Structural investigation on lubricating oil base stocks by 13C NMR spectroscopy.

Supramolecular interactions probed by 13C-13C solid-state NMR spectroscopy.

We present a robust solid-state NMR approach for the accurate determination of molecular interfaces in insoluble and noncrystalline protein-protein complexes. The method relies on the measurement of intermolecular (13)C-(13)C distances in mixtures of [1-(13)C]glucose- and [2-(13)C]glucose-labeled proteins. We have applied this method to Parkinson's disease-associated α-synuclein fibrils and fou...

Acute, subchronic, and developmental toxicological properties of lubricating oil base stocks.

Lubricating oil base stocks (LOBs) are substances used in the manufacture of finished lubricants and greases. They are produced from residue remaining after atmospheric distillation of crude oil that is subsequently fractionated by vacuum distillation and additional refining steps. Initial LOB streams that have been produced by vacuum distillation but not further refined may contain polycyclic ...

Investigation of a wide spectrum of inherited metabolic disorders by 13C NMR spectroscopy.

High-resolution (1)H NMR spectroscopy of body fluids has proved to be very useful in diagnostics of inherited metabolic diseases, whereas (13)C NMR remains almost unexploited. In this paper the application of (13)C NMR spectroscopy of fivefold concentrated urine samples for diagnosis of selected metabolic diseases is reported. Various marker metabolites were identified in test urine samples fro...

Investigation of the Hardening Reaction of Gelatin with 13C Labeled Formaldehyde by Solution and Solid State 13C NMR Spectroscopy

M odel reactions o f the hardening o f gelatin with 13C labeled form aldehyde were m onitored by 13C N M R spectroscopy in solution and in the solid state. In solution prim ary attack o f form aldehyde first forms methylols o f lysine residues and later o f arginine residues, which react to a lysine-arginine crosslink. D uring the drying process o f hardened gelatin, in addition to the lysine-a...

Causes of Floccules Formation in Hydro-Treated Lubricating Base Oil