Imposex and organotin compounds in marine gastropods and sediments from the Mar del Plata coast, Argentina

Cledón, Maximiliano; Theobald, Norbert; Gerwinski, Wolfgang; Penchaszadeh, Pablo E.

doi:10.1017/s002531540601366x

Cited by 31 publications

(27 citation statements)

References 16 publications

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“…[18][19][20] For instance, recent studies have shown that OTCs exposure induces masculinization (imposex) in several mollusca species because of DNA damage-induced errors of replication, also disrupts the antioxidant defense system of some species of mollusca and fish, and eventually causes apoptosis (cell death). [21][22][23] Although the effects of long-term human exposure to OTCs at environmentally realistic levels are unknown, the available information on mammalian toxicity, derived largely from animal and in vitro research, clearly suggest that there are potential risks. Hence, replacement by novel environmentally friendly catalysts for the transesterification is eagerly needed.…”

Section: Introductionmentioning

confidence: 99%

Dioxomolybdenum(VI) and dioxotungsten(VI) complexes: efficient catalytic activity for crosslinking reaction in ethylene‐vinyl acetate copolymer/alkoxysilane composites

Adachi

Toyomura

Miyakuni

et al. 2015

Polymers for Advanced Techs

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The catalytic performances of several bis(acetylacetonato)metal complexes [Cu(acac) 2 , Zn(acac) 2 , TiO(acac) 2 , VO (acac) 2 , MoO 2 (acac) 2 , and WO 2 (acac) 2 ] were investigated for the crosslinking reaction via transesterifications in the ethylene-vinyl acetate copolymer/tetraethoxysilane (EVA/TEOS) composite system by means of dynamic attenuated total reflectance Fourier transform infrared, solvent swelling, and solid-state 29 Si cross polarization/magic angle spinning nuclear magnetic resonance techniques. Results of the kinetic examination revealed that MoO 2 (acac) 2 and WO 2 (acac) 2 exhibited a higher catalytic activity than di-n-butyltin(IV) oxide, which is a catalyst most commonly used for the transesterification process in polymer system, but has a toxic effect on the environmental health. And furthermore, the crosslink density and final siloxane network structure of crosslinked EVA/TEOS composites are found to be greatly correlated with the catalyst used. On the basis of the S N 2-Si pathway, a plausible catalytic mechanism of MoO 2 (acac) 2 and WO 2 (acac) 2 was proposed for the crosslinking reaction via transesterifications of the vinyl acetate moieties in EVA backbone with the ethoxysilane groups in one TEOS molecule. The findings in this study may fill the blank in the high performance and environmentally friendly catalyst in the field of the crosslinking reactions in polymer system and provide useful clue for other transesterifications.

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Section: Introductionmentioning

confidence: 99%

Dioxomolybdenum(VI) and dioxotungsten(VI) complexes: efficient catalytic activity for crosslinking reaction in ethylene‐vinyl acetate copolymer/alkoxysilane composites

Adachi

Toyomura

Miyakuni

et al. 2015

Polymers for Advanced Techs

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“…[12][13][14] However, OTCs are toxics; it has been shown to be potentially carcinogenic. [15][16][17] Hence, safer catalysts by more environmental friendly are eagerly desired.…”

Section: Introductionmentioning

confidence: 99%

The utility of sulfonic acid catalysts for silane water-crosslinked network formation in the ethylene–propylene copolymer system

Adachi

Hirano²

2008

J Sol-Gel Sci Technol

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Catalytic effects of Brönsted acid on the early kinetics of water-crosslinking reaction in the vinyltrimethoxysilane-grafted ethylene-propylene copolymer (EPR-g-VTMS) system were investigated by means of an attenuated total reflectance-Fourier transform infrared (ATR-FTIR) technique and gel fraction measurements. Four sulfonic acids with different substituent, including methanesulfonic acid (C1SO 3 H), 1-propanesulfonic acid (C3SO 3 H), 1-pentanesulfonic acid (C5SO 3 H), and dodecylbenzenesulfonic acid (C12PhSO 3 H), were selected to examine the progress and effect of progressive changes in the silane watercrosslinked network structure in comparison with a primary amine (n-octadecylamine, Lewis base). From the kinetic analysis using Arrhenius equation, we found that the frequency factors for both hydrolysis (ATR-FTIR) and condensation step (gel content) of EPR-g-VTMS decreased in the order of C1SO 3 H > C3SO 3 H > C5SO 3 H > C12PhSO 3 H, while the activation energy values for each reaction did not differ significantly.These relationships can be explained mainly on the basis of the diffusion factors of the sulfonic acids in EPRg-VTMS system. Moreover, the stress-strain curve comparison between water-crosslinked EPR-g-VTMS samples containing sulfonic acid and amine compound clearly indicated the difference in their tensile properties as a result of the catalyst variation; the use of sulfonic acid as water-crosslinking catalyst eventually achieves to the soft and tough water-crosslinked EPR-g-VTMS, while the hard and strong one was produced using amine catalyst. Not only the catalytic activity but also the type of the catalyst has eventually significant effects upon the physical properties of the water-crosslinked EPR-g-VTMS.3/32

