What are X Gal and IPTG storage conditions?

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Mahesh Chandak

1M stock solution of IPTG is stable for 6 months at -20. X-Gal is also stable for 6 months at -20C, however as you may use x-gal vial multiple times it is better to restock it after every 2 to 3 months. Note- X-gal is hygroscopic

Jaroslaw Krol

IPTG even longer. Xgal becoming dark over time it its clear should be fine.

Barbara Molini

I make IPTG fresh every time. X-gal in DMF(dimethyl formamide) can last for months.