%0 Journal Article %1 HJERDE1994 %A HJERDE, T. %A KRISTIANSEN, T. S. %A STOKKE, B. T. %A SMIDSROD, O. %A CHRISTENSEN, B. E. %C THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB %D 1994 %I ELSEVIER SCI LTD %J Carbohydr. Polym. %K ;; [ISI:] aqueous bacterial gellan gum helix; kappa-carrageenan; light-scattering; microbial order-disorder physicochemical polysaccharide; polysaccharides; properties; side-chains; sodium-chloride; transition; triple %N 4 %P 265 -- 275 %T CONFORMATION-DEPENDENT DEPOLYMERIZATION KINETICS OF POLYSACCHARIDES STUDIED BY VISCOSITY MEASUREMENTS %V 24 %X Degradation of single- and multiple-stranded polysaccharides by acid hydrolysis or free radical depolymerisation with H2O2/Fe2+ was monitored by viscosity measurements. Single-stranded polysaccharides (alginate, hydroxyethyl cellulose, carboxymethyl cellulose and kappa-carrageenan in its disordered conformation) gave the expected linear relationship between 1/eta(sp)((1/a)) and the degradation time, where a is the Mark-Houwink-Sakurada exponent. Double-stranded xanthan and triple-stranded scleroglucan showed a different pattern. Following an initial period with apparently slow degradation, a second regime was entered where the apparent degradation rate was much higher, and where eta(sp) followed the power law, eta(sp) similar to t(-vu). However, the estimated values of the parameter nu differed from those calculated by a Monte Carte method for double- (xanthan) and triple- (scleroglucan) stranded polymers. kappa-Carrageenan in its iodide-induced ordered conformation was very stable in acid as compared to the disordered conformation. In the ordered state the apparent degradation rate was initially constant, but increased in later stages. However, the double-logarithmic plot of eta(sp), versus time showed that there was neither a pronounced stable regime nor a regime following the power law. The degradation of gellan resulted in a rapid and linear increase in 1/eta(sp), With degradation time, both in the ordered and disordered conformation. The same type of degradation kinetics was obtained for welan.

@article{HJERDE1994, __markedentry = {[phpts:6]}, abstract = {Degradation of single- and multiple-stranded polysaccharides by acid hydrolysis or free radical depolymerisation with H2O2/Fe2+ was monitored by viscosity measurements. Single-stranded polysaccharides (alginate, hydroxyethyl cellulose, carboxymethyl cellulose and kappa-carrageenan in its disordered conformation) gave the expected linear relationship between 1/eta(sp)((1/a)) and the degradation time, where a is the Mark-Houwink-Sakurada exponent. Double-stranded xanthan and triple-stranded scleroglucan showed a different pattern. Following an initial period with apparently slow degradation, a second regime was entered where the apparent degradation rate was much higher, and where eta(sp) followed the power law, eta(sp) similar to t(-vu). However, the estimated values of the parameter nu differed from those calculated by a Monte Carte method for double- (xanthan) and triple- (scleroglucan) stranded polymers. kappa-Carrageenan in its iodide-induced ordered conformation was very stable in acid as compared to the disordered conformation. In the ordered state the apparent degradation rate was initially constant, but increased in later stages. However, the double-logarithmic plot of eta(sp), versus time showed that there was neither a pronounced stable regime nor a regime following the power law. The degradation of gellan resulted in a rapid and linear increase in 1/eta(sp), With degradation time, both in the ordered and disordered conformation. The same type of degradation kinetics was obtained for welan.}, added-at = {2011-11-04T13:47:04.000+0100}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB}, author = {HJERDE, T. and KRISTIANSEN, T. S. and STOKKE, B. T. and SMIDSROD, O. and CHRISTENSEN, B. E.}, authoraddress = {UNIV TRONDHEIM,DIV PHYS & MATH,N-7034 TRONDHEIM,NORWAY.