Inactivating pathogenic microorganisms using cold plasma

Patent metadata

Field	Value
Publication number	US-10729798-B2
Application number	US-201716302436-A
Country	US
Kind code	B2
Filing date	May 15, 2017
Priority date	May 19, 2016
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

This present invention generally relates to a process for manipulating the chemistry of a product using high voltage atmospheric cold plasma (HVACP) in the presence of a working gas, and in particular to a process for inactivating pathogenic microorganisms in a liquid product by adding an acidic component to or adjusting an acidic component of a product in combination with HVACP treatment. A product of this process is also in the scope of this disclosure.

First claim

What is claimed is:

1. A process for manipulating a liquid product using high voltage atmospheric cold plasma (HVACP), comprising the steps of:
a. adding an acidic component to or adjusting an acidic component of a product to a final concentration from about 10 ppm to about 50,000 ppm;
b. setting up a defined compartment filled with a working gas and an electric system for generating atmospheric cold plasma (ACP);
c. generating ACP by applying a high electric voltage through a controller; and
d. exposing said product to said ACP in said defined compartment.

2. The process of claim 1 , wherein said ACP is generated by applying an electric voltage from about 30,000 volts to about 120,000 volts, between two dielectric barriers for a period of time.

3. The process of claim 1 , wherein said manipulating is to inactivate or kill pathogenic and non-pathogenic microorganisms in said liquid product for consumption by human or animal.

4. The process of claim 1 , wherein said working gas is a single or a mixture of combined gases comprising air, hydrogen, nitrogen, oxygen, carbon dioxide, and noble gases.

5. The process of claim 4 , wherein said working gas is air.

6. The process of claim 4 , wherein said working gas is a modified air comprising about 65% oxygen, about 30% carbon dioxide, and about 5% nitrogen.

7. The process of claim 1 , wherein said acid component is selected from the group consisting of acetic acid, ascorbic acid, benzoic acid, carbonic acid, citric acid, glutamic acid, glycolic acid, hydrochloric acid, lactic acid, malic acid, oxalic acid, propionic acid, tartaric acid, natural amino acids, or a combination of two or more of said acids.

8. The process of claim 7 , wherein said acid component is citric acid or ascorbic acid.

9. The process of claim 1 , wherein said product is a food or drink product for consumption by human or animal.

10. The process of claim 1 , wherein said liquid product is a liquid product for cleaning, washing, or dressing for food, feed, medical, pharmaceutical, or household uses, or a liquid product for consumption by human or animal.

11. The process of claim 1 , wherein said liquid product is a liquid product selected from the group of water, carbonated water, coconut water, tender coconut water, fruit juices, vegetable juices, mixed fruit juices, mixed vegetable juices, mixed fruit and vegetable juices, sports drinks, saline water, rehydration liquid formulations, milk, liquid milk products, alcoholic beverages, and fermented beverages.

12. The process of claim 1 , wherein said liquid product is water or coconut water.

13. A liquid product prepared using high voltage atmospheric cold plasma (HVACP), according the process of:
a. adding an acidic component to or adjusting an acidic component of a product to a final concentration from about 10 ppm to about 50,000 ppm;
b. setting up a defined compartment filled with a working gas and an electric system for generating atmospheric cold plasma (ACP);
c. generating ACP by applying a high electric voltage through a controller; and
d. exposing said product to said ACP in said defined compartment.

14. The product of claim 13 , wherein said liquid product is a liquid product for cleaning, washing, or dressing for food, feed, medical, pharmaceutical, or household uses, or a liquid product for consumption by human or animal.

15. The product of claim 14 , wherein said liquid product is a liquid food product comprising water, carbonated water, coconut water, tender coconut water, fruit juices, vegetable juices, mixed fruit juices, mixed vegetable juices, mixed fruit and vegetable juices, sports drinks, saline water, rehydration liquid formulations, milk, liquid milk products, alcoholic beverages, including beer, wines, ciders, or the like.

16. The product of claim 15 , wherein said liquid product is water or coconut water.

17. The product of claim 13 , wherein said acidic component comprises acetic acid, ascorbic acid, benzoic acid, carbonic acid, citric acid, glutamic acid, glycolic acid, hydrochloric acid, lactic acid, malic acid, oxalic acid, propionic acid, tartaric acid, natural amino acids, or a combination of two or more of said acids.

18. The product of claim 13 , wherein said working gas is a single or combined gases including, but not limited to, air, hydrogen, nitrogen, oxygen, carbon dioxide, noble gases, or a combination thereof.

19. The product of claim 13 , wherein said working gas is air.

20. The product of claim 13 , wherein said working gas is a modified air comprising about 65% oxygen, about 30% carbon dioxide, and about 5% nitrogen.

21. The product of claim 13 , wherein said ACP is generated by applying an electric voltage from about 30,000 volts to about 120,000 volts, between two dielectric barriers for a period of time.

Assignees

• Purdue Research Foundation

Inventors

• Keener Kevin Michael
• Mahnot Nikhil K

Classifications

• A61L2/02

  using physical processes · CPC title

• A61L2103/05

  Living organisms or biological materials · CPC title

• H05H1/2406

  using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes · CPC title

• A23B70/50

  by irradiation or electric treatment, without heating · CPC title

• A23B2/50

  by irradiation without heating · CPC title