Controlled-release fertilizer comprising oxidized glutathione

Patent metadata

Field	Value
Publication number	US-10596221-B2
Application number	US-201715671721-A
Country	US
Kind code	B2
Filing date	Aug 8, 2017
Priority date	Feb 9, 2015
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

A controlled-release fertilizer includes oxidized glutathione and a release control agent, and a method produces the controlled-release fertilizer.

First claim

What is claimed is:

1. A controlled-release fertilizer comprising:
0.000001% to 20% by mass of oxidized glutathione;
0.01% to 20% by mass of carboxymethyl cellulose or a salt thereof; and
60% to 99.98% by mass of an inorganic porous material.

2. The controlled-release fertilizer according to claim 1 , wherein a pH level is from 2.0 to less than 8.0 when the controlled-release fertilizer is dispersed in water.

3. The controlled-release fertilizer according to claim 1 , wherein the controlled-release fertilizer has a moisture content of 10% by mass or less.

4. The controlled-release fertilizer according to claim 1 , wherein the oxidized glutathione is selected from the group consisting of an ammonium salt, a calcium salt, and a magnesium salt of oxidized glutathione.

5. The controlled-release fertilizer according to claim 1 , wherein the oxidized glutathione is dispersed in a matrix comprising the carboxymethyl cellulose or a salt thereof.

6. The controlled-release fertilizer according to claim 1 , obtained by a method comprising:
preparing a mixture of the oxidized glutathione, the carboxymethyl cellulose or a salt thereof, and a medium, wherein the medium is water or a water-soluble medium; and
forming grains comprising the oxidized glutathione and the carboxymethyl cellulose or a salt thereof from the mixture.

7. The controlled-release fertilizer according to claim 1 , wherein a total mass of the oxidized glutathione eluted into distilled water at 30° C. is 0.60 T or less after 12 hours, 0.80 T or less after 24 hours, 0.90 T or less after 48 hours, and 0.95 T or less after 72 hours, when 1.25 g of the controlled-release fertilizer is added to 25 ml of the distilled water, provided that the initial total mass of the oxidized glutathione expressed in terms of the free form contained in the controlled-release fertilizer is designated as T.

8. A method for growing a plant, comprising applying a controlled-release fertilizer to the plant,
wherein the controlled-release fertilizer comprises:
0.000001% to 20% by mass of oxidized glutathione;
0.01% to 20% by mass of carboxymethyl cellulose or a salt thereof; and
60% to 99.98% by mass of an inorganic porous material.

9. The controlled-release fertilizer according to claim 1 , wherein the inorganic porous material is clay.

10. The controlled-release fertilizer according to claim 1 ,
wherein the controlled-release fertilizer comprises: 0.005% to 5% by mass of the oxidized glutathione; 0.1% to 10% by mass of the carboxymethyl cellulose or a salt thereof; and 80% to 99% by mass of the inorganic porous material.

11. The method according to claim 8 , wherein the inorganic porous material is clay.

Assignees

• Kaneka Corp

Inventors

• Uekita Ken
• Mouri Taku
• Watanabe Toyoaki
• Fu Yu
• Taoka Naoaki

Classifications

• A61K38/063 Primary

  Glutathione · CPC title

• A01N25/12

  Powders or granules (A01N25/26 takes precedence) · CPC title

• C05G5/40

  Fertilisers incorporated into a matrix · CPC title

• A01N41/12

  not containing sulfur-to-oxygen bonds, e.g. polysulfides · CPC title

• C07K5/123

  Tripeptides · CPC title