Results 261 to 270 of about 267,561 (310)

Carboxyl groups in Clostridium perfringens epsilon toxin

Microbial Pathogenesis, 1987
The maximal number of norleucine methyl ester (NME) incorporated into carboxyl groups in epsilon toxin of Clostridium perfringens by the carbodiimide-nucleophile procedure was 7 and 17 in the absence and presence of 8 M urea, respectively. The introduction of 3-4 nucleophilic modifying agents such as NME, glycine methyl ester or taurine into carboxyl ...
J, Sakurai, M, Nagahama
openaire   +2 more sources

Alginate esters via chemoselective carboxyl group modification

Carbohydrate Polymers, 2013
Alginates are (1→4) linked linear copolysaccharides composed of β-D-mannuronic acid (M) and its C-5 epimer, α-L-guluronic acid (G). Several strategies for synthesis of carboxyl modified alginate derivatives exist in the literature. Most of these however employ aqueous chemistries, such as carbodiimide coupling reactions.
Siddhesh N, Pawar, Kevin J, Edgar
openaire   +2 more sources

Functionally important carboxyl groups of horseradish peroxidase

Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology, 1984
The carboxyl groups of horseradish peroxidase (EC 1.11.1.7) were modified by the Koshland method using o-dianisidine as a nucleophilic agent (o-dianisidine, covalently bound to protein, has ϵ305 = 19.0 M−1·cm−1). At pH 5.0. only four COOH groups were accessible to modification.
G D, Kutuzova, V V, Rogozhin, N N, Ugarova, I V, Berezin   +3 more
openaire   +2 more sources

Free carboxyl groups in wood

Holz als Roh- und Werkstoff, 1990
Analyse des groupes carboxyle libres dans divers types de bois feuillus et resineux par echange de cations en vue de l'evaluation de leur ...
G. Staccioli, U. Tamburini
openaire   +1 more source

The terminal free carboxyl groups of pepsin

Biochimica et Biophysica Acta, 1954
Abstract The application of three methods to the determination of the terminal free carboxyl groups in pepsin has been described. It was determined that pepsin has two terminal free carboxyl groups, both of which are alanine.
M B, WILLIAMSON, J M, PASSMANN
openaire   +2 more sources

Carboxyl Groups in Wood Fibers. 1. Determination of Carboxyl Groups by Headspace Gas Chromatography

Industrial & Engineering Chemistry Research, 2003
The phase reaction conversion (PRC) headspace gas chromatographic (HSGC) technique was employed to develop a method for the determination of the content of carboxyl groups in wood fibers. Treatment of the wood fibers using hydrochloric acid was applied to convert carboxyl groups to carboxyl acids.
X.-S. Chai, Q. X. Hou, J. Y. Zhu, S.-L. Chen, S. F. Wang, L. Lucia   +5 more
openaire   +1 more source

Protection of Carboxyl Groups

1973
In synthesis it is often desirable to protect a carboxyl function in order to bring about specific reactions elsewhere in the molecule and subsequently to regenerate the original carboxyl group under conditions which do not affect other sensitive groups in the substrate.
openaire   +1 more source

Determination of Carboxyl Groups

1992
Carboxyl groups reportedly have been detected in native lignin, specifically in milled wood lignin, by infrared spectroscopy (Ekman and Lindberg 1960). However, the collective findings of a large number of structural studies indicate that if such groups are in fact present in native lignin, their concentration is extremely small.
openaire   +1 more source

Carboxylate Derivatives of Oligopyridines Bearing Bromomethyl Groups.

ChemInform, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Gilles Ulrich, Sébastien Bedel, Claude Picard, Pierre Tisnès   +3 more
openaire   +1 more source

Reactions of the carboxyl group

1996
As stated earlier (section 3.1) about 14% of the world production of oils and fats is used by the oleochemical industry and 90% of this is used for the production of soap and other surface-active compounds. This results from the fact that long-chain compounds based on fatty acids are amphiphilic in character.
openaire   +1 more source