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In situ photon transmission method was applied to study thermal phase transitions of ι-carrageenan in CaCl 2 solution. Coil-to-helix (c–h) and helix-to-dimer (h–d) transitions were detected upon cooling. An extra dimer-to-dimer (d–d) transition was observed as well during cooling at low-temperature region. Upon heating only dimer-to-helix (d–h) and helix-to-coil (h–c) transitions were detected...
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