Physicochemical Properties of Konjac Glucomannan Gels
Summary
Konjac glucomannan (KGM) is a high-molecular-weight, water-soluble polysaccharide derived from the tubers of Amorphophallus konjac. The gelation of KGM arises primarily through a combination of heat-induced helix aggregation and alkali-mediated deacetylation, leading to the formation of a three-dimensional network capable of entrapping large volumes of water. Gel strength, elasticity and thermal stability are governed by the degree of polymerisation, the acetyl content on the glucomannan backbone and the conditions of alkali treatment. Rheological profiles of KGM gels typically exhibit solid-like behaviour, with storage modulus (G′) exceeding loss modulus (G″) over a broad frequency range. Microstructural analyses reveal a fibrous or fibrillar network whose porosity and strand thickness depend on preparation parameters such as pH, ionic strength and temperature profile. Molecular weight influences chain entanglement and viscoelasticity: higher-weight fractions yield stronger, more elastic gels, while controlled degradation can tailor gel firmness and water retention. Applications span low-calorie foods, biodegradable materials and tissue-engineering scaffolds, reflecting the unique capacity of KGM gels to combine biocompatibility with tunable mechanical and water-binding properties.
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Physicochemical Properties of Konjac Glucomannan Gels publication trend
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Technical terms
Gelation: The transition of a polymer solution into a semi-solid network capable of entrapping water.
Deacetylation: Removal of acetyl groups from the polysaccharide chain, promoting intermolecular hydrogen bonding and helix aggregation.
Storage modulus (G′): A measure of elastic response in oscillatory rheology, indicating energy stored in a gel network.
Loss modulus (G″): A measure of viscous response in oscillatory rheology, indicating energy dissipated as heat.
Microstructure: The internal architecture of a gel, including pore size, strand thickness and network connectivity.
Viscosity: Resistance to flow; in polysaccharide solutions, it reflects chain entanglement and molecular weight.
References
- A Review on Konjac Glucomannan Gels: Microstructure and Application. International Journal of Molecular Sciences (2017).
- Review of Konjac Glucomannan Structure, Properties, Gelation Mechanism, and Application in Medical Biology. Polymers (2023).
- Effects of Enzymatic Konjac Glucomannan Hydrolysates on Textural Properties, Microstructure, and Water Distribution of Grass Carp Surimi Gels. Foods (2022).
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