Method for inactivating biologically active components in a liquid

Patent metadata

Field	Value
Publication number	US-12350387-B2
Application number	US-201917282516-A
Country	US
Kind code	B2
Filing date	Sep 25, 2019
Priority date	Oct 5, 2018
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A method may be provided for inactivating biologically active components in a liquid using low-energy electrons generated by an electron source, the electrons having an acceleration voltage of 25 keV to 300 keV. The method comprises the following steps: a) filling a vessel with a liquid volume; b) applying low-energy electrons to a first partial volume of the liquid filled into the vessel, wherein the first partial volume is a maximum of 10% of the liquid volume in the vessel; c) mixing the first partial volume of the liquid, applied with the low-energy electrons, to the second partial liquid volume in the vessel, which has not been applied with low-energy electrons; d) repeating steps b) and c) several times.

First claim

The invention claimed is:

1. A method for inactivating biologically active components in a liquid, the method comprising:
pouring a liquid into a vessel forming a liquid volume;
irradiating a first partial volume of the liquid volume with a plurality of low-energy electrons, wherein the low-energy electrons are generated by an electron source and have an acceleration voltage of 25 keV to 300 keV, further wherein the first partial volume comprises a maximum of 10% of the liquid volume in the vessel;
mixing the first partial volume of the liquid irradiated with the low-energy electrons with a second partial volume of the liquid in the vessel that was not irradiated with the low-energy electrons; and
repeating the irradiating of the first partial volume and the mixing of the first partial volume with the second partial volume a plurality of times for inactivating the biologically active components in the liquid;
wherein a sub-area of a wall of the vessel is designed as an electron exit window of the electron source, through which low-energy electrons penetrate into the first partial volume of the liquid in the vessel and where the electron exit window has a direct contact with the first partial volume of the liquid, wherein means for mixing the liquid in the vessel cause the composition of the first partial volume of the liquid in the vessel to change.

2. The method of claim 1 , wherein the first partial volume of the liquid is irradiated with a maximum of 1% of the total of low-energy electrons required to inactivate all biologically active components in the first partial volume of the liquid.

3. The method of claim 1 , wherein the electron source is operated continuously during the entire process of inactivating all biological active components in the liquid.

4. The method of claim 1 , wherein the electron source is activated periodically.

5. The method of claim 1 , wherein the liquid in the vessel is mixed continuously during the entire process of inactivating all biologically active components in the liquid volume in the vessel.

6. The method of claim 1 , wherein the liquid in the vessel is mixed periodically.

7. The method of claim 1 , wherein the liquid in the vessel is mixed continuously.

8. The method of claim 1 , wherein the first partial volume comprises a maximum of 5% of the liquid volume in the vessel.

9. The method of claim 1 , wherein the first partial volume is irradiated with at least 90% of the energy of the low-energy electrons generated by the electron source.

10. The method of claim 1 , further comprising repeating the irradiating of the first partial volume and the mixing of the first partial volume with the second partial volume until biologically active components of a liquid in the vessel are inactivated.

11. The method of claim 1 , wherein the vessel is a bioreactor.

Assignees

• Fraunhofer Ges Forschung

Inventors

• Kirchhoff Volker
• Weidauer André
• Schönfelder Jessy
• Gotzmann Gaby
• Wetzel Christiane
• Kubusch Jörg

Classifications

• A61L2202/14

  Means for controlling sterilisation processes, data processing, presentation and storage means, e.g. sensors, controllers, programs · CPC title

• A61L2202/122

  Chambers for sterilisation · CPC title

• A61L2202/11

  Apparatus for generating biocidal substances, e.g. vaporisers, UV lamps · CPC title

• A61L11/00 Primary

  Methods specially adapted for refuse {(disintegrating medical waste B02C19/0075; disposal of medical waste B09B3/00)} · CPC title

• A61L2/26

  Accessories · CPC title