Structural and mechanical properties of a range of chitosan-based hybrid networks loaded with colloidal silica and polystyrene particles

Ryan, C.; Bardosova, Maria; Pemble, Martyn E.

doi:10.1007/s10853-017-1051-4

Cited by 20 publications

(14 citation statements)

References 27 publications

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“…Polymer chains of medium size are more flexible and can retain a higher proportion of fat molecules inside the particle. Longer polymer chains are usually associated with molecular entanglement and a higher degree of crystallinity due to stronger intramolecular interactions and formation of particle aggregates that reduce the fat binding capacity, 66–69 corroborating the results in Table 2. Moreover, Czechowska‐Biskup et al 70 evaluated the fat‐binding capacity of radiated and sonicated chitosan samples with DD of about 88% and M v ranging from 25 to 408 kDa.…”

Section: Resultssupporting

confidence: 80%

Chitosan preparations with improved fat‐binding capacity

Silva

Gasparrini

Cremonez

et al. 2021

J of Applied Polymer Sci

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Chitosan is a polycationic polysaccharide with good health and nutritional benefits. This study investigated the effect of chitosan properties, such as, biopolymer structure, viscometric molar mass (Mv), and degree of deacetylation (DD), on the fat‐binding capacity between five chitosan preparations (different origins and characteristics) and three types of fat (soybean oil, margarine, and pork lard). The in vitro fat‐binding tests were performed with soybean oil under different pH to simulate the digestion process in the gastrointestinal tract, followed by tests at constant pH (duodenal pH = 6.8) with three types of fat. Shrimp shell nanochitosan had an average hydrodynamic diameter of 62 nm, while that of shrimp shell chitosan and commercial chitosans (CC1, CC2, and CC3) ranged between 1090 and 1405 nm (determined by DLS). The Mv of chitosan varied between 18 and 260 kDa, and the DD ranged from 62% to 92%. Chitosan with medium Mv and high DD presented better results of fat‐binding capacity in the duodenal pH with soybean oil. This study provides insights into the mechanisms of fat‐binding capacity and its correlation with physicochemical properties of chitosan, pH, and type of fat, allowing the production of chitosan‐based products with improved fat‐binding capacity for several applications.

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Section: Resultssupporting

confidence: 80%

Chitosan preparations with improved fat‐binding capacity

Silva

Gasparrini

Cremonez

et al. 2021

J of Applied Polymer Sci

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“…See Figure 3 for the associated IR spectrum. Full assignment of the IR spectra is available in [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

“…The tests carried out investigated the effect of the presence of Ag and Au NPs with a diameter of 20 nm. Results showed that both NP types produced hybrid membranes capable of reaching mechanical stresses of up to 74 MPa, compared to 75 MPa ± 29% for the Chi-TEOS IPN [ 28 ]. This value was reached with the lowest concentration of metal NPs used and increasing this concentration made little or no change to the mechanical stress reached by the membranes.…”

Section: Resultsmentioning

confidence: 99%

“…Surface roughness analysis was carried out using a KLA Tencor P15 profilometer, for further investigation into topological quality; this was done at a scanning rate of 20 μms −1 and a scanning distance of 1000 μm. The same test conditions were employed as in the preceding study [ 28 ] – an Instron 5565 universal testing machine was used to carry out tensile strength tests on the thin film membranes with rectangular geometry of 10 x 40 mm. Test conditions at room temperature included a load of 5 kN, clamp speed of 0.5 mm/min and data rate of 10 pts/s.…”

Section: Methodsmentioning

confidence: 99%

“…This combination results in the formation of an IPN which is flexible, due to the presence of chitosan while also being mechanically strong and insoluble in common aqueous systems, attributed to the siloxane cross-linker providing a structural backbone to the IPN [ 10 ]. This phenomenon was examined in a previous study from our laboratories in which tensile strength tests were carried out before and after cross-linking [ 28 ]. Plain chitosan exhibited elastic behaviour, tearing continuously under much less strain in comparison to the cross-linked Chi-TEOS IPN which demonstrated better mechanical strength, with sudden fracture of the membrane occurring at much higher stress levels.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterisation of cross-linked chitosan composites functionalised with silver and gold nanoparticles for antimicrobial applications

Ryan

Alcock

Buttimer

et al. 2017

Science and Technology of Advanced Materials

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We present a study of a range of cross-linked chitosan composites with potential antimicrobial applications. They were formed by cross-linking chitosan and siloxane networks and by introducing silver and gold nanoparticles (NPs). The aim was to investigate whether adding the metal NPs to the chitosan-siloxane composite would lead to a material with enhanced antimicrobial ability as compared to chitosan itself. The composites were synthesised in hydrogel form with the metal NPs embedded in the cross-linked chitosan network. Spectroscopic and microscopic techniques were employed to investigate the structural properties of the composite and the tensile strength of the structures was measured. It was found that the addition of metal NPs did not influence the mechanical strength of the composite. A crystal violet attachment assay results displayed a significant reduction in the attachment of E. coli to the cross-linked chitosan surfaces. Release profile tests suggest that the metal NPs do not contribute to the overall antimicrobial activity under neutral conditions. The contribution to the mechanical and antimicrobial properties from cross-linking with siloxane is significant, giving rise to a versatile, durable, antimicrobial material suitable for thin film formation, wound dressings or the coating of various surfaces where robustness and antimicrobial control are required.

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