SecurRIN™ Advanced RNase Inhibitor


  • Prevention of RNA degradation during:

  • cDNA synthesis, RNA extraction & storage

  • in vitro transcription and translation

  • Monoclonal antibody preparation procedures


  • Efficient RNAse inhibition even at higher temperatures up to 60°C

  • RNA protection from hydrolysis by RNases A, B and C

  • Economical & stable for weeks at ambient temperature

  • Robust, works well at 5.5 to 9.0 pH, with 0.5 - 1 mM DTT

Catalog. # Product Name Size Price Qty
RNI0301 SecurRIN™ Advanced RNase Inhibitor 2500 u
RNI0305 SecurRIN™ Advanced RNase Inhibitor 12500 u

SecurRIN™ Advanced RNase Inhibitor

Request a Sample.


SecurRIN™ Advanced RNase Inhibitor is a premium tool for RNA protection from degradation during enzymatic reactions, storage or extraction. It is an extraordinary stable and robust enzyme: it works at up to 60°C temperature, remains active after weeks of room temperature exposure and multiple freezing thawing cycles. It is active in different buffer conditions within a broad pH range of 5.5 to 9.0, and within 0.5 - 1 mM concentration of DTT.

SecurRIN™ Advanced RNase Inhibitor is a 50 kDa non-covalent inhibitor of RNase A, RNase B, and RNase C binding them in a 1 to 1 ratio. It is a recombinant protein derived from E. coli strain carrying human placenta RNase Inhibitor gene.

SecurRIN™ Advanced RNase Inhibitor does not inhibit RNAses H, 1, T1, T2 and S1 Nuclease. It influences neither the activity nor the performance of DNA polymerases and of Reverse Transcriptases. The enzyme is free from DNAses and RNAses.



  • Active in all common buffers used for RNA work
  • Acceptable pH range is 5.5 to 9.0
  • Stable at ambient high temperature of up to 60°C
  • Optimally performs at 0.5 - 1 mM DTT concentration
  • 1 - 2 units of the RNase Inhibitor are typically enough for 1 microliter of RNA reaction. Enzyme amount depends on RNAse contamination
  • 1µl of the enzyme is recommended for a standard cDNA synthesis reaction of 20 µl volume
  •  Binds and inhibits RNAse A, RNAse B and RNAse C at 1:1 ratio
  • Does not inhibit RNAse H, RNAse 1, RNAse T1, RNAse T2


Unit Definition

One unit is required to inhibit 5 ng of RNAse A by 50% (measuring the hydrolysis of cytidine 2′, 3′-cyclic monophosphate).



Print version of the protocol: Product Insert SecurRIN™ Advanced RNase Inhibitor
Important Notes
  • RNA is extremely sensitive to degradation by RNases present everywhere. Take care to protect RNA from degradation keep your bench clean, wear gloves, use sterile tubes and filter pipet tips.
  • Check the integrity of RNA prior to cDNA synthesis in denaturing agarose gel.
  • Add SecurRIN™ Advanced RNase Inhibitor in to the cDNA synthesis reaction (~40 units for 20 µl reaction tube) as the first component.
  • In case high contamination with RNAses is suspected, use 2 µl of the RNase Inhibitor. However, to avoid too much DTT in PCR, then use less of cDNA reaction mix as template for further PCR.
  • Include positive and negative controls in parallel for each reaction.
  • Thaw and keep reagents on ice. Mix well before use.
  • For best results, optimize the template and primer amount.
  • Choose optimal reaction temperature in a range recommended for your Reverse Transcriptase.

Perform reaction as recommended for your Reverse Transcriptase. Given temperatures and times are just approximate suggestions.


Prepare a 20 µl reaction:
SecurRIN™ Advanced RNase Inhibitor, 40 u/µl 1 µl (40 u)
10 mM dNTP Mix (NUM0201) 2 µl (1 mM final)
Total RNA     or
Poly-A mRNA
1 pg to 5 µg    or
1 pg to 0.5 µg
Oligo dT primer   or
Random primer   or
Specific primer
0.5 µg    or
0.2 µg    or
15-20 pmol
Water (PCR Water, WAT0110) to 15 µl
  • Mix gently, avoid bubbles.
  • Heat 5 min at 65°C, spin, place on ice for 1 min.
  • Add the 4 µl of 5X RT Reaction Buffer
  • Add 1 µl of Reverse Transcriptase, 200 u/µl and mix well.
  • Incubate 2 min at 42°C for Oligo dT and for Specific primer
    or 10 min at 25°C for Random primer to anneal.
  • Incubate 30-50 min at 50°C to synthesize cDNA.
  • Inactivate at 85°C for 10 min.
  • Store reactions at -20°C or on ice for an immediate use.
  • Use 2-5 µl of this reaction mix per 50 µl PCR reaction.
  • Use 1-2 µl of this reaction mix per 20 µl qPCR reaction.





2500 u 1 x ~65 µl - SecurRIN™ Advanced RNase Inhibitor, 40 u/µl


Storage buffer contains 50% glycerol, 8mM DTT and other components.

RNI0305 12500 u 5 x ~65 µl - SecurRIN™ Advanced RNase Inhibitor, 40 u/µl
  •  In the dark at -20°C.