Fast determination of diesel fuel oxidation stability by 1H NMR spectroscopy.

(1)H NMR spectroscopy and multiple linear regression analysis were used to determine diesel fuel oxidation stability. Oxidation stability is one of the most important properties which affect diesel fuel characteristics and quality. It has been demonstrated that integrated peak intensities of certain functional groups in (1)H NMR spectra correlated well with the oxidation stability.

Characterization of Azerbaijani and Croatian brown naphthalane.

In spite of the fact that noncolored (nonaromatic) naphthalane containing high sterane content has been proved as bioactive and efficient in the treatment of psoriasis vulgaris, brown naphthalanes, which contain aromatics, are still in use. Thousands of patients, who have been passing through the therapy, deserve thorough and permanent study of brown naphthalanes. For that reason, two frequently used brown naphthalane preparations, one of the Azerbaijani (N1) and the other of the Croatian (N2) origin, were studied.