Light malt extract expired - does it matter?

Om shanti · 04-10-09, 11:25

I have an almost unused bag of light malt extract that supposedly expired a few months ago. Anyone know if this matters for use in liquid culture?

Hippie3 · 04-10-09, 11:28

should be ok

Om shanti · 04-10-09, 11:35

Thanks, I will give it a try then! :-)

Soliver · 04-11-09, 03:19

Never goes bad, in my experience, as long as bugs and moisture can't get to it

soliver

nyi · 06-01-09, 21:38

What happens when some moisture got in it? My malt after a few months in a box developed a crispy skin maybe 0,5cm (1/5 in) on top. Recent LCs and agars made with it developed some sediment after PCing. Agar seem slow to germinate spores, but LCs are relatively OK.

Awestruck · 06-01-09, 22:01

Quote:

Originally Posted by nyi

What happens when some moisture got in it? My malt after a few months in a box developed a crispy skin maybe 0,5cm (1/5 in) on top. Recent LCs and agars made with it developed some sediment after PCing. Agar seem slow to germinate spores, but LCs are relatively OK.

I would think that you got some microbes that ate some of your malt. I think that is what you are seeing on the bottom of the LC jars. Harmless though.

sandman · 06-01-09, 22:10

LME is terribly sensitive to moisture. I cant even dump it off a spoon over a bowl of boiling water. The steam makes it stick to the spoon in the 1 second that the spoon swoops down over the bowl lol. I wouldnt use any that has absorbed water in storage myself.

nyi · 06-01-09, 22:48

This doesn't explain the slowness of the plates and average speed of LCs. But I have problems with the brand of agar I use in general... but it's cheap, clean and never did problems until recently.

The only good bacteria on a plate is dead bacteria, you're right awestruck, I don't bother over the sediment. Sandman, I noticed this and other problems with hygroscopic nature of malt too. Even when I measure the malt on a tinfoil with my scale, a part of the powder gets stuck to the tinfoil and won't fall. And when the malt gets on my scale, that's hell... it's the worst to clean substance I measure with this scale.

Ok, I'll buy another Malt powder today at lunch break.

sandman · 06-01-09, 23:00

Yea man I know EXACTLY what you mean!

essentrik1 · 06-03-09, 18:02

I think the expiration date is more for brewing. Being a homebrewer as well, old malt extract has a very noticeable off flavor from oxidation. It's definitely not something you would want in your beer. I'm pretty sure the little guys don't care about that though.

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04-10-09, 11:25	#1 (permalink)
Om shanti S.W.I.M. in H.POO Join Date: Jan 2008 Posts: 1,297	Light malt extract expired - does it matter? I have an almost unused bag of light malt extract that supposedly expired a few months ago. Anyone know if this matters for use in liquid culture? __________________ The most important thing is to find out what is the most important thing.-S. Suzuki

04-10-09, 11:28	#2 (permalink)
Hippie3 DUNG DEALER Join Date: Feb 2001 Posts: 43,266	should be ok __________________ visit dial-a-hippie .

04-10-09, 11:35	#3 (permalink)
Om shanti S.W.I.M. in H.POO Join Date: Jan 2008 Posts: 1,297	Thanks, I will give it a try then! :-) __________________ The most important thing is to find out what is the most important thing.-S. Suzuki

06-01-09, 21:38	#5 (permalink)
nyi Mycophage Join Date: Dec 2008 Posts: 104	What happens when some moisture got in it? My malt after a few months in a box developed a crispy skin maybe 0,5cm (1/5 in) on top. Recent LCs and agars made with it developed some sediment after PCing. Agar seem slow to germinate spores, but LCs are relatively OK. __________________ We're animals... nature just decided, that the next global disaster shouldn't be an big fat asteroid... it should be an animal.

04-11-09, 03:19	#4 (permalink)
Soliver Deviant Join Date: Feb 2005 Posts: 1,778	Never goes bad, in my experience, as long as bugs and moisture can't get to it soliver

06-01-09, 22:10	#7 (permalink)
sandman Harvester of Sorrow Join Date: Apr 1972 Posts: 1,967	LME is terribly sensitive to moisture. I cant even dump it off a spoon over a bowl of boiling water. The steam makes it stick to the spoon in the 1 second that the spoon swoops down over the bowl lol. I wouldnt use any that has absorbed water in storage myself. __________________ Dreams are real. But they are made of viewpoints, of images, of memories and puns and lost hopes

06-01-09, 22:48	#8 (permalink)
nyi Mycophage Join Date: Dec 2008 Posts: 104	This doesn't explain the slowness of the plates and average speed of LCs. But I have problems with the brand of agar I use in general... but it's cheap, clean and never did problems until recently. The only good bacteria on a plate is dead bacteria, you're right awestruck, I don't bother over the sediment. Sandman, I noticed this and other problems with hygroscopic nature of malt too. Even when I measure the malt on a tinfoil with my scale, a part of the powder gets stuck to the tinfoil and won't fall. And when the malt gets on my scale, that's hell... it's the worst to clean substance I measure with this scale. Ok, I'll buy another Malt powder today at lunch break. __________________ We're animals... nature just decided, that the next global disaster shouldn't be an big fat asteroid... it should be an animal.

06-01-09, 23:00	#9 (permalink)
sandman Harvester of Sorrow Join Date: Apr 1972 Posts: 1,967	Yea man I know EXACTLY what you mean! __________________ Dreams are real. But they are made of viewpoints, of images, of memories and puns and lost hopes

06-03-09, 18:02	#10 (permalink)
essentrik1 Mycophiliac Join Date: Jan 2009 Posts: 54	I think the expiration date is more for brewing. Being a homebrewer as well, old malt extract has a very noticeable off flavor from oxidation. It's definitely not something you would want in your beer. I'm pretty sure the little guys don't care about that though.

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