College of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road Zhenjiang, Jiangsu, 212013, China.
J Sci Food Agric. 2014 Mar 30;94(5):1005-12. doi: 10.1002/jsfa.6361. Epub 2013 Oct 9.
Liquid extracts from pomegranate peel have the potential for use as natural antioxidant products. This study investigates the quality changes of liquid extracts before and after thermal treatment during sterilization and storage. Liquid pomegranate peel extracts were prepared, sterilized under ultra-high temperature (UHT) at 121 °C for 10 s and then stored at three temperatures (4, 25 and 37 °C) for up to 180 days. The industrial, color, UV-visible spectrum profile and antioxidant (phenolics) characteristics were measured.
Thermal sterilization treatment had no negative effects on the industrial, color, spectral and antioxidant characteristics of the extracts. After 180 days, the extracts stored at 4 °C retained 67% of the initial total soluble phenolic content and 58% of the original scavenging activity. The major antioxidant components in the extracts (stored at 4 °C for 180 days) were gallic acid, punicalagin A, punicalagin B and ellagic acid having concentrations of 19.3, 197.2, 221.1 and 92.4 mg L⁻¹, respectively.
The results show that liquid pomegranate peel extracts had acceptable thermal stability after sterilization and storage. The recommended storage condition of this product was low temperature.
石榴皮的液体提取物具有作为天然抗氧化产品的应用潜力。本研究调查了液体提取物在灭菌和储存过程中的热处理前后的质量变化。制备了液体石榴皮提取物，在 121°C 下超高温（UHT）处理 10 秒进行灭菌，然后在三个温度（4、25 和 37°C）下储存长达 180 天。测量了工业特性、颜色、紫外-可见光谱曲线和抗氧化（酚类）特性。
热灭菌处理对提取物的工业、颜色、光谱和抗氧化特性没有负面影响。在 180 天之后，在 4°C 下储存的提取物保留了初始总可溶性酚含量的 67%和原始清除活性的 58%。提取物中的主要抗氧化成分（在 4°C 下储存 180 天）分别为没食子酸、安石榴甙 A、安石榴甙 B 和鞣花酸，浓度分别为 19.3、197.2、221.1 和 92.4mg/L。
结果表明，液体石榴皮提取物在灭菌和储存后具有良好的热稳定性。该产品的推荐储存条件为低温。
