文摘
Ultrasound extraction of proanthocyanidins from Psidium guajava was established. Best conditions: 50% acetone/water (v/v), 48xA0;°C, 30xA0;min, and 0% acetic acid (v/v). Low oxidized guava leaves reported the greatest procyanidin content by NP-HPLC-FLD. High degree of polymerization (DP1-DP13) has been found in guava leaves.