%0 Journal Article %1 Berth1996b %A Berth, G. %A Dautzenberg, H. %A Christensen, B. E. %A Harding, S. E. %A Rother, G. %A Smidsrod, O. %C 1155 16TH ST, NW, WASHINGTON, DC 20036 %D 1996 %I AMER CHEMICAL SOC %J Macromolecules %K ;; [ISI:] chain change; conformation dilute-solution; polymers sodium-chloride; stiffness; %N 10 %P 3491 -- 3498 %T Static light scattering studies on xanthan in aqueous solutions %V 29 %X A commercial sample of xanthan was (i) sonicated and fractionated by GPC on Sepharose C1-2B with 0.1 M NaCl as eluant/solvent. The angular dependence of scattered light was measured (offline) and interpreted in terms of the wormlike chain model using the ''master curve procedure''. The persistence length was estimated as L(P) approximate to 150 nm. The mass per unit length M(L) approximate to 2000 g/mol . nm indicates double-stranded chains. (ii) The parent sample was studied at various ionic strengths I (0.01 mol/L less than or equal to I less than or equal to 0.3 mol/L). The conditions for optimum solubility and clarification (ultracentrifugation/membrane filtration) were checked. At higher ionic strength, the sample was only partly soluble and the solution contained supermolecular structures even after clarification. Good solubility was observed in 10 mM NaCl. The Zimm procedure was used to obtain the average molar mass M(W), the second virial coefficient, and the radius of gyration R(g). The interpretation of the scattering function led to M(W) = 2.88 x 10(6) g/mol, R(g) = 241 nm, L(P) = 149 nm, a polydispersity sigma(M) = 0.5, and double-stranded chains. At room temperature, solutions revealed a tendency for aggregation, which could be prevented by storage at elevated temperature.

@article{Berth1996b, __markedentry = {[phpts:6]}, abstract = {A commercial sample of xanthan was (i) sonicated and fractionated by GPC on Sepharose C1-2B with 0.1 M NaCl as eluant/solvent. The angular dependence of scattered light was measured (offline) and interpreted in terms of the wormlike chain model using the ''master curve procedure''. The persistence length was estimated as L(P) approximate to 150 nm. The mass per unit length M(L) approximate to 2000 g/mol . nm indicates double-stranded chains. (ii) The parent sample was studied at various ionic strengths I (0.01 mol/L less than or equal to I less than or equal to 0.3 mol/L). The conditions for optimum solubility and clarification (ultracentrifugation/membrane filtration) were checked. At higher ionic strength, the sample was only partly soluble and the solution contained supermolecular structures even after clarification. Good solubility was observed in 10 mM NaCl. The Zimm procedure was used to obtain the average molar mass M(W), the second virial coefficient, and the radius of gyration R(g). The interpretation of the scattering function led to M(W) = 2.88 x 10(6) g/mol, R(g) = 241 nm, L(P) = 149 nm, a polydispersity sigma(M) = 0.5, and double-stranded chains. At room temperature, solutions revealed a tendency for aggregation, which could be prevented by storage at elevated temperature.