Dynamics of amylopectin in semidilute aqueous solution

Macromolecular Geometries Determined with Field-Flow Fractionation and their Impact on the Overlap Concentration

“…Ring et al 26 have reported that c* for waxy maize amylopectin is 9 kg/m 3 , a value that is very similar to what has been reported more recently by Yang et al also for waxy maize amylopectin. 32 On the other hand, Durrani and Donald also studied waxy maize amylopectin and obtained a value of 116 kg/m 3 (M ) 1 × 10 6 g/mol) and 173 kg/m 3 (M ) 2 × 10 6 g/mol). 31 Although the samples of Durrani and Donald probably had undergone some form of degradation, the value of c* is remarkably high.…”

Evaluation of amylopectin clusters and their interaction with nonionic surfactants

“…However, the branched structure of amylopectin gives unique characteristics to this biopolymer. For example, recently, amylopectin was chosen as model compound for the investigation of the diffusion behaviour in semidilute aqueous solution of branched polymers [16]. The Fig.…”

“…Sodium dodecyl sulfate and hexadecyltrimethylammonium bromide have been used as model compounds for obtaining a better understanding of the retrogradation of starch in the presence of lipids. The diffusion of molecules in the starch matrix has also been studied through laser light scattering experiments [16] and fluorescence recovery after photobleaching measurements [8].…”

Avaliação dos agregados ('clusters') da amilopectina em solução aquosa

“…Entretanto, a estrutura ramificada da amilopectina atribui características únicas a este polímero. Por exemplo, recentemente a amilopectina foi escolhida como composto modelo para investigações do comportamento de difusão em soluções semidiluídas de polímeros ramificados (YANG et al, 2006). Os resultados dispostos na FIGURA 16 sugerem que o procedimento de aquecimento para solubilização da amilopectina em solução promove a formação de vários clusters poliméricos.…”

“…3 Valor determinado por Fabiano de Almeida Silva no Laboratório de Catálise da Faculdade de Engenharia Química da UFU utilizando espalhamento estático de luz. Este valor esteve próximo ao estimado por Yang et al, (2006), 1,5 x 10 6 g/mol TABELA 9.…”