Characterization of impurities in adeno-associated virus (AAV) samples and formulation compositions to stabilize AAV
Methods for characterizing DNA impurities in adeno-associated virus (AAV) samples or biopharmaceuticals are provided including the use of size exclusion chromatography and spectrophotometry. Methods and compositions are also provided to minimize leakage of packed DNA from AAV vector including the use of excipients, such as a sugar, an amino acid, a surfactant, or polyols.
1 . A method for protecting an adeno-associated virus (AAV) vector from leaking packed nucleic acids, comprising:
obtaining a sample including at least one AAV vector; and
adding to said sample a stabilizing composition to form a protective formulation,
wherein the protective formulation protects at least one AAV vector from leaking packed nucleic acids, wherein the stabilizing composition comprises concentrations of 2.5% to 10% sucrose and 0.001% to 0.2% poloxamer 188 in DPBS, wherein reduction in ssDNA leakage is between 10- and 20-fold as measured by fluorescent-based free DNA assay, and reduction of ssDNA impurity peak area is 3- to 10-fold.
2 . The method of claim 1 , wherein the AAV vector is exposed to at least one freeze-thaw cycle.
3 . The method of claim 1 , wherein the packed nucleic acids are single-stranded DNA genome of AAV.
4 . The method of claim 1 , wherein sucrose is at concentration of 10%.
5 . The method of claim 1 , wherein poloxamer 188 is at a concentration of 0.1%.
6 . The method of claim 2 , wherein the AAV vector is exposed to 1 to 10 freeze-thaw cycles.