IMPACT OF THE MODE OF CONVECTIVE DRYING ON THE CRYSTALLINITY OF APPLE AND SUGAR BEET POWDERS


  • V.A. Mykhailyk Institute of Engineering Thermophysics of National Academy of Sciences of Ukraine, 2a, Zhelyabova str., Kiev, 03057, Ukraine
  • Yu.F. Snezhkin Institute of Engineering Thermophysics of National Academy of Sciences of Ukraine, 2a, Zhelyabova str., Kiev, 03057, Ukraine
  • T.V. Korinchevska Institute of Engineering Thermophysics of National Academy of Sciences of Ukraine, 2a, Zhelyabova str., Kiev, 03057, Ukraine
  • Yu.I. Gornikov Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov Str., Kyiv, 03164, Ukraine
Keywords: drying, sugar beet, apple, crystallization, sucrose, glucose, fructose, derivatography, X-ray diffraction, phase transitions, the degree of crystallinity

Abstract

The effect of temperature of the convecting drying on the crystallinity of apple and sugar beet powders was presented in this study. The X-ray diffraction and derivatography methods were used. The data of thermal analysis revealed that with increasing of drying temperature from 60 to 100 °C at a constant speed of drying agent (1.5 m/s), the degree of crystallinity was reduced from 34.0 % wt. to 20.4 % wt. and from 11.1 % wt. to 7.7 % wt. for the sugar beet and apple powders, respectively. The X-ray diffraction method showed that the crystallinity of sugar beet and apple powders were 36 % wt. and 34 % wt., respectively. The investigated powders are semicrystalline product according to their degree of crystallinity. E.g., the apple powder is a mixture of amorphous (biopolymers and soluble carbohydrates) and crystalline (glucose, sucrose and fructose) phases.

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Published
2017-11-05
How to Cite
Mykhailyk, V., Snezhkin, Y., Korinchevska, T., & Gornikov, Y. (2017). IMPACT OF THE MODE OF CONVECTIVE DRYING ON THE CRYSTALLINITY OF APPLE AND SUGAR BEET POWDERS. Thermophysics and Thermal Power Engineering, 37(5), 23-37. https://doi.org/https://doi.org/10.31472/ihe.5.2015.03
Section
Theory and Practice of Drying