Characterization of the nickel-rich extract from the nickel hyperaccumulator Dichapetalum gelonioides

Homer, Faye A.; Reeves, Roger D.; Brooks, Robert R.; Baker, A. J. M.

doi:10.1016/0031-9422(91)83602-h

Cited by 69 publications

(34 citation statements)

References 17 publications

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“…6). The Ca concentrations accumulated by B. coddii are similar to those found in other Ni hyperaccumulator plants collected from natural ultramafic and serpentine environments (Homer et al, 1991;Robinson et al, 1997a), even though soils rich in Ni are generally characterized by low Ca contents. Ca accumulation has been observed in association with Ni in several Ni hyperaccumulator species (Farago et al, 1977;Homer et al, 1991;Krämer et al, 1997;Sagner et al, 1998).…”

Section: Discussionmentioning

confidence: 82%

“…The Ca concentrations accumulated by B. coddii are similar to those found in other Ni hyperaccumulator plants collected from natural ultramafic and serpentine environments (Homer et al, 1991;Robinson et al, 1997a), even though soils rich in Ni are generally characterized by low Ca contents. Ca accumulation has been observed in association with Ni in several Ni hyperaccumulator species (Farago et al, 1977;Homer et al, 1991;Krämer et al, 1997;Sagner et al, 1998). Minimizing the effective Ca concentration in soil, for example, by acidification and leaching, selective Ni chelation, or avoiding Ca-containing fertilizers, has been recognized in several phytoremediation and phytomining studies to improve the bioavailability of Ni and/or prevent inhibition of Ni accumulation by plants (Chaney et al, 1999;Robinson et al, 1997a).…”

Section: Discussionmentioning

confidence: 82%

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Production of nickel bio‐ore from hyperaccumulator plant biomass: Applications in phytomining

Boominathan

Saha-Chaudhury

Sahajwalla

et al. 2004

Biotech & Bioengineering

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An important step in phytomining operations is the recovery of metal from harvested plant material. In this work, a laboratory-scale horizontal tube furnace was used to generate Ni-enriched bio-ore from the dried biomass of Ni hyperaccumulator plants. Prior to furnace treatment, hairy roots of Alyssum bertolonii were exposed to Ni in liquid medium to give biomass Ni concentrations of 1.9% to 7.7% dry weight; whole plants of Berkheya coddii were grown in Ni-containing soil to produce above-ground Ni levels of up to 0.49% dry weight. The concentration of Ca in the Ni-treated B. coddii biomass was about 15 times greater than in A. bertolonii. After furnace treatment at 1200 degrees C under air, Ni-bearing residues with crystalline morphology and containing up to 82% Ni were generated from A. bertolonii. The net weight loss in the furnace and the degree of concentration of Ni were significantly reduced when the furnace was purged with nitrogen, reflecting the importance of oxidative processes in Ni enrichment. Ni in the B. coddii biomass was concentrated by a factor of about 17 to yield a residue containing 8.6% Ni; this bio-ore Ni content is substantially higher than the 1% to 2% Ni typically found in mined ore. However, the B. coddii samples after furnace treatment also contained about 34% Ca, mainly in the form of hydroxyapatite Ca(5)(PO(4))(3)OH. Such high Ca levels may present significant challenges for further metallurgical processing. This work demonstrates the feasibility of furnace treatment for generating Ni-rich bio-ore from hyperaccumulator plants. The results also suggest that minimizing the uptake of Ca and/or reducing the Ca content of the biomass prior to furnace treatment would be a worthwhile strategy for improving the quality of Ni bio-ore produced in phytomining operations.

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Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 82%

Production of nickel bio‐ore from hyperaccumulator plant biomass: Applications in phytomining

Boominathan

Saha-Chaudhury

Sahajwalla

et al. 2004

Biotech & Bioengineering

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“…Several reports have suggested that metals are detoxified in hyperaccumulators by binding with low-molecular-weight ligands such as histidine (Krämer et al, 1996) or organic acids such as citric, malic and malonic acids (Kersten et al, 1980;Sagner et al, 1998;Tolrà et al, 1996b). However, complexation with such universal plant metabolites is considered by some researchers to be insufficient explanation for the special properties of hyperaccumulator plants, including their metal specificity (Homer et al, 1991). Other mechanisms that could be involved in hyperaccumulation include metal translocation within the plant (Krämer et al, 1996;Tolrà et al, 1996a) and compartmentation within the cells, for example, in vacuoles (Vázquez et al, 1992).…”

Section: Current Technologies To Decrease Dietary Toxicity Of Heavy Mmentioning

confidence: 99%

Assessing potential dietary toxicity of heavy metals in selected vegetables and food crops

