70235 Sigma-AldrichBL21(DE3) Singles™ Competent Cells - Novagen
BL21(DE3) is a chemically competent E. coli cell suitable for transformation and high level protein expression using a T7 RNA polymerase-IPTG induction system.
More>> BL21(DE3) is a chemically competent E. coli cell suitable for transformation and high level protein expression using a T7 RNA polymerase-IPTG induction system. Less<<BL21(DE3) Singles™ Competent Cells - Novagen MSDS (material safety data sheet) or SDS, CoA and CoQ, dossiers, brochures and other available documents.
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Overview
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Pricing & Availability
| Catalogue Number | Availability | Packaging | Qty/Pack | Price | Quantity | |
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| 70235-3 |
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Glass bottle | 11 rxn |
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| 70235-4 |
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Glass bottle | 22 rxn |
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| Description | |
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| Overview | A common method for transformation of DNA plasmids into E. coli is the use of chemically competent cells. Although competent cells can be prepared in the laboratory, greater efficiency, reproducibility, and convenience are achieved using Novagen prepared competent cells. Novagen® Singles™ Competent Cells are designed for ultimate convenience and reliability in plasmid transformation. Chemically competent cells are prepared using an optimized method. Cells are provided in 50 µl volumes, eliminating the need to aliquot, freeze/thaw, or waste partially used vials, saving time and money and ensuring reliable cell performance. To use, simply thaw, add DNA, incubate 5 minutes on ice, heat shock for 30 seconds, place on ice for 2 minutes, and add SOC medium. T7 expression strains are lysogens of bacteriophage DE3, as indicated by the (DE3). These hosts carry a chromosomal copy of the T7 RNA polymerase gene under control of the lacUV5 promoter. Such strains are suitable for production of protein from target genes cloned in appropriate T7 expression vectors, using IPTG as an inducer. BL21 has been the gold standard for protein expression since it was first introduced in 1990. Deficient in lon and ompT proteases, BL21 and its derivatives are ideal for many applications. |
| Genotype: F– ompT hsdSB (rB– mB–) gal dcm (DE3)
This product contains genetically modified organisms (GMO). Within the EU GMOs are regulated by Directives 2001/18/EC and 2009/41/EC of the European Parliament and of the Council and their national implementation in the member States respectively. This legislation obliges MilliporeSigma to request certain information about you and the establishment where the GMOs are being handled. Click here for Enduser Declaration (EUD) Form. This product is sold for internal research use only. Any commercial use of this product, its components, and/or any derivatives thereof (including but not limited to proteins produced using the product or its components) (together and hereinafter the 'EMD Product') requires signature of a written commercial use agreement with EMD Millipore Corporation or its successor-in-interest. Commercial use shall include but not be limited to: (1) use of the EMD Product to manufacture products for sale to third parties; (2) use of the EMD Product to provide services, information, or data to third parties in exchange for consideration; (3) use of the EMD Product for therapeutic, diagnostic or prophylactic purposes (including as part of a device, chip, assay or other product); or (4) resale of the EMD Product, whether or not such EMD Product is resold for research use. Nothing contained herein shall be deemed to represent or warrant that additional third party rights are not required for use of the EMD Product. Please direct any questions on these use restrictions to: licensing@milliporesigma.com. |
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| Catalogue Number | 70235 |
| Brand Family | Novagen® |
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| Product Information | ||
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| • | 11 rxn or 22 rxn | BL21(DE3) Singles Competent Cells |
| • | 2 or 4 × 2 ml | SOC Medium |
| • | 10 µl | Test Plasmid |
| Genotype | F– ompT hsdSB (rB– mB–) gal dcm (DE3) | |
| Guaranteed efficiency | Guaranteed efficiency: > 2 x 10⁷ cfu/μg | |
| Quality Level | MQ100 | |
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| Ship Code | Dry Ice Only |
| Toxicity | Multiple Toxicity Values, refer to MSDS |
| Storage | ≤ -70°C |
| Avoid freeze/thaw | Avoid freeze/thaw |
| Do not freeze | Ok to freeze |
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| Specifications |
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| Global Trade Item Number | |
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| Catalogue Number | GTIN |
| 70235-3 | 04055977258578 |
| 70235-4 | 04055977258585 |
Documentation
BL21(DE3) Singles™ Competent Cells - Novagen SDS
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BL21(DE3) Singles™ Competent Cells - Novagen Certificates of Analysis
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| 70235 |
Brochure
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| The Complete Molecular Biology Toolkit - Expert workflow solutions from DNA cloning to protein expression |
Citations
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User Protocols
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| TB009 Competent Cells |
| TB053 Academic and Non-profit Laboratory Assurance Letter |
| TB055 pET System Manual |