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Polyglucuronic acid

The origin and function of xylan in the cell wall are also not explained. Postulations that it is a plasticizer or is a reserve food are not fully substantiated. Its derivation from cellulose through the decarboxylation of an intermediary polyglucuronic acid seems very unlikely. There is evidence from a number of sources to indicate that the xylan polysaccharide is deposited along with cellulose in cell wall elaboration. [Pg.285]

V chidn, chitosan, polyglucuronic acid glucuronomanno-protein, polyphosphate Zygomycotina (Zygomycetes) Mucor, Phycomyces, Zygorhynchus... [Pg.109]

Polyacrylamidomethylpropane sulfonic acid Polyacrylic acid Polybutylene terephthalate Polydimethylaminoethyl methacrylate Polyester resin, thermoplastic Polyethylacrylate Polyethylene Polyethylene terephthalate Polyglucuronic acid Polyisobutene Polymethacrylamidopropyl trimonium chloride Polymethyl acrylate Polymethyl methacrylate Polyoxyisobutylene/methylene urea copolymer Polypropylene Polypropylene, oxidized Polyquaternium-1 Polyquaternium-2 Polyquaternium-4 Polyquaternium-5 Polyquaternium-6 Polyquaternium-7... [Pg.5250]

PEG-240 PEG-75 cocoa butter glycerides PEG-50 lanolin PEG-85 lanolin PEG-25M PEG-45M PEG-10 propylene glycol PEG-3 stearate PEG-8 stearate PEG-20 stearate Phytantriol Placental protein Polyamino sugar condensate Polydextrose Polyglucuronic acid... [Pg.5366]

Samples (2mg), i.e. 4-amino TEMPO, polyglucuronic acid-4-amino TEMPO and surfaced carboxylated cellulose nanocrystals-4-amino TEMPO, were dissolved in H2O (ImL) and loaded into a closed capillary tube (o.d. 0.7 mm) which was introduced in a standard EPR... [Pg.1008]

For totally oxidized polyglucuronic acid (from cellulose IIIi), a constant molar yield in the order of 100% is obtained. The conversion into cellulose IIIi involved starting material which is rapidly and fully oxidized yielding polyglucuronan whereas for native cellulose, around 10% of water-soluble product is obtained. The accessibility improve is due to the increase in distance between chains in the crystal (confirmed by the density variation from... [Pg.1023]

The solid-state NMR characteristics of surface carboxylated cellulose nanocrystals and liquid-state chemical shift data of polyglucuronic acid are given in Table 6 with the main appearance of the peak near 175 ppm and the FTIR peak at 1730 cm corresponding to carboxyl moiety. The FTIR characterization of these oxidized cellulose samples is shown in Table 7. [Pg.1023]

Table 6. The C NMR characteristics of polyglucuronic acid (liquid-state) and surface carboxylated cellulose nanocrystals (solid-state). Table 6. The C NMR characteristics of polyglucuronic acid (liquid-state) and surface carboxylated cellulose nanocrystals (solid-state).
Table 8. Degrees of conversion from polyglucuronic acid. Table 8. Degrees of conversion from polyglucuronic acid.
Figure 18. FTIR spectra of cellulose, polyglucuronlc acid, polyglucuronic acid-.n-butyl amine, polyglucuronic acid-2-methoxy ethyl amine and polyglucuronic acid-4-amino TEMPO. Figure 18. FTIR spectra of cellulose, polyglucuronlc acid, polyglucuronic acid-.n-butyl amine, polyglucuronic acid-2-methoxy ethyl amine and polyglucuronic acid-4-amino TEMPO.
Table 9. Chemical shift data of polyglucuronic acid with / butylamine and 2-methoxy ethyl amine. All the experimental data have been extrated from previous work [22]. Table 9. Chemical shift data of polyglucuronic acid with / butylamine and 2-methoxy ethyl amine. All the experimental data have been extrated from previous work [22].
Polyglucuronic acid with 73-butyl amine Polyglucuronic acid with 2-methoxy ethyl amine ... [Pg.1028]

The spectra of polyglucuronic acid grafted amines were analyzed and the different proton signals assigned by 2D-COSY (spectrum not presented) and 2D HMQC... [Pg.1029]

Figure 20. 2D C- H spectra in D2O a) HMQC of polyglucuronic acid 2-methoxy ethyl amine b) HMBC of polyglucuronic acid 2 methoxy ethyl amine. Ail the experimental data used have been extracted from previous work [22]. Figure 20. 2D C- H spectra in D2O a) HMQC of polyglucuronic acid 2-methoxy ethyl amine b) HMBC of polyglucuronic acid 2 methoxy ethyl amine. Ail the experimental data used have been extracted from previous work [22].
Figure 21. 2D HMBC spectrum in D2O of polyglucuronic acid-4-amino TEMPO. All the... Figure 21. 2D HMBC spectrum in D2O of polyglucuronic acid-4-amino TEMPO. All the...
Figure 22. Chemical structure of amines grafted polyglucuronic acid. Figure 22. Chemical structure of amines grafted polyglucuronic acid.
Based on these results and observations, the chemical structure of the grafted polyglucuronic acid can be established and reported in Figure 22. [Pg.1031]

From native cellulose, a partial conversion into surface carboxylated cellulose nanocrystals has been realized owing to its high aystaUinity and its poor accessibility of primary hydroxyl groups engaged in both intra and inter molecular hydrogen bonds in the native cellulose structure. The oxidation led to a two-phase solution water-soluble and water-insoluble fractions. These two fractions corresponded to the totally oxidized polyglucuronic acid and the surface carboxylated cellulose nanociystals, respectively. [Pg.1032]

Isogai, A. Kato, Y. (1998). Preparation of polyglucuronic acid from cellulose by TEMPO-mediated oxidation. Cellulose, 5, 153-164. [Pg.1244]

See other pages where Polyglucuronic acid is mentioned: [Pg.498]    [Pg.229]    [Pg.84]    [Pg.124]    [Pg.229]    [Pg.529]    [Pg.3510]    [Pg.292]    [Pg.304]    [Pg.306]    [Pg.355]    [Pg.1002]    [Pg.1005]    [Pg.1008]    [Pg.1021]    [Pg.1026]    [Pg.1026]    [Pg.1026]    [Pg.1028]    [Pg.1029]    [Pg.1029]    [Pg.1029]    [Pg.1033]    [Pg.1033]    [Pg.1037]   
See also in sourсe #XX -- [ Pg.229 ]

See also in sourсe #XX -- [ Pg.229 ]

See also in sourсe #XX -- [ Pg.23 , Pg.109 ]

See also in sourсe #XX -- [ Pg.109 ]



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