Infrared and Raman spectra of strontium and barium pimelates monohydrates.

The salts of dicarboxylic acids with alkaline earth metals are not very thoroughly studied and only a few such compounds are well known and characterized. In this work a detailed examination of the infrared spectra recorded at room temperature (RT) and at the liquid nitrogen boiling temperature (LNT) and Raman spectra (at room temperature) of the monohydrates of strontium and barium pimelates, [Sr(μ-CHO)(HO)]n and [Ba(μ-CHO)(HO)]n respectively, has been carried on. These isostructural salts are important nucleating agents for processing of isotactic polypropylene (iPP).

Vibrational spectra of MgKH(XO)·15HO (X=P, As) containing dimer units [H(XO)].

Infrared and Raman spectra of MgKH(PO)·15HO and MgKH(AsO)·15HO and a series of their partially deuterated analogues were recorded and analyzed. Compounds of the type MgKH(XO)·15HO (X=P, As) are little-known and a rare case of phosphate and arsenate salts containing dimer units [H(XO)] in the crystal structure. The analysis of their IR spectra (recorded at room and liquid nitrogen temperature) and Raman spectra showed that the spectral characteristics of the XO groups connected in a dimer through a proton are not consistent with the presence of X-O-H covalent linkage and C crystallographic symmetry of the XO groups.

Infrared and Raman Spectra of Magnesium Ammonium Phosphate Hexahydrate (Struvite) and its Isomorphous Analogues. VIII. Spectra of Protiated and Partially Deuterated Magnesium Rubidium Phosphate Hexahydrate and Magnesium Thallium Phosphate Hexahydrate.

The infrared and Raman spectra of magnesium rubidium phosphate hexahydrate MgRbPO4 • 6H2O and magnesium thallium phosphate hexahydrate, MgTlPO4 • 6H2O were recorded at room temperature (RT) and the boiling temperature of liquid nitrogen (LNT). To facilitate their analysis, also recorded were the spectra of partially deuterated analogues with varying content of deuterium. The effects of deuteration and those of lowering the temperature were the basis of the conclusions drawn regarding the origin of the observed bands which were assigned to vibrations which are predominantly localized in the water molecules (four crystallographically different types of such molecules exist in the structures) and those with PO43- character.

Determination of the composition of sialoliths composed of carbonate apatite and albumin using artificial neural networks.

The determination of the components of the sialoliths is important both from the point of view of chances for a successful medical treatment of the patients and because the prevention of further re-occurrence of sialolithiasis depends upon the knowledge of the nature of the constituents of the concrements. Despite the fact that infrared spectroscopy is widely used for the determination of the composition of sialoliths, urinary calculi and bladder stones, we found no data for any chemometric method developed for such purposes. Here, a method is presented for quantitative determination of the content of salivary calculi composed of albumin and carbonate apatite (one of the most often found constituents in the analyzed calculi from the patients from Macedonia) using artificial neural networks (ANN).

Infrared analysis of Macedonian mushroom dietary fibre.

The existing confusion in the terminology and composition of the mushroom dietary fibre literature data induced us to analyze simultaneously the chemical constitution of various dietary fibre isolates obtained from numerous mushroom samples. For that purpose, in 53 kinds of edible Macedonian mushrooms total dietary fibre was isolated by two parallel methods intended for material of plant and animal origin. With the aid of infrared spectroscopy the chemical constitution of the both isolated components was also investigated.