Islam

Yang

et al. 2007

J. Zhejiang Univ. - Sci. B

236

123

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Abstract:Heavy metals, such as cadmium, copper, lead, chromium and mercury, are important environmental pollutants, particularly in areas with high anthropogenic pressure. Their presence in the atmosphere, soil and water, even in traces can cause serious problems to all organisms, and heavy metal bioaccumulation in the food chain especially can be highly dangerous to human health. Heavy metals enter the human body mainly through two routes namely: inhalation and ingestion, ingestion being the main route of exposure to these elements in human population. Heavy metals intake by human populations through food chain has been reported in many countries. Soil threshold for heavy metal toxicity is an important factor affecting soil environmental capacity of heavy metal and determines heavy metal cumulative loading limits. For soil-plant system, heavy metal toxicity threshold is the highest permissible content in the soil (total or bioavailable concentration) that does not pose any phytotoxic effects or heavy metals in the edible parts of the crops does not exceed food hygiene standards. Factors affecting the thresholds of dietary toxicity of heavy metal in soil-crop system include: soil type which includes soil pH, organic matter content, clay mineral and other soil chemical and biochemical properties; and crop species or cultivars regulated by genetic basis for heavy metal transport and accumulation in plants. In addition, the interactions of soil-plant root-microbes play important roles in regulating heavy metal movement from soil to the edible parts of crops. Agronomic practices such as fertilizer and water managements as well as crop rotation system can affect bioavailability and crop accumulation of heavy metals, thus influencing the thresholds for assessing dietary toxicity of heavy metals in the food chain. This paper reviews the phytotoxic effects and bioaccumulation of heavy metals in vegetables and food crops and assesses soil heavy metal thresholds for potential dietary toxicity.

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“…Citrate and malate have been found in Ni hyperaccumulators (Homer et al, 1991 ;Sagner et al, 1998). Some Cutolerant (fungicide tolerant) wood-rotting fungi are able to produce large amounts of oxalic acid, which forms Cu oxalates, but no direct correlation between oxalic acid production and Cu tolerance has been shown (see Dutton & Evans, 1996).…”

Section: mentioning

confidence: 99%

Organic acids produced by mycorrhizal Pinus sylvestris exposed to elevated aluminium and heavy metal concentrations

Ahonen-Jonnarth¹,

Hees²,

Lundström³

et al. 2000

New Phytologist

186

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A cultivation method was developed to enable exposure of ectomycorrhizal plants with intact extramatrical mycelium to solutions containing different concentrations of aluminium or heavy metals. Pinus sylvestris seedlings colonized by Suillus variegatus (two isolates), Rhizopogon roseolus or Paxillus involutus (two isolates) were used. Seedlings were transferred to Petri dishes containing glass beads and exposed to elevated concentrations of Al, Cd, Cu, or Ni in two ways : immediately following transfer ; and after allowing mycorrhizal seedlings to develop an extraradical mycelium that colonized the interface between the upper surface of the beads and the metalcontaining solution. Production of organic acids in mycorrhizal and non-mycorrhizal systems was measured by withdrawing samples from the solution and analyzing by HPLC. In most experiments, levels of oxalic acid were significantly higher in mycorrhizal treatments than in non-mycorrhizal controls. The measured levels of organic acids were variable, but the results obtained suggest that production of oxalic acid is stimulated by exposure to elevated Al in mycorrhizal seedlings colonized by S. variegatus and R. roseolus. Elevated Al concentrations also increased oxalic acid production by non-mycorrhizal seedlings significantly in two of four Al experiments performed, but the measured concentrations were significantly lower than in corresponding mycorrhizal treatments in both cases. Malonic acid was found in the culture solution of non-mycorrhizal and P. involutuscolonized seedlings, but only trace amounts were found in S. variegatus or R. roseolus-infected seedlings. Citric, shikimic, lactic, acetic, propionic, fumaric, formic, iso-butyric and butyric acid were found in variable concentrations. Production of oxalic acid by seedlings colonized by S. variegatus BL or P. involutus was not stimulated by exposure to 0.44 µM Cd or 17 µM Ni. Exposure to 0.157 mM Cu in two separate experiments using P. involutus 87.017 and two strains of S. variegatus (BL and I59) appeared to stimulate production of oxalic acid irrespective of mycorrhizal status or species.

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Characterization of the nickel-rich extract from the nickel hyperaccumulator Dichapetalum gelonioides

Cited by 69 publications

References 17 publications

Production of nickel bio‐ore from hyperaccumulator plant biomass: Applications in phytomining

Production of nickel bio‐ore from hyperaccumulator plant biomass: Applications in phytomining

Assessing potential dietary toxicity of heavy metals in selected vegetables and food crops

Organic acids produced by mycorrhizal Pinus sylvestris exposed to elevated aluminium and heavy metal concentrations

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