title: Characterisation of commercial LM-pectin in aqueous solution.
abstract: Fourteen commercial LM-pectin samples were investigated in this study. The degree of esterification (DE) varied from 9.6% to 42.0% and the degree of amidation (DA) from 0% to 25%. Chemical and structural characteristics were examined using atomic absorption (AA), dilute solution capillary viscometry, GPC-MALLS and dynamic light scattering. The intrinsic calcium was in the range of 47-1388 ppm, the intrinsic viscosity varied from 2.9 to 4.9 (dL/g) and the weight average molecular weight (M(w)) from 113 to 290 (kDa). Most of the samples had Huggins constants of ~0.5. However, for samples having acidic pH, Huggins constant values greater than 1, which can be as an indication of aggregation, were obtained. The high Huggins constant value could be reduced to ~0.5 by the addition of 3M urea, indicating that the aggregation was stabilised by hydrogen bonding. Shear flow viscosity revealed three types of rheological behaviour. Type A showed pronounced shear thinning behaviour, which was reduced by the addition of hydrogen bonding breaking agent urea. Type B with intrinsic Ca of 1mM and pH ~4 showed two shear thinning regions, with significantly enhanced shear viscosity upon addition of calcium. Type C showed the least aggregation due to its pH ~4 and low intrinsic Ca, but could be converted to type B upon addition of Ca. The effect of Ca on the rheological behaviour of types B and C was further confirmed by CaCl(2) and Ca-chelating agent (EDTA). Temperature affected the molecular conformation of all types and most significantly type A by eliminating the hydrogen bonding.
authors: Glyn O Phillips Hydrocolloids Research Centre, Glyndwr University, Wrexham LL11 2AW, UK.
authors: Xiangyang
authors: X
authors: Li
authors: Saphwan
authors: S
authors: Al-Assaf
authors: Yapeng
authors: Y
authors: Fang
authors: Glyn O
authors: GO
authors: Phillips
mesh_terms: D002122:Calcium Chloride / Q000737:chemistry; D004492:Edetic Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D010368:Pectins / Q000737:chemistry*; D012212:Rheology; D012996:Solutions; D013696:Temperature; D014508:Urea / Q000737:chemistry; D014783:Viscosity; D014867:Water / Q000737:chemistry*
chemical_list: D012996:Solutions; D014867:Water; D010368:Pectins; D014508:Urea; D004492:Edetic Acid; D002122:Calcium Chloride