Expiration dates ! - (Aug/09/2007 )
QUOTE (fred_33 @ Aug 10 2007, 01:51 AM)
clumps is due to humidity.
Do you have a lyophiliser in your lab? It's an interesting technique to restore water free powder. without damaging by heating.
Do you have a lyophiliser in your lab? It's an interesting technique to restore water free powder. without damaging by heating.
don't think so
most products in the lab from Sigma, wondering if i can find the expiration dates for these products from the website...
-strawberry-
QUOTE (TheDifferentiator @ Aug 9 2007, 10:13 AM)
Sometimes you can check the manufacturer's website for starters to get an idea for when products will expire. For instance, SIGMA posts Certificates of Analysis on their products. If you type in the catalog number and then search by lot number, you can find information on your product. Or, you can call their technical support and ask as well. Sorry, I know that only helps if you have bought a chemical, rather than prepared the reagent yourself, but the other replies seem like good suggestions as well.
i tried to check the site for the expiration date, but what is " Certificate of Analysis " !!
-strawberry-
There may be batch to batch difference... therefore the concentration of the old and the new are not the same.
May I ask what amino acid it is?
-Minnie Mouse-
sure Minnie, it's prolin !
-strawberry-
hey there,
"Certificate of Analysis" is the report which the suppliers provide to the consumer suggesting the ideal specifications of that material and the actual specifications of the materail supplied. it also specifies the Lot no and date of expiry too. in other words it suggest the tests that they have carried out at their end before the release of the product from their facility to check the quality of the product.
Hope this info helps.
Phali.
-phali-