Definition of avidin in English:



mass nounBiochemistry
  • A protein found in raw egg white, which combines with biotin and hinders its absorption.

    • ‘The latter is due to the affinity of the egg white protein, avidin, for biotin preventing intestinal absorption of the biotin.’
    • ‘The endogeneous biotin was blocked by adding an excess amount of avidin followed by washing and addition of free biotin.’
    • ‘The reactivity could be weakened by pretreatment with avidin and biotin.’
    • ‘By cooking eggs, for example, you detoxify avidin, an egg-white protein that destroys biotin.’
    • ‘Groundwater, too, is protected from contamination because avidin is a biodegradable protein.’


1940s: from avid + -in.