Identification of selected seaweed polysaccharides (phycocolloids) by vibrational spectroscopy (FTIR-ATR and FT-Raman). Abstract The wide industrial application of phycocolloids (e.g. alginates, agar and carrageenans) is based on their particular properties to form gels in aqueous solution. These seaweed polysaccharides present a chemical structure related with the taxonomic position of the algae: carrageenans are produced by…
Insights into phase stability of anhydrous-hydrate systems: a Raman-based methodology. Abstract FT-Raman spectroscopy turns out to be a powerful technique to evaluate the amount of polymorphic and pseudopolymorphic forms in crystalline samples – which is particularly relevant in pharmaceutical sciences. This paper presents a methodology that allows successful quantitative evaluation of the solid-state hydration and…
The solid-liquid phase diagrams of binary mixtures of consecutive, even saturated fatty acids. Abstract For the first time, the solid–liquid phase diagrams of five binary mixtures of saturated fatty acids are here presented. These mixtures are formed of caprylic acid (C8:0) + capric acid (C10:0), capric acid (C10:0) + lauric acid (C12:0), lauric acid (C12:0)…
Surface-Enhanced Raman Scattering of 5-Fluorouracil adsorbed on silver nanostructures. Abstract Raman and surface-enhanced Raman scattering (SERS) of 5-fluorouracil (5-FU) have been recorded under several experimental conditions. SERS spectra have been analysed according to a resonant charge-transfer (CT) mechanism similar to a resonance Raman (RR) process, involving the photoinduced transfer of an electron from the Fermi…
Inclusion Compounds of Phenol Derivatives with Cyclodextrins: a combined spectroscopic and thermal analysis. Abstract Inclusion compounds involving α-, β- and γ-cyclodextrins (α-, β- and γCD) and phenol derivatives, namely 3-methoxyphenol (3MeOPh), 2-methoxyphenol (2MeOPh) and 3-methylphenol (3MePh), were investigated and characterized by combining Raman spectroscopy, ab initio calculations, DSC and TG analysis. The effects of the…
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