Spice Microwave Extraction Technology And Application Technology Research

A study on the technology of dynamic-microwave extraction (DME) and application for spices was carried out from a small test, pilot experiment scale to industrial experiment scale. It is of great value to lay the base for industrial implementation of DME equipment and technology of spices, and it also provide certain scientific reference value for technical innovation of traditional extraction industries.Extract conditions of the static state-microwave extraction (SME) in a small test were optimized by single factor tests and orthogonal experiment method. Extraction rate of black piper nigrum L., laminarin japonica Aresch, pericarpium citri Reticulatae, kaempferia galanga L. and hesperidin respectively was 11%, 26.84%, 27~35%, 7~11% and 2.88%. Detection technology was a recently developed approach to the determination of major effective component contained in the spice extracts. The detection method is simple and rapid, low-cost, accurate and is readily dynamic-monitor to the production process, and it can be utilized in the quantitative determination and product standardization.Based on the SME in a small test by single factor tests, the DME equipment was designed to extract black pepper oleoresin on pilot experiment scale. In the pilot experiment, the 4 parameters were chosen: microwave power, material flux, total solid-liquid ratio and extraction times, the orthogonal experiments L9(34) were carried on to choose the best technics parameters and the results are as follows: 95% ethanol was as solvent, microwave power 2400W, material flux 52 L*h-1, total solid-liquid ratio 1:7 and extraction times 3. Under the above condition, the extraction rate of black pepper oleoresin is 12.69% and the piperine content for the raw material is 4.780%. In the paper, the 2 concepts of microwave effective time and microwave effective irradiation were put forward to explain the problems came from the transform process between SME in the small test and DME in the pilot experiment.Based on DME of black pepper oleoresin in pilot experiment scale, the DME equipment in industrial experiment scale was used to extract piper longum L. oleoresin. In the industrial experiment, the single factor tests were carried on to choose the best production process parameters and the results are as follows: the method of repeated use of solvent was applied to extract piper longum L. oleoresin, 95% ethanol was as solvent, microwave power 3200W, material flux 200 L*h-1, total solid-liquid ratio 1:4 and extraction times 4. Under the above conditions, the extraction rate of piper longum L. oleoresin is 10.45% and the piperine content for the raw material is 2.07%.Energy consumption of industrial experiment scale, pilot experiment scale, small test and solvent extraction (SE) were compared under the same extraction efficiency, the results indicate that energy consumption of industrial experiment scale is 65% of pilot experiment scale, is 31.2% of small test, is 40~70% of ethanol-reflux extraction, and extraction time of industrial experiment scale is 1/10 of ethanol-low temperature extraction. Industrialization test of spices DME obtained better effect than pilot experiment scale, small test and SE. The purposes were realized in energy conservation, improve product quality and yield.