Abstract SERS spectroscopy is successfully employed in this work to reveal different components integrating the cochineal colorant for dying archaeological textile samples from Arica Region North Chile. This analysis was done by in-situ experiments that does not imply material (colorant and biomolecules) extraction. The spectroscopic of textiles reveals presence bands attributed carminic acid n...

In this paper, I review the effects of diet ladybirds on chemical defence in group beetles. The tendency to reflex bleed and diversity autogenously produced alkaloids different taxa may be evolutionarily related likelihood food limitation. Within predatory species, both prey quantity quality have been shown affect autogenous alkaloid production. A few ladybird predators suggested adaptively seq...

A s Leona notes in a recent issue of PNAS (1), art and objects of cultural heritage hold information about the technology, trade, and aesthetics of a people. This knowledge can be accessed through chemical and material analysis combined with an understanding of the history of technology, science, and art. The information learned is of great value, especially for ancient objects that are so old ...

Abstract This work concerns the study of colors and dyes identified on archaeological textiles from Atacama Desert. The different garments ornaments come excavation two important pre-Columbian cemeteries Tarapacá region: Tarapacá-40 attributed to Formative period (1100 BC–660 AD) Pica-8 Late Intermediate (900–1450 AD). For first time, a multi-analytical approach with non-invasive techniques usi...

High-performance liquid chromatography coupled with spectrophotometric and electrospray mass spectrometric detection (HPLC-UV-Vis-ESI MS) was used for characterization of natural dyes present in historical art works. The gradient program was developed for identification of 29 colorants of various polarities. Dual detection system (UV-Vis and ESI MS) allowed differentiation of all compounds, eve...

We report the preparation of stable dispersion of multiwalled carbon nanotubes (MWCNTs) using carminic acid (CA) as a dispersing agent. The transmission electron microscopy (TEM), scanning electron microscopy (SEM), and atomic force microscopy (AFM) results confirmed that MWCNT is well dispersed in CA aqueous solution and CA has been well adsorbed at MWCNT walls. Fourier transform infrared (FTI...

Surface-enhanced Raman spectroscopy (SERS) was used in this work to obtain highly detailed spectra of artists’ red lake pigments and colorants. In the past, Raman spectroscopy has been successfully employed to identify many pigments and modern synthetic dyes. Unfortunately, red lake pigments and dyes commonly employed in artistic production from antiquity to the mid-nineteenth century are often...