Impact of thermosonication on kiwi juice quality

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Abstract

Traditional heat treatments such as pasteurization are usually used in fruit juice preservation. However, due to undesirable quality changes, industries seek other processing technologies that can retain the fruit juices' quality. This study aims to develop a high quality and safe-to-drink kiwi (Actinidia deliciosa cv. Hayward) juice throughout the application of thermosonication treatments (TS). Listeria innocua (a surrogate of the pathogenic L. monocytogenes) was used as a safety indicator. pH, SSC, colour, cloud value, total phenolics, total chlorophylls, and minerals were evaluated as quality parameters. TS was carried out with an ultrasound homogenizer at a constant frequency of 20 kHz, 80% amplitude and discontinued pulsation (10s on, 5s off). The juice samples were submitted to TS at 45, 50 and 55°C for 15, 10 and 3 minutes, respectively. Thermal treatments (HT) were performed at the same temperatures for 60, 25 and 10 minutes. Juices' quality and safety were evaluated before and after treatments. All the treatments fulfil the FDA recommendation of 5-log microbial reduction. Most of the quality parameters were retained after both processes. These results proved that a mild heat process could be applied to fruit juices, allowing the obtention of a safe and improved final product's quality.
Original languageEnglish
Number of pages1
Publication statusPublished - Nov 2022
Event21st World Congress of Food Science & Technology : Future of Food: Innovation, Sustainability & Health - Marina Bay Sands Expo & Convention Centre, Singapore
Duration: 31 Oct 20223 Nov 2022
Conference number: 21

Conference

Conference21st World Congress of Food Science & Technology
Abbreviated titleIUFoST 2022
Country/TerritorySingapore
Period31/10/223/11/22

Keywords

  • Thermosonication
  • Kiwifruit juice
  • Thermal treatment
  • Quality
  • L. innocua

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