391334

BES

ULTROL^® Grade, ≥99% dry basis (titration), zwitterionic N-substituted aminosulfonic acid buffer

• Synonym(e): BES, Free Acid, ULTROL^® Grade, N,N- bis-(2-Hydroxyethyl)-2-aminoethanesulfonic Acid
• Empirische Formel (Hill-System): C₆H₁₅NO₅S
• CAS-Nummer: 10191-18-1
• Molekulargewicht: 213.25
• UNSPSC Code: 12161700
• NACRES: NA.25
• MDL number: MFCD00007533

Eigenschaften

• Quality Level: 100
• assay: ≥99% dry basis (titration)
• form: solid
• manufacturer/tradename: Calbiochem^®
• storage condition: OK to freeze
• color: white
• pKa (20 °C): 7.12
• solubility: water: 1 mg/mL
• cation traces: heavy metals: ≤1 ppm
• shipped in: ambient
• storage temp.: 15-25°C
• SMILES string: [S](=O)(=O)([O-])CC[N+H](CCO)CCO
• InChI: 1S/C6H15NO5S/c8-4-1-7(2-5-9)3-6-13(10,11)12/h8-9H,1-6H2,(H,10,11,12)
• InChI key: AJTVSSFTXWNIRG-UHFFFAOYSA-N

Beschreibung

General description

Absorbance (100 mM, 260 nm):≤0.05.

BES buffer is suitable for use in systems where a calcium phosphate-DNA complex formation is desirable (Absorbance: <0.05 at 260 nm, 100 mM). Chen and Okayama describe an improved transfection system for the stable transformation of cells with plasmid DNA using BES buffer. The slow formation appears to be the most critical factor contributing to the high efficiency of stable transformations. Has a pK_a of 7.12 at 20°C.

Preparation Note

Following reconstitution, store in the refrigerator (4°C). Stock solutions are stable for up to 2 weeks at 4°C.

Other Notes

De Graeve, K.G., et al. 1994. J. Appl. Bacteriol. 76, 55.
Chen, C.A., and Okayama, H. 1988. Biotechniques6, 632.

Legal Information

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany

ULTROL is a registered trademark of Merck KGaA, Darmstadt, Germany

Disclaimer

Toxicity: Standard Handling (A)

Sicherheitshinweise

• Lagerklasse: 11 - Combustible Solids
• wgk: WGK 3
• flash_point_f: Not applicable
• flash_point_c: Not applicable