# US 7,411,038 B2 · Artificial red blood cells

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- Number: US 7,411,038 B2
- Document ID: US7411038B2
- Status: Granted
- Kind: B2
- Application number: 11/433,259
- Filed: 2006-05-12
- Published: 2006-09-14
- Granted: 2008-08-12
- Earliest claimed: 2003-08-29
- Assignees: Louisiana Tech University Foundation, Inc.
- Inventors: Donald T. Haynie
- Web page: https://patentgrep.com/patent/US7411038B2

## CPC

- G01N 33/6803: {General methods of protein analysis not limited to specific proteins or families of proteins}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

An artificial red blood cells are disclosed comprising a thin film encapsulating a core, the core comprising hemoglobin, wherein the film comprises a plurality of layers of polypeptides, opposing layers comprising alternating oppositely charged polypeptides, and wherein at least half of the amino acid residues in the oppositely charged polypeptides have the same charge. In one embodiment, a first layer comprises a first layer polypeptide comprising one or more first amino acid sequence motifs, wherein the one or more amino acid sequence motifs consist of n amino acids, at least x of which are positively charged, or at least x of which are negatively charged, wherein x is greater than or equal to approximately one-half of n.

## Claims

### Claim 1

An encapsulated hemoglobin comprising:
a thin film encapsulating a core particle, the core particle comprising hemoglobin,
wherein the film comprises a plurality of layers of polypeptides,
wherein adjacent layers are oppositely charged polypeptides,
wherein a first layer of the film comprises a first layer polypeptide,
wherein the first layer polypeptide is at least 15 amino acid residues long, has a balance of charge at pH 7 greater than or equal to approximately one-half of its total length and comprises one or more first amino acid sequence motifs,
wherein each of the first amino acid sequence motifs has a length of 5 to 15 amino acid residues and a balance of charge at pH 7 greater than or equal to approximately one-half of its length.

### Claim 2 (depends on 1)

The encapsulated hemoglobin_artificial red blood cell of claim 1, wherein the first amino acid sequence motif is found in the primary structure of a human blood protein.

### Claim 3 (depends on 2)

The encapsulated hemoglobin of claim 2, wherein the human blood protein is complement C3, or lactotransferrin.

### Claim 4 (depends on 1)

The encapsulated hemoglobin of claim 1, wherein the hemoglobin is in liquid form or in crystallized form.

### Claim 5 (depends on 1)

The encapsulated hemoglobin of claim 1, wherein the first amino acid sequence motif comprises a cysteine residue.

### Claim 6 (depends on 1)

The encapsulated hemoglobin of claim 1, comprising a second layer disposed on the first layer,
wherein the second layer comprises a second layer polypeptide,
wherein the second layer polypeptide is at least 15 amino acid residues long, has a balance of charge at pH 7 greater than or equal to approximately one-half of its total length and of opposite polarity to that of the first layer polypeptide, and comprises one or more second amino acid sequence motifs,
wherein each of the second amino acid sequence motifs has a length of 5 to 15 amino acid residues, and a balance of charge at pH 7 greater than or equal to approximately one-half of its length.

### Claim 7 (depends on 1)

The encapsulated hemoglobin of claim 1, wherein the core particle further comprises a superoxide dismutase, a catalyse, a methemoglobin reductase, or a combination comprising one or more of the foregoing molecules.

### Claim 8 (depends on 1)

The encapsulated hemoglobin of claim 1, wherein the first layer polypeptide is biocompatible.

### Claim 9 (depends on 1)

The encapsulated hemoglobin of claim 1, wherein the encapsulated hemoglobin further comprises a layer which is not a polypeptide.

### Claim 10 (depends on 1)

The encapsulated hemoglobin of claim 1, wherein the first layer polypeptide is not a homopolyrner.

### Claim 11 (depends on 1)

The encapsulated hemoglobin of claim 1, wherein the second layer polypeptide is not a homopolyrner.