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The chemical profile of FTRAs determined at Absorbance of 254 nm optical density (OD) by HPLC-UV analysis. (A) The standard curves for each compound. (B) The chemical contents of FTRAs: aloe-emodine, rhein, emodin, chrysophanol and physcione and their retention times at 3.74, 4.68, 7.28, 9.77, and 13.38 min, respectively.
