liquid beta-gal assay

E Wozei wozei at
Fri Apr 27 17:53:09 EST 2001

Thanks for the suggestions. My blank = yeast cells with lacZ but no 
estrogen. I incubate for 15min and get yellow color development within an 
hour for both the blank and spiked samples. My "no yeast cells" control has 
no cells, no added estrogen and no color development even after days so I'm 
thinking it's probably not an ONPG problem.



>From: David Jansma <davidjansma at>
>To: yeast at
>Subject: Re: liquid beta-gal assay
>Date: 26 Apr 2001 00:51:07 +0100
>Hi Eleanor,
>Does blank = yeast cells without the lacZ gene?  If it is a control without
>cells, how long do you incubate after adding ONPG?  Old ONPG solutions can
>hydrolyze spontaneously, so it is a good idea to make them fresh.  If you
>are incubating for long times, try increasing the concentration of your
>cells instead; that may reduce the colour that you are seeing in your

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