Abstract
Effects of partial replacement of gelatin in simulated gummy confections with either high acyl or deacylated gellan on their textural, rheological, and thermal properties were investigated. Atomic force microscopy (AFM) images of high acyl and deacylated gellan revealed that both gellan types formed finely stranded networks as a result from air-drying of dilute aqueous solutions, the strand thickness of which was approximately 0.5–1 nm. Simulated gummy confections containing 5.025–7.1 % w/w gelatin, 0–0.075 % w/w high acyl or deacylated gellan, and 73–75 % w/w corn syrup and sucrose combined were prepared and analyzed using texture profile analysis (TPA) and small amplitude oscillatory shear measurements. The principal component analysis (PCA) of textural attributes obtained from TPA identified a cluster in the first quadrant formed by samples containing 7.1 % w/w gelatin but no gellan and those containing 6.025 % w/w gelatin and 0.075 % w/w high acyl or deacylated gellan. All simulated gummy confections showed storage modulus (G′) values greater than loss modulus (G″) values at 0.1 rad/s, G″ increasing more steeply with increasing angular frequency, and G′-G″ crossovers within the examined angular frequency range (0.1–100 rad/s), typical of high solid biopolymer gels. Furthermore, increasing gellan concentration at a total concentration of the gelling agents (i.e., gelatin and gellan) of 6.1 % w/w increased the melting temperature. These results attest the feasibility of improving the heat stability of gummy confections by the partial replacement of gelatin with either high acyl or deacylated gellan with maintaining textures characteristics of gummy confections containing gelatin as the only gelling agent.
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Acknowledgments
This work was partially supported by the Pennsylvania manufacturing confectioners’ association (PMCA). We thank Professor Richard W. Hartel for valuable discussions and letting us use his laboratory equipment.
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Ikeda, S., Henry, K. Effects of Partial Replacement of Gelatin in High Sugar Gels with Gellan on their Textural, Rhelogical, and Thermal Properties. Food Biophysics 11, 400–409 (2016). https://doi.org/10.1007/s11483-016-9454-3
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DOI: https://doi.org/10.1007/s11483-016-9454-3