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

Lima, Aline Margarete Furuyama; Soldi, Valdir

doi:10.1590/s0103-50532009000900020

Cited by 35 publications

(17 citation statements)

References 52 publications

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“…For this reason, respective values of K (0.0073) and α (0.92) for commercial alginate were used to calculate molecular weight of "our" native alginate. Resulted value, 357 kD, is in good correlation with many reported results [20][21][22]. In case of linear proteins, as gelatine, the Mark-Houwink-Sakurada equation usually in form of Eq.…”

Section: Molecular Weights Of High Molecular Polymeric Compounds (Hmcsupporting

confidence: 86%

“…Thus, the molecular weights of linear biopolymers ranges from 10 3 D to 10 6 D (1…1000kD) [2,19]. Secondly, the HMCs molecular weight is almost always seeming, owing to intra-and intermolecular interactions, taking place in the HMCs solutions under the infl uence of various physical and chemical factors [20]. This is especially characteristic for the macromolecules of proteins and polysaccharides, such as gelatine, alginate, and hyaluronate, because their properties are pH-dependent, due to their polyionic structure, containing acidic or basic functional groups.…”

Section: Molecular Weights Of High Molecular Polymeric Compounds (Hmcmentioning

confidence: 99%

“…So-called viscosimetric molecular weight of most types of polymers is usually calculated by Mark-Houwink-Sakurada equation, Eq. (2) [20,21]: (2) where, K and α -constants, properly for the pair polymer-solvent; Samples of alginate, separated from thallus of Laminaria Japonica, possess intrinsic viscosity [η] = 9.37 % -1 , or 937 mL/g in other units. This value is close to intrinsic viscosity of commercial alginate (Sigma-Aldrich Corporation, USA), equal to 1040 mL/g [21].…”

Section: Molecular Weights Of High Molecular Polymeric Compounds (Hmcmentioning

confidence: 99%

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Phase Diagram of Gelatine-Polyuronate Colloids: Its Application for Microencapsulation and Not Only

Baerle¹,

Dimova²,

Urumoglova³

et al. 2016

ChemJMold

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Abstract. Phase state and the charge of colloidal particles in the gelatine-polyuronate system were studied. A method for comparative evaluation of molecular weight of colloids by means of viscosimetric measurements and electrophoresis was developed. It is shown that the Diagram {Phase state = f (composition, pH)} contains six welldefi ned regions. The diagram explains and predicts the behaviour of protein-polysaccharide colloids, which are included in beverages or forms the shells of oil-containing microcapsules.Keywords: protein-polysaccharides, colloids, electrokinetic potential, phase diagram, microcapsules. IntroductionPoorly soluble or electro-statically agglomerated macromolecular compounds derive from interaction of protein zwitterions with polyanions, in particular, with polyuronic acids and their salts [1]. These interactions are of great practical interest, insofar as much of foods contain biopolymers in different combinations [2]. Recently, there were published many papers devoted to the joint use of the proteins and polysaccharides, originate from different natural raw materials, in various pharmaceutical and food systems [3][4][5][6]. These compounds have a greater ability to precipitate the colloidal suspensions, compared to pure linear polymers [7]. It is believed that these mixtures are in fact the covalent chemical compounds or supra-molecular three-dimensional structures with high molecular weight, charged as zwitterions due to the presence of proteins [8][9][10]. Due to this fact, the mixtures are capable to precipitate not only the neutral particles, but also charged particles, both positive and negative. Such three-dimensional structures (3D) appear also during the complex coacervation of oppositely charged macromolecules on the oil droplets surface in the microencapsulation processes [11]. The optimum conditions of precipitation of alginate-gelatine coacervates were obtained in vitro, using measurements of turbidity and viscosity [1].The study led to the elaboration of different phase diagrams, which refl ects complex interactions between the negatively charged polysaccharides and zwitterions of proteins [8,12,13]. The interaction of proteins with polysaccharides was described in numerous research papers, but not in the exhaustive form. Among the problematic issues it can be identifi ed the determination of the molecular weight of the resulting supramolecular structures. In our view, the estimation of the molecular weights will be useful for calculating of the microcapsule shells parameters, as well as to determine the conditions of deposition of neutral colloidal particles. Detailed analysis of the phase state of the gelatine-polyuronate system is important to determine the optimal sedimentation conditions, or opposite, to prevent the coagulation of proteins by small amounts of extraneous poly-anions. In constructing of the phase diagram of the gelatine-polyuronate, it is important to consider the sign and magnitude of charge of generated complexes. Unambiguous information about the char...

