Alpha-Select Silver Efficiency

Cat No. Size List Price* Qty  
BIO-85026 2ml (10 x 200µl)
BIO-85046 1ml (20 x 50µl)
*For more information on pricing please contact us

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α-Select Silver Competent Cells are ideal for difficult clone construction and blunt-end ligation.

Features & Benefits

  • Reduced recombination of cloned DNA -designed to accommodates larger plasmids
  • High efficiency -available in ≥108 cfu/μg, perfect for difficult clones
  • Easy screening -with blue/white color selection
  • Convenient size -small aliquots reduce waste


  • Transformation of large plasmids into bacterial cells
  • Generating clones
  • Blue/white color screening


α-Select Silver Competent Cells are directly comparable to DH5α cells. They contain a lacZ marker that provides α-complementation of the ß-galactosidase gene for blue/white color screening and are ideal for difficult clone construction and blunt end ligation using plasmid-derived vectors.

α-Select Silver Competent Cells also provide recA1 and endA1 markers to minimize recombination and enhance the quality of the plasmid DNA, allowing efficient transformation even with large plasmids.

pUC19 DNA is also provided as a positive control.


Genotype: F- deoR endA1 recA1 relA1 gyrA96 hsdR17(rk-, mk+) supE44 thi-1 phoA Δ(lacZYA-argF)U169 Φ80lacZΔM15 λ-





Chemically Competent Cells

10 x 200µl

20 x 50µl

pUC19 control vector (10pg/µl)



Storage & Stability

All components should be stored at -80°C upon receipt for optimum stability. Repeated freeze/thaw cycles should be avoided.

When stored under the recommended conditions and handled correctly, full activity of the reagents is retained until the expiry date indicated on the outer box label.

Shipping conditions

Shipped on dry ice

Certificates of Analysis (COAs)

Certificates of Analysis for Alpha-Select Silver Efficiency are grouped by catalogue number and then listed by batch number. Larger pack sizes are listed first. To locate the COA for your product, first find the catalogue number and then the required batch number.

View all 13 COAs for Alpha-Select Silver Efficiency →

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