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“…Similar results were found by Cledón et al (2005) in a population of the snail Adelomelon brasiliana in the same area. On the other hand, the neoformation of multiple penises in females indicates that the sensitivity to TBT is higher in O. deshayesiana than in other snails from the same area, such as Buccinanops monilifer and A. brasiliana, which had lower percentages of impo sex and RPSI values (Cledón et al 2006.…”

Section: Population Structurementioning

confidence: 93%

Reproductive cycle in an imposex-affected population of Olivancillaria deshayesiana (Gastropoda: Olividae) from Mar del Plata, Argentina

Teso¹,

Arrighetti²,

Penchaszadeh³

2012

Aquat. Biol.

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Olivancillaria deshayesiana (Gastropoda: Olividae) is distributed from Ilha Grande (Rio de Janeiro, Brazil) to Necochea (Buenos Aires, Argentina). Apart from some descriptions of the embryonic development and the egg capsules, little is known about the reproduction and ecology of this species. In this 2 yr study (October 2005 to September 2007, the reproductive cycle of O. deshayesiana was examined in a population highly affected by imposex, from the Mar del Plata coast, Argentina. Males exhibited seasonal reproductive activity, with a major spawning period from September to January (spring to early summer) for the 2 yr, which coincided with an increase in seawater temperature and photoperiod. In contrast, females were mature and capable of spawning year round, with a major spawning period from September to January (spring to early summer), simultaneous with the major spawning period of males.KEY WORDS: Imposex · Mar del Plata · Olivancillaria · Olividae · Reproduction Resale or republication not permitted without written consent of the publisherAquat Biol 15: [111][112][113][114][115][116][117][118][119] 2012 this species may grow to a total shell length of 31 mm in about 10 yr. The aim of our study was to describe the gonadal structure and reproductive cycle of O. deshayesiana, and to provide new information on the occurrence of imposex in a population in the Mar del Plata area, Argentina. MATERIALS AND METHODS SamplingMar del Plata (38°20' S, 57°37' W) is an open coast and the site of the most important coastal fishery fleet of Argentina (Penchaszadeh et al. 2001). In this area, water temperature ranges seasonally between 8.4 and 20.8°C and salinity is rather constant at 33.8 ‰ (www. iafe.uba.ar/tele/Antares_argentina/; Guerrero & Piola 1997).Specimens of Olivancillaria deshayesiana were collected monthly by bottom trawling (3 m mouth opening, 15 mm mesh size) off Mar del Plata City between 5 and 12 m deep from October 2005 to September 2007. Approximately 20 snails were caught each month and taken to the laboratory, where the shell was separated from the soft body. Shell length (SL) was measured with a Vernier caliper to the nearest 1 mm, and the shell-free wet mass (SFWM) was weighed to the nearest 0.1 g. To establish the morphometric relationship between SL and SFWM for each sex, linear regression analyses were performed using log(SFWM) = log(a) + b × log(SL). Parallelism tests and analysis of covariance (ANCOVA) were performed to compare the relationship between SFWM and SL between sexes (Sokal & Rohlf 1995). A chi-squared test was used to test for significant differences in sex ratio. Statistical analysis was carried out with the software Statistica v. 6.0.Recently, Teso & Penchaszadeh (2009) reported that this population is affected by imposex, and on this account animals were sexed by differences in gonad color and the presence (females) or absence (males) of internal sexual glands such as capsule and albumen glands. Sex was confirmed by the histological examination of gonad sections under...

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Imposex and organotin compounds in marine gastropods and sediments from the Mar del Plata coast, Argentina

Cited by 31 publications

References 16 publications

Dioxomolybdenum(VI) and dioxotungsten(VI) complexes: efficient catalytic activity for crosslinking reaction in ethylene‐vinyl acetate copolymer/alkoxysilane composites

Dioxomolybdenum(VI) and dioxotungsten(VI) complexes: efficient catalytic activity for crosslinking reaction in ethylene‐vinyl acetate copolymer/alkoxysilane composites

The utility of sulfonic acid catalysts for silane water-crosslinked network formation in the ethylene–propylene copolymer system

Reproductive cycle in an imposex-affected population of Olivancillaria deshayesiana (Gastropoda: Olividae) from Mar del Plata, Argentina

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