Qiagen Buffers
Formulas for Qiagen Kit Buffers
Do not autoclave solutions containing ethanol, isopropanol or MOPS; use sterile filtration if necessary.
Buffer AE (elution buffer for genomic DNA preps)
- 10 mM Tris-HCl
- 0.5 mM EDTA
- pH 9.0
Buffer P1
- 50 mM Tris-HCl pH 8.0
- 10 mM EDTA
- 100 μg/ml RNaseA
The buffer and RNaseA can also be ordered from Qiagen separately (catalog numbers 19051 and 19101).
Buffer P2
- 200 mM NaOH
- 1% SDS
Buffer P3 (not for spin columns, but for Qiatips, midi, maxi, giga kits)
- 3.0 M potassium acetate pH 5.5
Buffer DP3 (for Qiagen Directprep 96-well miniprep)
- 3.0 M ammonium acetate pH 5.5
Buffer N3
- 4.2 M Gu-HCl
- 0.9 M potassium acetate
- pH 4.8
Buffer PB
- 5 M Gu-HCl
- 30% isopropanol
Buffer QG
- 5.5 M guanidine thiocyanate (GuSCN)
- 20 mM Tris HCl pH 6.6
Buffer PE
- 10 mM Tris-HCl pH 7.5
- 80% ethanol
Buffer QX1 (for solution and binding of agarose gels)
- 7 M NaPO4
- 10 mM NaAc
- pH 5.3
Buffer QXB (for binding of large >3000 bp fragments to columns)
- 5 M GuHCl
Buffer QBT (equilibration buffer)
- 750 mM NaCl
- 50 mM MOPS pH 7.0
- 15% isopropanol
- 0.15% triton X-100
Buffer QC (wash buffer)
- 1.0M NaCl
- 50 mM MOPS pH 7.0
- 15% isopropanol
Buffer QF (elution buffer)
- 1.25M NaCl
- 50 mM Tris-HCl pH 8.5
- 15% isopropanol
Buffer QN
- 1.6M NaCl
- 50 mM MOPS pH 7.0
- 15% isopropanol
Buffer FWB2
- 1M potassium acetate, pH 5.0
Buffer B1 (bacterial lysis buffer)
- 50 mM Tris-HCl pH 8.0
- 50 mM EDTA pH 8.0
- 0.5% Tween-20
- 0.5% Triton-X100
- RNAse A 200 μg/l
Buffer B2 (bacterial lysis buffer)
- 3 M Gu-HCl
- 20% Tween-20
Buffer C1 (cell lysis buffer) (store at +4)
- 1.28 M sucrose
- 40 mM Tris-HCl pH 7.5
- 20 mM MgCl2
- 4% Triton X-100
Buffer G2 (digestion buffer)
- 800 mM GU-HCl
- 30 mM Tris-HCl pH 8.0
- 30 mM EDTA pH 8.0
- 5% Tween-20
- 5% Triton-X100
Buffer Y1 (yeast lysis buffer) (store at +4)
- 1 M Sorbitol
- 100 mM EDTA pH 8.0
- 14 mM beta mercaptoethanol (added just before use)
Buffer PAA (PAGE gel elution of DNA)
- 500 mM NH4Ac
- 100 mM MgAc2
- 1 mM EDTA
- 0.1% SDS
Buffer PNI (purification of oligonucleotides 17 nt and greater)
- 40% (v/v) 5 M guanidinium chloride
- 60% (v/v) isopropanol
Concentration of guanidinium determined by drying down supplied concentrate and measuring mass. Concentration of isopropanol determined by calculation from the supplied user manual.
Buffer RW1 (RNA Wash)
- 20% Ethanol
- 900 mM GITC
- 10 mM Tris-HCl pH 7.5
(from US Patent Application US 2011/0221149 A1, Sept. 15, 2011)
Buffer RPE
- 80% Ethanol
- 100 mM NaCl
- 10 mM Tris-HCl pH 7.5
(from US Patent Application US 2011/0221149 A1, Sept. 15, 2011)
(Source: [1], US Patent 6,383,393)
The LyseBlue indicator dye added to some of the buffers is Thymophthalein, pH shift from colorless to blue at pH 9.3
Recycling Qiagen Columns
The blue and purple Qiagen columns are identical in formulation. They are interchangeable and can be reused multiple times after treatment with hydrochloric acid, re-equilibration, and wash. Very likely this protocol can be used with other similar columns. Unused columns can be cheaply purchased in bulk from Epoch Biolabs.
The reuse protocol is:
- Save the collection tubes and columns after elution of DNA
- Fill the column with 700 μl of 1 M HCl
- Cap and store in an airtight container for at least 24 hours (less than a month)
- Wash the columns and collection tubes in a large beaker of water
- Assemble the column and collection tube and wash the column with 700 μl of DI water, discarding the water
- Repeat
- Fill the column with 700 μl of buffer QBT and spin down, discarding the buffer
- Place the columns in an airtight plastic bag for storage
- Wash the collection tubes, air dry, and store them for reuse
References: PMID 17373483 Davidson Column Recycling instructions