The Effect of Metal Ions on the Growth and Ferrous IronOxidation by Leptospirillum ferriphilum CC Isolated from Armenia Mine Sites

Khachatryan, Anna; Vardanyan, Narine; Vardanyan, Arevik; Zhang, Ruiyong; Castro, Laura

doi:10.3390/met11030425

Cited by 6 publications

(4 citation statements)

References 38 publications

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“…albertensis SO-2 (KP455986), and heterotrophic Acidocella sp. RBA (KX784767) isolated by us previously were used [32][33][34][35]. Before bioleaching experiments, L. ferriphilum CC and At.…”

Section: Cultures and Growing Conditionsmentioning

confidence: 99%

“…CC with other strains of L. ferriphilum indicates the high potential of Leptospirillum sp. CC strain in view of biogenic regeneration of concentrated ferric iron (Fe 3+ ) during the bioleaching processes of ores and mineral concentrates [32]. The influence of Fe 2+ /Fe 3+ , as well as Cu, Zn, Ni, and Co ions, on the growth of Leptospirillum sp.…”

Section: Physiological-biochemical Characteristicsmentioning

confidence: 99%

“…This study addresses the characterization and reclassification based on 16S rRNA analysis of the previously isolated and described strain L. ferriphilum CC dominate in a bioleaching pulp of copper concentrate [32]. The objective of this study is to assess the potential of the isolated strain as a promising candidate for the regeneration of ferric iron and biodegradation of sulfide minerals.…”

Section: Introductionmentioning

confidence: 99%

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Bioleaching of Sulfide Minerals by Leptospirillum ferriphilum CC from Polymetallic Mine (Armenia)

et al. 2023

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A strain of Leptospirillum sp. CC previously isolated from Akhtala polymetallic ore (Armenia) was studied. The main morphological and physiological characteristics of CC were revealed. The optimal growth temperature was 40 °C and optimal pH 1.5. A phylogenetic analysis based on 16S rRNA gene sequences (GenBank ID OM272948) showed that isolate CC was clustered with L. ferriphilum and possessed 99.8% sequence similarity with the strain L. ferriphilum OL12-2 (KF356024). The molar fraction of DNA (G+C) of the isolate was 58.5%. Bioleaching experiment indicates that L. ferriphilum CC can oxidize Fe(II) efficiently, and after 17 days, 44.1% of copper and 91.4% of iron are extracted from chalcopyrite and pyrite, respectively. The efficiency of L. ferriphilum CC in pyrite oxidation increases 1.7 times when co-cultivated with At. ferrooxidans ZnC. However, the highest activity in pyrite oxidation shows the association of L.ferriphilum CC with heterotrophic Acidocella sp. RBA bacteria. It was shown that bioleaching of copper and iron from chalcopyrite by association of L. ferriphilum CC, At. ferrooxidans ZnC, and At. albertensis SO-2 in comparison with pure culture L. ferriphilum CC for 21 days increased about 1.2 and 1.4–1.6 times, respectively.

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Section: Cultures and Growing Conditionsmentioning

confidence: 99%

Section: Physiological-biochemical Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bioleaching of Sulfide Minerals by Leptospirillum ferriphilum CC from Polymetallic Mine (Armenia)

et al. 2023

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“…Khachatryan et al [4] studied the potential of the newly isolated strain Leptospirillum ferriphilum CC for bioleaching of pyrite and chalcopyrite in pure mixed culture with other iron-and/or sulfur-oxidizing bacteria. Microbial Fe 2+ oxidation was competitively inhibited by Fe 3+ , and the presence of heavy metal ions influenced the oxidation of Fe 2+ by L. ferriphilum CC (toxicity: Co > Zn > Ni > Cu).…”

Section: Bioleachingmentioning

confidence: 99%