Effects of high pressure processing on changes of bioactive compounds in honeydew melon juice and honeydew melon juice milk

• Author / Creator

  Du, Jin

• Honeydew melon is a rich source of bioactive compounds, such as vitamin C and group B vitamins while milk is a rich source of vitamin E. The objective of this thesis is to investigate the changes of quality attributes and bioactive compounds in honeydew melon juice and melon milk using High Pressure Processing (HPP) treatments of 300-600 MPa/20 and 60 ºC/5 min. The total phenolics and total flavonoids content were analyzed by spectrometry. The retention of vitamin C, B3, folic acid and α-tocopherol were quantified using high performance liquid chromatography (HPLC). The total antioxidant capacity was determined by 2,2-Diphenyl-1-pic-ryl-hydrazyl (DPPH) inhibition assay and ferric reducing antioxidant power (FRAP) assay. Overall, HPP treatments had different effects on melon juice and melon milk matrices. In melon juice, significant increases of vitamin C content, color parameters of greenness and lightness were observed, indicating an extraction effect of HPP. Folic acid was well retained by protection of vitamin C. Niacin showed variable results at different pressures. A decrease of total flavonoids content was found after HPP at 20 °C. In honeydew melon milk (semi-skim), HPP treatments decreased total phenolics content and total flavonoids content. And no significant effects were found in the retention of ascorbic acid, niacin, α-tocopherol and total antioxidant capacity. In honeydew melon milk (whole), significant increases were found in total phenolics content, ascorbic acid and α-tocopherol. Based on the positive effects of HPP on the quality attributes and most bioactive compounds contents of honeydew melon juice and melon milk (whole) and the minor effects of HPP on bioactive compounds contents of melon milk (semi-skim),, HPP seems a promising technology for honeydew melon juice and melon milk (whole) beverages.

• Subjects / Keywords

  • High Pressure Processing
  • honeydew melon juice
  • juice milk
  • bioactive compounds
  • antioxidant capacity

• Graduation date

  Spring 2016

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/R3T43JD4R

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.