Synergistic interactions in dilute aqueous solutions between alginate and tropical vegetal hydrocolloids

Abstract

Encapsulation in alginate beads has always been limited by the leakage due to the too wide distribution of pore sizes. Mixing alginate with other polymers have sometimes reduced the problem. Hydrocolloids from seven tropical vegetal species (barks of Triumfetta cordifolia and Bridelia thermifolia, seeds of Irvingia gabonensis and Beilschmiedia obscura , and leaves of Ceratotheca sesamoides, Adansonia digitata and Corchorus olitorius ) were screened for synergistic interactions with alginate in dilute aqueous solution. Mixtures with alginate were made at different volume proportions and deviations from the initial viscosity set at 1 were evaluated. In distilled water, the gums from T. cordifolia, B. obscura, C. sesamoides and C. olitorius presented synergies with alginate. In 2 mM calcium chloride, the seven gums showed positive synergy. Interactions are favored by gum flexibility and the presence of charges, although high charges reduced the interactions. Alginate fraction of maximum viscosity enhancement depends on the ability to conformational order of the gum. The measure by laser diffraction of alginate-gum particles sizes at different fractions showed that the cooperative interactions did not always involve the largest complexes formed in gums associations. The occurrence of these interactions predicts the formation of homogeneous mixed gels at higher polymer and calcium concentrations.

Optimisation of Encapsulation by Complex Coacervation of Phenolic Compounds from Propolis with Triumfetta cordifolia Gum and Kinetic Study

“…The gelatin and T. cordifolia gum have a good emulsifying and stabilising power which lead to the formation of a good protective matrix for the active ingredient. 18 When increasing the active ingredient concentration to 35 % and decreasing the concentration of gelatin to 30 %, the TP and TF decrease also and the values are 710 mg G.A.E/100 g.P and 36.5 mg Q.E/100 g.P respectively. Indeed, the active ingredient incorporated into the system affects the encapsulation yield because when it is in excess, part of it remains in solution and there is saturation at the membrane binding sites.…”

“…T. cordifolia was collected in May 2021 in a village called Dang located in Ngaoundere which is the capital of the Adamawa region. The barks were cut into pieces of 10 cm of length and dried at 50 °C during 48 hours in an electric drier according to the method of Kamdem et al 18 with slight modifications.…”

“…The gum was extracted from T. cordifolia using the method described by Kamdem et al 18 The ratio of 4:150 (g/mL) of barks/water was used. The barks were infused in distilled water at 50 °C during 1 hour under agitation with a magnetic stirrer.…”

Polysaccharide Composite Alginate–Pectin Hydrogels as a Basis for Developing Wound Healing Materials

“…However, synergistic interactions with alginate are relatively rare, even though, from a molecular perspective, alginate is capable of forming hydrogen bonds with various polysaccharides [ 52 ]. So far, synergism has been identified with pectin and xanthan gum [ 53 ].…”

Investigation of rheological, physicochemical, and sensorial properties of traditional low‐fat Doogh formulated

“…Also, in the sample containing xanthan, its unique and symmetrical structure made it less susceptible to microbial utilization. Additionally, the mixed sample benefited from the synergistic properties of hydrocolloids, which acted synergistic properties against starter culture and microbial flora growth that prevented changes in pH in the Doogh structure (Kamdem et al, 2020; Ranadheera et al, 2010; Williams & Phillips, 2021). Also, Solltani et al (2012) pointed out that pH of Iranian drink (Doogh) was lower than 4.5.…”