Particulate thiols in coastal waters: The effect of light and nutrients on their planktonic production

Matrai, Patricia A.; Vetter, Russell D.

doi:10.4319/lo.1988.33.4.0624

Cited by 31 publications

(32 citation statements)

References 15 publications

(16 reference statements)

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“…Matrai and Vetter (1988) observed that particulate GSH in Saanich Inlet, British Columbia, Canada, showed a subsurface maximum and decreased with depth in close correlation to chlorophyll profiles. In the western North Sea and English Channel, the GSH distribution in surface water from different sites was also found to co-vary with chlorophyll concentrations (AlFarawati and Van Den Berg 2001).…”

Section: Discussionmentioning

confidence: 95%

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Distribution of the thiols glutathione and 3‐mercaptopropionic acid in Connecticut lakes

Mylon

Benoit

2006

Limnology & Oceanography

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The spatiotemporal chemical characteristics of the water column in Linsley Pond, a freshwater lake in Connecticut, were studied from just before its stratification in April through the fall turnover in December. Two low-molecular-weight thiols, glutathione and 3-mercaptopropionic acid (MPA), were detected at nanomolar concentrations in the water column. GSH was detected (average concentrations were ca. 5 nmol L 21 in the particulate phase and ca. 3 nmol L 21 in the dissolved phase) in surface and near-surface waters only and covaried with chlorophyll a. Both particulate and dissolved MPA were measured in the oxic and anoxic regions. In the metalimnion, MPA concentrations were greater than in the oxic water layers above. At times, the MPA concentrations in the metalimnion were as high as those found in the anoxic hypolimnion. The MPA present at different depths in the Linsley Pond water column is most likely produced through dissimilar mechanisms. Throughout the water column, MPA may be a product of the metabolic degradation of sulfur-containing organic compounds; however, in the hypolimnetic waters, dissolved sulfide may play an important role in MPA formation through abiotic nucleophillic addition to unsaturated functionalities in dissolved organic matter. Parallel laboratory experiments were performed to assess the importance of MPA in copper speciation. The results confirmed that despite nanomolar levels in Linsley Pond, MPA does not play an important role in copper speciation. A survey of six additional lakes in Connecticut was made for detectable thiols. Only MPA was detected in four of these lakes, and its distribution was similar to that in Linsley Pond.

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Section: Discussionmentioning

confidence: 95%

“…Another possible source of GSH in the oxic water is bacteria. Bacteria contain GSH and have been postulated to contribute to the observed GSH distributions in Saanich Inlet (Matrai and Vetter 1988).…”

Section: Discussionmentioning

confidence: 99%

Distribution of the thiols glutathione and 3‐mercaptopropionic acid in Connecticut lakes

Mylon

Benoit

2006

Limnology & Oceanography

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“…Microbial pathways for the formation of cysteine, glutathione, and 3-MPA have been well documented in laboratory cultures and in marine sediments (Bird and Moir 1972;Salsbury and Merricks 1975;Kiene and Taylor 1988). Thiols in surface coastal wa- ters have also been attributed to marine phytoplankton (AlFarawati and Van Den Berg 2001;Matrai and Vetter 1988).…”

Section: Resultsmentioning

confidence: 99%

“…Nanomolar to millimolar levels of thiols have been commonly reported in seawater (Matrai and Vetter 1988;Tang et al 2000a;Al-Farawati and van den Berg 2001) and marine sediment interstitial waters (Luther et al 1986; Kiene and Taylor 1988;MacCrehan and Shea 1995). They can be formed via a variety of pathways, including (1) microbial deamination of sulfur-containing amino acids (Bird and Moir 1972;Salsbury and Merricks 1975;Mopper and Taylor 1986), (2) microbial degradation of dimethylsulfoniopropionate (DMSP) (Shea and MacCrehan 1988) produced by marine algae and halophytic plants (Yoch 2002), and (3) abiotic Michael addition reaction between sulfide or polysulfides and unsaturated organic compounds (Mopper and Taylor 1986;Mopper 1987, 1989).…”

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confidence: 99%

Thiols in wetland interstitial waters and their role in mercury and methylmercury speciation

