Thermo Scientific™

Phusion High-Fidelity PCR Master Mix with GC Buffer

Catalog number:  F532S

Related applications:

PCR & Real-Time PCR

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Thermo Scientific Phusion High-Fidelity DNA Polymerases set a gold standard for high performance PCR. Featuring an error rate 50-fold lower than that of Taq, and 6-fold lower than that of Pfu, Phusion High-Fidelity DNA Polymerase is excellent choice for cloning and other applications requiring high fidelity. Phusion DNA Polymerases offer robust performance with short protocol times, even in the presence of PCR inhibitors, and generate higher yields with lower enzyme amounts than other DNA polymerase.

Phusion High-Fidelity PCR Master Mix is convenient 2X mix containing Phusion DNA Polymerase, nucleotides and optimized reaction buffer including MgCl2. Two master mix formulations are available - with HF Buffer (F-531S and F-531L) and with GC Buffer (F-532S and F-532L). The error rate of Phusion DNA Polymerase in HF Buffer (4.4 × 10-7) is lower than that in GC Buffer (9.5 × 10-7). Therefore, the master mix with HF Buffer should be used as the default master mix for high-fidelity amplification. However, GC Buffer can improve the performance of Phusion DNA Polymerase on some difficult or long templates, such as GC-rich templates or those with complex secondary structures.


• High fidelity (25X Taq)
• Fast PCR due to short extension times (15-30 s/kb)
• Robust performance, minimal optimization needed


• Amplification of difficult (GC-rich) templates
• High-fidelity PCR
• Cloning
• Template generation for sequencing
• Long-range PCR (up to 20 kb)
• Mutagenesis
• High throughput PCR

Using Phusion DNA Polymerases
Annealing rules for Phusion DNA Polymerases are different from many common DNA polymerases (such as Taq DNA polymerases). For optimal results, use our Tm calculator at

For Research Use Only. Not for use in diagnostic procedures.


Fidelity (vs. Taq): 25 X
GC-Rich PCR Performance: High
Hot Start: No
Includes: With GC Buffer
Overhang: Blunt
Polymerase: Phusion High-Fidelity DNA Polymerase
Product Line: Phusion
Quantity: 100 x 50uL Rxns
Reaction Format: SuperMix or Master Mix
Reaction Speed: Fast

Contents & storage

• 2 x 1.25 mL Phusion Master Mix with GC Buffer (2X) (provides 1.5 mM MgCl2 in final reaction)
• 1 x 500 μL 100% DMSO

Store at -20°C.