How can you identify citric acid from FTIR?
This page summarizes the recurring FTIR evidence reported for citric acid, including the most frequent peaks, supporting functional groups, and literature-backed interpretation patterns. It is a structured evidence page, not a claim of automatic single-spectrum certainty.
Backed by 12 cited sources
Quick answer
citric acid is usually reported with a recurring pattern of peaks and functional-group evidence. The most useful approach is to cross-check at least two characteristic peaks before treating it as a match, then verify whether the full spectrum still fits the same material family.
Peak interpretation
Possible materials / groups
| Functional group | Evidence |
|---|---|
| Methacrylate | 13 |
| Acetate | 13 |
| Carboxyl (COOH) | 9 |
| Methoxy (OCH3) | 9 |
| C-O single bond | 9 |
| Ester | 8 |
| Carbonyl (C=O) | 7 |
| Hydroxyl (O-H) | 5 |
Spectrum logic
The logic here is evidence aggregation: repeated literature mentions of citric acid, repeated peak positions, and repeated functional-group associations. A strong material hypothesis should still be supported by multiple peaks that agree with each other, not by one headline band alone.
Real-world usage
This page is designed for polymer identification, incoming-material QC, unknown plastic analysis, recycled-content review, and literature-backed interpretation of reference spectra.
Common mistakes
- Calling a material match too early because one famous peak is present.
- Ignoring sample prep, fillers, oxidation, water, or additives that can change the apparent pattern.
- Using literature evidence without checking whether your own sampling mode and spectrum quality are comparable.
Verification advice
Use DSC, GC-MS, or TGA to validate the material hypothesis when the peak pattern is ambiguous or mixed.
Literature behind this page
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confidence 4.0
citric acid
Kasar 等 - 2015 - Speciation of citric acid on anatase (TiO2)-water DOI: 10.1515/ract-2014-2320) -
confidence 4.0
citric acid
Optimization of an extrusion cooking process to increase formation of resistant starch from corn starch with addition of citric acid DOI: 10.1002/star.201900150. -
confidence 4.0
citric acid
Rilda 等 - 2021 - Enhancement of antifungal capability of cotton tex DOI: 10.1080/01932691.2020.1724797 -
confidence 4.0
citric acid
Cai 等 - 2019 - Investigation on Reaction Sequence and Group Site DOI: 10.3390/polym11122071 -
confidence 4.0
citric acid
Guo 等 - 2019 - Modification of Scots Pine with Activated Glucose DOI: 10.1002/pola.21535 -
confidence 4.0
citric acid
Physico-Mechanical and Biological Durability of Citric Acid-Bonded Rubberwood Particleboard DOI: 10.3390/polym13010098 -
confidence 4.0
citric acid
Janusz 等 - 2020 - Synthesis of citrates of selected lanthanides (Er, DOI: 10.37190/ppmp/128739 -
confidence 4.0
citric acid
Investigations of the Chemical Distribution in Sorbitol and Citric Acid (SorCA) Treated Wood—Development of a Quality Control Method on the Basis of Electromagnetic Radiation DOI: 10.3390/f13020151 -
confidence 4.0
citric acid
Preparation and properties of jute stick particleboard using citric acid–glycerol mixture as a natural binder DOI: 10.1186/s10086-022-02039-0 -
confidence 2.5
citric acid
Wyrzykowski 等 - 2011 - Thermal behaviour of citric acid and isomeric acon DOI: 10.1007/s10973-010-1015-2
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