14 documents found, page 1 of 2

Yellow Fever and Sanitary Policies in the Nineteenth-Century Portuguese Empire:...

Yellow fever became a recurrent threat to public health acrossthe Atlantic during the nineteenth century, long before its aetiology and transmission were scientifically clarified through the work of Carlos Finlay and Walter Reed. Within the Portuguese imperial context, two outbreaks were particularly significant: Lisbon (1856–1858), which gave rise to the Relatório da Epidemia de Febre Amarella em Lisboa no an...

New Insights into pH-dependent Complex Formation between Lignosulfonates and An...

Anthocyanins have limited application as natural colorants and antioxidants due to their color loss and instability under certain conditions. This research explores the formation of a complex between lignosulfonates (LS) and cyanidin-3-O-glucoside (C3G) using a multitechnique approach as well as the effect on C3G ' s red color, oxidative stability, and antioxidant activity in acidic mediums. All data revealed p...

Exploring the Potential of Vine Shoots as a Source of Valuable Extracts and Sta...

Large amounts of vine shoots are generated every year during vine pruning. This residue still presents many of the compounds found in the original plant, including low molecular weight phenolic compounds and structural compounds such as cellulose, hemicellulose, and lignin. For wine-producing regions, the challenge is to develop alternatives that will increase the value of this residue. This work proposes the f...

Substance use and sexual behavior survey: a validation study

Pyranoflavylium Derivatives Extracted from Wine Grape as Photosensitizers in So...

Pyranoflavylium derivatives, namely cyanidin-3-glucoside, malvidin 3-O-glucoside, malvidin 3-O-coumaroylglucoside, cyanidin 3-glucoside-pyruvic acid adduct and malvidin 3-glucosidepyruvic acid adduct, extracted from red grapes were used as sensitizers in dye-sensitized solar cells (DSSCs). With these natural dyes, cell's efficiencies ranged up to 0.08%. The cyanidin based dyes were more efficient as sensitizers...

On the Contribution of Intramolecular Kinetics Properties of an Important Rotam...

The kinetics of an important rotamerization occurring in vinylpyranoanthocyanin-phenol pigment (Portisin) was analyzed according to the transition state (TS) formalism. The relevant stationary states, the TS and the equivalent minima, were fully characterized. This included the optimization of the respective geometries and the analytical calculation of all vibrational frequencies. The reaction coordinate was id...

Antioxidant properties of anthocyanidins, anthocyanidin-3-glucosides and respec...

The study of the antioxidants properties of three classes of pigments, namely anthocyanidins (cyanidin-Cy, delphinidin-Dp and malvidin-Mv), anthocyanidin-3-glucosides (Cy-3-gluc, Dp-3-gluc and Mv-3-gluc), and portisins (Cy-pt, Dp-pt and Mv-pt) was carried out. The aim was to evaluate the relationship between the structure antioxidant properties of individual anthocyanins and respective derivative pigments. The ...

Pyranoanthocyanin Dimers: A New Family of Turquoise Blue Anthocyanin-Derived Pi...

In the present work, several compounds bearing similar spectroscopic features were found to occur in aged Port wines and respective sediments (lees). The data obtained revealed two new families of compounds with unique spectroscopic characteristics, displaying a wavelength of the maximum absorption at high wavelength in the visible spectrum at similar to 730 and similar to 680 nm. The structure of these pigment...

Oxovitisins: A New Class of Neutral Pyranone-anthocyanin Derivatives in Red Wines

A new class of stable yellowish pigments with similar unique spectral features, displaying only a pronounced broad band around 370 nm in the UV-vis spectrum, was detected in an aged Port wine fraction obtained by a combination of chromatography on TSK Toyopearl HW-40(s) and Polyamide resins. These compounds were identified by liquid chromatography-diode array detector/electrospray ionization mass spectrometry (...

Influence of anthocyanins and derivative pigments from blueberry (Vaccinium myr...

The aim of the present study was to investigate the influence of an anthocyanin extract (extract I), and two other derivative extracts (extracts II and II), which are being developed aiming to be further applied in the food industry, on intestinal uptake of organic cations. For this purpose, the effect of these compounds on H-3-MPP+ uptake was evaluated in Caco-2 cells (an enterocyte-like cell line derived from...