Nonenzymatic browning reactions proceed with the starting reactants of sugar and/or protein during thermal processing and storage of food. In addition to food color formation, the process also contributes to the loss of essential nutrients, generation of beneficial antioxidants, and production of toxicants, including 5-hydroxymethylfurfural (5-HMF), reactive carbonyl species, advanced glycation...

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...

Carotenoids are bio-pigments naturally available in many prokaryotic and eukaryotic microorganisms which cannot be synthesized biologically by one self including animal but, required for our basic nutritional supplement. Different types of carotenoid pigments are available with different colors especially yellow, orange, red, and purple etc. includes approximately 700 different types (Cabral et...

Natural colorants have been widely used in food and cosmetic products. Nonionic and anionic surfactants are also usually added as solubilizers and stabilizers in the products. Surfactants form a special structure, a so-called micelle. Micelles can alter stabilities and physicochemical properties of other chemicals in the system. The objectives of this study were to determine stabilities in mice...

Conspicuous displays of color comprise an enormously diverse and functionally complex class of biological signals. Many of these displays are widely publicized as resulting from chemical colorants known as pigments, which act by selectively ‘‘absorbing’’ part of the light spectrum (Appendix 1). However, the full diversity of animal coloration is just as strongly influenced by optically active s...

Abstract Daylight fluorescent paints are luminous colors that increasingly used in contemporary art. The pigments consist of a synthetic resin which dyes and optical brighteners embedded. In the recent years, several research articles have been published on composition daylight pigments. Despite growing aging behavior paints, little is known to date about chemical processes involved aging. pres...

Traditional methods of image permanence testing have tracked changes in image appearance (changes in density, color balance, and/or Dmin stain) with densitometric endpoint criteria. Densitometric filter sets were optimized for specific colorant systems, for example, the Status A filter set to measure chromogenic photographic materials like those processed in RA-4 chemistry. Modern digital print...

To investigate the antibacterial functionality of natural colorant extracts, five kinds of natural dying aqueous solutions were obtained by extraction from peony, pomegranate, clove, Coptis chinensis and gallnut using water at 90 °C for 90 min with a liquor ratio (solid natural colorant material/water, weight ratio) of 1:10. The colorimetric assay and antibacterial activity of cotton, silk, and...

An algorithm is suggested for implementation of unlimited primaries in two-constants Kubelka-Munk color matching attempt. Allen's method for tristimulus color matching which was limited to four colorants in two constant theory, dealt with inversable matrices. By application of the pseudo-inverse, it is not necessary to limit the number of primary colors to four as Allen suggested. The suggested...