Luminescence Studies of Metal Ion-Binding Sites on Datura innoxia Biomaterial

Ke, Huei-Yang D.; Anderson, Wendy L.; Moncrief, Robyn M.; Rayson, Gary D.; Jackson, Paul J.

doi:10.1021/es00053a009

Cited by 44 publications

(36 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many cations of environmental interest that bind weakly to hard ligands also bind weakly to soft ligands . Blamey et al suggested that it is possible that Ag + binds strongly to soft ligands within the cell wall (including sulfhydryl groups, olefins, or aromatic groups ) or with the (hard) carboxyl groups of IAA. Both possibilities would interfere with cell‐wall loosening, thereby causing ruptures.…”

Section: Exceptions and Special Casesmentioning

confidence: 99%

The rhizotoxicity of metal cations is related to their strength of binding to hard ligands

Kopittke

Menzies

Wang

et al. 2014

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

Mechanisms whereby metal cations are toxic to plant roots remain largely unknown. Aluminum, for example, has been recognized as rhizotoxic for approximately 100 yr, but there is no consensus on its mode of action. The authors contend that the primary mechanism of rhizotoxicity of many metal cations is nonspecific and that the magnitude of toxic effects is positively related to the strength with which they bind to hard ligands, especially carboxylate ligands of the cell-wall pectic matrix. Specifically, the authors propose that metal cations have a common toxic mechanism through inhibiting the controlled relaxation of the cell wall as required for elongation. Metal cations such as Al 3þ and Hg 2þ , which bind strongly to hard ligands, are toxic at relatively low concentrations because they bind strongly to the walls of cells in the rhizodermis and outer cortex of the root elongation zone with little movement into the inner tissues. In contrast, metal cations such as Ca 2þ , Na þ , Mn 2þ , and Zn 2þ , which bind weakly to hard ligands, bind only weakly to the cell wall and move farther into the root cylinder. Only at high concentrations is their weak binding sufficient to inhibit the relaxation of the cell wall. Finally, different mechanisms would explain why certain metal cations (for example, Tl þ , Ag þ , Cs þ , and Cu 2þ ) are sometimes more toxic than expected through binding to hard ligands. The data presented in the present study demonstrate the importance of strength of binding to hard ligands in influencing a range of important physiological processes within roots through nonspecific mechanisms. Environ Toxicol Chem 2014;33:268-277. # 2013 SETAC

show abstract

Section: Exceptions and Special Casesmentioning

confidence: 99%

The rhizotoxicity of metal cations is related to their strength of binding to hard ligands

Kopittke

Menzies

Wang

et al. 2014

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

show abstract

“…Biological systems that include fungi, algae (Mattuschka et al, 1993;Volesky and Holan, 1995;Mullen et al, 1992;Omar et al, 1997), and the dead biomass of Datura innoxia (Drake et al, 1996;Ke et al, 1994) have demonstrated the ability to uptake silver ions from contaminated aqueous solutions. Previous studies have shown that alfalfa biomass has the capability to recover heavy metal ions, such as Cu(II), Cd(II), Zn(II), Pb(II), and Cr(III), from aqueous solutions.…”

Section: Journal Of Hazardous Substance Research 1-2mentioning

confidence: 99%

Binding of Silver(I) Ions by Alfalfa Biomass (Medicago Sativa): Batch PH, Time, Temperature, and Ionic Strength Studies

Herrera¹,

Gardea‐Torresdey²,

Tiemann³

et al. 2003

Journal of Hazardous Substance Research

View full text Add to dashboard Cite

“…As expected, a major retardation of elution profile by the packed column relative to the empty column was observed, this was considered to be due to the binding of Ag + with the immobilized particulates in the packed column. Accurate determination of the dead volume of the column was difficult due to strong binding of Ag + at very low pH (Ke et al, 1994). In this study, the elution volume from the elution profile obtained by letting the same influent solution pass through the empty column was approximated as tje dead volume (Lin et al, 1996).…”

Section: Resultsmentioning

confidence: 99%

Using frontal affinity chromatography to study how silver binds with particulates

Yurong

2010

Chin. J. Geochem.

View full text Add to dashboard Cite

Frontal affinity chromatography was applied to characterizing the mechanism of binding of silver with sediment particulates collected from Lake Ontario, Canada. The results showed that there was one major binding site for Ag + in the particulates. The binding capacity ranges from 6.06 to 1.01 μ·mol·g -1 , and the binding constant (lgK) from 6.23 to 7.43 M -1 in 0.005 M ion strength at pH=3-7. The binding capacity and affinity constant were found to be pH-dependent. It is suggested that the particulate surface site where silver was bound was the anionic base. This study would be helpful for better understanding of the fundamental environmental chemistry of silver in sediments.

show abstract

Luminescence Studies of Metal Ion-Binding Sites on Datura innoxia Biomaterial

Cited by 44 publications

References 23 publications

The rhizotoxicity of metal cations is related to their strength of binding to hard ligands

The rhizotoxicity of metal cations is related to their strength of binding to hard ligands

Binding of Silver(I) Ions by Alfalfa Biomass (Medicago Sativa): Batch PH, Time, Temperature, and Ionic Strength Studies

Using frontal affinity chromatography to study how silver binds with particulates

Contact Info

Product

Resources

About