chemical reagents control in pharmaceutical industry

[mengmengxu]

     USP Reference Standards are not labeled with an expiration date. USP uses an "official lot system" which does not assign a valid use date until the subsequent lot is released. When USP updates and publishes a new official lot, the previous lot will be assigned an expiration date which is referred to as the "valid use date."

How do you assign expiration date for chemical reagents when first received? Solid reagents, Solution, and Lab prepared?

[gkassnarayan]

Depending on the nature of the chemical, a time scale can be used to fix the expiry date.  In case of non-hygropic solids, it may be 2-3 years.  The sample received should be having an expiry date created by the preparer (lab or manufacturer).  Solutions have to be made fresh and to be accepted only when a record of solution stability is available.