Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 16, Pages 8134-8145Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am402193u
Keywords
Maya Blue; dehydroindigo; indigo; isatin; palygorskite; sepiolite; silicalite; kaolinite; montmorillonite
Funding
- MICINN [CTQ2011-28079-CO3-01, CTQ2011-28079-CO3-02]
- ERDF
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Maya Blue-type specimens prepared from indigo (1 wt %) plus kaolinite, montmorillonite, palygorskite, sepiolite, and silicalite are studied. Liquid chromatography with diode array detection, ultra-performance liquid chromatography coupled with mass spectrometry, and pyrolysis-silylation gas chromatography-mass spectrometry analyses of the extracts from these specimens combined with spectral and solid-state voltammetry, electrochemical impedance spectroscopy, and scanning electrochemical microscopy techniques provide evidence for the presence of a significant amount of dehydroindigo and isatin accompanying indigo and other minority organic compounds in all samples. Solid-state electrochemistry data permits the estimatation of indigo loading in archeological Maya Blue, which is in the range of 0.2 to 1.5 wt %. These results support a view of 'genuine' Maya Blue-type materials as complex polyfunctional organic-inorganic hybrids.
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