English | Chinese

Search form

Factor I

 For Research Use Only. Not for use in diagnostic procedures.

Purified human complement component Factor I. Factor I is a fluid phase complement regulatory enzyme. It consists of two peptide chains with molecular weights of 50 kD and 38 kD, respectively. Factor I is present in plasma at 35 mg/L. With Factor H, CR1 or C4 Binding Protein acting as a co factor, Factor I cleaves the C3b subunit of the alternative and classical pathway convertases, thereby inactivating them.

All Quidel complement components are tested for functional activity in a standard lytic or applicable functional assay and for biochemical purity by SDS-polyacrylamide gel electrophoresis. Please refer to the Certificate of Analysis for lot specific information on functional titer.

Quidel's purified human complement components are useful in a wide variety of immunochemical and research applications. For assistance with a specific protocol, please contact Quidel Technical Support.

Features & Benefits


Product Specifications

Product Spec NameProduct Spec Data

1.0 mg/mL


250 µL/vial


Room temperature (15°C to 30°C / 59°F to 86°F)


> 90%

Percent positive agreement*




Ordering Information

Catalog NumberKit Size / Case Size
250 µL/vial

Product Documentation

Product documentation is best viewed in Internet Explorer
PDF icon  SDS

By continuing to use this site you are agreeing to our use of cookies. For more details please see our Privacy and Cookie Notice.