Melting behaviour of D-sucrose, D-glucose and D-fructose

Carbohydrate Research
Minna HurttaJuha Knuutinen

Abstract

The melting behaviour of d-sucrose, d-glucose and d-fructose was studied. The melting peaks were determined with DSC and the start of decomposition was studied with TG at different rates of heating. In addition, melting points were determined with a melting point apparatus. The samples were identified as d-sucrose, alpha-d-glucopyranose and beta-d-fructopyranose by powder diffraction measurements. There were differences in melting between the different samples of the same sugar and the rate of heating had a remarkable effect on the melting behaviour. For example, T(o), DeltaH(f) and T(i) (initial temperature of decomposition) at a 1 degrees Cmin(-1) rate of heating were 184.5 degrees C, 126.6Jg(-1) and 171.3 degrees C for d-sucrose, 146.5 degrees C, 185.4Jg(-1) and 152.0 degrees C for d-glucose and 112.7 degrees C, 154.1Jg(-1) and 113.9 degrees C for d-fructose. The same parameters at 10 degrees Cmin(-1) rate of heating were 188.9 degrees C, 134.4Jg(-1) and 189.2 degrees C for d-sucrose, 155.2 degrees C, 194.3Jg(-1) and 170.3 degrees C for d-glucose and 125.7 degrees C, 176.7Jg(-1) and 136.8 degrees C d-fructose. At slow rates of heating, there were substantial differences between the different samples of the same sugar. The me...Continue Reading

References

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