avidin
C2Technical, scientific
Definition
Meaning
A protein found in raw egg white that binds biotin (vitamin B7/H) and makes it unavailable, potentially causing deficiency.
A tetrameric glycoprotein in the albumen of bird, reptile, and amphibian eggs that acts as a biotin-binding antimicrobial agent. It is widely used in biotechnology and biochemistry due to its extremely strong and specific interaction with biotin.
Linguistics
Semantic Notes
Avidin is not a general descriptive term like 'avid' but a specific biochemical entity. Its name derives from its 'avid' binding of biotin. It is primarily discussed in contexts of nutrition, biochemistry, and laboratory techniques.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences; spelling and pronunciation are consistent. Usage is identical across scientific communities.
Connotations
Neutral technical term in both varieties.
Frequency
Extremely low frequency in general discourse, exclusive to scientific/technical contexts. Frequency is equal in UK and US scientific English.
Vocabulary
Collocations
Grammar
Valency Patterns
Avidin binds to biotin.The avidin in [source] causes [effect].[Substance] is conjugated with avidin.Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Virtually never used.
Academic
Used in biochemistry, molecular biology, nutrition, and food science papers and textbooks.
Everyday
Rarely used; might appear in articles about nutrition or cooking safety regarding raw eggs.
Technical
Core term in lab protocols (e.g., ELISA, immunohistochemistry) using avidin-biotin technology.
Examples
By CEFR Level
- Eating many raw eggs is not advised because they contain avidin.
- Avidin is a protein in egg white.
- Cooking eggs denatures avidin, preventing it from interfering with biotin absorption.
- The strong bond between avidin and biotin is useful in laboratory tests.
- Researchers exploited the high-affinity avidin-biotin interaction to develop a highly sensitive diagnostic assay.
- Nutritional biotin deficiency can be induced by a diet high in raw egg whites due to the presence of avidin.
Learning
Memory Aids
Mnemonic
Think: AVID for biotin + -IN (protein suffix). It's AVIDly binding IN egg white.
Conceptual Metaphor
A LOCK AND KEY (avidin is the lock, biotin is the key). A TRAP or SPONGE (capturing and holding biotin).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Не переводить описательно как "жадный белок". Это термин "авидин".
- Не путать с однокоренным прилагательным "avid" (страстный, увлеченный).
Common Mistakes
- Misspelling as 'avadin', 'aviden'.
- Using it as a general adjective (e.g., 'He was avidin for knowledge' - INCORRECT).
- Confusing it with the vitamin it binds (biotin).
Practice
Quiz
What is the primary functional property of avidin?
FAQ
Frequently Asked Questions
It is not toxic itself, but by binding dietary biotin, it can cause a biotin deficiency if large amounts of raw egg whites are consumed regularly.
Heat from cooking denatures (unfolds) the avidin protein, destroying its ability to bind biotin.
It is found in the egg whites of other birds, reptiles, and amphibians.
Its extremely strong and specific bond with biotin allows scientists to use it as a 'glue' to attach detection molecules (like fluorescent dyes) to specific targets in experiments.