Multimeric biotinidase resistant multimodality probes

1. A biotinidase resistant contrast agent having a formula selected from the group consisting of:

L 1 , L 2 , L 3 , L 4 , L 5 and L 6 are linkers,

R 2 is a functional group, wherein said functional group is independently selected from alkyl, alkenyl, alkynyl, phenyl, benzyl, halo, hydroxyl, carbonyl, aldehyde, carboxylate, ester, ether, amine, nitro, nitrile, and pyridyl,

IRDye is a near infrared dye with wavelength in the range of 700-900 nm, and

is a metal chelate.

2. The biotinidase resistant contrast agent of claim 1 , wherein said linkers are selected from the group consisting of alkane, amino acid, —NHCO(CH 2 ) 5 —, polyethylene glycol, and polypropylene glycol.

3. The biotinidase resistant contrast agent of claim 1 , wherein said near infrared dye is selected from the group consisting of IRDye 78, IRDye 800CW, IRDye 700DX, VivoTag-S 750, VivoTag 800, VivoTag-S 680, DY-750, DY-682, DY-675, Cypate, Alexa Fluor 750, and Alexa Fluor 680.

4. A method of making a biotinidase resistant contrast agent, said method comprising:

providing an organic chelating ligand, wherein said organic chelating ligand selected from the group of:

wherein R is t-buty ester, ester, or hydrogen;

reacting said organic chelating ligand with a trifunctional linker moiety to result in a trifunctional linker moiety conjugated organic chelating ligand;

deprotecting one or more functional groups on said trifunctional linker moiety conjugated organic chelating ligand to yield one or more free functional groups;

chelating a metal ion on said one or more free functional groups to result in a metal chelate;

conjugating a near infrared fluorophore with said metal chelate to result a near infrared dye containing metal chelate conjugated carboxylic acid precursor;

providing a multivalent scaffold, wherein said multivalent scaffold is selected from the group of:

conjugating said multivalent scaffold with a biotinidase resistant targeting ligand to yield one or more biotinidase resistant targeting ligands conjugated multivalent scaffold;

deprotecting an amino protecting group on said one or more biotinidase resistant targeting ligands conjugated multivalent scaffold to obtain an amine containing biotinidase resistant targeting ligand conjugated multivalent scaffold; and

reacting said amine containing biotinidase resistant targeting ligand conjugated multivalent scaffold with said near infrared dye containing metal chelate conjugated carboxylic acid precursor to result in said biotinidase resistant contrast agent.

5. The method of claim 4 , wherein said trifunctional linker moiety is amino acid, polymer, or dendrimer.

6. The method of claim 4 , wherein said near infrared fluorophore is selected from the group consisting of IRDye 78, IRDye 700DX, VivoTag-S 750, VivoTag 800, VivoTag-S 680, DY-750, DY-682, DY-675, Cypate, Cy7, Alexa Fluor 750, and Alexa Fluor 680.

7. The method of claim 4 , wherein said metal ion is selected from the group consisting of Cu, Fe, In, Mn, Tm, Yb, Y, Gd, Eu, and a lanthanide.

8. The method of claim 4 , wherein said metal ion and said near infrared fluorophore are conjugated for concurrent magnetic resonance and near infrared optical imaging.

9. The method of claim 4 , wherein said metal ion and said near infrared fluorophore are conjugated for concurrent nuclear and near infrared optical imaging.

10. The method of claim 4 , wherein said biotinidase resistant targeting ligand is selected from the group consisting of

L 4 and L 5 are linking moiety,

and

R 3 is independently selected from alkyl, alkenyl, allynyl, phenyl, benzyl, halo, hydroxyl, carbonyl, aldehyde, carboxylate, ester, ether, amine, nitro, nitrile, and pyridyl.

11. A method of making a biotinidase resistant contrast agent, said method comprising:

reacting a near infrared dye with a trifunctional linker moiety to result in a trifunctional linker moiety conjugated near infrared dye;

deprotecting an amino protecting group on said trifunctional linker moiety conjugated near infrared dye to result in an amino trifunctional linker moiety conjugated near infrared dye;

providing an organic chelating ligand, wherein said organic chelating ligand selected from the group of:

reacting said organic chelating ligand with said amino trifunctional linker moiety conjugated near infrared dye to result in a near infrared dye containing organic ligand conjugated carboxylic acid precursor;

deprotecting one or more functional groups on said near infrared dye containing organic ligand conjugated carboxylic acid precursor to yield one or more free functional groups;

chelating a metal ion on said one or more free functional groups to result in a near infrared dye containing metal chelate conjugated carboxylic acid precursor;

providing a multivalent scaffold, wherein said multivalent scaffold is selected from the group of:

conjugating said multivalent scaffold with a biotinidase resistant targeting ligand to yield one or more biotinidase resistant targeting ligands conjugated multivalent scaffold;

deprotecting an amino protecting group on said one or more biotinidase resistant targeting ligands conjugated multivalent scaffold to obtain an amine containing biotinidase resistant targeting ligand conjugated multivalent scaffold; and

reacting said amine containing biotinidase resistant targeting ligand conjugated multivalent scaffold with said near infrared dye containing metal chelate conjugated carboxylic acid precursor to result in said biotinidase resistant contrast agent.

12. The method of claim 11 , wherein said trifunctional linker moiety is amino acid, polymer, or dendrimer.

13. The method of claim 11 , wherein said near infrared dye is selected from the group consisting of IRDye 78, IRDye 700DX, VivoTag-S 750, VivoTag 800, VivoTag-S 680, DY-750, DY-682, DY-675, Cypate, Cy7, Alexa Fluor 750, and Alexa Fluor 680.

14. The method of claim 11 , wherein said metal ion is selected from the group consisting of Cu, Fe, In, Mn, Tm, Yb, Y, Gd, Eu, and a lanthanide.

15. The method of claim 11 , wherein said biotinidase resistant contrast agent is in a form of pharmaceutically acceptable salts, hydrates, and solvates.

16. The method of claim 11 , wherein said biotinidase resistant targeting ligand is selected from the group consisting of:

L 4 and L 5 are linking moiety,

and

R 3 is independently selected from alkyl, alkenyl, alkynyl, phenyl, benzyl, halo, hydroxyl, carbonyl, aldehyde, carboxylate, ester, ether, amine, nitro, nitrile, and pyridyl.

17. The method of claim 11 , wherein said a biotinidase resistant targeting ligand is reacted with said near infrared dye containing metal chelate conjugated carboxylic acid precursor to obtain said biotinidase resistant contrast agent.