2018年7月8日 17:15

It may be a good idea to use red light in your yeast starters when you have the most cell growth. Using it in primary may over populate your batch by diverting glucose that would have gone to EtOH production to biomass production unless you use a smaller starter.

The blue light may be useful for maximizing attenuation. If blue light supplies additional energy to the yeast as the paper suggests, they may be able to metabolize more sugar than would be otherwise possible.

Use both and tell us what happens! In plants using the red and blue spectrum has synergistic effects so it could be beneficial depending on how the yeast are utilizing this light as energy.

Evil Zymurgist · Accepted Answer · 2018年7月8日 14:46

While that paper is interesting. I think it applies more for ethanol production as a fuel rather than beer.

While light can effect yeast In good and bad ways, In general light is bad for beer.

This article explains what spectrums of light are worse than others. https://byo.com/mr-wizard/effect-of-light-on-beer/

Frank van Wensveen · Accepted Answer · 2018年7月6日 12:52

While light might have a slight effect on cell growth, the question is whether or not it's worth the hassle. Keeping in mind that if this were a good idea, commercial breweries would have adopted the practice. Which they haven't, and as a general principle keep in mind that if nobody's doing it, there are usually good reasons for that. :-)

Light (esp. blue) could, on the other hand, interfere with hops and other delicate complex molecules, causing light struck off-flavors and aromas.

how does light affects yeasts

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