UltraAvidin™ — Alexa Fluor® 647

UltraAvidin is Leinco Technologies' trademark for a uniquely modified form of avidin which is isolated from chicken egg whites. With a molecular weight of 60,000 there are four identical subunits each capable of binding one molecule of biotin. UltraAvidin from Leinco Technologies has been de-glycosylated to prevent carbohydrate moieties from adhering to lectin-like receptors on the surface of cells, thus eliminating the possibility of false positives. Unlike native avidin, UltraAvidin has a near neutral pI which prevents electrostatic interactions with negatively charged serum or membrane proteins.

This Alexa Fluor® 647 conjugate is formulated in 0.01 M phosphate buffered saline (150 mM NaCl) PBS pH 7.4, 1% BSA and 0.09% sodium azide as a preservative.
Alexa Fluor® is a trademark of Life Technologies Corporation.

Western blotting: 1:5,000 - 1:10,000
ELISA: 1:5,000 - 1:20,000
Immunohistochemistry: 1:100 - 1:1,000
Western blotting and ELISA Chemiluminescent: 1:20,000 - 1:100,000

However, each investigator should determine their own optimal working dilution for each specific research application.

This Alexa Fluor® 647 conjugate is stable when stored at 2-8°C. Do not freeze.

2-8°C Wet Ice

1. Wilchek, M. et al. (1990) Biochem Biophys Res Commun. 170(3):1236-41.
2. Sullivan, W. et al. (1996) Genetics. 143(4):1629-42.