Metals and linear alkylbenzene sulphonate as inhibitors of the algae Pseudokirchneriella subcapitata acid phosphatase activity

Sewage sludge applied to soils as a fertilizer often contains metals and linear alkylbenzene sulphonate (LAS) as contaminants. These pollutants can be transported to the aquatic environment where they can alter the phosphatase activity in living organisms. The acid phosphatase of algae plays importa...

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Bibliographic Details
Published in:Ecotoxicology (London) 2009-07, Vol.18 (5), p.610-619
Main Authors: Jonsson, Claudio Martín, Paraiba, Lourival Costa, Aoyama, Hiroshi
Format: Article
Language:English
Subjects:
Acid Phosphatase - antagonists & inhibitors
Acid Phosphatase - isolation & purification
Algae
Algal Proteins - antagonists & inhibitors
Algal Proteins - isolation & purification
Alkanesulfonic Acids - chemistry
Alkanesulfonic Acids - pharmacology
Alkylbenzene sulfonate
Aquatic environment
Contaminants
Earth and Environmental Science
Ecology
Ecotoxicology
Environment
Environmental Management
Eukaryota - drug effects
Eukaryota - enzymology
Inhibitory Concentration 50
Metals, Heavy - chemistry
Metals, Heavy - pharmacology
Pollutants
Pseudokirchneriella subcapitata
Sewage sludge
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - pharmacology
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Summary:Sewage sludge applied to soils as a fertilizer often contains metals and linear alkylbenzene sulphonate (LAS) as contaminants. These pollutants can be transported to the aquatic environment where they can alter the phosphatase activity in living organisms. The acid phosphatase of algae plays important roles in metabolism such as decomposing organic phosphate into free phosphate and autophagic digestive processes. The order of in vitro inhibition of Pseudokirchneriella subcapitata acid phosphatase at the highest concentration tested was LAS > Hg²⁺ = Al³⁺ > Se⁴⁺ = Pb²⁺ > Cd²⁺. A non-competitive inhibition mechanism was obtained for Hg²⁺ (K i = 0.040 mM) and a competitive inhibition for LAS (K i = 0.007 mM). In vivo studies with treated algae cultures showed that the inhibition of specific activity was observed in algae exposed during 7 days, in contrast to short term (24 h) treatments with both these chemicals. Our results suggest that the inhibition parameters in vitro did not markedly differ between the two chemicals. On the other hand, in vivo evaluations showed strong differences between both pollutants regarding the concentration values and the degree of response.
ISSN:0963-9292
1573-3017
DOI:10.1007/s10646-009-0319-0