Effects of antifouling compounds on the growth of macroalgae Undaria pinnatifida

Nomura, M. A.; Okamura, Hideo; Horie, Y.; Yap, Chee Kong; Emmanouil, Christina; Uwai, Shinya; Kawai, Hiroshi

doi:10.1016/j.chemosphere.2022.137141

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…In this study, we introduce a new system that operates automatically and utilizes ultrasensitive detectors to measure the fluorescence of photosynthetic samples exposed to AF coatings. Although the fluorescence technique is widely recognized as one of the most suitable and accurate methods for assessing the photosynthetic activity of the sample 26,[59][60][61] , and the effect of antifouling paints on chlorophyll fluorescence kinetics is well known 38,62,63 , our work is pushing the boundaries of sensitivity, enabling continuous evaluation of the influence of AF paints on aquatic organisms. We proposed a novel system that can automatically measure chlorophyll a fluorescence and, through the implementation of a submersible Q -A reoxidation module, also monitor the dynamic changes occurring in the photosynthetic apparatus of microalgae.…”

Section: Discussionmentioning

confidence: 99%

Novel technique for the ultra-sensitive detection of hazardous contaminants using an innovative sensor integrated with a bioreactor

Orzechowska,

Czaderna-Lekka,

Trtílek

et al. 2024

Sci Rep

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This study introduces an evaluation methodology tailored for bioreactors, with the aim of assessing the stress experienced by algae due to harmful contaminants released from antifouling (AF) paints. We present an online monitoring system equipped with an ultra-sensitive sensor that conducts non-invasive measurements of algal culture's optical density and physiological stage through chlorophyll fluorescence signals. By coupling the ultra-sensitive sensor with flash-induced chlorophyll fluorescence, we examined the dynamic fluorescence changes in the green microalga Chlamydomonas reinhardtii when exposed to biocides. Over a 24-h observation period, increasing concentrations of biocides led to a decrease in photosynthetic activity. Notably, a substantial reduction in the maximum quantum yield of primary photochemistry (FV/FM) was observed within the first hour of exposure. Subsequently, we detected a partial recovery in FV/FM; however, this recovery remained 50% lower than that of the controls. Integrating the advanced submersible sensor with fluorescence decay kinetics offered a comprehensive perspective on the dynamic alterations in algal cells under the exposure to biocides released from antifouling coatings. The analysis of fluorescence relaxation kinetics revealed a significant shortening of the fast and middle phases, along with an increase in the duration of the slow phase, for the coating with the highest levels of biocides. Combining automated culturing and measuring methods, this approach has demonstrated its effectiveness as an ultrasensitive and non-invasive tool for monitoring the physiology of photosynthetic cultures. This is particularly valuable in the context of studying microalgae and their early responses to various environmental conditions, as well as the potential to develop an AF system with minimal harm to the environment.

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Section: Discussionmentioning

confidence: 99%

Novel technique for the ultra-sensitive detection of hazardous contaminants using an innovative sensor integrated with a bioreactor

Orzechowska,

Czaderna-Lekka,

Trtílek

et al. 2024

Sci Rep

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“…A new generation of organic or organometallic biocides (e.g., dicopper oxide; copper or zinc pyrithione (ZnPT/CuPT); diuron; chlorothalonil; cybutryne or Irgarol ® 1051; DCOIT (4,5-Dichloro-2-octylisothiazol-3(2H)-one)) emerged as an environmentally safer alternative than the former generation, promising a broad-spectrum activity and lower ecotoxicity, solubility in seawater, bioaccumulation and persistence in the environment comparing with TBT-related biocides [13]. Nevertheless, several studies have shown that most current AF biocides are toxic, very, or extremely toxic towards non-target marine species, causing a wide variety of acute and/or chronic effects in non-target organisms [14][15][16][17][18][19][20], and posing critical environmental risk to demersal and benthic species worldwide [13,[21][22][23]. Consequently, a number of countries have increasingly adopted stricter regulations on the use of such chemicals, in particular, cybutryne, which was already banned to be used as active ingredient in AF paints in the EU (since 2017 [24]), USA (after 2023 [25]), and other countries, due to its toxicity, including coral bleaching, and persistence in the environment [26].…”

Section: Introductionmentioning

confidence: 99%

Marine Hazard Assessment of Soluble and Nanostructured Forms of the Booster Biocide DCOIT in Tropical Waters

Perina

Ottoni

Santos

et al. 2023

Water

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The encapsulation of antifouling compounds, such as DCOIT (4,5-Dichloro-2-octylisothiazol-3(2H)-one), in mesoporous silica nanocapsules (SiNC) has recently been demonstrated to be an eco-friendly alternative to decrease biocide toxicity towards marine non-target species. However, the lack of information on the chronic effects of such nanomaterials on non-target tropical species is critical for a more comprehensive environmental risk assessment. Thus, the present study aimed to assess the chronic toxicity and hazard of the soluble and encapsulated forms of DCOIT on neotropical marine species. Chronic tests were conducted with six ecologically relevant species. No effect concentration (NOEC) values were combined with NOEC values reported for tropical species to assess the hazard using the probabilistic approach to derive each predicted no effect concentration (PNEC). The SiNC-DCOIT was three- to ten-fold less toxic than soluble DCOIT. Probabilistic-based PNECs were set at 0.0001 and 0.0097 µg DCOIT L−1 for the biocide soluble and nanostructured forms, respectively. The immobilization of DCOIT into SiNC led to an 84-fold hazard decrease, confirming that the encapsulation of DCOIT into SiNC is a promising eco-friendly alternative technique, even in a chronic exposure scenario. Therefore, the present study will contribute to better management of the environmental risk of such innovative products in the tropical marine environment.

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Pesticide contamination and associated ecological risks in estuarine waters of Brazil’s Legal Amazon

Viana,

dos Santos,

Santos

et al. 2024

Environ Sci Pollut Res

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Effects of antifouling compounds on the growth of macroalgae Undaria pinnatifida

Cited by 4 publications

References 36 publications

Novel technique for the ultra-sensitive detection of hazardous contaminants using an innovative sensor integrated with a bioreactor

Novel technique for the ultra-sensitive detection of hazardous contaminants using an innovative sensor integrated with a bioreactor

Marine Hazard Assessment of Soluble and Nanostructured Forms of the Booster Biocide DCOIT in Tropical Waters

Pesticide contamination and associated ecological risks in estuarine waters of Brazil’s Legal Amazon

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