High-Intensity Ultrasound Processing of Pineapple Juice
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The influence of ultrasound processing on the physicochemical characteristics of pineapple juice was investigated through an experimental design changing ultrasound time and intensity. After processing, the polyphenoloxidase (PPO) activity in the pineapple juice was reduced by 20% as result of the treatment with longer exposure and higher intensity (376 W/cm2 and 10 min). The effect on phenolic compounds compared to the fresh pineapple juice (non-sonicated) was not statistically significant. Ultrasound processing reduced juice viscosity by 75% of the initial value (non-sonicated juice). The higher the ultrasound intensity and the juice exposure (processing time), the higher the final temperature of the juice, reaching a maximum of 54 °C. Ultrasound processing enhanced the juice color and its stabilization along 42 days of storage compared to the non-sonicated juice. Thermal treatment at the highest temperature reached due to juice sonication (54 °C) showed no effect on PPO inactivation.
KeywordsHigh-intensity ultrasound Enzyme activity Phenolic compounds Viscosity Color stability
The authors thank CNPq for financial support through the National Institute of Science and Technology of Tropical Fruit and CAPES for scholarship.
- Ashokkumar, M., Sunartio, D., Kentish, S., Mawson, R., Simons, L., Vilkhu, K., & Versterrg, C. K. (2008). Modification of food ingredients by ultrasound to improve functionality: a preliminary study on a model system. Innovative Food Science and Emerging Technologies, 9, 155–160.CrossRefGoogle Scholar
- Bates, D. M., Bagnall, W. A., & Bridges, M. W. (2006). Method of treatment of vegetable matter with ultrasonic energy. US patent application 20060110503.Google Scholar
- Botelho, L., Conceição, A., & Carvalho, V. D. (2002). Caracterização de fibras alimentares da casca e cilindro central do abacaxi ‘Smooth Cayenne’. Ciência agrotecnologia, 26, 362–367.Google Scholar
- Bradford, M. M. A. (1976). Rapid and sensitive method for the quantization of microgram quantities of protein utilizing the principle of protein–dye binding. Analytical Chemistry, 72, 248–254.Google Scholar
- Fonteles, T. V., de Costa, M. G., Jesus, A. L. T., & Rodrigues, S. (2011). Optimization of the fermentation of cantaloupe juice by Lactobacillus casei NRRL B-442. Food and Bioprocess Technology. doi: 10.1007/s11947-011-0600-0.
- Kuldiloke, J. (2002). Effect of ultrasound, temperature and pressure treatments on enzyme activity and quality indicators of fruit and vegetable juices. Doctoral dissertation, Technical University of Berlin, Berlin.Google Scholar
- Minolta. (1998). Precise color communication—color control from perception to instrumentation (p. 59). Osaka: Minolta.Google Scholar
- Sun, D. W. (2005). Emerging technologies for food processing. London: Elsevier.Google Scholar
- Suslick, K. S. (1988). Ultrasounds: Its chemical physical and biological effects. New York: VHC.Google Scholar
- Wambura, P., Tegete, H., & Verghese, M. (2010). Application of high-power ultrasound to improve adhesion of honey on roasted peanuts to improve oxidative stability. Food and Bioprocess Technology. doi: 10.1007/s11947-010-0467-5.
- Wissemann, K. W., & Lee, C. Y. (1980). Polyphenoloxidase activity during grape maturation and wine production. American Journal of Enology and Viticulture, 31, 206–211.Google Scholar
- Zenker, M., Heinz, V., & Knorr, D. (2003). Application of ultrasound-assisted thermal processing for preservation and quality retention of liquid foods. Journal of Food Protection, 66, 1642–1649.Google Scholar