Dynamic light scattering investigation of sodium caseinate and xanthan mixtures

Nash, William; Pinder, D. N.; Hémar, Yacine; Singh, Harjinder

doi:10.1016/s0141-8130(02)00041-7

Cited by 39 publications

(26 citation statements)

References 12 publications

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“…59 However, for sodium caseinate-xanthan systems it has been reported that the mixtures corresponded to the superposition of the modes of the pure biopolymers, suggesting the absence of interactions between the components in the concentration range studied. 60 In this study, the sodium alginate/pectin system showed an increase in R H after stirring the solutions for 24 h at 25 °C and 80 °C, in either NaCl or KCl. A similar effect has been observed by Hiorth et al 12 for chitosan and high pectin content solutions.…”

Section: Dynamic Light Scattering Of Ternary Pectin and Alginate Mixtmentioning

confidence: 58%

Dynamic light scattering and viscosimetry of aqueous solutions of pectin, sodium alginate and their mixtures: effects of added salt, concentration, counterions, temperature and chelating agent

Lima¹,

Soldi²

2009

J. Braz. Chem. Soc.

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Efeitos de adição de sal, concentração, presença de contraíons, temperatura e agente quelante em soluções aquosas de pectina, alginato de sódio e misturas destes foram analisadas por viscosimetria e espalhamento de luz dinâmico (DLS). A viscosidade intrínseca dos sistemas binários diminuiu com a adição de sal e com o aumento da temperatura, porém, mostrou-se insensível à adição de NaEDTA. Como esperado, a viscosidade intrínseca do sistema ternário alginato/pectina/água foi igual a média da viscosidade intrínseca determinada para os sistemas binários. Estudos de DLS indicaram a ocorrência de uma distribuição bimodal (presença dos modos de relaxação rápido e lento) para ambos os sistemas binários e ternários a 25 °C, refletindo um processo de agregação. No caso do modo lento de relaxação, um aumento significativo do raio hidrodinâmico foi observado tanto para os sistemas binários como ternário, na presença de NaCl e KCl a 25 °C. No entanto, a 80 °C, o raio hidrodinâmico correspondente ao modo lento em soluções de KCl foi praticamente constante para todos os sistemas estudados e não foi observado para o sistema binário alginato/solução aquosa.The effects of added salt, concentration, counterions, temperature and chelating agent on aqueous solutions of pectin, sodium alginate and their mixtures were analyzed by viscosimetry and dynamic light scattering (DLS) techniques. The intrinsic viscosity of the binary systems decreased with the addition of salt and with temperature, while it was found to be insensitive to the addition of NaEDTA. As expected the intrinsic viscosity of the ternary alginate/pectin/water system was equal to the average of the intrinsic viscosity for the binary systems. The DLS studies indicated a bimodal distribution (fast and slow relaxation modes) for both binary and ternary systems at 25 °C, reflecting aggregation. A significant increase in the hydrodynamic radius, in the case of the slow mode, was observed for the binary and ternary systems in the presence of NaCl and KCl at 25 °C. However, at 80 °C the hydrodynamic radius for the slow mode in KCl solutions was practically constant for all the studied systems, except for the alginate binary solutions in which were not observed.

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Section: Dynamic Light Scattering Of Ternary Pectin and Alginate Mixtmentioning

confidence: 58%

Dynamic light scattering and viscosimetry of aqueous solutions of pectin, sodium alginate and their mixtures: effects of added salt, concentration, counterions, temperature and chelating agent

Lima¹,

Soldi²

2009

J. Braz. Chem. Soc.

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show abstract

“…Alternatively, it cannot be overruled that these particles are made of milk protein; particularly NaCAS particles are known to self associate through hydrophobic interactions. However, the NaCAS aggregates have been reported to be smaller than 100 nm (Chu, Zhou, Wu, & Farrell, 1995;Nash, Pinder, Hemar, & Singh, 2002) while the aggregates seen in Fig. 7A2 and B2 are in the m range.…”

Section: Confocal Microscopy Of Protein/rice Starch Granule Mixturesmentioning

confidence: 90%

Adsorption of milk proteins onto rice starch granules

Noisuwan

Hémar

Wilkinson

et al. 2011

Carbohydrate Polymers

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“…Sodium caseinate has been characterised in aqueous solution using static and dynamic light scattering by a number a research groups [2][3][4][5][6][7][8]. Caseinate is present as individual molecules at low ionic strength (3 mM), but forms small aggregates with a z-average hydrodynamic radius (R hz ) of about 11 nm at neutral pH, room temperature and high ionic strength (>100 mM) [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Sodium caseinate solutions also contain a small weight fraction of larger particles with a radius of about 80 nm [2,6,8,9]. The nature of the larger particles is, as yet, unknown, but it is clear that they are not residual native casein since, contrary to the latter, they do not sediment during ultracentrifugation.…”

Section: Introductionmentioning

confidence: 99%