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Stability of free phlorotannin (1) and PPNPS (1:6(2), 1:8(3), 1:10(4)) at room temperature (22 ± 3 °C) (A: Original state; B: Adding water; C: Mixture; D: Standing for 5 days; E: Standing for 10 days; F: Standing for 15 days). The concentration of every sample was 20 mg/mL (100 mg solid sample mixed with 5 mL water).
