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Clipos™ Cyanur Liposomes, PEGylated

Catalog:CDEIMS-1530

Unit Size
Price
$1480

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Specifications QA & Reviews
Functional GroupCyanur
StorageShould always be stored at in the dark at 4 °C, except when brought to room temperature for brief periods prior to animal dosing. DO NOT FREEZE. If the suspension is frozen, the encapsulated drug can be released from the liposomes thus limiting its effectiveness. In addition, the size of the liposomes will also change upon freezing and thawing.
AppearanceWhite translucent liquid made of nano size unilamellar liposomes. Usually due to the small size of liposomes no settling will occur in the bottom of the vial. The liposomes are packaged in an amber vial.
DescriptionProteins can be covalently coupled to the liposomes via amine-reactive cyanur-groups, either directly to the vesicle surface using cyanuric chloride-activated DSPE (cyanur-DSPE) or to the distal ends of PEG-spacers using activated cyanur-PEG-PE (ammonium salt). Cyanuric chloride at the PEG terminus functions to link peptides, antibodies and other amine-containing biomolecules or nanoparticles via a nucleophilic substitution reaction under basic conditions. Antibodies or other proteins can be conjugated without any previous derivatization.
Lipid compositionHSPC/Cholesterol/DSPE-PEG(2000)/DSPE-PEG(2000)-Cyanur (57/38/4/1 molar ratio)
Liposome Size100 nm
Lipid Molar Concentration21.58 mM
BufferPhosphate Buffered Saline, pH 7.4
Shelf-life4 months.
Technical NotesEDC and sulfo-NHS should be prepared immediately before use and kept at room temperature. The activation reaction with EDC and Sulfo-NHS is most efficient at pH 4.5-7.2, and EDC reactions are often performed in at pH 4.7-6.0. For this reason, we have formulated the liposomes in PBS buffer and adjusted the pH to 6. Reaction of Sulfo-NHS-activated molecules with primary amines is most efficient at pH 7-8, and Sulfo-NHS-ester reactions are usually performed in phosphate-buffered saline (PBS) at pH 7.2-7.5. Tris buffer should never be used in any step of the process since it contains amine. If you are using a ligand or peptide that is hydrophobic then it is recommended to solubilize it in DMSO or DMF and then add the buffer to it. It is recommended not to use more than 5% volume of DMSO or DMF in the solution. DMF and DMSO are both compatible with liposomes and they are also miscible in water. Other organic solvent such as ethanol and chloroform are not compatible with liposomes and will cause the liposomes to lyse. If you end up using DMSO or DMF then after the conjugation reaction is done, you need to remove DMSO and DMF from the liposomes. In order to do that you need to use a dialysis cassette that is made from REGENERATED CELLULOSE MEMBRANE. NOTE: Not all membranes are compatible with DMF and DMSO. We recommend using a Slide-A-Lyzer? MINI Dialysis Device with MWCO of 2K made from regenerated cellulose membrane manufactured by ThermoFisher. After DMSO or DMF is removed, you can use Float-A-Lyzer? dialysis device for the final step of cleaning up the prep.
Lipid Mass Concentration15.92 mg/mL
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