Surface charges and interfaces: implications for mineral roles in prebiotic chemistry

Detalhes bibliográficos
Autor(a) principal: PONTES-BUARQUE,MILA
Data de Publicação: 2000
Outros Autores: TESSIS,ANA C., BONAPACE,JOSÉ A. P., MONTE,MARISA B. M., SOUZA-BARROS,FERNANDO DE, VIEYRA,ADALBERTO
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Anais da Academia Brasileira de Ciências (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300005
Resumo: There exists an extensive literature on the possible roles of minerals in the prebiotic stages of the chemical evolution of life (Bernal 1951, Cairns-Smith 1982, Wächtershäuser 1992, Vieyra et al. 1995, Tessis et al. 1999, see Lahav (1994) for a review). Among the original proposals, minerals have been considered in: (a) processes that would discriminate molecular chirality; (b) condensation reactions of biomolecular precursors; (c) prebiotic catalysis; (d) biochemical templates; and (e) autocatalytic metabolism. In this communication it is emphazised the complex properties of both surface reactions and interfaces between minerals and aqueous solutions simulating Archean scenarios. The properties of pyrite surface net charge and of its interface with a solution simulating primitive seawater are discussed and their implications to the autocatalytic model (Wächtershäuser 1988a 1992) are presented in order to demonstrate their relevance. The proposed roles of iron-sulfide minerals (mainly pyrite) as physical support for primitive bidimensional metabolism and chiral discriminator (Wächtershäuser 1988a, Huber & Wächtershäuser 1998) are revised. It is shown that: (a) the net surface charge can be modulated by the pyrite-aqueous solution interface; (b) mononucleotides attachment to pyrite require a cationic bridge; and (c) direct absorption of acetate - a molecule proposed as carbon source in primitive aqueous environments - also modulates the interface properties and would have masked pyrite's bulk structure. These results indicate that physicochemical changes of mineral surfaces - caused by environments simulating Archean aqueous scenarios - should be taken into account in the proposals of mineral prebiotic roles.
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spelling Surface charges and interfaces: implications for mineral roles in prebiotic chemistryprebiotic reactionsmineral interfacessurface reactionsThere exists an extensive literature on the possible roles of minerals in the prebiotic stages of the chemical evolution of life (Bernal 1951, Cairns-Smith 1982, Wächtershäuser 1992, Vieyra et al. 1995, Tessis et al. 1999, see Lahav (1994) for a review). Among the original proposals, minerals have been considered in: (a) processes that would discriminate molecular chirality; (b) condensation reactions of biomolecular precursors; (c) prebiotic catalysis; (d) biochemical templates; and (e) autocatalytic metabolism. In this communication it is emphazised the complex properties of both surface reactions and interfaces between minerals and aqueous solutions simulating Archean scenarios. The properties of pyrite surface net charge and of its interface with a solution simulating primitive seawater are discussed and their implications to the autocatalytic model (Wächtershäuser 1988a 1992) are presented in order to demonstrate their relevance. The proposed roles of iron-sulfide minerals (mainly pyrite) as physical support for primitive bidimensional metabolism and chiral discriminator (Wächtershäuser 1988a, Huber & Wächtershäuser 1998) are revised. It is shown that: (a) the net surface charge can be modulated by the pyrite-aqueous solution interface; (b) mononucleotides attachment to pyrite require a cationic bridge; and (c) direct absorption of acetate - a molecule proposed as carbon source in primitive aqueous environments - also modulates the interface properties and would have masked pyrite's bulk structure. These results indicate that physicochemical changes of mineral surfaces - caused by environments simulating Archean aqueous scenarios - should be taken into account in the proposals of mineral prebiotic roles.Academia Brasileira de Ciências2000-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300005Anais da Academia Brasileira de Ciências v.72 n.3 2000reponame:Anais da Academia Brasileira de Ciências (Online)instname:Academia Brasileira de Ciências (ABC)instacron:ABC10.1590/S0001-37652000000300005info:eu-repo/semantics/openAccessPONTES-BUARQUE,MILATESSIS,ANA C.BONAPACE,JOSÉ A. P.MONTE,MARISA B. M.SOUZA-BARROS,FERNANDO DEVIEYRA,ADALBERTOeng2000-10-05T00:00:00Zoai:scielo:S0001-37652000000300005Revistahttp://www.scielo.br/aabchttps://old.scielo.br/oai/scielo-oai.php||aabc@abc.org.br1678-26900001-3765opendoar:2000-10-05T00:00Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)false
