Abstract
Effects of moisture content and puffing pressure on the extraction yield, crude saponin content, antioxidant activity, and platycoside content of puffed 21-year-old doraji were investigated. Sliced doraji was dried to 4.0, 6.0, and 8.0 g of water/100 g of sample, then puffed at pressures of 686, 784, 882, and 980 kPa. The extraction yield, crude saponin, and antioxidant activity of puffed doraji, compared with non-puffed doraji, increased from 35.9 to 52.7 g/100 g of dried doraji, from 34.4 to 70.5 mg/g of dried doraji, and from 34.0 to 138.1 mg of vitamin C equivalent (VCE)/g of dried doraji, respectively. Levels of the major platycosides, platycoside E, platycodin D, and D3 of puffed doraji were reduced as the puffing pressure increased. Puffing can be a favorable unit process resulting in a higher extraction yield, total crude saponin content, and antioxidant activity of doraji.
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