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Section: Molecular Weights Of High Molecular Polymeric Compounds (Hmcsupporting

confidence: 86%

Section: Molecular Weights Of High Molecular Polymeric Compounds (Hmcmentioning

confidence: 99%

Section: Molecular Weights Of High Molecular Polymeric Compounds (Hmcmentioning

confidence: 99%

See 1 more Smart Citation

Phase Diagram of Gelatine-Polyuronate Colloids: Its Application for Microencapsulation and Not Only

Baerle¹,

Dimova²,

Urumoglova³

et al. 2016

ChemJMold

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“…De acordo com o DE, as pectinas são divididas em duas classes: pectinas de alto grau de metoxilação, quando DE > 50%, e pectinas de baixo grau de metoxilação, com um DE < 50% 44,58 .…”

Section: Pectinaunclassified

Biopolímeros: aplicações farmacêutica e biomédica

et al. 2016

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____________________________________________________________________________Resumo: O estudo e desenvolvimento de polímeros para aplicação nas áreas biomédica e farmacêutica têm aumentado devido às suas propriedades peculiares que contribuem para a melhoria da qualidade de vida, como por exemplo, os polímeros usados em medicina regenerativa e sistemas de liberação de fármacos. O desenvolvimento de novos materiais baseados em polímeros depende desde os métodos de síntese, extração ou composição desses materiais até os estudos da influência de suas estruturas e propriedades em aplicações específicas, entre outras. Esta revisão descreve o uso de alguns de polímeros novos e convencionais com potencial para aplicação nas áreas farmacêutica e biomédica, enfatizando as principais propriedades que os tornam aplicáveis. Palavras-chave: biopolímero, medicina regenerativa, liberação de fármacos ____________________________________________________________________________ Abstract:The study and development of polymers for pharmaceutical and biomedical use has been increasing due to their peculiar properties that contribute for the improvement of the life quality, such as the polymers used in regenerative medicine and in drug release systems. The development of new polymer based materials and its composites depends on several steps, such as the synthesis approach, the extraction, the composition, the influence of their properties on the specific applications, and others. This review describes the use of conventional and new polymers with potential application in pharmaceutical and biomedical fields, highlighting the properties that allow them to be useful for such purposes.

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“…Researchers [15] demonstrated the importance of the behavior of the flow of dispersedly formed films, where dispersion characteristics have an important influence on the surface smoothness and look of a coat. The coat quality in the solid state depends on properties of the fluidity of a liquid film.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Role of Plasticizers in Film-Forming Coats for Protecting Cooled Meat

Kyshenia

Віннікова

Volovik

et al. 2018

EUREKA: Life Sciences

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As a result of theoretical studies on problems of protection and prolongation of storage terms of meat, it was revealed, that one of promising directions is to use protecting coats, based on natural biopolymers. The topicality of this study is in studying film-forming coats, based on natural polysaccharides, because they have high mechanical indices, absence of a smell, taste and are subjected to biological destruction. For regulating mechanical properties, the composition of film-creating coats is added with plasticizers of different origins. The aim of this work is in describing characteristics of food films, based on carrageenan, sodium alginate and plasticizers of different origins. There were mechanical, rheological properties of protecting coats. The comparative characteristic of these properties, depending on an added plasticizer, was realized. The type and mechanisms of interaction of components of the film-forming coat and plasticizers were completely described. The viscosity of the film-forming coat with a plasticizer has less values comparing with other solutions. Adding plasticizers resulted in increasing the film elasticity, but at the same time some increase of the firmness was observed. Film-forming coats with adding a plasticizer had a higher limit of fluidity, so they were firmer than complex film-forming coats without a plasticizer. From the other side, deformation values of film-forming coats without adding a plasticizer were higher than ones of complex film-forming coats with adding a plasticizer, because they were firmer. The study of physical properties of developed film-forming coats, based on hydrocolloids, demonstrated that coats with a plasticizer have more gas permeability. According to the results, obtained at experiments it was established, that the film-forming coat, based on sodium alginate, carrageenan and glycerin, has best mechanical, physical and rheological indices.

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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

Cited by 35 publications

References 52 publications

Phase Diagram of Gelatine-Polyuronate Colloids: Its Application for Microencapsulation and Not Only

Phase Diagram of Gelatine-Polyuronate Colloids: Its Application for Microencapsulation and Not Only

Biopolímeros: aplicações farmacêutica e biomédica

Investigation of the Role of Plasticizers in Film-Forming Coats for Protecting Cooled Meat

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