RNase Inhibitors

Ribonucleases (RNases) are ubiquitous and can be introduced into experiments in many ways: for example co-purification during RNA isolation, carryover from bare hands and pipette tips. This RNase contamination can often go unnoticed. RNase Inhibitor is ideal for RNA-sensitive applications such as RT-qPCR as even a small amount of RNase can be detrimental to the final experimental outcome.

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Meridian's RNase Inhibitor

  • Inhibits a broad spectrum of eukaryotic RNases, including RNases A, B and C

  • Free of contaminating DNases, RNases, phosphatases and nickases for improved sample security

  • Active up to 55 °C across a wide range of DTT concentrations and pH

  • Compatible with lyophilization in an assay mix for ambient temperature storage and shipment

The effect of RNase Inhibitor on reverse transcriptase

RNase Inhibitor graph
A 2-fold serial dilution of HeLa cell total RNA (1 μg - 0.075 μg) was reverse transcribed in the presence (lanes 1 - 5) and in the absence (lanes 7 - 11) of RNase Inhibitor, followed by the amplification of a 1 kb fragment of the angiotensin II receptor gene under standard PCR conditions. There was no detectable difference in PCR product in the presence or absence of RNase Inhibitor, indicating that the addition of RNase Inhibitor does not interfere with the function of reverse transcriptase during cDNA synthesis.

RNase Inhibitor, MDX056

Application: RT-qPCR Specimen Type: Purified RNA Concentration: 40 U/‘L High Concentration: No Wet: Yes
Glycerol-Free: No Lyo-Ready: No Air-Dryable: No Dryable: No Sustainability:

Recombinant ribonuclease Inhibitor protein which inhibits different RNases (A, B, C).

Available in 250 ‘L (10,000 Units) or 2.5 mL (100,000 Units) aliquots


Meridian RNase Inhibitors are from a recombinant protein that inhibits different RNases (A, B, C) by binding non-covalently in a 1:1 ratio. With an association constant of 1014 M, they are useful in any applications where the presence of RNases is a potential problem. RNase Inhibitor is tested for activity, SDS-PAGE purity, and the absence of endonucleases, nickases, and exonuclease. The glycerol-free formulation ensures the compatibility of RNase Inhibitor (Glycerol Free) to lyophilized formats.


Description A recombinant ribonuclease Inhibitor protein which inhibits different RNases (A, B, C)
Source E. coli strain carrying the gene of RNase Inhibitor
Molecular weight 50 kDa
Concentration 40 U/µL
Association constant 1014 M
Parameter 25 – 55 °C optimum reaction temperature
pH range 5.0 – 8.0
Appearance Clear, colorless solution
Application RNA purification, cDNA synthesis. RT-PCR, RT-qPCR, In vitro transcription/translation, RNA sequencing, RNase protection assays, enzymatic RNA labeling reaction
Sample type RNA
Presentation Vials
Storage -20 °C (-80 °C for MDX120)
Mix stability See outer label
Inhibition Total RNA incubated with RNase Inhibitor and a concentration gradient of RNase A. No degradation observed on an agarose gel
DNA contamination None detected in PCR amplification with traces overlay with the negative control on E. coli and mouse genomic DNA specific targets.
DNase/RNase Contamination No detectable degradation

FAQs: RNase Inhibitor

RNase inhibitors are commonly used as a precautionary measure in enzymatic manipulations of RNA to inhibit and control for such contaminants. Small amounts of ribonucleases can co-purify with isolated RNA or be introduced from the environment and compromise downstream applications.

Yes, to be on the safe side, we highly recommend the use of RNase inhibitors in all RT reactions, since RNases are nearly everywhere, and it is very easy to contaminate samples during RNA preparation and reaction setup. Even traces of RNase can nick the RNA, causing shortened cDNA products, low yields, and reduced RT-PCR sensitivity.

No, RNase inhibitor is a protein and will be denatured at higher temperatures.

Yes, most RNase inhibitors require reducing conditions to work properly, if the buffer does not contain DTT, the RNase inhibitor will not work. For optimal RNase inhibition, a final concentration of 1 mM DTT is required.

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