Spinnability, Morphology and Mechanical Properties of Gelatins With Different Bloom Index

Abstract

The influence of the concentration, viscosity, electrical conductivity and Bloom index of gelatin solutions on the electrospinning process and the fibrous membrane formed was evaluated. Electrospun membranes were produced at different concentrations for three Bloom values (90, 250 and 280); the solutions were evaluated in terms of viscosity and electrical conductivity and the fibrous membranes by SEM and tensile tests. Results indicate that the electrospinning was most successful when the solution viscosity was within the range of 300 to 700 mPa•s, regardless of the type of gelatin used in the investigated conditions. The average fiber diameter increased with the increased solution viscosity and the relationship between them was well described by a linear equation. With regard to the mechanical properties, GeB250 and GeB280 fibrous membranes showed elongation, on average, at least ten times higher than that of GeB90 membranes.

Beyond the Modification Degree: Impact of Raw Material on Physicochemical Properties of Gelatin Type A and Type B Methacryloyls

“…The control of viscosity by the total degree of modification DM(A) at given flexibility of cross‐linking capacity by the ratio of methacryloyl and acetyl functions is of interest with regard to handling of gelatin solutions. For example, for electrospinning viscosities in the range of 0.3–0.7 Pa s are preferred, drop‐on‐demand techniques, i.e. inkjet printing, can process maximum viscosities of 0.01 Pa s, and dispensing of stable structures requires viscosities above 0.03 Pa s .…”

Contactless Vibrational Analysis of Transparent Hydrogel Structures Using Laser-Doppler Vibrometry

“…In addition to the damping ratio, we also extracted the damping constant γ from the data, which is proportional to the viscosity of the gel and grows exponentially with gelatin concentration, as reported in the literature ( Supplementary Fig. 2, see methods section for details or the calculation) [59][60][61].…”

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“…As seen in the Table 2, mean viscosity values of the solutions at room temperature were found to be generally between 15.4 and 21.0 mPa.s. The viscosity values of the collagen hydrolysate solutions were found to increase with increasing CH concentration, which was resulted in a greater number of polymer chain entanglements within the solution [32]. An increase in the viscosity values of the solutions is undesirable because they become lumpy in the nozzle of the electrospinning apparatus, and this causes the formation of non-homogeneous beaded nanofibers.…”

“…These bacteria are spread by direct contact with an infected person, by the use of a contaminated object or by inhalation of infected drops dispersed by sneezing or coughing. Skin infections are common, but bacteria can spread through the bloodstream and can infect distant organs [28][29][30][31][32][33][34].…”