Severalfungipresenthightolerancetotoxicmetalsandsomeareabletotransformmetalsintometal–oxalatecomplexes.Inthisstudy,theabilityofBeauveriabassianatopro-ducecopperoxalateswasevaluated.Growthperformancewastestedonvariouscopper-containingmedia.B.bassianaprovedhighlyresistanttocopper,toleratingconcentrationsofupto20gL−1,andprecipitatingcopperoxalatesonallmediatested.Chromatographicanalysesshowedthatthisspeciesproducedoxalicacidassolemetalchelator.Theproduc-tionofmetal–oxalatescanbeusedintherestorationandconservationofarcheologicalandmodernmetalartifacts.Theproductionofcopperoxalateswasconfirmeddirectlyusingmetallicpieces(botharcheologicalandmodern).Theconversionofcorrosionproductsintocopperoxalateswasdemonstratedaswell.InordertoassesswhetherthecapabilityofB.bassianatoproducemetal–oxalatescouldbeappliedtoothermetals,ironandsilverweretestedaswell.Ironappearstobedirectlysequesteredinthewallofthefungalhyphaeformingoxalates.However,theformationofahomogeneouslayerontheobjectisnotyetoptimal.Onsilver,aco-precipitationofcopperandsilveroxalatesoccurred.Asthisgreen-ishpatinawouldnotbeacceptableonsilverobjects,silverreductionwasexploredasatarnishingremediation.Firstexperimentsshowedthetransformationofsilvernitrateintonanoparticlesofelementalsilverbyanunknownextracellularmechanism.Theproductionofcopperoxalatesisimmediatelyapplicablefortheconservationofcopper-basedartifacts.Forironandsilverthisisnotyetthecase.However,thevastabilityofB.bassianatotrans-formtoxicmetalsusingdifferentimmobilizationmechanismsseemstoofferconsiderablepossibilitiesforindustrialapplications,suchasthebioremediationofcontaminatedsoilsorthegreensynthesisofchemicals.

Protection of metal artifacts with the formation of metal–oxalates complexes by Beauveria bassiana

JOSEPH, EDITH MICHELLE MARYSE;MAZZEO, ROCCO;
2012

Abstract

Severalfungipresenthightolerancetotoxicmetalsandsomeareabletotransformmetalsintometal–oxalatecomplexes.Inthisstudy,theabilityofBeauveriabassianatopro-ducecopperoxalateswasevaluated.Growthperformancewastestedonvariouscopper-containingmedia.B.bassianaprovedhighlyresistanttocopper,toleratingconcentrationsofupto20gL−1,andprecipitatingcopperoxalatesonallmediatested.Chromatographicanalysesshowedthatthisspeciesproducedoxalicacidassolemetalchelator.Theproduc-tionofmetal–oxalatescanbeusedintherestorationandconservationofarcheologicalandmodernmetalartifacts.Theproductionofcopperoxalateswasconfirmeddirectlyusingmetallicpieces(botharcheologicalandmodern).Theconversionofcorrosionproductsintocopperoxalateswasdemonstratedaswell.InordertoassesswhetherthecapabilityofB.bassianatoproducemetal–oxalatescouldbeappliedtoothermetals,ironandsilverweretestedaswell.Ironappearstobedirectlysequesteredinthewallofthefungalhyphaeformingoxalates.However,theformationofahomogeneouslayerontheobjectisnotyetoptimal.Onsilver,aco-precipitationofcopperandsilveroxalatesoccurred.Asthisgreen-ishpatinawouldnotbeacceptableonsilverobjects,silverreductionwasexploredasatarnishingremediation.Firstexperimentsshowedthetransformationofsilvernitrateintonanoparticlesofelementalsilverbyanunknownextracellularmechanism.Theproductionofcopperoxalatesisimmediatelyapplicablefortheconservationofcopper-basedartifacts.Forironandsilverthisisnotyetthecase.However,thevastabilityofB.bassianatotrans-formtoxicmetalsusingdifferentimmobilizationmechanismsseemstoofferconsiderablepossibilitiesforindustrialapplications,suchasthebioremediationofcontaminatedsoilsorthegreensynthesisofchemicals.
E. Joseph; S. Cario; A. Simon; M. Wörle; R. Mazzeo; P. Junier; D. Job
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/117721
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