EXTRACTME miRNA KIT (EM12) – Discontinued

The EXTRACTME miRNA KIT is designed for the rapid and efficient purification of miRNA with possibility of simultaneous purification of large RNA and DNA. High quality miRNA may be purified from 1-10 mg of tissue (fresh or frozen) and 104-106 cultured cells. The isolation protocol, buffers formulations and columns were optimized for high isolation efficiency and purity of miRNA. The product is intended for research use only.

EM12, EM12-010, EM12-050, EM12-250

Available Options:
SKU Exctractions
EM12-250 250 extractions Ask for an offer
EM12-050 50 extractions Ask for an offer


The EXTRACTME miRNA KIT utilizes spin minicolumns with membranes which efficiently and selectively bind nucleic acids at high concentration of chaotropic salts. The isolation procedure consists of 7 steps. In the first isolation step, the tissue is homogenized in order to disintegrate intercellular bonds (epithelial tissue) and fragmentize high-molecular proteins (muscle or connective tissue). Then the homogenate is lysed with guanidine thiocyanate and detergents. Any RNases are inactivated by guanidine thiocyanate and ß-mercaptoethanol. In next step DNA is separated by binding to the first minicolumn. Next the large RNA is bound to the Large RNA Purifcation Column membrane by selective conditions in mixture after addition of ethanol. The miRNA is bound in next step to the  miRNA Purifcation Column. The three-step washing stage effectively  removes impurities and enzyme inhibitors. The purified miRNA is eluted using a low ionic strength buffer or RNase-free water (pH 7.0-9.0) and can be used directly in all downstream applications such as RT-PCR, Northern blotting, RT-qPCR and so forth.



  • fresh or frozen tissue (stored at -80°C): 1 – 10 mg
  • tissue preserved in RNase inactivating buffers: 1 – 10 mg
  • cell culture: 104 – 104 cells


Approx. 90 μg


  • 25 – 30 minutes (lysis and homogenization time not included)
  • 35 – 70 minutes for homogenization in liquid nitrogen
  • 35 – 50 minutes for mechanical homogenization (ceramic beads)


A260/A280 ratio = 1.9 – 2.1


DNA contamination
All the biological material used for miRNA  isolation also contains DNA. There is no RNA  isolation method which guarantees complete DNA  removal unless the RNA/miRNA sample is treated with DNase after isolation. Even slight  DNA contamination (several gDNA copies per reaction) may give an additional signal in a quantitative PCR analysis after reverse  transcription. In order to avoid this, we recommend treating the purifed miRNA sample  with an appropriate enzyme (eg. termolabile dsDNase, cat. no. EN32). We also recommend  designing primers which are insensitive to DNA contaminations (primers in adjoining exons or  with intron >1.5 kbp) for the purposes of qPCR analysis.

EXTRACTME miRNA KIT (EM12) – Discontinued - Manual



The quality of each production batch (LOT) of the EXTRACTME miRNA KIT is tested using standard QC procedures. The purifed RNA concentration, quality and stability are evaluated by gel electrophoresis and spectrophotometer. In addition, the functional quality is tested by reverse transcription and qPCR.

EXTRACTME miRNA KIT (EM12) – Discontinued - MSDS