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Table 1 The orthogonal test of four factors at three different levels

From: Tannin extracts from immature fruits of Terminalia chebula Fructus Retz. promote cutaneous wound healing in rats

Factors A duration of extraction (hour) B maceration time(min) C extract-solvent ratio(times) D number of extraction(times)
1 1 20 10 1
2 1.5 40 15 2
3 2 60 20 3