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Ribonuclease Inhibitor

recombinant, expressed in E. coli, 20-40 units/μL

MDL number:

Quality Level


expressed in E. coli


for molecular biology


buffered aqueous solution

mol wt

~50 kDa


20-40 units/μL

shipped in

wet ice

storage temp.


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General description

Ribonuclease inhibitor works to inhibit RNase activity by forming a tight, non-covalent 1:1 complex. It is derived from E. coli that express portions of the human placental ribonuclease inhibitor. It inhibits RNases A, B, and C. It will not inhibit RNases H, 1, T1, S1 Nuclease, SP6, T7 RNA Polymerase, T3 RNA Polymerase, AMV Reverse Transcriptase, M-MLV Reverse Transcriptase, or Taq Polymerase. The inhibitor can be removed by phenol extraction or by heating to 65°C for 10 minutes.


Useful for in vitro inhibition of ribonucleases, including procedures like cDNA synthesis, RT-PCR, and in vitro transcription and translation.
Suitable for use in
  • in vitro inhibition of ribonucleases
  • cDNA synthesis
  • RT-PCR
  • in vitro transcription and translation

Biochem/physiol Actions

Inhibits RNase by forming a tight, non-covalent 1:1 complex.


Ribonuclease Inhibitor is provided as a solution in 20 mM HEPES-KOH( pH 7.6), 50 mM KCl, 8 mM DTT and 50% glycerol.

Unit Definition

One unit will reduce the activity of 5 ng of ribonuclease A by 50% in a cytidine 2′:3′-cyclic monophosphate system.

Physical form

Solution in 20 mM HEPES-KOH, pH 7.6, 50 mM KCl, 8 mM DTT and 50% glycerol.



Signal Word


Hazard Statements

Precautionary Statements

Hazard Classifications

Eye Dam. 1

Storage Class Code

10 - Combustible liquids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

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Certificate of Origin

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