}, biburl = {https://www.bibsonomy.org/bibtex/246b2abe5c97d70adc8ee8ede50ad482b/pawelsikorski}, citedref = {ANDERSON NS, 1969, J MOL BIOL, V45, P85 ; BAXENDALE JH, 1952, ADV CATAL, V4, P31 ; BROWN W, 1963, MAKROMOL CHEM, V64, P49 ; BROWN W, 1964, ARK KEMI, V22, P189 ; CAMPANA S, 1990, INT J BIOL MACROMOL, V12, P379 ; CAMPANA S, 1992, CARBOHYD RES, V231, P31 ; CHANDRASEKARAN R, 1988, CARBOHYD RES, V175, P1 ; CHAUVETEAU G, 1991, BASIC CONCEPTS ENHAN, P43 ; CHRISTENSEN BE, 1991, CARBOHYD RES, V214, P55 ; CHRISTENSEN BE, 1993, BIOPOLYMERS, V33, P151 ; CHRISTENSEN BE, 1993, MACROMOLECULES, V26, P6111 ; COVIELLO T, 1986, MACROMOLECULES, V19, P2826 ; CRESCENZI V, 1986, CARBOHYD RES, V149, P425 ; CRESCENZI V, 1987, CARBOHYD RES, V160, P283 ; CUSTER JJ, 1949, ANAL CHEM, V21, P1005 ; DAVISON P, 1982, SOC PET ENG J JUN, P353 ; DENTINI M, 1988, MACROMOLECULES, V21, P3312 ; DUBOIS M, 1956, ANAL CHEM, V28, P350 ; GRANT GT, 1973, FEBS LETT, V32, P195 ; GRASDALEN H, 1981, MACROMOLECULES, V14, P1842 ; HAUG A, 1963, ACTA CHEM SCAND, V17, P1466 ; HAUG A, 1964, THESIS NORWEGIAN I T ; HAUG A, 1967, ACTA CHEM SCAND, V21, P2859 ; HERP A, 1980, CARBOHYDRATES CHEM B, V1, P1276 ; HOLZWARTH G, 1976, BIOCHEMISTRY-US, V26, P271 ; HOLZWARTH G, 1985, DEV IND MICROBIOL, V26, P271 ; ITOU T, 1986, MACROMOLECULES, V19, P1234 ; KAWAKAMI K, 1991, CARBOHYD POLYM, V14, P189 ; KITAMURA S, 1989, BIOPOLYMERS, V28, P639 ; KOLTHOFF IM, 1962, INORG CHEM, V1, P189 ; LEE EJ, 1991, CARBOHYD RES, V214, P11 ; LIDE DR, 1990, HDB CHEM PHYSICS ; LIU W, 1987, CARBOHYD RES, V160, P267 ; LIU W, 1988, INT J BIOL MACROMOL, V10, P44 ; MILAS M, 1990, BIOPOLYMERS, V30, P451 ; MORRIS ER, 1977, J MOL BIOL, V110, P1 ; MORRIS ER, 1980, J MOL BIOL, V138, P349 ; MULLER G, 1988, CARBOHYD POLYM, V9, P213 ; NAKASUGA M, 1988, POLYM J, V20, P939 ; NERDAL W, 1993, J BIOMOL STRUCT DYN, V10, P785 ; NORISUYE T, 1980, J POLYM SCI POL PHYS, V18, P547 ; NORTON IT, 1984, J MOL BIOL, V175, P371 ; RICKARDS T, 1967, J POLYM SCI, V5, P931 ; RINAUDO M, 1980, INT J BIOL MACROMOL, V2, P45 ; RINAUDO M, 1982, CARBOHYD POLYM, V2, P135 ; SAITO H, 1977, CARBOHYD RES, V29, P1689 ; SAITO H, 1990, BIOPOLYMERS, V29, P1689 ; SATO T, 1984, MACROMOLECULES, V17, P2696 ; SERIGHT RS, 1986, 5TH S ENH OIL REC TU ; SMIDSROD O, 1963, ACTA CHEM SCAND, V17, P2628 ; SMIDSROD O, 1965, ACTA CHEM SCAND, V19, P143 ; SMIDSROD O, 1970, CARBOHYD RES, V13, P359 ; SMIDSROD O, 1974, FARADAY DISCUSS CHEM, V57, P279 ; SMIDSROD O, 1980, 27 INT C PUR APPL CH, P315 ; SMIDSROD O, 1980, CARBOHYD RES, V80, C11 ; SMIDSROD O, 1984, HYDROBIOLOGIA, V116, P178 ; SMIDSROD O, 1984, HYDROBIOLOGIA, V116, P19 ; STOKKE B, 1986, POLYM MATER SCI ENG, V55, P583 ; STOKKE BT, 1987, CARBOHYD RES, V160, P13 ; STOKKE BT, 1992, MACROMOLECULES, V25, P2209 ; STOKKE BT, 1993, 7TH EUR IOR S MOSC, P382 ; STOKKE BT, 1993, BIOPOLYMERS, V33, P561 ; TANFORD C, 1961, PHYSICAL CHEM MACROM, P611 ; THOMAS CA, 1956, J AM CHEM SOC, V78, P1861 ; THOMAS JK, 1965, T FARADAY SOC, V61, P702 ; TRUONG DN, 1987, 8715663, FR ; URBANI R, 1989, CARBOHYD POLYM, V11, P169 ; VREEMAN HJ, 1980, BIOPOLYMERS, V19, P1357 ; WEISS J, 1952, ADV CATAL, V4, P343 ; WELLINGTON SL, 1983, SOC PET ENG J DEC, P901 ; YANAKI T, 1981, POLYM J, V13, P1135 ; YANAKI T, 1983, BIOPHYS CHEM, V17, P337}, interhash = {af1fbf976a02271d3fde0bd86b9d30b7}, intrahash = {46b2abe5c97d70adc8ee8ede50ad482b}, isifile-dt = {Article}, isifile-ga = {PP117}, isifile-j9 = {CARBOHYD POLYM}, isifile-nr = {72}, isifile-pi = {OXFORD}, isifile-rp = {HJERDE, T, UNIV TRONDHEIM,DIV BIOTECHNOL,NORWEGIAN BIOPOLYMER ; LAB,N-7034 TRONDHEIM,NORWAY.}, isifile-sc = {Chemistry, Applied; Chemistry, Organic; Polymer Science}, isifile-tc = {24}, issn = {0144-8617}, journal = {Carbohydr. Polym.}, keywords = {;; [ISI:] aqueous bacterial gellan gum helix; kappa-carrageenan; light-scattering; microbial order-disorder physicochemical polysaccharide; polysaccharides; properties; side-chains; sodium-chloride; transition; triple}, language = {English}, number = 4, owner = {phpts}, pages = {265 -- 275}, publisher = {ELSEVIER SCI LTD}, size = {11 p.}, sourceid = {ISI:A1994PP11700003}, timestamp = {2011-11-04T13:47:12.000+0100}, title = {CONFORMATION-DEPENDENT DEPOLYMERIZATION KINETICS OF POLYSACCHARIDES STUDIED BY VISCOSITY MEASUREMENTS}, volume = 24, year = 1994 }