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  Section: Biotechnology Methods » Molecular Biology
 
 
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Determination of Amount of RNA by the Orcinol Method

 
     
 
Content
Molecular Biology
  The Central Dogma
  Protein Synthesis in Cell Free Systems
  Chromosomes
  Polytene Chromosomes of Dipterans
  Salivary Gland Preparation (Squash Technique)
  Extraction of Chromatin
  Chromatin Electrophoresis
  Extraction and Electrophoresis of Histones
  Karyotype Analysis
  In Situ Hybridization
  Culturing Peripheral Blood Lymphocytes
  Microslide Preparation of Metaphases for In-Situ Hybridization
  Staining Chromosomes (G-Banding)
  Nucleic Acids
  Extraction of DNA from Bovine Spleen
  Purification of DNA
  Characterization of DNA
  DNA-Dische Diphenylamine Determination
  Melting Point Determination
  CsCl-Density Separation of DNA
  Phenol Extraction of rRNA (Rat liver)
  Spectrophotometric Analysis of rRNA
  Determination of Amount of RNA by the Orcinol Method
  Sucrose Density Fractionation
  Nucleotide Composition of RNA
  Isolation of Genomic DNA—DNA Extraction Procedure
  Isolation of Genomic DNA from Bacterial Cells
  Preparation of Genomic DNA from Bacteria
  Extraction of Genomic DNA from Plant Source
  Extraction of DNA from Goat Liver
  Isolation of Cotton Genomic DNA from Leaf Tissue
  Arabidopsis Thaliana DNA Isolation
  Plant DNA Extraction
  Phenol/Chloroform Extraction of DNA
  Ethanol Precipitation of DNA
  Isolation of Mitochondrial DNA
  Isolation of Chloroplast DNA
  DNA Extraction of Rhizobium (CsCl Method)
  Isolation of Plasmids
  RNA Isolation
  Preparation of Vanadyl-Ribonucleoside Complexes that Inhibit Ribonuclease Activity
  RNA Extraction Method for Cotton
  Isolation of RNA from Bacteroids
  Isolation of RNA from Free-Living Rhizobia
  Estimation of DNA purity and Quantification
  Fungal DNA Isolation
  Methylene Blue DNA Staining
  Transformation
  Blotting Techniques—Southern, Northern, Western Blotting
  Preparing the Probe
  Southern Blotting (First Method)
  Southern Blotting (Second Method)
  Western Blotting
  Western Blot Analysis of Epitoped-tagged Proteins using the Chemifluorescent Detection Method for Alkaline Phosphatase-conjugated Antibodies
  Southern Blot
  Southern Analysis of Mouse Toe/Tail DNA
  Northern Blotting
  Restriction Digestion Methods—Restriction Enzyme Digests
  Restriction Digestion of Plasmid, Cosmid, and Phage DNAs
  Manual Method of Restriction Digestion of Human DNA
  Preparation of High-Molecular-Weight Human DNA Restriction Fragments in Agarose Plugs
  Restriction Enzyme Digestion of DNA
  Electroelution of DNA Fragments from Agarose into Dialysis Tubing
  Isolation of Restriction Fragments from Agarose Gels by Collection onto DEAE Cellulose
  Ligation of Insert DNA to Vector DNA
  PCR Methods (Polymerase Chain Reaction)
  Polymerase Chain Reaction
  DNA Amplification by the PCR Method

Materials
  • RNA
  • Alkaline distilled water
  • Acid-orcinol reagent
  • Boiling water bath
  • Spectrophotometer and cuvettes
Procedure
  1. Prepare a series of serially diluted RNA standards, but with a range from 1.0 mg/mL down to 0.125 mg/mL.
  2. Prepare a serial dilution of your sample RNA.
  3. Place 3.0 mL of each standard and 3.0 mL of each serial dilution of the sample RNA into separate test tubes. Place 3.0 mL of alkaline water in a separate tube.
  4. Add 3.0 mL of acid-orcinol reagent to each tube and mix well.
  5. Add 0.3 mL of alcohol-orcinol reagent to each tube and mix well.
  6. Place the tubes in a boiling water bath for 20 minutes, with marbles placed on top of each tube to prevent evaporation. Cool the tubes by immersion in an ice bath at the end of the 20-minute period.
  7. Turn on a spectrophotometer and adjust the wavelength to 660 nm. Blank the spectrophotometer with the alkaline water/orcinol tube. Measure the A660 of each of the remaining standards and diluted samples.
  8. Plot the absorbance of the standards against the known concentrations. Calculate the extinction coefficient, and calculate the concentration of RNA in your sample. Use the dilution yielding an absorbance between 0.1 and
    1.5 absorbance units.

 
     
 
 
     




     
 
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