Results 171 to 180 of about 25,044 (226)

Tin(iv) catalyzed d-galacturonic acid anomerization

Dalton Trans., 2008
A comparative kinetic study of anomerization between the four main forms (alpha/beta-pyranosides and alpha/beta-furanosides) of D-galacturonic acid (GalAH(2), 1) and tin(IV) complexed D-galacturonate ([Sn(CH(3))(2)(GalA)(H(2)O)(2)], 2) in D(2)O, is reported. Important differences are shown by pD vs. mutarotation rate profiles of 1 and 2.
ROTONDO, Archimede, ROTONDO, Enrico, CASELLA G. A., GRASSO G.   +3 more
openaire   +4 more sources

Methyl-α-D-galacturonic acid methyl ester

Acta Crystallographica Section C Crystal Structure Communications, 1994
The structure of methyl methyl-α-D-galacturonoate monohydrate, C 8 H 14 O 7 .H 2 O, has been redetermined. The sugar ring has the expected 4 C 1 conformation. The orientation of the methoxy group is gauche-trans and the methyl ester group is nearly planar and lies equatorial to the ...
LAMBA D, FABRIZI, Giancarlo, MATSUHIRO B.   +2 more
openaire   +2 more sources

Nonesterified galacturonic acid sequence homology of pectins

Biopolymers, 2000
The methyl ester distribution of pectins was studied with a recently developed enzymatic method. Endopolygalacturonase of Kluyveromyces fragilis was used to degrade pectin and the composition of the degradation products was determined with high-performance anion-exchange chromatography at pH 5.
Daas, P.J.H., Boxma, B., Hopman, A.M.C.P., Voragen, A.G.J., Schols, H.A.   +4 more
openaire   +3 more sources

Galacturonic acid groups in birch xylan

Wood Science and Technology, 1977
A large number of reducing xylose end groups are present in birch wood (Betula verrucosa) while all galacturonic acid moieties are non-reducing. A large portion of the reducing xylose end groups are removed during treatments with alkali used for the islation of xylan, while reducing galacturonic acid moieties are formed by endwise degradation during ...
Thomas Ericsson, G�ran Petersson, Olof Samuelson   +2 more
openaire   +1 more source

ChemInform Abstract: D‐Galacturonic Acid Derivatives. Part 6. D‐Galacturonic Acid Derivatives with Liquid Crystalline Properties.

ChemInform, 1993
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
C. VOGEL, U. JESCHKE, V. VILL, H. FISCHER   +3 more
openaire   +1 more source

Poly(galacturonic acid)–bivalent metal complexes

Journal of Polymer Science Part A-1: Polymer Chemistry, 1972
AbstractComplexation or stability constants have been determined for complexes of poly‐(galacturonic acid) with Cu, Cd, Zn, and Ni. The stability of complexation decreases as follows: Cu > Cd > Zn > Ni.
H. H. G. Jellinek, Pi‐Yao A. Chen
openaire   +1 more source

Hydrothermal Production of Mono(galacturonic acid) and the Oligomers from Poly(galacturonic acid) with Water under Pressures

Industrial & Engineering Chemistry Research, 2004
A monosaccharide of galacturonic acid and its oligomers were produced by hydrolysis of poly-(galacturonic acid)s with water in the absence of any additives in a semibatch flow reactor over the temperature range from 453 to 533 K at 10 MPa. A solid sample of poly(galacturonic acid) was fixed in the reactor, and the residence times of water in the ...
Tetsuya Miyazawa, Toshitaka Funazukuri
openaire   +1 more source

The d-galacturonic acid catabolic pathway in Botrytis cinerea

Fungal Genetics and Biology, 2011
D-galacturonic acid is the most abundant component of pectin, one of the major polysaccharide constituents of plant cell walls. Galacturonic acid potentially is an important carbon source for microorganisms living on (decaying) plant material. A catabolic pathway was proposed in filamentous fungi, comprising three enzymatic steps, involving D ...
Zhang, L., Thiewes, H., van Kan, J.A.L.
openaire   +2 more sources

Free Galacturonic Acid in Citrus Fruits

Botanical Gazette, 1958
1. Very little free galacturonic acid was found at any time during the normal maturation of tree-ripened Valencia oranges. An ion-exchange procedure was used to collect the organic acids, and the presence of monogalacturonic acid in the eluate was determined with a carbazole colorimetric method and a chromatographic analysis procedure.
Walton B. Sinclair, Virgil A. Jolliffe
openaire   +1 more source