Influence of the concentration of polyols on the rheological and spectral characteristics of guar gum

Abstract

Polyols are widely used as sugar substitutes and provide texture to foods. Guar gum has many applications in food industry such as increasing product viscosity and improving texture. Knowledge of rheological properties of gum/polyol systems is important to permit replacing sugar while maintaining product texture. In this work, rheological properties of 0.1, 0.5 and 1 g/100 g guar solutions containing 10 and 40 g/100 g of maltitol, sorbitol, or xylitol were studied. The behavior of these mixtures was evaluated by steady and oscillatory shear measurements, and after a freezing/thawing cycle. Apparent viscosity of guar solutions increased with addition of polyols and with the increase in their concentrations, except for 40 g/100 g sorbitol addition to 1 g/100 g guar gum, in which the apparent viscosity decreased. Addition of polyols also increased the dynamic moduli of the systems. In mixtures of guar with 40 g/100 g polyol, the phase angle (d) was below unity, but was dependent on frequency, which is characteristic of concentrated solutions with a certain degree of structuring. FTIR spectroscopy was studied to provide information on possible interactions between guar gum and polyols. Analyses carried out after freezing/ thawing showed no changes in the viscoelastic behavior of the solutions.

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Desenvolvimento De Geleia De Umbu-Cajá Convencional E Dietética

“…Entretanto, a ausência de açúcar em produtos processados altera a retenção de umidade e de outras características como sabor, textura, cor e aroma, tornando difícil o desenvolvimento de novos produtos similares aos convencionais. assim, ingredientes que dão corpo ao produto devem ser utilizados, visando a substituir o volume e a textura conferidos pelo açúcar (MoSER et al, 2013).…”

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“…Este efecto se presentó principalmente cuando se adicionó goma guar en su concentración pura y en sus mezclas, debido a que la goma guar es el espesante acuoso más eficiente que se conoce brindando soluciones clasificadas como pseudoplásticas (Moser et al, 2013).…”