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Fluorescein di-b-D-galactopyranoside


Fluorogenic β-galactosidase substrate.

  • β-gal substrate
  • Less than 20 ppm background

Fluorescein di-β-D-galactopyranoside (FDG) is a widely used substrate for detection of E. coli lacZ β-galactosidase detection by flow cytometry in both mammalian and gram-negative bacteria, as it enters viable cells and gives a fluorescence emission proportional to the enzymatic activity. Marker Gene provides FDG as a high-purity, molecular biology grade with background fluorescence levels below 20 ppm. It is also available already dissolved in solution in our detection kits such as product M0259.

Formula: C₃₂H₃₂O₁₅
MW: 656,593 g/mol
CAS Number: 17817-20-8



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Size Supplier No. VWR Catalog Number Unit Price Quantity
5 mg M0250 101176-218 Each (5mg) Retrieving Restricted
restricted In order to process your orders without delay, we request that you provide the required business documentation to purchase this product.

To order chemicals, medical devices, or other restricted products please provide identification that includes your business name and shipping address via email or fax 484.881.5997 referencing your VWR account number . Acceptable forms of identification are:

  • State issued document with your organization's Federal Tax ID Number
  • State issued document with your organization's Resale Tax ID Number
  • City or County issued Business License
  • State Department of Health Services License
  • Any other ID issued by the State that includes the business name and address

* Please note if your account is within the State of California two of these pieces of identification will be required.
VWR will not lift restrictions for residential shipping addresses.

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