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OBJECTIVE: To study the effects of the drying processing in terms operational parameters on the bioactive constituents of six Yuanzhi(Radix Palygalae)samples across China.METHODS: Six Yuanzhi(Radix Palygalae) samples were investigated using thermogravimetry analysis. The heating courses were set in two ways: thetemperature-programmed process from room temperature to 150℃,and the constant-temperature course at 50℃, 70℃ and 90℃.RESULTS: The peak temperature of six Yuanzhi(Radix Palygalae) samples ranged from 78℃ to 88℃.The mass loss rate ofYuanzhi(Radix Palygalae) alcohol-soluble extract was significantly increased when heated at 90℃. Four types of bioactive ingredients were detected in volatile oils of Yuanzhi(Radix Palygalae) sample from Shanxi province by Gas Chromatography-mass spectrometry analysis. Fourier Transform Infrared Spectroscopy results showed that the drying temperature exerted a great influence on types and amount of ingredients of Yuanzhi(Radix Palygalae). The kinetic study showed that the constant-temperature drying process ofYuanzhi Radix Palygalae) samples could be well described by the Page Model, especially for the drying process at 50℃, in which R2and SD values were more than 0.98 and less than 0.04, respectively. The drying constant k of three Yuanzhi(Radix Palygalae) samples from Shanxi, Gansu and Shaanxi provinces in China was corresponding to the Arrhenius equation, and their activation energies were28.07, 25.38 and 21.48 kJ/mol, respectively.CONCLUSION: The drying process of Yuanzhi(Radix Palygalae) was very important for bioactive ingredients improvement in Yuanzhi(Radix Palygalae). Temperature was a thermodynamic property significantly affecting the process.
OBJECTIVE: To study the effects of the drying processing in terms operational parameters on the bioactive constituents of six Yuanzhi (Radix Palygalae) samples across China. METHODS: Six Yuanzhi (Radix Palygalae) samples were investigated using thermogravimetry analysis. The heating courses were set in two ways: the temperature-programmed process from room temperature to 150 ° C, and the constant-temperature course at 50 ° C, 70 ° C and 90 ° C .RESULTS: The peak temperature of six Yuanzhi (Radix Palygalae) samples ranged from 78 ° C to 88 ° C The mass loss rate of Yuanzhi (Radix Palygalae) alcohol-soluble extract was significantly increased when heated at 90 ° C. Four types of bioactive ingredients were detected in volatile oils of Yuanzhi (Radix Palygalae) sample from Shanxi province by Gas Chromatography-mass spectrometry analysis . Fourier Transform Infrared Spectroscopy results showed that the drying temperature exerted a great influence on types and amount of ingredients of Yuanzhi (Radix Palygalae). The kinetic study showed that the constant-temperature drying process of Yuanzhi Radix Palygalae) samples could well be described by the Page Model, especially for the drying process at 50 ° C, in which R2 and SD values were more than 0.98 and less than 0.04, respectively. The drying constant k of three Yuanzhi (Radix Palygalae) samples from Shanxi, Gansu and Shaanxi provinces in China was corresponding to the Arrhenius equation, and their activation energies were 28.07, 25.38 and 21.48 kJ / mol, respectively. CONCLUSION: The drying process of Yuanzhi (Radix Palygalae) was very important for bioactive ingredients improvement in Yuanzhi (Radix Palygalae). Temperature was a thermodynamic property significantly affecting the process.