Purpose. The purpose of this study was to demonstrate the utility of near-infrared (NIR) spectroscopy for the in vitro quantification of econazole nitrate (EN) and 4-cyanophenol (4-CP) in hairless guinea pig skin. Methods. NIR spectra were collected from each of the following: EN and 4-CP powders, EN and 4-CP in solution, and skin samples following topical exposure to either 4-CP in water or EN...

Multi-channel near-infrared spectroscopy (NIRS) offers the potential to substitute, or at least complement, electroencephalography (EEG) to detect functional activity e.g., in the motor area of the brain. Bedside NIR sensors have been used to investigate the haemodynamic shift caused by specific brain activity, such as epileptic seizures (Watanabe et al., 2000). Although it is clearly a promisi...

Hydrated sodium sulfates have been suggested to be present in variable amounts Solar System objects such as Mars and Europa, among the possible others. The presence of these hydrated species is related current/past aqueous environments, thus has an importance regarding potential habitability planetary objects. In this study, we analyzed anhydrous sulfate (thénardite) (mirabilite) by means visib...

Red wine grapes require a constant follow-up through analytical chemistry to assure the greatest quality. Wet chemical procedures are time-consuming and produce residues that hard eliminate. NIR (near infrared radiation) spectroscopy has been referred as an accurate, rapid, cost-efficient technique evaluate quality in many fruit species, both field industry. The main objective of this study was...

The sonication-driven dispersion of single-walled carbon nanotubes (SWCNTs) in aqueous surfactant solution has been monitored by UV-vis-NIR spectroscopy and scanning electron microscopy. Dispersion of SWCNTs experiments reveal that the maximum concentration of dispersed SWCNTs corresponds to the maximum UV-vis-NIR absorbance of the solution. With higher surfactant concentration the dispersion r...

This paper presents a novel classifier to identify standard and sub-standard milk powder, which is built by support vector machines (SVM) and near infrared spectroscopy (NIR). The training set is composed of 38 samples and the testing set is composed of 12samples. The correct classification ratio of the training set is up to 100%, while that of the testing set is up to 100%. The result indicate...

These glutathione (GSH)-conjugated CdTe/CdSe core/shell quantum dot (QD) nanoparticles in aqueous solution were synthesized using a microwave-assisted approach. The prepared type II core/shell QD nanoparticles were characterized by UV-Vis absorption, photoluminescence (PL) spectroscopy, X-ray powder diffraction (XRD) and high-resolution transmission electron microscopy (HR-TEM). Results reveale...

New, rapid, and inexpensive methods that monitor the chemical composition of corn stover and corn stover-derived samples are a key element to enabling the commercialization of processes that convert stover to fuels and chemicals. These new techniques combine near infrared (NIR) spectroscopy and projection to latent structures (PLS) multivariate analysis to allow the compositional analysis of hu...