Publicação
Spectroscopic characterization of natural dyes by their non-invasive identification on pre-Columbian codices: the Maya yellow
| Resumo: | Mesoamerican cultures had a strong tradition of written and pictorial manuscripts, called the codices. In studies already performed it was found the use of Maya Blue, made from a mixture of indigo and a clay called palygorskite, forming an incredibly stable material where the dye is trapped inside the nanotubes of the clay, after heating. However, a bigger challenge lies in the study of the yellows used, for these civilizations might have used this clay-dye mixture to produce their yellow colorants. As a first step, it was possible to provide identification, by non-invasive methods, of two colorants (a flavonoid and a carotenoid). While the flavonoid absorbed between 368-379 nm, the carotenoid would absorb around 455 nm. A temperature study also conducted allowed to set 140ºC as the desirable temperature to heat the samples without degrading them. FT-IR, conventional Raman and SERS allowed us to understand the existence of a reaction between the dyes and the clays (palygorskite and kaolinite), however it is difficult to understand it in a molecular point of view. As a second step, five species of Mexican dyes were selected on the basis of historical sources. The Maya yellow samples were produced adapting the recipe proposed by Reyes-Valerio, supporting the yellow dyes extracted from the dried plants on the clays, with addition of water, and then heated at 140ºC. It was found that the addition of water in palygorskite would increase the pH, hence deprotonating the molecules having a clear negative effect in the color. A second recipe was developed, without the addition of water; however, it was found that the use of water based binders would still alter the color of the samples with palygorskite. In this case, kaolinite without heating yield better results as a Maya yellow hybrid. It was found that the Maya chemistry might not have been the same for all the colors. The Mesoamericans might have found that different dyes could work better to their desires if matched with different clays. It was noticeable that for a clear distinction between flavonoids and carotenoids the reflectance and emission studies suffice, but when clay is added, Raman techniques will perform better. For this reason, conventional Raman and SERS were employed in order to create a database for the Mesoamerican dyestuffs for a future identification. |
|---|---|
| Autores principais: | Nabais, Paula Sofia Fonseca |
| Assunto: | Maya blue Maya yellow Dye-clay hybrids Pre-Columbian codices Flavonoids Carotenoids |
| Ano: | 2014 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade Nova de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório Institucional da UNL |
| _version_ | 1868983326531911680 |
|---|---|
| author | Nabais, Paula Sofia Fonseca |
| author_facet | Nabais, Paula Sofia Fonseca |
| author_role | author |
| contributor_name_str_mv | Miliani, Costanza Romani, Aldo RUN |
| country_str | PT |
| creators_json_txt | [{\"Person.name\":\"Nabais, Paula Sofia Fonseca\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Miliani, Costanza Romani, Aldo RUN |
| datacite.creators.creator.creatorName.fl_str_mv | Nabais, Paula Sofia Fonseca |
| datacite.date.Accepted.fl_str_mv | 2014-07-01T00:00:00Z |
| datacite.date.available.fl_str_mv | 2014-11-04T10:11:07Z |
| datacite.date.embargoed.fl_str_mv | 2014-11-04T10:11:07Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | Maya blue Maya yellow Dye-clay hybrids Pre-Columbian codices Flavonoids Carotenoids |
| datacite.titles.title.fl_str_mv | Spectroscopic characterization of natural dyes by their non-invasive identification on pre-Columbian codices: the Maya yellow |
| dc.contributor.none.fl_str_mv | Miliani, Costanza Romani, Aldo RUN |
| dc.creator.none.fl_str_mv | Nabais, Paula Sofia Fonseca |
| dc.date.Accepted.fl_str_mv | 2014-07-01T00:00:00Z |
| dc.date.available.fl_str_mv | 2014-11-04T10:11:07Z |
| dc.date.embargoed.fl_str_mv | 2014-11-04T10:11:07Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10362/13591 |
| dc.language.none.fl_str_mv | eng |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.subject.none.fl_str_mv | Maya blue Maya yellow Dye-clay hybrids Pre-Columbian codices Flavonoids Carotenoids |
| dc.title.fl_str_mv | Spectroscopic characterization of natural dyes by their non-invasive identification on pre-Columbian codices: the Maya yellow |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_bdcc |
| description | Mesoamerican cultures had a strong tradition of written and pictorial manuscripts, called the codices. In studies already performed it was found the use of Maya Blue, made from a mixture of indigo and a clay called palygorskite, forming an incredibly stable material where the dye is trapped inside the nanotubes of the clay, after heating. However, a bigger challenge lies in the study of the yellows used, for these civilizations might have used this clay-dye mixture to produce their yellow colorants. As a first step, it was possible to provide identification, by non-invasive methods, of two colorants (a flavonoid and a carotenoid). While the flavonoid absorbed between 368-379 nm, the carotenoid would absorb around 455 nm. A temperature study also conducted allowed to set 140ºC as the desirable temperature to heat the samples without degrading them. FT-IR, conventional Raman and SERS allowed us to understand the existence of a reaction between the dyes and the clays (palygorskite and kaolinite), however it is difficult to understand it in a molecular point of view. As a second step, five species of Mexican dyes were selected on the basis of historical sources. The Maya yellow samples were produced adapting the recipe proposed by Reyes-Valerio, supporting the yellow dyes extracted from the dried plants on the clays, with addition of water, and then heated at 140ºC. It was found that the addition of water in palygorskite would increase the pH, hence deprotonating the molecules having a clear negative effect in the color. A second recipe was developed, without the addition of water; however, it was found that the use of water based binders would still alter the color of the samples with palygorskite. In this case, kaolinite without heating yield better results as a Maya yellow hybrid. It was found that the Maya chemistry might not have been the same for all the colors. The Mesoamericans might have found that different dyes could work better to their desires if matched with different clays. It was noticeable that for a clear distinction between flavonoids and carotenoids the reflectance and emission studies suffice, but when clay is added, Raman techniques will perform better. For this reason, conventional Raman and SERS were employed in order to create a database for the Mesoamerican dyestuffs for a future identification. |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | masterThesis |
