Faalangst en perfectionisme

Isolation and comparative characterization of a Björkman lignin from the saponified cork of Douglas-fir bark

“…It was preferred to other pyrolysis-based methods, namely pyrolysis with in situ methylation using tetramethylammonium hydroxyde (TMAH) that has been introduced as an improvement for the analysis of biopolymers [36] including lignins [37,38], cork suberin [39,40] and grapefruit suberin [41], but still is in study and improvement [42][43][44][45]. TMAH/Py is a thermochemolysis procedure mixing hydrolytic, methylating and pyrolytic reactions [36,[46][47][48], where the strong alkaline character of TMAH causes dominant chemolytic reactions at the used temperatures which favors hydrolysis of labile bonds, as esters, in less extent ethers, and with high difficulty the C-C bonds.…”

Direct chemolysis–gas chromatography–mass spectrometry for analysis of paint materials

“…The results show that TFTMAH and PhTMAH can be used effectively at temperatures much lower than those required and commonly used for the TMAH reagent. At the optimum temperature for TMAH, side reactions, including non-specific pyrolytic decomposition of the sample, are more likely to occur [18,24].…”

“…The unwanted reactivity of the acids was shown to be higher in methanolic systems and less concentrated aqueous solutions. It is believed [24] that differences in the co-ordination chemistry of the TMAH and the reactant leads to different acidities of the ahydrogen, hence the formation of the unwanted by-products.…”

“…Van den Berg et al [24] advised the use of an aqueous solution of TMAH reagent (approx. 2.5% solution).…”