}, added-at = {2011-11-04T13:47:04.000+0100}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036}, author = {Berth, G. and Dautzenberg, H. and Christensen, B. E. and Harding, S. E. and Rother, G. and Smidsrod, O.}, authoraddress = {UNIV TRONDHEIM,DEPT BIOTECHNOL,NORWEGIAN BIOPOLYMER LAB,NOBIPOL,N-7034 TRONDHEIM,NORWAY. ; MAX PLANCK INST COLLOID & INTERFACE SCI,D-14513 TELTOW,GERMANY. ; UNIV NOTTINGHAM,DEPT APPL BIOCHEM & FOOD SCI,SUTTON LE12 5RD,ENGLAND.}, biburl = {https://www.bibsonomy.org/bibtex/2621603b24dd9fd9cd3e7623ff6562d38/pawelsikorski}, citedref = {BERTH G, IN PRESS BIOPOLYMERS ; BERTH G, 1994, CARBOHYD POLYM, V24, P197 ; BEZEMER L, 1993, MACROMOLECULES, V26, P6436 ; CHRISTENSEN BE, 1993, MACROMOLECULES, V26, P6111 ; COVIELLO T, 1986, MACROMOLECULES, V19, P2826 ; DAUTZENBERG H, 1988, J POLYM SCI POL LETT, V26, P353 ; DAUTZENBERG H, 1992, MAKROMOL CHEM-M SYMP, V16, P94 ; DAUTZENBERG H, 1994, J APPL POLYM SCI APP, V48, P351 ; DAUTZENBERG H, 1994, POLYELECTROLYTES FOR ; DENKINGER P, 1991, J POLYM SCI POL PHYS, V29, P589 ; DHAMI R, 1995, CARBOHYD POLYM, V27, P93 ; GAMINI A, 1994, BIOPOLYMERS, V34, P783 ; HACCHE LS, 1987, MACROMOLECULES, V20, P2179 ; HARDING SE, 1994, PROG COLL POL SCI S, V94, P54 ; HOLTZER AM, 1955, J POLYM SCI, V17, P432 ; HUGLIN MB, 1972, SCATTERING LIGHT POL ; JANSSON PE, 1975, CARBOHYD RES, V45, P275 ; KAWAKAMI K, 1991, CARBOHYD POLYM, V16, P341 ; KERKER M, 1969, SCATTERING LIGHT OTH ; KOYAMA R, 1973, J PHYS SOC JPN, V34, P1029 ; KRATOCHVIL P, 1972, LIGHT SCATTERING POL ; KULICKE WM, 1990, ERDOL KOHLE ERDGAS P, V43, P471 ; KULICKE WM, 1992, MAKROMOL CHEM-M SYMP, V61, P75 ; LEE S, 1993, TRENDS POLYM SCI, V1, P303 ; LIU W, 1987, CARBOHYD RES, V160, P267 ; LIU W, 1988, BIOPOLYMERS, V27, P1641 ; MULLER G, 1988, CARBOHYD POLYM, V9, P213 ; NORISUYE T, 1993, PROG POLYM SCI, V18, P543 ; PARADOSSI G, 1982, MACROMOLECULES, V15, P874 ; PFANNEMULLER B, 1971, BIOPOLYMERS, V10, P243 ; SATO T, 1984, MACROMOLECULES, V17, P1696 ; SATO T, 1984, POLYM J, V16, P341 ; SCHMIDT M, 1985, MAKROMOL CHEM-RAPID, V6, P767 ; STOKKE BT, 1991, ADV CARBOHYDRATE ANA, V1 ; ZHANG L, 1987, BIOPOLYMERS, V6, P333 ; ZIMM BH, 1948, J CHEM PHYS, V16, P1099}, interhash = {c836a597dba182eef6da9772a8ae9ea1}, intrahash = {621603b24dd9fd9cd3e7623ff6562d38}, isifile-dt = {Article}, isifile-ga = {UK468}, isifile-j9 = {MACROMOLECULES}, isifile-nr = {36}, isifile-pi = {WASHINGTON}, isifile-sc = {Polymer Science}, isifile-tc = {23}, issn = {0024-9297}, journal = {Macromolecules}, keywords = {;; [ISI:] chain change; conformation dilute-solution; polymers sodium-chloride; stiffness;}, language = {English}, month = {MAY 6}, number = 10, owner = {phpts}, pages = {3491 -- 3498}, publisher = {AMER CHEMICAL SOC}, size = {8 p.}, sourceid = {ISI:A1996UK46800025}, timestamp = {2011-11-04T13:47:06.000+0100}, title = {Static light scattering studies on xanthan in aqueous solutions}, volume = 29, year = 1996 }