How can you identify sodium alginate from FTIR?
This page summarizes the recurring FTIR evidence reported for sodium alginate, 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 37 cited sources
Quick answer
sodium alginate 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 |
|---|---|
| Hydroxyl (O-H) | 45 |
| Alkyl C-H | 39 |
| Methacrylate | 38 |
| C-O single bond | 38 |
| Acetate | 38 |
| Methoxy (OCH3) | 35 |
| Carboxyl (COOH) | 28 |
| Amide | 24 |
Spectrum logic
The logic here is evidence aggregation: repeated literature mentions of sodium alginate, 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 6.1
sodium alginate
Characterization of exopolysaccharides from floccular and aerobic granular activated sludge as alginate-like-exoPS DOI: 10.1080/19443994.2015.1052567 -
confidence 6.1
sodium alginate
Akiyode 和 Boateng - 2018 - Composite Biopolymer-Based Wafer Dressings Loaded DOI: 10.3390/polym10080918 -
confidence 6.1
sodium alginate
Design and Optimization of a Self-Assembling Complex Based on Microencapsulated Calcium Alginate and Glutathione (CAG) Using Response Surface Methodology DOI: 10.3390/polym13132080 -
confidence 6.1
sodium alginate
Chen 和 Hong - 2022 - Preparation of Chitin Composite Hydrogel for Dye-C DOI: 10.15244/pjoes/138210 -
confidence 6.1
Sodium alginate
El-Bana 等 - 2022 - MOLECULAR STRUCTURE AND OPTICAL ATTRIBUTES OF (Na- DOI: 10.4314/bcse.v36i3.19 -
confidence 6.1
sodium alginate
Preparation and Characterisation of Acid–Base-Change-Sensitive Binary Biopolymer Films with Olive Oil and Ozonated Olive Oil Nano/Microcapsules and Added Hibiscus Extract DOI: 10.3390/ijms241411502 -
confidence 6.1
sodium alginate
Lee 等 - 2013 - Preparation and Properties of Antimicrobial Zinc A DOI: 10.7317/pk.2013.37.6.677 -
confidence 6.1
sodium alginate
Characterization and Application in Packaging Grease of Gelatin–Sodium Alginate Edible Films Cross-Linked by Pullulan DOI: 10.3390/polym14153199 -
confidence 6.1
sodium alginate
Nagpal 等 - 2013 - Synthesis characterization and in vitro drug relea DOI: 10.4103/2230-973X.119215 -
confidence 6.1
sodium alginate
Curcumin encapsulated dual cross linked sodium alginate/montmorillonite polymeric composite beads for controlled drug delivery DOI: 10.1016/j.jpha.2020.07.002
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