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Usnic acid potassium salt: an alternative for the control of Biomphalaria glabrata (Say, 1818).

In Brazil, the snail Biomphalaria glabrata is the most important vector of schistosomiasis due to its wide geographical distribution, high infection rate and efficient disease transmission. Among the methods of schistosomiasis control, the World Health Organization recommends the use of synthetic mo... Full description

Journal Title: PloS one 2014, Vol.9(11), p.e111102
Main Author: Martins, Mônica C B
Other Authors: Silva, Monique C , Silva, Luanna R S , Lima, Vera L M , Pereira, Eugênia C , Falcão, Emerson P S , Melo, Ana M M A , Da Silva, Nicácio Henrique
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1932-6203 ; DOI: 1932-6203 ; DOI: 10.1371/journal.pone.0111102
Link: http://search.proquest.com/docview/1622057732/?pq-origsite=primo
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title: Usnic acid potassium salt: an alternative for the control of Biomphalaria glabrata (Say, 1818).
format: Article
creator:
  • Martins, Mônica C B
  • Silva, Monique C
  • Silva, Luanna R S
  • Lima, Vera L M
  • Pereira, Eugênia C
  • Falcão, Emerson P S
  • Melo, Ana M M A
  • Da Silva, Nicácio Henrique
subjects:
  • Animals–Toxicity
  • Benzofurans–Drug Effects
  • Biomphalaria–Parasitology
  • Molluscacides–Toxicity
  • Schistosoma Mansoni–Prevention & Control
  • Schistosomiasis–Prevention & Control
  • Benzofurans
  • Molluscacides
  • Usnic Acid
ispartof: PloS one, 2014, Vol.9(11), p.e111102
description: In Brazil, the snail Biomphalaria glabrata is the most important vector of schistosomiasis due to its wide geographical distribution, high infection rate and efficient disease transmission. Among the methods of schistosomiasis control, the World Health Organization recommends the use of synthetic molluscicides, such as niclosamide. However, different substances of natural origin have been tested as alternatives for the control or eradication of mollusks. The literature describes the antitumor, antimicrobial and antiviral properties of usnic acid as well as other important activities of common interest between medicine and the environment. However, usnic acid has a low degree of water solubility, which can be a limiting factor for its use, especially in aquatic environments, since the organic solvents commonly used to solubilize this substance can have toxic effects on aquatic biota. Thus, the aim of the present study was to test the potassium salt of usnic acid (potassium usnate) with regard to molluscicidal activity and toxicity to brine shrimp (Artemia salina). To obtain potassium usnate, usnic acid was extracted with diethyl ether isolated and purified from the lichen Cladonia substellata. Biological assays were performed with embryos and adult snails of B. glabrata exposed for 24 h to the usnate solution solubilized in dechlorinated water at 2.5; 5 and 10 [micro]g/ml for embryos, 0.5; 0.9; 1;5 and 10 [micro]g/ml for mollusks and 0.5; 1; 5; 10 [micro]g/ml for A. salina. The lowest lethal concentration for the embryos and adult snails was 10 and 1 [micro]g/ml, respectively. No toxicity to A. salina was found. The results show that modified usnic acid has increased solubility (100%) without losing its biological activity and may be a viable alternative for the control of B. glabrata.
language: eng
source:
identifier: E-ISSN: 1932-6203 ; DOI: 1932-6203 ; DOI: 10.1371/journal.pone.0111102
fulltext: fulltext
issn:
  • 19326203
  • 1932-6203
url: Link


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titleUsnic acid potassium salt: an alternative for the control of Biomphalaria glabrata (Say, 1818).
creatorMartins, Mônica C B ; Silva, Monique C ; Silva, Luanna R S ; Lima, Vera L M ; Pereira, Eugênia C ; Falcão, Emerson P S ; Melo, Ana M M A ; Da Silva, Nicácio Henrique
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subjectAnimals–Toxicity ; Benzofurans–Drug Effects ; Biomphalaria–Parasitology ; Molluscacides–Toxicity ; Schistosoma Mansoni–Prevention & Control ; Schistosomiasis–Prevention & Control ; Benzofurans ; Molluscacides ; Usnic Acid
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descriptionIn Brazil, the snail Biomphalaria glabrata is the most important vector of schistosomiasis due to its wide geographical distribution, high infection rate and efficient disease transmission. Among the methods of schistosomiasis control, the World Health Organization recommends the use of synthetic molluscicides, such as niclosamide. However, different substances of natural origin have been tested as alternatives for the control or eradication of mollusks. The literature describes the antitumor, antimicrobial and antiviral properties of usnic acid as well as other important activities of common interest between medicine and the environment. However, usnic acid has a low degree of water solubility, which can be a limiting factor for its use, especially in aquatic environments, since the organic solvents commonly used to solubilize this substance can have toxic effects on aquatic biota. Thus, the aim of the present study was to test the potassium salt of usnic acid (potassium usnate) with regard to molluscicidal activity and toxicity to brine shrimp (Artemia salina). To obtain potassium usnate, usnic acid was extracted with diethyl ether isolated and purified from the lichen Cladonia substellata. Biological assays were performed with embryos and adult snails of B. glabrata exposed for 24 h to the usnate solution solubilized in dechlorinated water at 2.5; 5 and 10 [micro]g/ml for embryos, 0.5; 0.9; 1;5 and 10 [micro]g/ml for mollusks and 0.5; 1; 5; 10 [micro]g/ml for A. salina. The lowest lethal concentration for the embryos and adult snails was 10 and 1 [micro]g/ml, respectively. No toxicity to A. salina was found. The results show that modified usnic acid has increased solubility (100%) without losing its biological activity and may be a viable alternative for the control of B. glabrata.
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titleUsnic acid potassium salt: an alternative for the control of Biomphalaria glabrata (Say, 1818).
authorMartins, Mônica C B ; Silva, Monique C ; Silva, Luanna R S ; Lima, Vera L M ; Pereira, Eugênia C ; Falcão, Emerson P S ; Melo, Ana M M A ; Da Silva, Nicácio Henrique
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