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Detailed investigation of gel–sol transition temperature of κ-carrageenan studied by DSC, TMA and FBM

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Abstract

A broad temperature range of the gel–sol transition of κ-carrageenan was precisely examined by differential scanning calorimetry (DSC), thermomechanical analysis (TMA) and the falling ball method (FBM). κ-Carrageenan the transition temperature of which ranged from 290 to 350 K was used as a representative sample of a thermo-reversible hydrogel. The starting of transition attributed to dissociation of the weak cross-linking zone of aggregated double helices was detected as a change of expansion coefficient by TMA and as an endothermic deviation by DSC. Peak temperature of endotherm by DSC agreed well with the temperature where expansion changed from positive to negative value and this temperature was attributed to gel–sol transition caused by dissociation of double helices’ assembly. Transition temperature measured by FBM was observed at a temperature higher than those obtained by DSC and TMA, which was attributed to decomposition of double helices.

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Acknowledgements

The authors are grateful to Professor Clive S. Langham, Nihon University, for his helpful comments and advice. This work was supported by a Grant from the Otsuma Kotaka Foundation and a Grant-in-Aid for Scientific Research (Young Scientists (B)).

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Correspondence to Tatsuko Hatakeyama.

Appendix

Appendix

In order to obtain reliable results by FBM, preliminary experiments were carried out using 1 % κ-carrageenan hydrogel. Figure 10 shows the relationship between the height of the steel ball and temperature. Steel balls having various sizes as described in the experimental section were used. As shown in Fig. 10, when the size of the steel ball is in a range from 0.8 to 1.5 mm, the height of the steel ball sharply decreases at about 316 K. When the steel ball size was 0.5 mm, the ball moved gradually, indicating the mass of the ball was too light.

Fig. 10
figure 10

Relationship between the height of the steel ball having various diameters and temperature, open circle steel ball size = 0.5 mm, open diamond 0.8 mm, open rectangular 1.0 mm, open triangle 1.2 mm, open inverse triangle 1.5 mm Sample; 1 % κ-carrageenan hydrogel

Figure 11 shows the relationship between gel–sol transition temperature of 1 % κ-carrageenan hydrogel and size of the steel ball. T g−s of 1 % κ-carrageenan hydrogel maintains a constant value, regardless of the size of the steel ball. From the above results, FBM measurements were carried out using a 0.8-mm steel ball.

Fig. 11
figure 11

Relationship between gel–sol transition temperature (T g−s) of 1 % κ-carrageenan hydrogel and size of steel ball

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Iijima, M., Takahashi, M., Hatakeyama, T. et al. Detailed investigation of gel–sol transition temperature of κ-carrageenan studied by DSC, TMA and FBM. J Therm Anal Calorim 114, 895–901 (2013). https://doi.org/10.1007/s10973-013-2953-2

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