Can Encapsulation of the Biocide DCOIT Affect the Anti-Fouling Efficacy and Toxicity on Tropical Bivalves?

Santos, Juliana Vitoria Nicolau dos; Freitas, Rosa; Fontes, Mayana Karoline; Campos, Bruno Galvão de; Silva, Mariana Bruni Marques do Prado e; Maia, Frederico; Abessa, Denis Moledo de Souza; Perina, Fernando César

doi:10.3390/app10238579

Cited by 19 publications

(20 citation statements)

References 35 publications

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“…To date, very few studies have assessed the effects of encapsulated DCOIT in tropical marine species 65 . Even less is known about the effects of encapsulated DCOIT integrated in a coating, as compared to its free form, on marine species 64 .…”

Section: Discussionmentioning

confidence: 99%

“…Although the toxicity mechanism of DCOIT is not fully understood, embryotoxicity, immunosuppression, oxidative stress, reproductive and endocrine disruption in marine organisms have been reported 63 . However, some studies have shown effective AF properties of DCOIT encapsulated in silica nanocapsules which can decrease the toxicity towards non-target organisms 64 , 65 . Yet, no study to date has investigated the effects of DCOIT on hard corals, or encapsulated in a sol–gel.…”

Section: Introductionmentioning

confidence: 99%

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Antifouling coatings can reduce algal growth while preserving coral settlement

Roepke

Brefeld

Soltmann

et al. 2022

Sci Rep

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In the early stages after larval settlement, coral spat can be rapidly overgrown and outcompeted by algae, reducing overall survival for coral reef replenishment and supply for restoration programs. Here we investigated three antifouling (AF) coatings for their ability to inhibit algal fouling on coral settlement plugs, a commonly-used restoration substrate. Plugs were either fully or partially coated with the AF coatings and incubated in mesocosm systems with partial recirculation for 37 days to track fouling succession. In addition, settlement of Acropora tenuis larvae was measured to determine whether AF coatings were a settlement deterrent. Uncoated control plugs became heavily fouled, yielding only 4–8% bare substrate on upper surfaces after 37 days. During this period, an encapsulated dichlorooctylisothiazolinone (DCOIT)-coating was most effective in reducing fouling, yielding 61–63% bare substrate. Antiadhesive and cerium dioxide (CeO2−x) nanoparticle (NP) coatings were less effective, yielding 11–17% and 2% bare substrate, respectively. Average settlement of A. tenuis larvae on the three types of AF-coated plugs did not statistically differ from settlement on uncoated controls. However, settlement on the NP-coating was generally the highest and was significantly higher than settlement found on the antiadhesive- and DCOIT-coating. Furthermore, on plugs only partially-covered with AF coatings, larval settlement on coated NP- areas was significantly higher than settlement on coated antiadhesive- and DCOIT-areas. These results demonstrate that AF coatings can reduce fouling intensity on biologically-relevant timescales while preserving robust levels of coral settlement. This represents an important step towards reducing fine-scale competition with benthic fouling organisms in coral breeding and propagation.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Antifouling coatings can reduce algal growth while preserving coral settlement

Roepke

Brefeld

Soltmann

et al. 2022

Sci Rep

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“…Several materials with good biocidal and antifouling activity have been reported [14,15,[124][125][126][127][128][129][130]. Among these, the following stand out: halloysite clay nanotubes, mesoporous silica nanocapsules, and layered double hydroxides.…”

Section: Nanomaterials With Potential Use To Inhibit Biofouling On St...mentioning

confidence: 99%

“…Gutner-Hoch et al [15] observed a mild toxic effect on the nauplii of the crustacean Artemia salina and the sea urchin Paracentrotus lividus. This can be attributed to the presence, within its porous structure, of a quaternary ammonium compound (CTAB Hexadecyltrimethylammonium bromide), which is used as an emulsion stabilizer during the synthesis of nanocapsules [130,133]. This compound was catalogued as a toxic compound for a wide range of aquatic organisms [134].…”

Section: Mesoporous Silica Nanocapsulesmentioning

confidence: 99%

“…The release of zinc and copper pyrithione is limited by the low solubility of biocides in seawater [135,136]. When applying a DCOIT biocide load, Santos et al [130] observed that in gametes of the bivalve P. perna, the application of nanocapsules loaded with DCOIT was 137 times less toxic than free DCOIT. This substantial difference is related to the controlled release of the biocide that occurs gradually over time, and by predefined stimuli.…”

Section: Mesoporous Silica Nanocapsulesmentioning

confidence: 99%

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Use of Nanotechnology to Mitigate Biofouling in Stainless Steel Devices Used in Food Processing, Healthcare, and Marine Environments

Pérez

Vargas‐Gutiérrez

Silva

2022

Toxics

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In humid environments, the formation of biofilms and microfouling are known to be the detrimental processes that first occur on stainless steel surfaces. This is known as biofouling. Subsequently, the conditions created by metabolites and the activity of organisms trigger corrosion of the metal and accelerate corrosion locally, causing a deterioration in, and alterations to, the performance of devices made of stainless steel. The microorganisms which thus affect stainless steel are mainly algae and bacteria. Within the macroorganisms that then damage the steel, mollusks and crustaceans are the most commonly observed. The aim of this review was to identify the mechanisms involved in biofouling on stainless steel and to evaluate the research done on preventing or mitigating this problem using nanotechnology in humid environments in three areas of human activity: food manufacturing, the implantation of medical devices, and infrastructure in marine settings. Of these protective processes that modify the steel surfaces, three approaches were examined: the use of inorganic nanoparticles; the use of polymeric coatings; and, finally, the generation of nanotextures.

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Toxicological signature for thyroid endocrine disruption of dichlorooctylisothiazolinone in zebrafish larvae

2022

Ecotoxicology

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Dichlorooctylisothiazolinone (DCOIT), which is one of the isothiazolinone preservatives, is applied to water-based adhesives in food packaging. This study investigated the effects of DCOIT on the embryonic growth and thyroid endocrine system using zebra sh. Organism-level (hatchability, survival, and growth), hormone-level (triiodothyronine (T3) and thyroxine (T4)), gene-level (genes associated with the hypothalamus-pituitary-thyroid axis), and microRNA-level (microRNAs related to thyroid endocrine disruption) endpoints were measured. Signi cant rise in embryonic coagulation, delayed hatching, and decreased larval length were observed in sh exposed to greater than 0.3 μg/L DCOIT. Lower contents of T3 and T4 were observed after exposure to DCOIT, which was accompanied by the upregulation of genes associated with the thyrotropin releasing hormone and thyroid stimulating hormone and the downregulation of genes associated with the thyroid hormone receptors and deiodination. Strong in uence of DCOIT on dre-miR-193b and -499 may be a critical mechanism to inhibit transcription of trαa and trβ, which in turn may affect thyroid hormones and development of the organism. Our ndings suggest that hypothyroidism induced by the exposure to DCOIT is potentially associated with genetic and microRNA-level changes, which eventually affects development.

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Can Encapsulation of the Biocide DCOIT Affect the Anti-Fouling Efficacy and Toxicity on Tropical Bivalves?

Cited by 19 publications

References 35 publications

Antifouling coatings can reduce algal growth while preserving coral settlement

Antifouling coatings can reduce algal growth while preserving coral settlement

Use of Nanotechnology to Mitigate Biofouling in Stainless Steel Devices Used in Food Processing, Healthcare, and Marine Environments

Toxicological signature for thyroid endocrine disruption of dichlorooctylisothiazolinone in zebrafish larvae

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