نتایج جستجو برای: carminic acid

تعداد نتایج: 747443  

Journal: :Analytical chemistry 2009
Christa L Brosseau Alessa Gambardella Francesca Casadio Cecily M Grzywacz Jan Wouters Richard P Van Duyne

Tailored ad-hoc methods must be developed for successful identification of minute amounts of natural dyes on works of art using Surface-Enhanced Raman Spectroscopy (SERS). This article details two of these successful approaches using silver film over nanosphere (AgFON) substrates and silica gel coupled with citrate-reduced Ag colloids. The latter substrate functions as the test system for the c...

Journal: :Heritage 2023

The illuminated manuscripts at the Gulbenkian Museum were produced in 17th century, scriptoria of Armenian diaspora. In this work, we selected analytical methods that can be used situ to study colors illuminations. Scientific analysis based on fiber-optics reflectance spectroscopy visible and Raman has shown use a medieval palette inorganic pigments such as lapis lazuli, minium, vermilion, orpi...

Journal: :Journal of biomedical research & environmental sciences 2023

The far ultraviolet rays are harmful to human health, particularly for their mutagenic effects; it can cause skin cancer, cataracts, photochemical pollution. In the future, chemists plan use as weapons destruction of objects. Therefore, we should meet this future challenge by scientific means in order snuff out its far-ultraviolet rays. paper, we’ve intend carry a deep spectral study on series ...

2003
Anthony C. Dweck

This paper examines some of the existing methods for colouring the hair and skin using natural material (such as henna) and proposes a parallel technology that exists in the dyeing of wool and fabrics to extend the colour range. Many of the listed plants and their derivatives are not found in Annex IV of the Cosmetic Directive and may not be used as colours, however, they do have other properti...

2016
Shamayim T. Ramírez-Puebla Ernesto Ormeño-Orrillo Arturo Vera-Ponce de León Luis Lozano Alejandro Sanchez-Flores Mónica Rosenblueth Esperanza Martínez-Romero

Dactylopius species, known as cochineal insects, are the source of the carminic acid dye used worldwide. The presence of two Wolbachia strains in Dactylopius coccus from Mexico was revealed by PCR amplification of wsp and sequencing of 16S rRNA genes. A metagenome analysis recovered the genome sequences of Candidatus Wolbachia bourtzisii wDacA (supergroup A) and Candidatus Wolbachia pipientis w...

Journal: :Applied spectroscopy 2007
Alyson V Whitney Francesca Casadio Richard P Van Duyne

Silver film over nanospheres (AgFONs) were successfully employed as surface-enhanced Raman spectroscopy (SERS) substrates to characterize several artists' red dyes including: alizarin, purpurin, carminic acid, cochineal, and lac dye. Spectra were collected on sample volumes (1 x 10(-6) M or 15 ng/microL) similar to those that would be found in a museum setting and were found to be higher in res...

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