- Crosslinking of Gelatin with Formaldehyde; a 13C NMR Study
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The different species formed when gaseous formaldehyde is dissolved in aqueous medium are investigated by a 13C NMR flow-through technique and the spectra of commercial aqueous formaldehyde solutions containing methanol completely interpreted. 13CH2O was used to study the crosslinking reaction with gelatin which leads to methylene and oxymethylene bridges between gelatin-amino-groups.On ageing, hardened gelatin shows an increase in the number of methylene bridges. - Keywords: Aqueous Formalin Solution Compositions, Gelatin Cross-Linking, Gelatin Hardening, Static and Continuous Flow, 13C NMR
- Albert, Klaus,Peters, Bernadette,Bayer, Ernst,Treiber, Ulrich,Zwilling, Michael
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p. 351 - 358
(2007/10/02)
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- Carbon-13 NMR Study of Reaction of Aqueous Formaldehyde with Amine Salts: Evidences for Reductive Methylation by Intramolecular Hydride Transfer
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Reductive methylation of amine salts by aqueous formaldehyde under acidic conditions proceeds through the initial formation of hydroxymethylamine intermediates, followed by intramolecular hydride transfer. 13C NMR studies on this reaction and the mechanism are discussed.
- Narasimhan, S.,Balakrishnan, M.,Kumar, A. S.,Venkatasubramanian, N.
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p. 568 - 570
(2007/10/02)
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