Adsorption of Gum on Self-Assembled Monolayer Surfaces: A Comprehensive Study Using QCM-D and MP-SPR.

The interfacial structuring of gum at various pH values on self-assembled monolayer (SAM) surfaces was investigated in order to evaluate the respective importance of surface versus biopolymer hydration in the adsorption process of the gum. To this end, SAMs with four different ending chemical functionalities (-CH, -OH, -COOH, and -NH) were used on gold surfaces, and the gum adsorption was monitored using multiparametric surface plasmon resonance (MP-SPR) and quartz crystal microbalance with dissipation. Surface modification with alkanethiol and the subsequent adsorption of gum were also characterized by contact angle measurements using both sessile drop and captive bubble methods.

ATR Spectroscopy Study of the Interaction of Gum with Gold Nanoparticles Films at the Solid-Liquid Interface.

The adsorption process of gum (), a complex heteropolysaccharide, was followed by using a spectroscopic method to unravel the relative contribution of the protein moieties and the carbohydrate blocks on the adsorption process. ATR-FTIR was used to investigate the kinetics and conformational changes associated with the adsorption of gum on gold nanoparticle films (Au-NPs) at different pHs. The results of this thorough study highlighted the adsorption of gum through its protein moieties, in particular, AGPs of low molecular weight and high protein content, close to the Au-NPs surface.

Tungstate (VI) sorption on hematite: An in situ ATR-FTIR probe on the mechanism.

Owing to the suspected toxicity and carcinogenicity of tungstate (VI) oxyanions [i.e. mono tungstate and several polytungstate, generally represented by W (VI)], the environmental fate of W (VI) has been widely studied.

Towards a semiquantitative non invasive characterisation of Tyrian purple dye composition: Convergence of UV-Visible reflectance spectroscopy and fast-high temperature-high performance liquid chromatography with photodiode array detection.

In this paper, partial least square (PLS) regression is innovatively applied for a semi-quantitative non invasive study of the most precious dye of Antiquity: Tyrian purple. This original approach for the study of organic dyes in the cultural heritage field, is based on the correlation of spectrophotometric (UV-Visible) and chromatographic (Fast-HT-HPLC-PDA) data from an extensive set of textiles prepared with different snail species according to historical recipes. A cross-validated PLS model, based on the quantity of 6,6'-dibromoindigotin, displays an excellent correlation factor (R(2)Y = 0.