Papers by Keyword: Konjac Glucomannan

Abstract: Jackfruit (JS)-konjac glucomannan (KGM) blend films were prepared using different concentrations of JS, KGM and glycerol. Their mechanical properties were determined. All the films exhibited significantly higher values of tensile strength and elongation at break than those of neat JS films. The values varied considerably depending on KGM and glycerol content. Quercus infectoria extract was embedded into the films and its release characteristics were controlled by changing the initial KGM content. This study suggests that the blend film has a potential use for advanced controlled release of bioactive extracts.

Abstract: To meet the needs of consumers desiring for weight-loss food, investigation on phase characteristics of milk protein-konjac glucomannan multicomponent systems with κ-carrageenan was carried out to simulate healthy ice cream product. Methods of rheology, light scattering and microscopy were used to examine the mechanism underlying the transformation of phase behavior. Addition of κ-carrageenan (0%) evidently showed extensive phase separation that casein micelles concentrated into an irregular discrete phase. A high degree of emulsification of spherical micelle droplets occurring in the continuous serum phase prevented bulk phase separation when the κ-carrageenan concentration increased (0.025%, 0.05%). The analysis of rheological characteristics revealed that multicomponent systems with higher κ-carrageenan concentration were more viscous and showed higher thixotropy behavior due to intense interactions between κ-carrageenan and casein micelles. Frequency independence of G and G was also greatly enhanced as concentration of κ-carrageenan increased. Moreover, differences of size distribution evidenced the structure formation of systems in presence of κ-carrageenan. The joint effects of κ-carrageenan helix aggregation and the interaction between casein micelles and κ-carrageenan were contributed to phase behavior transformation.

Abstract: Sodium hyaluronate / konjac glucomannan (SH/KGM) porous scaffolds were prepared via blending sodium hyaluronate and konjac glucomannan. The ammonia was used as cross-linker in blending process. The SH/KGM scaffolds were soaked into calcium nitrate solution and then followed by immersing into simulated body fluid to get SH/KGM/HAP porous scaffolds. X-ray diffraction and fourier transform infrared spectroscopy (FTIR) were used to characterize the crystallization and chemical structure of SH/KGM and SH/KGM/HAP scaffold materials. The scanning electron microscope (SEM) was used to analysis the morphology of SH/KGM/HAP scaffold and BMSCs on surface of the scaffold. The results show that hydroxyl-apatite produced on the surface of the SH/KGM, which appears as spherical particles in the SH/KGM/HAP scaffold surface, and the SH/KGM/HAP porous scaffold possesses good biocompatibility with cell.

Abstract: Rice starch (RS)-konjac glucomannan (KGM) blend films were prepared using different concentrations of RS, KGM and glycerol. Their mechanical properties were determined. All the films exhibited significantly higher values of tensile strength and elongation at break than those of neat starch films. The values varied considerably depending on KG and glycerol content. The Atractylodes lancea extract was embedded into the films and its release characteristics were controlled by changing the initial KG content. This study suggests that the prepared film has a potential use for advanced controlled release of bioactive compounds.

Abstract: Fiber woven membranes were prepared with konjac glucomannan (KGM) and sodium hyaluronate (SH). Glycerol was added as plasticizer and lactic acid as modifier. After treatment with microwave,wet spinning method and the programmable 2D mobile platform were used to prepare the KGM/SH fiber woven membranes. The in vitro degradability of the fiber membranes was tested by PBS immersion. The biological activity of the fiber woven membranes was observed by SBF mineralization experiments. The cytocompatibility was also investigated via co-culture of stem cells. It was revealed that the fiber woven membranes had good biological activity, degradation rate and cytocompatibility, which indicated that the membrane has a good prospect as a potential cartilage scaffold.

Abstract: Unsoluble composite films have been prepared by blending konjac glucomannan (KGM)/sodium hyaluronate (SH) aqueous solution with chitosan (CS) solution in acetate solution, filtering, deaerating, tape casting, drying at 55°C for 8h and crosslinking with the aid of sodium hydroxide solution for 2h. The effect of KGM content on the structure and properties of SH/CS/KGM composite films were investigated. It was indicated that the KGM can significantly improve the tensile strength (σ_b) and breaking elongation (ε_b) of the SH/CS composite films, and the tensile strength (σ_b) and breaking elongation (ε_b) increased with the increase of KGM content in composite films. It was revealed by IR and X-ray analysis that the crystallinity of composite films decreased with the increase of KGM content and the composite films was mainly amorphous. It was indicated via scanning electron microscopy (SEM) and bone marrow mesenchymal stem cell experiments that the films could support the growth of cells and were non-toxicity and good biocompatibility.

Abstract: Fracturing fluid was obtained by putting the organic borate and organic titanium crosslinkers into the base fluid of konjac glucomannan. The properties of the fracturing fluid were also discussed. The system was very stable until the temperature reach to 90°C. The system also performed good shear resistance ability when the shear rate was 170s-1 at 80°C for half an hour. The residue content after gel breaking and the suspended sand performance both satisfied the requirements of the operation.

Abstract: The konjac glucom annan-Carrageenan edible blend films were prepared.The mechanical properties and the optical properties of the edible films were tested. The results showed that the properties of Blend Films is best when the mass ratio of blend films is 3:1, plasticizer glycerin can significantly improve the properties of blend films , this blend films is expected to develop into a new type of edible packaging films.

Abstract: A spherical humidity control composite material with excellent humidity control performances has been prepared by twice foaming method. The composite comprises a natural polymer derivative (KGM), a porous natural mineral (Halloysite) and an Sodium polyacrylate (PAAS). It has high capacity for moisture adsorption, fast response to humidity changes, and small range for equilibrium humidity control. The moisture adsorption content of the composite material is 1.10 (g/g) of its own weight. The moisture absorption rate is 0.3948 (g/7h•g^-1), and moisture desorption rate is 0.4682 (g/7h•g^-1). The composite material has an equilibrium humidity control ranging from 50%RH to 53%RH. It can reach to the equilibrium levels within 60 minutes. It is suitable for maintaining a proper micro-environment for places such as museums or galleries.

Abstract: A novel composite humidity control material was prepared, in which konjac glucomannan grafted on sodium polyacrylate with halloysite loading, adopting aluminum chloride/sodium bicarbonate system to foam, and twice foaming to form porous structure in the composites by heating at 150 °C. The resultant composites were utilized as substrates and applied in a composite humidity control paper making. Humidity performances including hygroscopicity, moisture capacity, moisture absorption and desorption rate were tested. It was found that the composite paper presents good humidity control performances even in amplified experiments.