The main chemical reactions [3, 4] through which N[H.sub.3] is produced are the direct conversion of urea into ammonia, through a thermolysis process, and the hydrolysis of isocyanic
acid (HNCO), which is an intermediate product of urea decomposition:
Spray parcels were trapped at SCR inlet face and allowed to vaporize and decompose through thermolysis thus generating ammonia and isocyanic
Thus, it appears that TMP, an acid species, can help push the cyanic acid form to isomerize to the isocyanic
acid form, as proposed in Equation 6.
Concerning captan metabolites, MS-MS spectra of the ion detected at m/z 150.0564, corresponding to the in-source fragmentation of sulfate and glucuronic conjugates of tetrahydrophtalimide (THPI), showed a loss of 43 u corresponding to neutral isocyanic
acid CONH, validating the identification of these metabolites.
Setser, "The fluorine atom + isocyanic
acid reaction system: a flow reactor source for isocyanate radical(~X2.PI.) and nitrogen monofluoride(X3.SIGMA.-)," The Journal of Physical Chemistry C, vol.
Carbamylation occurs in the covalent binding of isocyanic
acid to a-amino groups of free amino acids or N-terminus of proteins, and to e-amino groups of lysine residues (9).
15), which are different from the carbon monoxide, carbon dioxide, water, ammonia, and isocyanic
acid products previously reported using FTIR of thermally-degraded polymer (Moldoveanu et al.
In CKD, high blood urea concentrations result in increased protein carbamylation where isocyanic
acid is attached covalently to arginine or lysine residues.
Peptides meeting these criteria were then assessed for a 43 Da neutral loss assessing for the loss of isocyanic
acid (HNCO) through spectrometric analysis described by Hao et al.
This is an organic compound with the molecular formula [C.sub.2][H.sub.3]NO, arranged as [H.sub.3]C-N=C=O (synonyms: isocyanate methane, methyl carbylamine), and was discovered in 1888 as an ester of isocyanic
In this process, acrylicterminated PU is first synthesized by the reaction of HEA with isocyanic
(NCO)-terminated PU prepolymer (polycondensation of diisocyanate, dimethylolpropionic acid, hydroxyl-terminated polyether or polyester) and then the carboxyl group is neutralized with triethylamine.
However, there are several possible difficulties when seeking to accurately assess long-term glycaemic status according to the HbA1c level in severe CKD: (i) severe CKD is characterized by peripheral insulin resistance ; (ii) HbA1c can be carbamylated by isocyanic
acid (a reactive form of cyanate formed by the spontaneous dissociation of urea) ; and (iii) lifespan of erythrocytes is shortened by up to around one-third in haemodialysis patients , due to a combination of factors (vitamin deficiencies, iron deficiency, inflammation , the toxic uremic milieu , defective synthesis and secretion of erythropoietin , and hemolysis ).