%0 Journal Article %1 ANTHONSEN1993 %A ANTHONSEN, M. W. %A VARUM, K. M. %A SMIDSROD, O. %C THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB %D 1993 %I ELSEVIER SCI LTD %J Carbohydr. Polym. %K ;; [ISI:] chitins chitosans; deacetylated dna field intrinsic-viscosity; nmr-spectroscopy; polyelectrolytes; %N 3 %P 193 -- 201 %T SOLUTION PROPERTIES OF CHITOSANS - CONFORMATION AND CHAIN STIFFNESS OF CHITOSANS WITH DIFFERENT DEGREES OF N-ACETYLATION %V 22 %X Chitosans with degrees of N-acetylation, F(A), ranging from 0 to 0.6 were randomly degraded to different molecular weights and characterized by measuring intrinsic viscosities and osmotic pressure. In order to determine the stiffness parameter, B and the Mark-Houwink-Kuhn-Sakurada (MHKS) equations at different ionic strengths, intrinsic viscosities were measured at various ionic strengths. The Kuhn lengths at theta-conditions, A(mtheta), were estimated from an interpolation utilizing the obtained stiffness parameters and a published relation between B and A(mtheta) for different polyelectrolytes. These values were then used to compute the characteristic ratios, C(infinity), which are defined at theta-conditions. From the Flory-Fox viscosity relationship and a theory of Bloomfield and Zimm, the radii of gyration, R(G), and also the Kuhn lengths at different ionic strengths, A(mI). were calculated. In order to investigate the influence of the N-acetyl groups in contrast to the polyelectrolyte effect of the NH3+- group on the overall conformation, the intrinsic viscosity data were extrapolated to infinite ionic strength, and the resulting MHKS equations, the R(Ginfinity) and the A(minfinity) were estimated.

@article{ANTHONSEN1993, __markedentry = {[phpts:6]}, abstract = {Chitosans with degrees of N-acetylation, F(A), ranging from 0 to 0.6 were randomly degraded to different molecular weights and characterized by measuring intrinsic viscosities and osmotic pressure. In order to determine the stiffness parameter, B and the Mark-Houwink-Kuhn-Sakurada (MHKS) equations at different ionic strengths, intrinsic viscosities were measured at various ionic strengths. The Kuhn lengths at theta-conditions, A(mtheta), were estimated from an interpolation utilizing the obtained stiffness parameters and a published relation between B and A(mtheta) for different polyelectrolytes. These values were then used to compute the characteristic ratios, C(infinity), which are defined at theta-conditions. From the Flory-Fox viscosity relationship and a theory of Bloomfield and Zimm, the radii of gyration, R(G), and also the Kuhn lengths at different ionic strengths, A(mI). were calculated. In order to investigate the influence of the N-acetyl groups in contrast to the polyelectrolyte effect of the NH3+- group on the overall conformation, the intrinsic viscosity data were extrapolated to infinite ionic strength, and the resulting MHKS equations, the R(Ginfinity) and the A(minfinity) were estimated.}, added-at = {2011-11-04T13:47:04.000+0100}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB}, author = {ANTHONSEN, M. W. and VARUM, K. M. and SMIDSROD, O.}, authoraddress = {UNIV TRONDHEIM,N-7034 TRONDHEIM,NORWAY.}, biburl = {https://www.bibsonomy.org/bibtex/2c054fcb96212000cd777703d21d74587/pawelsikorski}, citedref = {ALLAN GG, 1989, CHITIN CHITOSAN, P443 ; BENOIT H, 1953, J PHYS CHEM-US, V57, P958 ; BLOOMFIELD V, 1966, J CHEM PHYS, V44, P315 ; BLOOMFIELD VA, 1974, PHYSICAL CHEM NUCLEI ; BOHDANECKY M, 1982, VISCOSITY POLYM SOLU ; BURCHARD W, 1968, SOLUTION PROPERTIES, V23, P135 ; DRAGET KI, 1992, BIOMATERIALS, V13, P635 ; FIXMAN M, 1964, J CHEM PHYS, V41, P3772 ; FLORY PJ, 1951, J AM CHEM SOC, V73, P1904 ; FLORY PJ, 1953, PRINCIPLES POLYM CHE ; FLORY PJ, 1969, STATISTICAL MECHANIC ; HARDING SE, 1991, ADV CARBOHYDRATE ANA, V1, P63 ; IMAI N, 1961, J PHYS SOC JPN, V16, P746 ; KAMIDE K, 1987, ADV POLYM SCI, V83, P1 ; KIENZLESTERZER C, 1984, CHITIN CHITOSAN RELA ; MANNING GS, 1969, J CHEM PHYS, V51, P924 ; MANNING GS, 1981, BIOPOLYMERS, V20, P1751 ; ODIJK T, 1977, J POLYM SCI POL PHYS, V15, P477 ; ODIJK T, 1978, J POLYM SCI POL PHYS, V16, P627 ; ODIJK T, 1979, BIOPOLYMERS, V18, P3111 ; PARK JW, 1983, B KOR CHEM SOC, V4, P68 ; POGODINA NV, 1986, POLYM SCI USSR, V28, P251 ; RINAUDO M, 1989, CHITIN CHITOSAN, P71 ; SANNAN T, 1976, MACROMOL CHEM, V177, P458 ; SKOLNICK J, 1977, MACROMOLECULES, V10, P944 ; SMIDSROD O, 1971, BIOPOLYMERS, V10, P1213 ; SMIDSROD O, 1991, SEAWEED RESOURCES EU, P185 ; STOKKE BT, 1992, CARBOHYD POLYM, V17, P209 ; TANFORD C, 1961, PHYSICAL CHEM MACROM ; TERBOJEVICH M, 1991, CARBOHYD RES, V209, P251 ; URBANI R, 1989, CARBOHYD POLYM, V11, P169 ; VARUM KM, 1991, CARBOHYD RES, V211, P17 ; VARUM KM, 1991, CARBOHYD RES, V217, P19 ; WANG W, 1991, INT J BIOL MACROMOL, V13, P281 ; WANG W, 1991, MAKROMOL CHEM-RAPID, V12, P559 ; YAMAKAWA H, 1974, MACROMOLECULES, V7, P128}, interhash = {98e9646883b06950737ca544acebbb86}, intrahash = {c054fcb96212000cd777703d21d74587}, isifile-dt = {Article}, isifile-ga = {MU970}, isifile-j9 = {CARBOHYD POLYM}, isifile-nr = {36}, isifile-pi = {OXFORD}, isifile-rp = {ANTHONSEN, MW, NORWEGIAN INST TECHNOL,DIV BIOTECHNOL,NORWEGIAN ; BIOPOLYMER LAB,N-7034 TRONDHEIM,NORWAY.}, isifile-sc = {Chemistry, Applied; Chemistry, Organic; Polymer Science}, isifile-tc = {105}, issn = {0144-8617}, journal = {Carbohydr. Polym.}, keywords = {;; [ISI:] chitins chitosans; deacetylated dna field intrinsic-viscosity; nmr-spectroscopy; polyelectrolytes;}, language = {English}, number = 3, owner = {phpts}, pages = {193 -- 201}, publisher = {ELSEVIER SCI LTD}, size = {9 p.}, sourceid = {ISI:A1993MU97000005}, timestamp = {2011-11-04T13:47:05.000+0100}, title = {SOLUTION PROPERTIES OF CHITOSANS - CONFORMATION AND CHAIN STIFFNESS OF CHITOSANS WITH DIFFERENT DEGREES OF N-ACETYLATION}, volume = 22, year = 1993 }