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Fresh lychee and lychee in syrup were subject to various pressure (200-600 MPa),temperature (20-60 ℃) and time (10 or 20 min) and subsequently analysed for peroxidase (POD) and polyphenol oxidase (PPO) activities.The optimal pH for lychee POD and PPO were 5.0-8.0 and 7.0 respectively.