(for DNA storage and standard manipulations)
Tip 1: DNA is quite stable in TE buffer at 4 ºC. If stored in elution buffer or water then freezing at -20 ºC is advised.
Tip 2: TE can reduce some enzymatic reactions, for example, DNA sequencing reactions and occasionally ligations. Elute DNA to be ligated or sequenced in either elution buffer or water.
Tip 3: Alternatively, if large numbers of samples need to be stored, or ambient long term storage of plasmid DNA samples is required, consider Biomatrica’s DNAstable products (Catalog No. 93021-001).
10mM Tris-Cl, pH 8.5
Tip: Elution buffer is basically TE without the EDTA which is the component that can disrupt enzymatic reactions. DNA is more stable in this than in water.
To make nuclease free water, fill a small clean lab bottle with deionised water filtered through a 0.22µm pore filter using a syringe and then autoclave. Replace every few weeks/months to avoid contamination.
Tip: Tissue culture grade nuclease free water is available from many suppliers, but you can just make it yourself. You will only be using small amounts so if you do buy it will last you a while if it doesn’t become contaminated.
Tip 1: This buffer is stored in small aliquots at -20 °C.
Tip 2: The BSA can precipitate after freezing and should be re-suspended by vortexing or warming to 37 °C before use.
Adjust pH to 6.7 with 5 M KOH
Add water to bring volume up to 100 mL
Sterilize the buffer by passing it through a 0.22 µm syringe filter
Store at -20 ºC
Component Final concentration Amount per litre
55mM 10.88g MnCl2.4H2O
15mM 2.2g CaCl2.2H2O (Catalog No. L3306)
250mM 18.65g KCl (Catalog No. P9541)
10mM 20mL of 0.5 M PIPES pH 6.7 solution
H2O Up to 1 litre
Sterilize the buffer by passing it through a 0.22 µm syringe filter.
Store at -20 °C
Make up to the final volume and autoclave
*The MgCl2 must be added after autoclaving from a 1 M stock.