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IPTG (isopropyl-β-D-thiogalactopyranoside), ultrapure


I3325 I3305 I3301
IPTG, a non-metabolizable galactose analog, is commonly used in cloning procedures that require induction of β-galactosidase activity

IPTG powder can be stored at Room Temperature. For optimal shelf-life, we recommend storage, with dessicant, at -20oC. IPTG stock solution is typically made at a 1M concentration and stored at -20oC. We recommend making single-use aliquots to prevent repeated freeze-thaw cycles of IPTG in solution.

IPTG is used in conjunction with X-Gal or Bluo-Gal in blue-white selection of recombinant bacterial colonies that induce expression of the lac operon in Escherichia coli. IPTG functions by binding to the lacI repressor and altering its conformation, which prevents the repression of the β-galactosidase coding gene lacZ. Teknova IPTG is Dioxane-Free

Formula: C₉H₁₈O₅S
MW: 238,31 g/mol
MDL Number: MFCD00063273
CAS Number: 367-93-1



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Size Supplier No. VWR Catalog Number Unit Price Quantity
1 g I3301 100219-816 Each (1g) Retrieving Restricted
25 g I3325 100218-372 Each (25g) Retrieving Restricted
5 g I3305 100219-244 Each (5g) 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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