dc.title.none.fl_str_mv Surface charges and interfaces: implications for mineral roles in prebiotic chemistry
title Surface charges and interfaces: implications for mineral roles in prebiotic chemistry
spellingShingle Surface charges and interfaces: implications for mineral roles in prebiotic chemistry
PONTES-BUARQUE,MILA
prebiotic reactions
mineral interfaces
surface reactions
title_short Surface charges and interfaces: implications for mineral roles in prebiotic chemistry
title_full Surface charges and interfaces: implications for mineral roles in prebiotic chemistry
title_fullStr Surface charges and interfaces: implications for mineral roles in prebiotic chemistry
title_full_unstemmed Surface charges and interfaces: implications for mineral roles in prebiotic chemistry
title_sort Surface charges and interfaces: implications for mineral roles in prebiotic chemistry
author PONTES-BUARQUE,MILA
author_facet PONTES-BUARQUE,MILA
TESSIS,ANA C.
BONAPACE,JOSÉ A. P.
MONTE,MARISA B. M.
SOUZA-BARROS,FERNANDO DE
VIEYRA,ADALBERTO
author_role author
author2 TESSIS,ANA C.
BONAPACE,JOSÉ A. P.
MONTE,MARISA B. M.
SOUZA-BARROS,FERNANDO DE
VIEYRA,ADALBERTO
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv PONTES-BUARQUE,MILA
TESSIS,ANA C.
BONAPACE,JOSÉ A. P.
MONTE,MARISA B. M.
SOUZA-BARROS,FERNANDO DE
VIEYRA,ADALBERTO
dc.subject.por.fl_str_mv prebiotic reactions
mineral interfaces
surface reactions
topic prebiotic reactions
mineral interfaces
surface reactions
description There exists an extensive literature on the possible roles of minerals in the prebiotic stages of the chemical evolution of life (Bernal 1951, Cairns-Smith 1982, Wächtershäuser 1992, Vieyra et al. 1995, Tessis et al. 1999, see Lahav (1994) for a review). Among the original proposals, minerals have been considered in: (a) processes that would discriminate molecular chirality; (b) condensation reactions of biomolecular precursors; (c) prebiotic catalysis; (d) biochemical templates; and (e) autocatalytic metabolism. In this communication it is emphazised the complex properties of both surface reactions and interfaces between minerals and aqueous solutions simulating Archean scenarios. The properties of pyrite surface net charge and of its interface with a solution simulating primitive seawater are discussed and their implications to the autocatalytic model (Wächtershäuser 1988a 1992) are presented in order to demonstrate their relevance. The proposed roles of iron-sulfide minerals (mainly pyrite) as physical support for primitive bidimensional metabolism and chiral discriminator (Wächtershäuser 1988a, Huber & Wächtershäuser 1998) are revised. It is shown that: (a) the net surface charge can be modulated by the pyrite-aqueous solution interface; (b) mononucleotides attachment to pyrite require a cationic bridge; and (c) direct absorption of acetate - a molecule proposed as carbon source in primitive aqueous environments - also modulates the interface properties and would have masked pyrite's bulk structure. These results indicate that physicochemical changes of mineral surfaces - caused by environments simulating Archean aqueous scenarios - should be taken into account in the proposals of mineral prebiotic roles.
publishDate 2000
dc.date.none.fl_str_mv 2000-09-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0001-37652000000300005
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dc.publisher.none.fl_str_mv Academia Brasileira de Ciências
publisher.none.fl_str_mv Academia Brasileira de Ciências
dc.source.none.fl_str_mv Anais da Academia Brasileira de Ciências v.72 n.3 2000
reponame:Anais da Academia Brasileira de Ciências (Online)
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reponame_str Anais da Academia Brasileira de Ciências (Online)
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