JBS Bright Red
Eosin Scarlet
Catálogo Nº | Apresentação | Preço (R$) | Comprar / Observação |
---|---|---|---|
CO-304 | 300 μl | Sob demanda | Adicionar ao Carrinho |
Unstained (A) and stained (B) protein crystals
For general laboratory use.
Envio: shipped at ambient temperature
Condições de armazenamento: store at ambient temperature
Validade: 12 months
Fórmula molecular: C20H6Br2N2Na2O9
Peso molecular: 624.08 g/mol
CAS#: 548-24-3
Número CE: 208-943-1
Formulários:
JBS Bright Red is a crystal dye used to stain macromolecular crystals, i.e. protein, peptide and nucleic acid crystals in order to differentiate them from small molecules and salt crystals.
Descrição:
Crystallization screening with high concentrations of precipitant and salt may lead to the formation of salt crystals. It is quite difficult to make a distinction between these false positives and true protein crystals.
Staining of crystals with appropriate dyes is a very straightforward method to differentiate between macromolecular crystals and salt crystals [1].
Protein and salt crystals differ substantially in their solvent content. Small crystal dyes, like JBS Bright Red, are able to permeate the solvent channels of a protein, thus coloring the protein red. In contrast, salt crystals are tightly packed and do not possess large solvent channels. They will therefore remain colourless.
Usage:
Simply add 0.5-1 μl of JBS Bright Red to the crystallization drop containing the crystals of interest.
Coloring Time:
JBS Bright Red colors protein crystals after a few minutes. Even if the color of the solution is only faintly red under the microscope, proteins will be stained within 5-15 min.
Very occasionally, it has been reported that protein crystals did not absorb crystal dyes [2].
Referências selecionadas:
[1] Wilkosz et al. (1995) Preliminary characterization of EcoRI-DNA co-crystals: incomplete factorial design of oligonucleotide sequences. Acta Cryst. D 51:938.
[2] Eckert et al. (2003) Crystallization and preliminary X-ray analysis of Alicyclobacillus acidocaldarius endoglucanase CelA. Acta Cryst. D 59:139.