Method and system for capture and use of intact vesicles on electrodeposited hydrophobically modified biopolymer films

• US 8,858,883 B2
• Filed: 12/02/2011
• Issued: 10/14/2014
• Est. Priority Date: 12/02/2010
• Status: Active Grant

• Current Assignee: University of Maryland, College Park, Wichita State University
• Original Assignee: University of Maryland, College Park, Wichita State University
• Inventors: Dowling, Matthew, Raghavan, Srinivasa R., Dashaputre, Neeraja, English, Douglas Stephen, Javvaji, Vishal, Payne, Gregory F., DeShong, Philip R.
• Primary Examiner(s): Sines, Brian J
• Application Number:
  US13/310,579
• Publication Number:
  US 20120252703A1
• Time in Patent Office: 1,047 Days
• Field of Search: 422/50, 422/68.1, 436/43
• US Class Current: 422/68.1
• CPC Class Codes: A61F 13/00063 comprising medicaments or additives, e.g. odor control, PH control, debriding, antimicrobic drug delivery dressings A61K9/70; chemical aspect of the additives A61L15/00
• CPC Class Codes: A61F 13/01017 synthetic, e.g. polymer based
• CPC Class Codes: A61L 15/28 Polysaccharides or their derivatives A61L15/225 takes precedence
• CPC Class Codes: A61L 15/44 Medicaments
• CPC Class Codes: A61L 2300/104 Silver, e.g. silver sulfadiazine
• CPC Class Codes: A61L 2300/404 Biocides, antimicrobial agents, antiseptic agents
• CPC Class Codes: A61L 2300/406 Antibiotics
• CPC Class Codes: A61L 2300/414 Growth factors
• CPC Class Codes: A61L 2300/626 Liposomes, micelles, vesicles
• CPC Class Codes: C08L 5/08 Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
• CPC Class Codes: G01N 33/5432 Liposomes or microcapsules
• CPC Class Codes: G01N 33/5436 with ligand physically entrapped within the solid phase liposomes G01N33/5432; immunological test elements G01N33/54386
• CPC Class Codes: G01N 33/5438 Electrodes
• CPC Class Codes: G01N 33/548 Carbohydrates, e.g. dextran
• CPC Class Codes: Y10T 436/11 Automated chemical analysis

Abstract

A biosensor comprising an electrically conductive substrate coated with a modified chitosan biopolymer that has been electrodeposited on the substrate, wherein said modified chitosan biopolymer comprises at least one vesicle binding molecule. The biosensor is manufactured by a method where a modified chitosan biopolymer is electrodeposited on a substrate. The method is also used to manufacture a modified chitosan biopolymer film by electrodeposition of the chitosan on the substrate and later removing the film from the substrate after electrodeposition. The resulting film can be used in bandages to treat various types of wounds. The biosensor can also be used to detect various analytes in samples.

Claims

1. A biosensor, comprising:

an electrically conductive substrate coated with a hyropbobically-modified chitosan biopolymer comprising at least one vesicle binding molecule;

wherein the biopolymer has been electrodeposited on the substrate.

2. The biosensor of claim 1, wherein the modified chitosan electrodeposited on the substrate is selected from the group consisting of modified chitosan chloride, modified chitosan lactate, modified chitosan salicylate, modified chitosan pyrrolidone carboxylate, modified chitosan itaconate, modified chitosan niacinate, modified chitosan formate, modified chitosan acetate, modified chitosan gallate, chitosan glutamate, modified chitosan maleate, modified chitosan aspartate, modified chitosan glycolate and quaternary amine substituted chitosan and salts thereof.

3. The biosensor of claim 1, wherein the vesicle binding molecule is a hydrophobic molecule or a molecule that recognizes a specific receptor on the vesicle'"'"'s membrane.

4. The biosensor of claim 1, wherein the substrate is an electrode.

5. The biosensor of claim 4, wherein the electrode is selected from the group consisting of gold, silver, copper, platinum, palladium, Indium Tin Oxide (ITO) coated glass, and Tin Dioxide (SnO₂) coated class electrodes.

6. The biosensor of claim 4, wherein the electrode is on a chip.

7. The biosensor of claim 5, wherein the chip is made of a material selected from the group consisting of silicon, copper oxide, germanium, gallium arsenide and grapheme.

8. The biosensor of claim 1, further comprising at least one vesicle.

9. The biosensor of claim 7, wherein the vesicle comprises a biological marker.

10. The biosensor of claim 9, wherein the biological marker is selected from the group consisting of biotin, streptavidin, oligosaccharides, fluorescent markers.

11. The biosensor of claim 1, wherein the substrate further comprises at least two electrode addresses.

12. The biosensor of claim 11, wherein at least one of said at least two electrode addresses is coated with a first modified chitosan biopolymer that is different from a second modified chitosan biopolymer that coats another of said at least two electrode addresses.

13. The biosensor of claim 11, wherein said first modified chitosan binds a first type of vesicle, while said second modified chitosan biopolymer binds a second type of vesicle.

14. A method of manufacturing a biosensor, comprising:

electrodepositing a hydrphobically-modified chitosan biopolymer on a substrate by applying voltage to the substrate, wherein the biopolymer is capable of coating the substrate upon application of electricity and wherein the modified chitosan biopolymer comprises at least one vesicle binding molecule.

15. The method of claim 14, wherein prior to said electrodepositing step the substrate is placed in a solution of the modified chitosan polymer.

16. The method of claim 15, wherein the chitosan is a modified chitosan salt selected from the group consisting of modified chitosan chloride, modified chitosan lactate, modified chitosan salicylate, modified chitosan pyrrolidone carboxylate, modified chitosan itaconate, modified chitosan niacinate, modified chitosan formate, modified chitosan acetate, modified chitosan gallate, modified chitosan glutamate, modified chitosan maleate, modified chitosan aspartate, modified chitosan glycolate and quaternary amine substituted modified chitosan and salts thereof.

17. The method of claim 14, further comprising the step of attaching at least one vesicle to the biopolymer.

18. The method of claim 14, wherein the substrate comprises at least two electrode addresses.

19. The method of claim 18, further comprising the step placing the substrate in a solution containing a first type of modified chitosan biopolymer and applying voltage to a first set of electrode addresses in order to coat the first set of electrode addresses with the first type of modified chitosan biopolymer.

20. The method of claim 19, further comprising the step placing the substrate in a solution containing a second type of modified chitosan biopolymer and applying voltage to a second set of electrode addresses in order to coat the second set of electrode addresses with the second type of modified chitosan biopolymer.