Ultrasound treatment (low frequency) effects on probiotic bacteria growth in fermented milk

  • Alaa Niamah University of Basrah

Abstract

The effect of ultrasonic treatment at 40 kHz for 0, 5, 10, 15 and 20 minutes on the growth of five different strains of probiotic bacteria (Lactobacillus acidophilus LA-5, Lactobacillus casei LC, Lactobacillus reuteri LR-MM53, Bifidobacterium bifidum Bb-12 and Bifidobacterium loungm BB-536) in fermented milk was investigated. The study findings indicate that ultrasound treatment (10 minutes) increased the viable cells and total acidity for LA-5, LC and LR-MM53 samples but decreased viable cells and total acidity in the Bb-12 and BB-536 samples. All probiotic bacteria strains were ruptured by ultrasound treatment causing an increase in the extracellular release of β-galactosidase enzyme. Increased exposure time led to higher enzymatic activity. 2.9 unit/ml of β-galactosidase was measured in LR-MM53 after ultrasonic treatment for 20 minutes. The fermentation time of LA-5, LC and LR-MM53 samples were reduced after 10 minutes of ultrasound treatment compared with the control sample. Added 5 percent (10⁸ CFU/ml) of probiotic bacteria led to reduce at the fermentation time during ultrasonic treatment compared with control sample. The optimal time span of ultrasound treatment (40 kHz, 116 W) was 10 minutes for all fermented milk samples, which can be applied to increase the number of viable cells of probiotic bacteria and β-galactosidase enzyme.

Keywords: Probiotic bacteria, Ultrasound, Fermented milk, β-galactosida

Data of the article

First received: 26 July 2018 | Last revision received: 27 March 2019
Accepted: 20 May 2019 | Published online: 04 September 2019
DOI:10.17170/kobra-20190709592

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Published
2019-09-04
How to Cite
Niamah, A. (2019). Ultrasound treatment (low frequency) effects on probiotic bacteria growth in fermented milk. Future of Food: Journal on Food, Agriculture and Society, 7(2/3), 103. Retrieved from http://www.fofj.org/index.php/FOFJ/article/view/172
Section
Research Articles