Physicochemical properties of carboxymethylated flamboyant ( Delonix regia ) seed gum Propiedades fisicoqu???-micas de la goma carboximetilada de flamboy????n ( Delonix regia )

摘要

The worldwide high consumption of food additives has encouraged to perform research on new species producers of gums or hydrocolloids that can compete with those that are traditionally used, such as flamboyant ( Delonix regia ) seed gum, a species considered underutilized and of ornamental type. Flamboyant tree seeds were used to obtain a native gum (flamboyant gum (FNG)), which was modified by carboxymethylation (CFG), this reaction was confirmed using Fourier transformed infrared (FTIR) spectroscopy and colorimetric titration. Swelling index and dispersion were evaluated in a range of 30?￠????90???????°C. The apparent viscosity (????) was evaluated with a rheometer. Compression strength of the gel (CSG) was measured with a texture analyzer and calorimetric profile with differential scanning calorimetry (DSC). The CFG had a degree of substitution of 0.33 and the FTIR analysis indicated the presence of carboxy-ether groups in the CFG. The modification of the FNG increased dispersion by 66%. Both gums exhibited shear-thinning behaviors although carboxymethylation caused a decrease in viscosity. The DSC showed a state crystalline in the FNG and a state amorphous in the CFG. The modification of the FNG favored hydrogen bridge interactions with water but decreased intra-catenary interactions in the polysaccharide. El alto consumo de aditivos alimentarios a nivel mundial incentiva la investigaci???3n de nuevas especies productoras de gomas o hidrocoloides que puedan competir con aqu????llas usadas tradicionalmente, tal es el caso de la goma de la semilla de flamboy????n ( Delonix regia ), especie subutilizada y considerada de tipo ornamental. Las semillas de flamboy????n fueron usadas para obtener goma nativa (FNG), la cual fue modificada por carboximetilaci???3n (CFG), esta reacci???3n se confirm???3 usando espectroscopia de infrarrojo con transformada de Fourier (FTIR) y titulaci???3n colorim????trica. El ???-ndice de hinchamiento y la dispersi???3n en agua fueron evaluados de 30????a 90???????°C. La viscosidad aparente (????) fue evaluada con re???3metro. La fuerza de compresi???3n del gel (CSG) fue medida con un analizador de textura y el perfil calorim????trico con un calor???-metro diferencial de barrido (DSC). La CFG tuvo un grado de sustituci???3n de 0,33. La modificaci???3n de la FNG increment???3 la solubilidad en un 66%. Ambas gomas tuvieron un comportamiento reofluidizante. La carboximetilaci???3n ocasiono un decremento de la ????. El DSC mostr???3 un estado cristalino en la FNG y amorfo en la CFG. La modificaci???3n de la FNG favoreci???3 las interacciones puentes de hidr???3geno con el agua pero disminuy???3 las interacciones intracatenarias en el polisac????rido.