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PCR
Nucleotide Mix, Cat. No. 1581295) may be added to the reaction mixture
as a single reagent. In addition, individual
PCR
Grade dNTPs and a set of
PCR
Grade dNTPs (Cat. No. 1969064) are available. If you increase the
concentration of dNTPs you must also increase Mg2+ concentration. Increases
in dNTP concentration reduce free Mg2+, thus interfering with polymerase
activity and decreasing primer annealing. For prevention of carry-over contamination
a higher concentration of dUTP is usually used in place of dTTP (for details,
see
Preventing
carry-over contamination with uracil-DNA glycosylase). The final
dNTP concentration should be 50500 M (each dNTP). The most commonly used
dNTP concentration is 200 M.
pH
Generally, the pH of the reaction buffer supplied with the corresponding
thermostable DNA polymerase (pH 8.39.0) will give optimal results. However,
for some systems, raising the pH may stabilize the template and enhance
results. Note: Determining the optimal reaction pH can be simplified with
the
PCR Optimization
Kit from Roche Applied Science (Cat. No. 1636138).
Reaction additives
In some cases, adding the following compounds can enhance the efficiency
or specificity of PCR:
- Betaine (0.52 M)
- Bovine serum albumin (BSA; 100 ng/50 l)
- Detergents
- Dimethylsulfoxide (DMSO; 210%) (v/v)
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Using THERMAL DESORPTION GAS CHROMATOGRAPHY for the identification of fragrance and other components in cosmetic products