Molecular details of ovalbumin-pectin complexes at the air/water interface: A spectroscopic study

To stabilize air-water interfaces, as in foams, the adsorption of surface-active components is a prerequisite. An approach to controlling the surface activity of proteins is noncovalent complex formation with a polyelectrolyte in the bulk phase. The molecular properties of egg white ovalbumin in a complex with pectin in the bulk solution and at...

Hyphenation of infrared spectroscopy to liquid chromatography for qualitative and quantitative polymer analysis: Degradation of poly(bisphenol A)carbonate

Hyphenation of infrared spectroscopy (IR) to liquid chromatography (LC) has been applied to study chemical changes in poly(bisphenol A)carbonate (PC) as a result of degradation. Especially coupling of LC to FTIR through solvent elimination is a sensitive approach to identify changes in functionality observed in the LC chromatograms as has been...

Assessing the extent of protein intermolecular interactions at air-water interfaces using spectroscopic techniques

There is an ongoing debate about whether a protein surface film at an air-water interface can be regarded as a gelled layer. There is literature reporting that such films show macroscopic fracture behavior and a rheology comparable to three-dimensional protein bulk-networks. If this is the case, a complete description of the formation of...

Infrared tympanic temperature and ear canal morphology

Several publications indicate that the infrared tympanic temperature (IRTT) underestimates the core temperature of the body when the ear canal is long, curvy and narrow. In order to quantify these observations, a study was performed in 10 subjects. The IRTT was determined and compared to the oesophageal temperature (Tes), taken as the reference...

Correlation between mechanical behavior of protein films at the air/water interface and intrinsic stability of protein molecules

The relation between mechanical film properties of various adsorbed protein layers at the air/water interface and intrinsic stability of the corresponding proteins is discussed. Mechanical film properties were determined by surface deformation in shear and dilation. In shear, fracture stress, σf, and fracture strain, γf, were determined, as well...

Sign constraints improve the detection of differences between complex spectral data sets: LC-IR as an example

Spectroscopy is a fast and rich analytical tool. On many occasions, spectra are acquired of two or more sets of samples that differ only slightly. These data sets then need to be compared and analyzed, but sometimes it is difficult to find the differences. We present a simple and effective method that detects and extracts new spectral features...

Protein Adsorption at Air-Water Interfaces: A Combination of Details

Using a variety of spectroscopic techniques, a number of molecular functionalities have been studied in relation to the adsorption process of proteins to air-water interfaces. While ellipsometry and drop tensiometry are used to derive information on adsorbed amount and exerted surface pressure, external reflection circular dichroism, infrared,...

Structure and dynamics of egg white ovalbumin adsorbed at the air/water interface

The molecular properties of egg white ovalbumin adsorbed at the air/water interface were studied using infrared reflection absorption spectroscopy (IRRAS) and time-resolved fluorescence anisotropy (TRFA) techniques. Ovalbumin adsorbed at the air/ water interface adopts a characteristic partially unfolded conformation in which the content of the...

Spectrophotometric determination of ozone in air with indigo disulphonate

A simple, inexpensive and reliable manual spectrophotometric method for the determination of ozone in ambient air is evaluated. The air is passed through the blue solution of indigo disulphonate (IDS) in a special double sintered disc absorber. The resulting partly bleached solution is very stable. The discoloration is measured at 610 nm. The...

Mycotoxins

Chemicals/CAS: 3 nitropropionic acid, 504-88-1; aflatoxin B1, 1162-65-8; aflatoxin B2, 7220-81-7; aflatoxin G1, 1165-39-5; aflatoxin G2, 7241-98-7; aflatoxin, 1402-68-2; diacetoxyscirpenol, 2270-40-8; fumagillin, 23110-15-8; gliotoxin, 37273-88-4, 67-99-2; kojic acid, 501-30-4; luteoskyrin, 21884-44-6; ochratoxin, 303-47-9, 37203-43-3;...

Characterization of the components of technically polychlorinated biphenyl mixtures-II