商品编号


016-220-084



品牌


Jackson



公司


Jackson ImmunoResearch Laboratories



公司分类


Streptavidin and Conjugates



Conjugate

Cyanine Cy?2


Unit

1.0 mg


Product

Streptavidin


产地

美国

商品信息

Steptavidin, a bacterial protein isolated from
Streptomyces avidinii
, is similar to egg-white avidin in its
ABI
lity to bind biotin, and has been used as a replacement for egg-white avidin because of its more favorable chemical properties.
Conjugates of streptavidin are recommended for use with Biotin-SP-conjugated antibodies and Biotin-SP-conjugated ChromPure proteins.
Physical State:
Freeze-dried solid
Storage:

Store freeze-dried powder at 2-8°C. When ready to use, rehydrate with indicated volume of d. water and centrifuge if not clear. Product is stable for about 6 weeks at 2-8°C as an undiluted liquid. Prepare working dilution fresh each day. For extended storage after rehydration, add an equal volume of glycerol (ACS grade or better) for a final concentration of 50%, and store at -20°C as a liquid. Note: after the addition of glycerol, the concentration of protein and buffer salts is one-half of the original. Alternatively, aliquot and freeze the product at -70°C or below in the absence of glycerol. Avoid repeated freezing and thawing.
Expiration date:
one year from date of rehydration. However, the expiration date may be extended if the product is stored according to the recommendation and the test results are acceptable for its intended use.
Buffer:
0.01M Sodium Phosphate, 0.25M NaCl, pH 7.6
St
ABI
lizer:
15 mg/ml Bovine Serum Albumin (IgG-Free, Protease-Free)
Preservative:
0.05% Sodium Azide
Suggested Working Concentration or Dilution Range:
Western Blot:- 2-5 ?g / ml
Histo-/Cyto-Chemistry:-2-5 ?g / ml
Dilution factors are presented in the form of a range because the optimal dilution is a function of many factors, such as antigen density, perme
ABI
lity, etc. The actual dilution used must be determined empirically.
Cyanine Cy?2
Amax:
492
Emax:
510nm
Cy2 conjugates have maximum absorption/excitation at 492 nm and fluoresce with a peak around 510 nm in the green region of the vis
IBL
e spectrum like FITC conjugates (520 nm), but they are more photostable and less sensitive to pH changes than FITC. However, for mounting in aqueous media we recommend Alexa Fluor? 488 as the preferred green-fluorescing dye because it is brighter and more photostable than Cy2, FITC, and DyLight 488. A further disadvantage of using Cy2 with aqueous mounting media is its sensitivity to p-phenylenediamine, an anti-f
ADI
ng agent found in some commercial mounting media, which results in weak and diffused fluorescence after storage of stained slides. The main advantage of Cy2 conjugates is increased fluorescence in plastic mounting media.