Matrices for detecting volatile organic compounds

Patent metadata

Field	Value
Publication number	US-11536666-B2
Application number	US-202017095127-A
Country	US
Kind code	B2
Filing date	Nov 11, 2020
Priority date	Nov 11, 2019
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A device for detecting volatile compounds. The device includes a substrate and a matrix disposed on the substrate. The matrix includes a carboxyl-rich binder, a clay, and a pH-sensitive indicator dye admixed with the binder and the clay. The pH-sensitive indicator dye is dimensioned and configured to change color in response to contact with a pre-determined concentration of a volatile compound.

First claim

What is claimed is:

1. A device for detecting volatile compounds, the device comprising:
a substrate;
a matrix disposed on the substrate, the matrix comprising
a binder comprising carboxyl-containing biomass
a clay; and
a pH-sensitive indicator dye admixed with the binder and the clay;

wherein the pH-sensitive indicator dye is used in a concentration that allows the pH-sensitive indicator dye to change color in response to contact with a concentration of a volatile compound.

2. The device of claim 1 , wherein the clay comprises a smectite clay.

3. The device of claim 1 , wherein the clay comprises an illite clay.

4. The device of claim 1 , wherein the clay comprises a phyllosilicate.

5. The device of claim 1 , wherein the clay comprises bentonite.

6. The device of claim 1 , wherein the binder comprises cellulosic biomass.

7. The device of claim 6 , wherein the binder comprises a material selected from the group consisting of soybean hulls, acid-treated soybean hulls, and nanofibrillated soybean hulls.

8. The device of claim 1 , wherein the pH-sensitive indicator dye is used in a concentration that allows the device to detect volatile bases.

9. A device for detecting volatile basic compounds, the device comprising:
a substrate;
a matrix disposed on the substrate, the matrix comprising
a binder comprising acid-treated soybean hulls;
a smectite clay; and
a pH-sensitive indicator dye admixed with the binder and the smectite clay;

wherein the pH-sensitive indicator dye is used in a concentration that allows the pH-sensitive indicator dye to change color in response to contact with a pre-determined concentration of a volatile basic compound.

10. The device of claim 9 , wherein the clay comprises bentonite.

11. The device of claim 9 , wherein the clay comprises bentonite and the binder comprises nanofibrillated soybean hulls.

12. The device of claim 9 , wherein the substrate is a material selected from the group consisting of paper, thermoplastic films, thermosetting films, and cellulosic films.

13. The device of claim 9 , wherein the pH-sensitive indicator dye is selected from the group consisting of Bromocresol Purple, dichlorofluorescein, Methyl Red, Bromocresol Green, and Chlorophenol Red.

14. A method for showing freshness and testing spoilage of food, the method comprising
(a) providing a device comprising:
a substrate;
a matrix disposed on the substrate, the matrix comprising
a binder comprising carboxyl-containing biomass;
a clay; and
a pH-sensitive indicator dye admixed with the binder and the clay;

wherein the pH-sensitive indicator dye is used in a concentration that allows the pH-sensitive indicator dye to change color in response to a concentration of total volatile base nitrogen compounds generated by spoilage microorganisms growing within a food product; and
wherein the change in color of the pH-sensitive indicator dye occurs at or below a threshold concentration of spoilage microorganisms within the food product at which the food product is deemed unsafe to consume by humans; and
(b) placing the device of step (a) in a package of food.

15. The method of claim 14 , wherein the clay comprises a smectite clay.

16. The method of claim 14 , wherein the clay comprises an illite clay.

17. The method of claim 14 , wherein the clay comprises a phyllosilicate.

18. The method of claim 14 , wherein the clay comprises bentonite.

19. The method of claim 14 , wherein the binder comprises a material selected from the group consisting of soybean hulls, acid-treated soybean hulls, and nanofibrillated soybean hulls.

Assignees

• Univ Auburn

Inventors

• Aksoy Burak
• Jiang Zhihua
• Aksoy Mediha
• Beck Benjamin
• Alamdari Navid E

Classifications

• G01N33/12

  Meat; Fish · CPC title

• C12Q1/04 Primary

  Determining presence or kind of microorganism; Use of selective media for testing antibiotics or bacteriocides; Compositions containing a chemical indicator therefor {(C12Q1/6897 takes precedence)} · CPC title

• G01N21/80 Primary

  Indicating pH value · CPC title

• G01N31/221

  for investigating pH value · CPC title

• G01N21/783

  for analysing gases · CPC title