Experiment on microwave drying lotus root

1 materials and methods

1.1 materials and reagents

"Beauty Red Lotus Root: In May 2012 by the Jiangsu Province Yangzhou Baoying County Tianhe Food Co., Ltd. Lotus root is tender and tender, with pure white color and no obvious mechanical injury. After washing and peeling lotus root, the lotus root was sliced into 5-6 mm thick slices with stainless steel knife, and immediately soaked in 0.2% citric acid and 0.2% citric acid.

Microwave Drying Equipment 

1% sodium chloride color protector, half an hour later take out, blanching in boiling water for 3 minutes, flow water cooled to room temperature, put in 2% maltodextrin solution soaked for 1 hour, take out and drain, put in the refrigerator about - 18, freeze and reserve. The initial moisture content of lotus root slices before microwave drying is about

84%.

Citric acid, sodium chloride, maltodextrin are food grade; ascorbic acid, 2,6-dichloroindophenol, Folin reagent, acetone, sodium bicarbonate, oxalic acid, gallic acid, sodium carbonate are analytical pure.

1.2 instruments and equipment

DHG-9073B5-III Electric Heating Constant Temperature Blasting Drying Box (Shanghai Xinmiao Medical Device Manufacturing Co., Ltd.); MVD-1 Microwave Drying Equipment (Nanjing Xiaoma Mechanical and Electrical Equipment Factory); QDPH-5 Electric Heating Air Expansion Equipment (Tianjin Qinde New Material Technology Co., Ltd.);QTS texture analyzer (CNS Farnell, UK); FW100 high-speed universal crusher (Tianjin Tester Instrument Co., Ltd.); FA2104 cushion analysis balance (Beijing Saidoris Scientific Instrument Co., Ltd.); WSC-S color difference analyzer (Shanghai Precision Scientific Instrument Co., Ltd.); JSM-

5610LV scanning electron microscope (Japan Electronics);

JFC01600 gold plating instrument (Japan Jeol company).

microwave drying lotus root