title: Thermal stability of liquid antioxidative extracts from pomegranate peel.
abstract: BACKGROUND
  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.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  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.
authors: College of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road Zhenjiang, Jiangsu, 212013, China.
authors: Wenjuan
authors: W
authors: Qu
authors: Pingping
authors: P
authors: Li
authors: Jihua
authors: J
authors: Hong
authors: Zhiling
authors: Z
authors: Liu
authors: Yufang
authors: Y
authors: Chen
authors: Andrew P
authors: AP
authors: Breksa
authors: Zhongli
authors: Z
authors: Pan
mesh_terms: D000975:Antioxidants / Q000032:analysis / Q000737:chemistry* / Q000191:economics; D002140:California; D003080:Cold Temperature / Q000009:adverse effects; D019587:Dietary Supplements / Q000032:analysis* / Q000191:economics; D004610:Ellagic Acid / Q000032:analysis / Q000737:chemistry / Q000191:economics; D061353:Food Storage; D005525:Food-Processing Industry / Q000191:economics; D005638:Fruit / Q000737:chemistry*; D005707:Gallic Acid / Q000032:analysis / Q000737:chemistry / Q000191:economics; D006358:Hot Temperature / Q000009:adverse effects; D047348:Hydrolyzable Tannins / Q000032:analysis / Q000737:chemistry / Q000191:economics; D007220:Industrial Waste / Q000032:analysis* / Q000191:economics; D029561:Lythraceae / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry* / Q000191:economics; D011786:Quality Control; D012995:Solubility; D013237:Stereoisomerism; D013242:Sterilization; D013499:Surface Properties
chemical_list: D000975:Antioxidants; D047348:Hydrolyzable Tannins; D007220:Industrial Waste; D010936:Plant Extracts; D004610:Ellagic Acid; D005707:Gallic Acid; C115642:punicalagin
keywords: antioxidants; phenolics; pomegranate peel extracts; sterilization stability; storage stability