It could be observed that the adsorption effect showed an increasing trend with increasing pH.
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Phenylboronic Acid and Amino Bifunctional Modified Adsorbent for Quickly Separating Phenolic Acids from Crude Extract of <i>Clerodendranthus spicatus</i> and Evaluation of Their Antioxidant and Hypoglycemic Activities.
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The sentences
Then, as the pH increased from 4 to 8, the adsorption showed a decreasing trend.