Zhang

Wang

House

et al. 2004

Limnology & Oceanography

116

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Organic sulfhydryl compounds, or thiols, are ligands that strongly complex class B metals such as Hg and methylmercury (MeHg). We determined the concentration profiles of five low-molecular-weight thiols (cysteine, thioglycolic acid, glutathione, N-acetyl-L-cysteine, and 3-mercaptopropionic acid) in sediment interstitial waters, at a vertical resolution of 1 cm, in three contrasting freshwater and brackish wetlands in Canada. All five thiols were detected in the porewaters, with concentrations ranging from nanomolar to submicromolar. In one of the wetlands (Baie St. Francois) the profiles of Hg and MeHg were also obtained at the same vertical resolution. Thermodynamic calculations revealed that at these levels thiols play a negligible role in inorganic Hg speciation in sediment interstitial waters, but they can dominate the MeHg speciation. Consistent with recent findings that intracellular MeHg in fish is dominated by MeHg-thiol complexes, this suggests that thiols also play a significant role in MeHg speciation in the extracellular environment.

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“…Among the numerous organic sulfur compounds, organic sulfhydryls (R-SH) are especially important in biogeochemical cycling of metals in marine and freshwater ecosystems because of the high reactivity of the sulfhydryl group toward metals . Thiols have been shown to play an important role in controlling the bioavailability of trace metals and metalloids (Boulegue et al 1982;Matrai 1988;Lee and Hultberg 1990;Leal et al 1999;Harris et al 2003) in aquatic environments through complexation reactions (Cullen et al 1984;Hu et al 2006). …”

Section: Introductionmentioning

confidence: 99%

Reduced Organic Sulfur: Analyisis and Interaction with Mercury in the Aquatic Environment

Chen¹

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Covalent affinity chromatography-based methods were attempted for analysis of ROS in environmental water samples. A method was developed for analysis of environmental thiols, by preconcentration using affinity covalent chromatographic column or solid phase extraction, followed by releasing of thiols from the thiopropyl sepharose gel using TCEP and analysis using HPLC-UV or HPLC-FL. Under the optimized conditions, the detection limits of the method using HPLC-FL detection were 0.45 and 0.36 nM for Cys and GSH, respectively. Our results suggest that covalent affinity methods are efficient for thiol enrichment and interference elimination, vii demonstrating their promising applications in developing a sensitive, reliable, and useful technique for thiol analysis in environmental water samples.The dissolution of mercury sulfide (HgS) in the presence of ROS and dissolved organic matter (DOM) was investigated, by quantifying the effects of ROS on HgS dissolution and determining the speciation of the mercury released from ROS-induced HgS dissolution. It was observed that the presence of small ROS (e.g., Cys and GSH) and large molecule DOM, in particular at high concentrations, could significantly enhance the dissolution of HgS. The dissolved Hg during HgS dissolution determined using the conventional 0.22 µm cutoff method could include colloidal Hg (e.g., HgS colloids) and truly dissolved Hg (e.g., Hg-ROS complexes). A centrifugal filtration method (with 3 kDa MWCO) was employed to characterize the speciation and reactivity of the Hg released during ROS-enhanced HgS dissolution. The presence of small ROS could produce a considerable fraction (about 40% of total mercury in the solution) of truly dissolved mercury (< 3 kDa), probably due to the formation of Hg-Cys or Hg-GSH complexes. The truly dissolved Hg formed during GSH-or Cys-enhanced HgS dissolution was directly reducible (100% for GSH and 40% for Cys) by stannous chloride, demonstrating its potential role in Hg transformation and bioaccumulation.

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Particulate thiols in coastal waters: The effect of light and nutrients on their planktonic production

Cited by 31 publications

References 15 publications

Distribution of the thiols glutathione and 3‐mercaptopropionic acid in Connecticut lakes

Distribution of the thiols glutathione and 3‐mercaptopropionic acid in Connecticut lakes

Thiols in wetland interstitial waters and their role in mercury and methylmercury speciation

Reduced Organic Sulfur: Analyisis and Interaction with Mercury in the Aquatic Environment

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