Optimization of Drying Parameters for Microwave Drying Process of Pandan Using Response Surface Methodology, and Quality Analysis of Pandan Power

Abstract

Abstract method microwave power 12 Kw, drying time 13.33 min, and material thickness 1.92 cm. Under this condition, the measured value of the rehydration ratio of the microwave dried leaves was 4.46 ± 0.05 g·g− 1, which was close to the predicted value of 4.44 g·g− 1. At the same time, by analyzing the color, chlorophyll content, particle size, key volatile component content and other related quality indicators of microwave dried Pandan powder, it was concluded that the color difference △L of Pandan powder processed under this drying process was 10.55 ± 1.94, △a was − 0.20 ± 0.14, △C was 5.39 ± 2.94, the total chlorophyll content was 5.11 ± 0.06 mg·g− 1, the D50 of the powder was 92.73 ± 0.49µm, and the specific surface area was 205.70 ± 0.72 m2·kg− 1. The content of 2-acetyl-1-pyrroline was 0.07 ± 0.01 mg·g− 1, and the content of squalene was 2.28 ± 0.06 mg·g− 1. Its each index is better than oven drying powder. Compared with ordinary oven drying, the microwave drying powder optimized in this experiment had better color, emerald green, shiny, bright color, and smaller powder particles. The content of 2-acetyl-1-pyrroline and squalene was higher, which was better than that of ordinary oven drying.