# US 11,442,050 B2 · Aluminum ion detector, method of manufacturing the same, and aluminum ion detection method using the same

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- Number: US 11,442,050 B2
- Document ID: US11442050B2
- Status: Granted
- Kind: B2
- Application number: 16/540,374
- Filed: 2019-08-14
- Published: 2020-02-20
- Granted: 2022-09-13
- Earliest claimed: 2018-08-14
- Assignees: Korea University Research and Business Foundation, Sejong Campus
- Applicants: Korea University Research and Business Foundation, Sejong Campus
- Inventors: Jin Sung Park; Gyu Do Lee; Woong Kim; Hyun Jun Park
- Web page: https://patentgrep.com/patent/US11442050B2

## CPC

- G01N 31/22: using chemical indicators (G01N31/02 takes precedence)
- G01N 21/78: producing a change of colour
- G01N 33/025: {Fruits or vegetables}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- G01N 2021/8466: {Investigation of vegetal material, e.g. leaves, plants, fruits}
- 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)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## Abstract

Provided is an aluminum ion detector. The aluminum ion detector may include apple extracts having a predetermined concentration, and metal nano particles coupled to the apple extracts.

## Claims

### Claim 1

An aluminum ion detector comprising:
apple extracts having a predetermined concentration; and
metal nano particles coupled to the apple extracts,
wherein the predetermined concentration is 20 wt % to 30 wt %,
wherein the aluminum ion detector selectively reacts with aluminum ions at a limit concentration of 20 μM or more, and
wherein the value of a total amount (Bmax) peculiarly coupled to aluminum ions is 1.379 or more.

### Claim 2 (depends on 1)

The aluminum ion detector of claim 1, wherein the apple extracts comprise a phenol compound and an organic acid.

### Claim 3 (depends on 2)

The aluminum ion detector of claim 2, wherein the phenol compound comprises polyphenol, and the organic acid comprises citrate.

### Claim 4 (depends on 1)

The aluminum ion detector of claim 1, wherein color change characteristics are provided according to whether the metal nano particles and aluminum ions are selectively reacted.

### Claim 5 (depends on 4)

The aluminum ion detector of claim 4, wherein a predetermined concentration of the apple extracts is defined as in Equation 1, and the color change characteristics according to the selective reaction with the aluminum ions are controlled according to the predetermined concentration of the apple extracts,
Concentration=(volume of apple extracts)/(volume of apple extracts+volume of distilled water). <Equation 1>

### Claim 6 (depends on 1)

The aluminum ion detector of claim 1, wherein the aluminum ion detector is self-condensed.

### Claim 7 (depends on 1)

The aluminum ion detector of claim 1, wherein the metal is gold (Au).

### Claim 8 (depends on 1)

The aluminum ion detector of claim 1, wherein the value of a concentration (Kd) reaching 50% of a total amount peculiarly coupled to aluminum ions is 0.016 or less.

### Claim 9 (depends on 1)

A method for manufacturing the aluminum ion detector of claim 1, the method comprising:
acquiring apple extracts comprising a phenol compound and an organic acid from an apple; and
mixing the apple extracts of a predetermined concentration with metal nano particles and heat-treating the mixture, wherein the predetermined concentration is 20 wt % to 30 wt %.

### Claim 10 (depends on 9)

The method of claim 9, wherein the metal nano particles comprise gold nano particles.

### Claim 11 (depends on 1)

An aluminum ion detecting method using the aluminum ion detector of claim 1, comprising:
an aluminum ion reacting step of, in the aluminum ion detector comprising apple extracts comprising a phenol compound and an organic acid, and metal nano particles coupled to the apple extracts, causing aluminum ions to selectively react with the metal nano particles; and
an aluminum ion detecting step of measuring a color change of the aluminum ion detector by using a reaction of the metal nano particles and the aluminum ions.

### Claim 12 (depends on 11)

The aluminum ion detecting method of claim 11, wherein in the aluminum ion detecting step, a color change of an aluminum ion detecting probe is controlled according to a predetermined concentration of the apple extracts, and the predetermined concentration of the apple extracts is defined as in Equation 1,
Concentration=(volume of apple extracts)/(volume of apple extracts+volume of distilled water). <Equation 1>