amino group: meaning, definition, pronunciation and examples
C2Technical / Scientific
Quick answer
What does “amino group” mean?
A functional group in chemistry consisting of a nitrogen atom bonded to two hydrogen atoms (-NH₂).
Audio
Pronunciation
Definition
Meaning and Definition
A functional group in chemistry consisting of a nitrogen atom bonded to two hydrogen atoms (-NH₂).
The basic, nitrogen-containing functional group found in amino acids, amines, and many other organic compounds. It acts as a base, accepting protons due to the lone pair on the nitrogen atom.
Dialectal Variation
British vs American Usage
Differences
No differences in meaning or usage. Pronunciation is standard across scientific communities.
Connotations
Purely scientific term with no regional connotations.
Frequency
Equal frequency in technical texts in both regions.
Grammar
How to Use “amino group” in a Sentence
The amino group in X reacts with Y.X contains a reactive amino group.The amino group is protected.A proton is added to the amino group.Vocabulary
Collocations
Examples
Examples of “amino group” in a Sentence
verb
British English
- The chemist sought to amino-methylate the aromatic ring.
American English
- Researchers aim to amino-acylate the polymer backbone.
adverb
British English
- The molecule reacted amino-specifically.
American English
- The reagent binds amino-selectively.
adjective
British English
- The amino-group-containing compound was purified.
- The amino-group protection step is critical.
American English
- The amino-group functionality was confirmed by NMR.
- An amino-group modification was performed.
Usage
Meaning in Context
Business
Virtually never used.
Academic
Used in chemistry, biochemistry, pharmacology, and materials science papers and textbooks.
Everyday
Not used in everyday conversation.
Technical
The primary context. Describes a fundamental chemical structure in organic synthesis, drug design, and protein chemistry.
Vocabulary
Synonyms of “amino group”
Strong
Neutral
Weak
Vocabulary
Antonyms of “amino group”
Watch out
Common Mistakes When Using “amino group”
- Misspelling as 'ammino group' or 'ammino group'.
- Incorrectly referring to it as an 'amine' (an amine is a compound *containing* an amino group).
- Confusing it with the 'amide group' (-CONH₂).
FAQ
Frequently Asked Questions
No. An 'amino group' (-NH₂) is a functional group. An 'amine' is an organic compound that *contains* one or more amino groups attached to a carbon backbone (e.g., methylamine, CH₃NH₂).
It is a key component of amino acids, the building blocks of proteins. The amino group allows amino acids to link together via peptide bonds and contributes to the structure and function of proteins and many vital biomolecules.
Yes. Amino groups are found in many other compounds, including neurotransmitters (like dopamine), drugs (like many antibiotics), dyes, plastics (like nylon), and fertilizers (like urea).
It is pronounced /əˈmiːnəʊ/ (UK) or /əˈmiːnoʊ/ (US), with the stress on the second syllable: a-MEE-no. It is not pronounced like the food term 'amino' in 'amino acids' heard in fitness contexts, which is often pronounced /ˈæmɪnəʊ/ (AM-i-no).
A functional group in chemistry consisting of a nitrogen atom bonded to two hydrogen atoms (-NH₂).
Amino group is usually technical / scientific in register.
Phrases
Idioms & Phrases
- “None. This is a technical term.”
Learning
Memory Aids
Mnemonic
Think of 'a-me-No' group: A (atom) Me (for methyl? No!) — It's actually a Nitrogen atom with two Hydrogens (NH₂).
Conceptual Metaphor
Often conceptualized as a 'handle' or 'hook' on a molecule that can be used for linking or as a site of chemical reactivity.
Practice
Quiz
What is the chemical formula of a primary amino group?