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Abstract
Coil-to-double helix (c-h) and double helix-to-dimer (h-d) phase transitions of ι-carrageenan in various cation (CaCl2) solutions upon heating and cooling were studied using the photon transmission technique. Photon transmission intensity, I tr, was monitored against temperature to determine the (c-h) and (h-d) transition temperatures (T ch and T hd) and activation energies (ΔE ch and ΔE hd). An extra dimer-to-dimer (d-d) transition was observed during cooling at low temperature region. However, upon heating dimers directly decompose into double helices by making dimer-to-double helix (d-h) transition. Further heating results in double helix-to-coil (h-c) transition at high temperature region. T dh and T hc temperatures and ΔE dh and ΔE hc activation energies were determined. It was observed that T hc and T ch temperatures and ΔE ch and ΔE hc activation energies were found to be strongly correlated to the CaCl2 content in the system.
