For research use only. We do not sell to patients.
Ionizable lipids / 4A3-Cit
4A3-Cit chemical structure
Product imageResearch use only
CAT. NO. DC65001

4A3-Cit

Ionizable lipid for LNP and nucleic-acid delivery research.

Pack size & price

USD
TotalPrice on request
We match the best price and quality on market.
Ships from ShanghaiIce-pack transportPure lipid recommended
Product overview

Description & Application

4A3-Cit is an ionizable lipid used for the generation of lipid nanoparticles (LNPs). To investigate the role of unsaturated lipid tails in iLNPs, the nucleophilic amines were added to ester-based linkers, followed by Michael’s addition to the thiols to construct a library of 91 amino ionizable lipids. Such ionizable lipids were composed of an ionizable tertiary amine core, an ester-based degradable linker, and an alkylthiol tail periphery. Through in vitro and in vivo screening, the iLNPs with 4A3 core and citronellolbased (Cit) periphery can significantly increase endosome escape and delivery efficiency of mRNA, leading to 18-fold increase in protein expression compared with iLNPs without Cit periphery. Furthermore, the delivery efficiency of mRNA may be associated with the location/configuration of the unsaturated bond(s) in lipids. Although lipids with Cit periphery showed excellent membrane fusion ability to facilitate endosome escape, the fusion mechanism needs to be further clarified.

CAS No.Not available
Chemical Name4A3-Cit
Synonyms4A3Cit， 4A3 Cit
SMILESO=C(CCN(CCCN(CCCN(CCC(OCCOC(C(CSCCC(CC/C=C(C)/C)C)C)=O)=O)CCC(OCCOC(C(CSCCC(CC/C=C(C)/C)C)C)=O)=O)C)CCC(OCCOC(C(CSCCC(CC/C=C(C)/C)C)C)=O)=O)OCCOC(C(CSCCC(CC/C=C(C)\C)C)C)=O
FormulaC83H147N3O16S4
M.Wt1,571.33
Purity98%
StoragePure form: −20 °C, 1 year; In solvent: −80 °C, 6 months; −20 °C, 1 month. Sealed and protected from light.
Shipping conditionShips from Shanghai. Pure lipid is stable during ice-pack transport.
PublicationS. M. Lee, Q. Cheng, X. L. Yu, S. Liu, L. T. Johnson, D. J. Siegwart, Angew. Chem. Int. Ed. 2021, 60, 5848.
Laboratory planning

Solution Calculators

The product molecular weight is prefilled when available and remains editable. Confirm solvent compatibility and solubility before preparation.

Mass = concentration × volume × molecular weight
Enter any three values to calculate the fourth.
C₁V₁ = C₂V₂
Enter any three values to calculate the fourth.
Preparing stock solutions

Quick preparation table

Solvent volumes update from the molecular weight above.

Mass1 mM5 mM10 mM
10 mg6.3640 mL1.2728 mL636.40 μL
25 mg15.9101 mL3.1820 mL1.5910 mL
50 mg31.8202 mL6.3640 mL3.1820 mL
100 mg63.6404 mL12.7281 mL6.3640 mL
250 mg159.1009 mL31.8202 mL15.9101 mL

Need a different pack size or technical document?

Contact our team with the catalog number and requested quantity.

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Handling guidance

Shipping, storage and sampling

How is the lipid shipped, and how should I store it?
We generally ship the neat (undissolved) lipid compound rather than an ethanol solution. The neat lipid is stable during transport with ice packs, and shipments originate from Shanghai. Pure form: store at −20 °C for up to 1 year. In solvent: store at −80 °C for up to 6 months or at −20 °C for up to 1 month. Keep sealed and protected from light. Avoid repeated thaw cycles for best results.
Pure lipid or solution — which should I choose?
Pure lipid is generally more stable during shipping and storage, so we usually recommend the pure form. A solution in ethanol or chloroform can be supplied when required by your workflow. Tell us the intended application, solvent and target concentration so the most suitable format can be confirmed.
How should I measure a small amount of oily or viscous lipid?
Ionizable lipids are often oily liquids or viscous semisolids, so material can be lost during repeated weighing or transfer. For a small pack, dissolve the entire quantity and aliquot it volumetrically. For example, add 1 mL ethanol to 25 mg lipid to prepare a 25 mg/mL stock, then use a pipette to withdraw the required amount. For quantities above 100 mg, direct weighing with an analytical balance may be more practical. Always confirm solvent compatibility and solubility first.
Can you support formulation optimization and scale-up?
Yes. Share the RNA cargo, target tissue, administration route, formulation method and assay plan. Our team can discuss starting molar ratios, N/P ratio and scale-up requirements for research workflows.