Absrtact: Portulaca oleracea was treated by hot air drying, vacuum microwave drying and vacuum freeze drying respectively. The total phenol content, total antioxidant capacity, reduction capacity, DPPH scavenging capacity, hydroxyl radical scavenging capacity and superoxide anion radical scavenging capacity of the methanol extract of Portulaca oleracea powder were determined. The total phenol content and antioxidant capacity of Portulaca oleracea powder were studied by different drying methods. Influence.
The results showed that the content of total phenols in Portulaca oleracea powder prepared by microwave drying equipment was significantly higher than that of vacuum microwave drying and hot air drying.
The total antioxidant capacity, reduction capacity, DPPH and hydroxyl radical scavenging capacity of methanol extract of Portulaca oleracea powder prepared by vacuum freeze-drying method were significantly higher than those of Portulaca oleracea powder prepared by vacuum microwave and hot air drying method (P < 0.05), but the clearance of O-. by vacuum freeze-drying sample and vacuum microwave drying sample was higher than that by vacuum microwave drying method (P < 0.05). There is no significant difference in the removal rate. Considering the product quality and processing cost, the vacuum microwave drying method is more reasonable.
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