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Isopropyl-β-D-thiogalactopyranoside , CAS 367-93-1, Serva

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(IPTG, Isopropyl-1-thio-β-D-galactopyranoside)

C9H18O5S • Mw 238.3 • CAS 367-93-1



Analog of galactose, not split by β-galactosidase. Inducer of the lac operon in bacteria.

Used in conjunction with XGal (5-bromo-4-chloro-indolyl-β-D-galactoside, cat. no. 15243)

for detection of lac+ colonies. Dissolve in H20 to 200 mg/ml, sterilize by filtration and store

in aliquots at -20 °C. For detection of transformants, use in final concentration of 0.1 mM.


Assay (HPLC)
[α] 20 °C/D (c=1 in water)
98 - 101 %
-28.5 ° to -34.5 °
not detected


Storage Temperature: -15 °C to -25 °C

EINECS: 206-703-0 • WGK: 1 • HS: 29389090