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Description
TCI D2226, cis-4,7,10,13,16,19-docosahexaenoic acid, commonly known as DHA, is a long-chain polyunsaturated fatty acid carrying six double bonds in the cis configuration. In this catalogue it is classified as a colloidal quantum dot (QD) research reagent, because long-chain fatty acids play an essential role as surface ligands and as growth-controlling agents in the synthesis of nanocrystals. DHA is also widely recognised in lipid biochemistry and nutrition research as an omega-3 fatty acid, so this single material serves two distinct research pathways in the modern laboratory.
The property that makes DHA a preferred choice is the combination of a surface-binding carboxylate group with a long, highly flexible hydrocarbon chain. The carboxylate group is able to coordinate to the surface of both metal and semiconductor nanocrystals, stabilising the particles so that they do not aggregate, while the multiply unsaturated chain contributes flexibility and prevents tight, ordered packing, so that dispersion in non-polar solvents is maintained. The large number of cis double bonds gives the molecule a pronounced curvature and makes it reluctant to crystallise, but the same feature makes it sensitive to oxygen, light and heat.
In Indonesian laboratories this reagent is typically used in university and institutional research groups working on nanomaterials and electronic materials, where it is introduced as a capping ligand during colloidal synthesis and purification steps. It is equally at home in lipid biochemistry and nutrition laboratories that study omega-3 fatty acids. Because the material is oxidation-sensitive, it is normally kept as a cold-stored reference reagent and dispensed in small portions as individual experiments require.
Laboratory Applications
- Colloidal quantum dot synthesis: the carboxylate head group binds the growing nanocrystal surface, controlling particle growth and preventing uncontrolled aggregation during the reaction.
- Surface ligand and capping studies: the long unsaturated chain resists tight packing, so researchers can examine how ligand flexibility influences nanocrystal surface coverage and passivation.
- Nanocrystal dispersion in non-polar media: the extended hydrocarbon tail provides steric stabilisation that keeps particles suspended and optically clear in organic solvents.
- Ligand exchange experiments: DHA serves as a well-defined long-chain fatty acid comparator when studying how different carboxylic acid ligands displace one another on nanocrystal surfaces.
- Lipid biochemistry and nutrition research: as a recognised omega-3 fatty acid, DHA is used as a reference material in studies of polyunsaturated fatty acid chemistry and behaviour.
Specifications
- Brand: TCI
- CAS number: 6217-54-5
- Category: Materials Science > Electronic Materials > Colloidal Quantum Dot (QD) Research Reagents
- Pack sizes: available in the manufacturer's standard catalogue pack sizes; please refer to the current product listing
- Physical form: long-chain polyunsaturated fatty acid that does not crystallise readily; refer to the product label for the form as supplied
- Storage: oxidation-sensitive material requiring cold, dark storage as indicated on the manufacturer's label
Handling and Storage
Because the many cis double bonds make this compound sensitive to oxygen, light and heat, it should be stored cold and in the dark, following the storage condition stated on the manufacturer's label. Keep the material in tightly closed, light-protected containers such as amber glass, and where possible blanket the headspace with an inert gas after each use to limit oxidation. Allow chilled containers to reach ambient temperature before opening to avoid moisture condensation. Dispense in a fume hood using clean, dry glassware and solvent-compatible tools, wear gloves, safety glasses and a laboratory coat, avoid contact with oxidising agents and ignition sources, and take out only the quantity needed for immediate use. Record opening dates so that ageing stock can be identified.
