US 6,949,250 B2Granted

Selective algaecides for control of cyanochloronta

AssigneesThe United States of America as represented by the Secretary of Agriculture, The University of Mississippi

InventorsKevin K. Schrader, N. P. Dhammika Nanayakkara

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Abstract

We have now discovered that certain 9,10-anthraquinone derivatives we developed possess potent activity against O. perornata while possessing a sufficiently high level of solubility in water to make their activity against O. perornata viable. These compounds possess a high level of activity against O. perornata yet are relatively non-toxic to green algae and fishes. The compounds also possess a relatively short half-life. The compounds represent a new means to providing compounds possessing a high degree of selective activity against blue-green algae while being physiologically tolerated by catfish and green algae. The compounds provide a means for controlling blue-green algae in managed bodies of water that are destined for public use or consumption.

Claims12

Dependent claims

A compound selected from the group consisting of:

wherein R1 is hydrogen or methyl;
R2, R3 and R4 are independently selected from hydrogen, methyl and ethyl;
n is 1-6;
and wherein the compound is a free amine or environmentally acceptable acid amine salt;
wherein R1 is hydrogen or methyl, R2, and R3 are independently selected from hydrogen, methyl, ethyl, straight-chain alkyl group having 3 to 8 carbon atoms and cyclic alkyl group having 3 to 6 carbon atoms, and wherein the compound is a free amine or environmentally acceptable acid amine salt, with the proviso that not both R2 and R3 are hydrogen;
and
wherein R1 and R2 are independently selected from methyl, ethyl, straight-chain alkyl group having 3 to 8 carbon atoms and cyclic alkyl group having 3 to 6 carbon atoms, and wherein the compound is a free amine or environmentally acceptable acid amine salt.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/320,651Filed 16 Dec 2002
Published: US 2004/0116536 A117 Jun 2004
Granted: 27 Sep 2005
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

C09B 1/00
Dyes with anthracene nucleus not condensed with any other ring
C09B 1/14
Preparation from starting materials already containing the anthracene nucleus: dyes containing ether groups
C09B 1/285
Substituted by alkyl, aralkyl or cyclo alkyl groups: dyes with no other substituents than the amino groups
C09B
Organic dyes or closely-related compounds for producing dyes