Last time our laboratory bought Shaanxi Pioneer Biotech IPTG.
It's very cheap ! so we bought more than 1 kg. 800 U.Sdollar
Unfortunately, after testing IPTG , we figure out their IPTG has no effect.
And also it was not solulble at 1M condition... So we made it 0.5 mM stock.
Anyone know about cheap and effective IPTG?
If IPTG is the cost-limiting factor for you, you should look at substituting it with lactose. William Studier has published formulations of "autoinduction media" using lactose in the place of IPTG. That isn't just cheaper, but also cleverer, in terms of suppressing expression completely while growing up.
I use IPTG from Goldbio here in the US. It's not quite as cheap as your Shaanxi scam but hey, at least it works :-P
Thank you for your reply Michael.
We follow your advice and order it already!