《Table 2 Scheme and results of the orthogonal test》

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《Optimization of Extraction Process of Zihua Qinghuo Capsule by Orthogonal Test》

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With decoction pieces of five Chinese herbs including V.philippica and S.ningpoensis as test materials，three factors，amount of water added，decoction time and decoction times were investigated，and each factor was selected with three different levels.Yield of dry extract and extracting amount of quercetin were selected as the optimum-seeking indices to determine a rational process.Under a parallel operation condition，an orthogonal test was designed according to L9（34）table.The levels of factors are shown in Table 1.