Apple flavour Pale Ale?

[bones]

Hi Guys,

In the beginning of December i brewed this:

9kg Pale malt
100g Challenger 90 mins
40g Challenger 15 mins

10 ish gallon
I kegged half in a top tap king keg drunk over Christmas lovely :drink:

The other half i kegged in a 4.5 gallon brown plastic pin.
So about 10 weeks in the barrel
The beer had mellowed quite a lot but there was a Appley flavour.... what do you think caused this?

 

[Hawks]

Could it be the yeast? WLP023 has apple flavours for example.

 

[jamesb]

CHARACTERISTICS: Acetaldehyde has the flavor and
aroma of green apples. It can also taste and smell
acetic/cidery.
CHEMISTRY: Formed as a precursor to alcohol by the
yeast, or as a product of the oxidation of alcohol to acetic
acid.
CAUSES: Acetaldehyde from yeast metabolism as a step
in the production of alcohol from glucose has a crisp
green apple flavor. If produced from the oxidation of
alcohol to acetic acid, whether by oxidation or by
acetobacter, this flavor will be more vinegary and less
pleasant.
PROCESS: As a product of yeast metabolism, it can be
caused by the strain itself or by premature termination of
the yeast's fermentation. The reaction from glucose to
alcohol may be stopped at the acetaldehyde stage by
factors such as oxygen depletion, premature flocculation,
etc. It may also be produced by contamination by acetic
acid bacteria.
REMOVAL: Use a good yeast strain that will attenuate
the wort properly. Oxygenate the wort at yeast-pitching
time. DO NOT splash or oxygenate the wort when
racking or bottling. Long lagering periods will also reduce
acetaldehyde.

 

[bones]

Thanks james for the info :thumb:

A couple more things...

The yeast i used was Nottingham, i pitched with 50grams to get things moving as the temps outside were about zero.

I pitched the started at 24degs and the brew held it there even with sub zero temps, i insulated the bin with a sleeping bag.

The keg that was drunk early did not taste... yeah kind of fresh apple not vinagar or cider like the more matured cask.

Do you think 10 weeks was too long?

Thanks
Bones

 

[beer taster]

Hi bones
Not sure about the chemistry but green apple flavour is normally associated with a green beer i.e. drunk too soon. The only time I’ve experienced green apple flavour is when I have transported my beer in a barrel. The green apple taste subsided over a few days then the beer was fine. ..Have you stirred up the barrel?
Mark

 

[bones]

Hi bones
Not sure about the chemistry but green apple flavour is normally associated with a green beer i.e. drunk too soon. The only time I’ve experienced green apple flavour is when I have transported my beer in a barrel. The green apple taste subsided over a few days then the beer was fine. ..Have you stirred up the barrel?
Mark

The beer was 10 weeks in keg so not too green....

Keg was not moved...