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Sucrose is one of the most abundant pure organic chemicals in the world and the one most widely known to nonchemists. In recent years, sucrose is reported as a functional material for developing alternative biofuel cells which use biocatalysts to convert energy from sugar into electrical power. However, melting points among sucrose crystals with high purity are occasionally different with each other and the melting points quoted references range from 160°C to 192°C . Although many researchers have studied on the melting point by using differential scanning calorimetry (DSC) or optical microscope, there are few reports on the microscopic observation of the crystalline noncrystalline phase transition of sucrose. In the present work, using high-temperature X-ray diffraction (HTXRD) and simultaneous instruments for X-ray diffractometry and differential scanning calorimetry (XRD-DSC), we have investigated some possible factors involved in the noncrystallization from the crystalline state under isothermal and non-isothermal conditions. The sucrose from commercial source and its recrystallized one were used. XRD-DSC results showed the occurrence of two peaks around 150 °C and 175°C for recrystallized sucrose at heating rate of 10°C/min, while no significant change in the XRD patterns at the first peak was observed during the heating process. The noncrystallization point moved to high temperature as the rate of heating was increased. The Rietveld analysis of HTXRD data is a key point for understanding the mechanism and kinetics of crystalline-noncrystalline phase transition of sucrose under isothermal condition.

X-ray structure and hydrogen-bonding study of taurine andN-(glucitol-1-yl)taurine