Optimization of Vacuum Far-Infrared Radiation Drying of Flos Lonicerae by Response Surface Analysis

Abstract

Abstract: In the present study, a quadratic orthogonal rotation combination design was used to optimize the vacuum far-infrared radiation drying of Flos Lonicerae. A mathematical model describing drying rate or chlorogenic acid content as a function of heat radiation temperature, drying chamber pressure and material feeding amount was established and was analyzed by analysis of variance and response surface analysis. The results showed that both the mathematical regression models were in good agreement with the experimental process. Three drying parameters could be ranked in descending order of their effects on drying rate and chlorogenic acid content as follows: heat radiation temperature ＞ material feeding amount ＞ drying chamber pressure. Drying rate revealed an upward tread with increasing heating temperature and decreasing drying chamber pressure and material feeding. The content of chlorogenic acid increased with decreasing drying chamber pressure and material feeding, and went up slowly and then dropped with increasing heating temperature.

Key words: Flos Lonicerae, vacuum far-infrared radiation drying, mathematical model, response surface analysis

CLC Number:

References

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