Absrtact: Fresh iron stick yam was used as material to dry by means of on-line control of material temperature and thickness in microwave drying by inserting optical fiber into material center, drying processing was carried out by single factor test method, polysaccharides in samples were extracted by Soxhlet extraction method, and polysaccharide yield of samples prepared by different drying parameters was determined by phenol-sulfuric acid colorimetry. The microwave drying equipment was used to record the weight and control the temperature of the material. The color difference meter was used to measure the color of the sample and evaluate the drying effect.
The results showed that the material temperature of the highest polysaccharide yield was 50 C and the whiteness value was the highest, but the drying time was the longest when the material temperature was different and the thickness was 5 mm. When the material temperature was 60 C, the material thickness of the highest polysaccharide yield was 5 mm. Comprehensive comparison shows that the drying effect of microwave drying is better when the temperature is 60 C and the material thickness is 5 mm.
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