| fulltext.url.fl_str_mv | https://run.unl.pt/bitstreams/7b57482f-e324-42b4-bb43-43d31a4fae9e/download |
| id | run_a26dd67eb3e79ac574a2b86a08be299d |
| identifier.url.fl_str_mv | http://hdl.handle.net/10362/13591 |
| inst_facet_str | urn:organizationAcronym:unl{{{_:::_}}}Universidade Nova de Lisboa |
| instacron_str | unl |
| institution | Universidade Nova de Lisboa |
| instname_str | Universidade Nova de Lisboa |
| language | eng |
| network_acronym_str | run |
| network_name_str | Repositório Institucional da UNL |
| oai_identifier_str | oai:run.unl.pt:10362/13591 |
| organization_str_mv | urn:organizationAcronym:unl |
| person_str_mv | Nabais, Paula Sofia Fonseca |
| publishDate | 2014 |
| repo_facet_str | urn:repositoryAcronym:run{{{_:::_}}}Repositório Institucional da UNL |
| reponame_str | Repositório Institucional da UNL |
| repository_id_str | urn:repositoryAcronym:run |
| service_str_mv | urn:repositoryAcronym:run |
| spelling | engporMesoamerican cultures had a strong tradition of written and pictorial manuscripts, called the codices. In studies already performed it was found the use of Maya Blue, made from a mixture of indigo and a clay called palygorskite, forming an incredibly stable material where the dye is trapped inside the nanotubes of the clay, after heating. However, a bigger challenge lies in the study of the yellows used, for these civilizations might have used this clay-dye mixture to produce their yellow colorants. As a first step, it was possible to provide identification, by non-invasive methods, of two colorants (a flavonoid and a carotenoid). While the flavonoid absorbed between 368-379 nm, the carotenoid would absorb around 455 nm. A temperature study also conducted allowed to set 140ºC as the desirable temperature to heat the samples without degrading them. FT-IR, conventional Raman and SERS allowed us to understand the existence of a reaction between the dyes and the clays (palygorskite and kaolinite), however it is difficult to understand it in a molecular point of view. As a second step, five species of Mexican dyes were selected on the basis of historical sources. The Maya yellow samples were produced adapting the recipe proposed by Reyes-Valerio, supporting the yellow dyes extracted from the dried plants on the clays, with addition of water, and then heated at 140ºC. It was found that the addition of water in palygorskite would increase the pH, hence deprotonating the molecules having a clear negative effect in the color. A second recipe was developed, without the addition of water; however, it was found that the use of water based binders would still alter the color of the samples with palygorskite. In this case, kaolinite without heating yield better results as a Maya yellow hybrid. It was found that the Maya chemistry might not have been the same for all the colors. The Mesoamericans might have found that different dyes could work better to their desires if matched with different clays. It was noticeable that for a clear distinction between flavonoids and carotenoids the reflectance and emission studies suffice, but when clay is added, Raman techniques will perform better. For this reason, conventional Raman and SERS were employed in order to create a database for the Mesoamerican dyestuffs for a future identification.application/pdfporSpectroscopic characterization of natural dyes by their non-invasive identification on pre-Columbian codices: the Maya yellowNabais, Paula Sofia FonsecaMiliani, CostanzaRomani, AldoHostingInstitutionOrganizationalRUNe-mailmailto:run@unl.ptrun@unl.pt2014-11-04T10:11:07Z2014-072014-112014-07-01T00:00:00ZHandlehttp://hdl.handle.net/10362/13591http://purl.org/coar/access_right/c_abf2open accessMaya blueMaya yellowDye-clay hybridsPre-Columbian codicesFlavonoidsCarotenoids4421043 bytesliteraturehttp://purl.org/coar/resource_type/c_bdccmaster thesishttp://purl.org/coar/access_right/c_abf2application/pdffulltexthttps://run.unl.pt/bitstreams/7b57482f-e324-42b4-bb43-43d31a4fae9e/download |
| spellingShingle | Spectroscopic characterization of natural dyes by their non-invasive identification on pre-Columbian codices: the Maya yellow Nabais, Paula Sofia Fonseca Maya blue Maya yellow Dye-clay hybrids Pre-Columbian codices Flavonoids Carotenoids |
| status | SINGLETON |
| subject.fl_str_mv | Maya blue Maya yellow Dye-clay hybrids Pre-Columbian codices Flavonoids Carotenoids |
| title | Spectroscopic characterization of natural dyes by their non-invasive identification on pre-Columbian codices: the Maya yellow |
| title_full | Spectroscopic characterization of natural dyes by their non-invasive identification on pre-Columbian codices: the Maya yellow |
| title_fullStr | Spectroscopic characterization of natural dyes by their non-invasive identification on pre-Columbian codices: the Maya yellow |
| title_full_unstemmed | Spectroscopic characterization of natural dyes by their non-invasive identification on pre-Columbian codices: the Maya yellow |
| title_short | Spectroscopic characterization of natural dyes by their non-invasive identification on pre-Columbian codices: the Maya yellow |
| title_sort | Spectroscopic characterization of natural dyes by their non-invasive identification on pre-Columbian codices: the Maya yellow |
| topic | Maya blue Maya yellow Dye-clay hybrids Pre-Columbian codices Flavonoids Carotenoids |
| topic_facet | Maya blue Maya yellow Dye-clay hybrids Pre-Columbian codices Flavonoids Carotenoids |
| url | http://hdl.handle.net/10362/13591 |
| visible | 1 |