Toxic Effects of Organic Solvents on the Growth of Chlorella vulgaris and Selenastrum capricornutum

Jay, A. El

doi:10.1007/s001289900174

Cited by 59 publications

(37 citation statements)

References 14 publications

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“…In addition, algal assays are relatively simple, quick, and inexpensive in comparison with bioassays using other organisms (Latała et al 2005). Conventional response endpoints of laboratory toxicity tests undertaken with phytoplankton include final yield (biomass or cell densities) (Ma and Chen 2005;Lin et al 2005), growth rate (Chen and Lin 2006;Wells and Coombe 2006), chlorophyll contents (Jay 1996;Li et al 2005), phosphate uptake (Kaneko et al 2004) and photosynthetic activity (Pardos et al 1998). Most of the aforementioned endpoints result from chronic exposure of usually 3-4 d; whereas photosynthetic activity can be estimated in short duration, usually 2-4 h (Van der Heever and Grobbelaar 1996;Hall et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Microalgal photosynthetic activity measurement system for rapid toxicity assessment

et al. 2008

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A systematic biosensor is constructed for the estimation of toxic compounds based on photosynthetic activity measurement in Selenastrum capricornutum cells. The photosynthetic response was evaluated as a function of light intensity, cell concentration and initial dissolved oxygen. The inhibitory effect of some toxicants (1-butyl-3-methylimidazolium tetrafluoroborate, methanol) on dissolved oxygen production was also determined. In all cases, a toxic response was detected (i.e. a dose-related inhibition of photosynthetic activity was observed). For the present system, a time of only 2 h was needed to predict EC50 values as compared to 96 h for a conventional algal assay based on algal growth rate. Thus, the developed biosensor was proved to be useful as a rapid and simple test method in environmental toxicity assessment.

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Section: Introductionmentioning

confidence: 99%

Microalgal photosynthetic activity measurement system for rapid toxicity assessment

et al. 2008

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“…In addition, a control test, in which algae were cultured without herbicide, was employed. The final concentration of DMSO was less than 0.1% (v/v), a concentration at which no adverse effects have been observed [23].…”

Section: Algal Cell Viability Testmentioning

confidence: 99%

Effects of four rice paddy herbicides on algal cell viability and the relationship with population recovery

Nagai

Ishihara²,

Yokoyama

et al. 2011

Enviro Toxic and Chemistry

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Paddy herbicides are a high-risk concern for aquatic plants, including algae, because they easily flow out from paddy fields into rivers, with toxic effects. The effect on algal population dynamics, including population recovery after timed exposure, must be assessed. Therefore, we demonstrated concentration-response relationships of four paddy herbicides for algal growth inhibition and mortality, and the relationship between the effect on algal cell viability and population recovery following exposure. We used SYTOX Green dye assay and flow cytometry to assess cell viability of the alga Pseudokirchneriella subcapitata. Live cells could be clearly distinguished from dead cells during herbicide exposure. Our results showed that pretilachlor and quinoclamine had both algicidal and algistatic effects, whereas bensulfuron-methyl only had an algistatic effect, and pentoxazone only had an algicidal effect. Then, a population recovery test following a 72-h exposure was conducted. The algal population recovered in all tests, but the periods required for recovery differed among exposure concentrations and herbicides. The periods required for recovery were inconsistent with the dead cell ratio at the beginning of the recovery test; that is, population recovery could not be described only by cell viability. Consequently, the temporal effect of herbicides and subsequent recovery of the algal population could be described not only by the toxicity characteristics but also by toxicokinetics, such as rate of uptake, transport to the target site, and elimination of the substance from algal cells.

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“…All organophosphorous pesticides (Dr Ehrenstorfer, Germany) were dissolved in acetone (HPLC grade) making up a concentration of the carrier in medium less than 50 µl l -1 (Jay, 1996). The experimental design and test conditions were identical for the 7 selected toxicants tested (azinphos ethyl, azinphos methyl, dimethoate, disulfoton, fenthion, parathion ethyl and parathion methyl).…”

Section: Methodsmentioning

confidence: 99%

Toxicity of Organophoshorous pesticides to the marine alga Tetraselmis Suecica

2013

Global NEST Journal

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Organophoshorous pesticides are widely used in agriculture, because most of them are high effective and low persistent. Yet their increased usage has elicited extensive research into pesticide effects on non-target organisms, such as algae. Algae are of vital importance in the primary production of aquatic ecosystems. Furthermore they have been considered to be indicators of the bioactivity of industrial wastes and they vary in their response to a variety of toxicants. However little is known about the toxicity of the new pesticides to marine green algae. Laboratory toxicity data concerning responses of aquatic organisms to pesticides are important for focusing on sensitive species exposed to aqueous concentrations of these pesticides in field studies and they also allow prediction of expected responses of aquatic species to a range of pesticides concentrations in situ. The effects of seven organophosphorous pesticides on the green unicellular marine alga Tetraselmis suecica were studied through 96h toxicity tests. The pesticides tested were azinphos ethyl, azinphos methyl, dimethoate, fenthion, parathion ethyl, parathion methyl and disulfoton,. Maximum Specific Population Growth Rates (MSGRs) were calculated for each pesticide tested. Also NOEC, LOEC values and MATC at 96h were estimated when compared to the controls.

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Toxic Effects of Organic Solvents on the Growth of Chlorella vulgaris and Selenastrum capricornutum

Cited by 59 publications

References 14 publications

Microalgal photosynthetic activity measurement system for rapid toxicity assessment

Microalgal photosynthetic activity measurement system for rapid toxicity assessment

Effects of four rice paddy herbicides on algal cell viability and the relationship with population recovery

Toxicity of Organophoshorous pesticides to the marine alga Tetraselmis Suecica

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