Frequently Asked Questions

FAQ (& Facts about Streptavidin-PolyHRP and related SDT products)

1) What is PolyHRP? Which polymer is used in making enhanced PolyHRP label?
What makes PolyHRP different from competitor’s products?

2) What do 20, 40 and 80 in the names and codes of SA-PolyHRP conjugates stand

3) How many HRP molecules does one SA-PolyHRP conjugate have?

4) How many HRP molecules are in Aminoethyl-PolyHRP40?

5) How do compare detection power of the different SA-PolyHRP conjugates?

6) Which SA-PolyHRP should I take aiming at maximum sensitivity in ELISA?

7) What is the expected sensitivity level with PolyHRP (in double antibody
sandwich for an antigen)?

8) Which ImmunoPlates should I use when developing HS ELISA with PolyHRP

9) Which coating conditions are optimal for PolyHRP detection?

10) What is the best buffer applicable with SA-PolyHRP?

11) Why other blocking buffers and stabilizers are not recommended for
working with SA-PolyHRP?

12) What is the optimum dilution of SA-PolyHRP conjugates in ELISA?

13) Is SA-PolyHRP applicable in the assays on a microarray platform?

14) What is the difference between your SA1-HTS, SA1-HTS-E, SA1 and SA3-RHT stabilizers?

15) I obtain with SA-PolyHRP80 higher sensitivity in my ELISA for an antigen
but background also becomes larger. Is there any way to improve
signal-to-noise ratios? What should I do to optimize performance?

16) Despite the higher positive signals with SA-PolyHRP I also see an
increased background in my assay system. I saw no or less background when
I worked with a conventional, non-polymeric SA-HRP conjugate. What is the
reason for emerging background?

17) What is the lot to lot variability of the PolyHRP conjugates?

18) For the SA-POLYHRP40, do you mean it can be treated as a big molecule which consists of one
Streptavidin linked to a polyHRP40(40*5 HRP)? I am wondering what is the ratio of the SA to PolyHRP40? How is this ratio measured?

19) I have a question about the storage of #SP20C/#SP40C/#SP80C. Your CoA recommends
Storage: "-20°C (-15°C/-25°C). Do not store below -25°C!"
What is the implication for this storage requirement? Is product degraded below -20°C/ -25°C?

20) Would you be able to provide the molecular weights for the
Streptavidin-PolyHRP product line?

21) What is the average molecular weight of casein in the UCDB solution?
I experienced steric hinderance of my protein when I used BSA as a blocker so I wonder if casein is smaller than BSA or not.