Volume 13, Issue 51 (2016)                   FSCT 2016, 13(51): 149-157 | Back to browse issues page

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mohammadi V, Ebrahimi R, Ghasemi Varnam khasti M, Abbas Vali M, Lahimgar zadeh A. Detection of microbial contamination of UHT milk packages using ultrasonic system. FSCT 2016; 13 (51) :149-157
URL: http://fsct.modares.ac.ir/article-7-6085-en.html
Detection of microbial contamination of UHT milk packages using ultrasonic system
Vahid Mohammadi , Rahim Ebrahimi , Mahdi Ghasemi Varnam khasti , Maryam Abbas Vali , Ali Lahimgar zadeh
Abstract:   (5085 Views)
In current investigation a quality control ultrasonic system has been presented for detecting microbial contamination of UHT milk packages. This system is able to detect microbial contamination of milk packages without opening them. Microorganisms’ growth causes some changes in physical and chemical properties of milk resulting in changes of ultrasonic properties of milk. In this study amplitude and time of flight of ultrasonic waves were measured. The center frequency of piezoelectric discs was 1.02 MHz and all of experiments were done in temperature 35°C. Ultrasonic tests were conducted for microorganisms Escherichia coli, Staphylococcus aurous and Bacillus cereus. The results showed that different bacteria’s metabolisms affected chemical properties of milk and detecting process of microbial contamination. Ultrasonic system was able to detect microbial contamination after 7.25 to 12.5 h. from microbe injection. Also, the results showed that ultrasonic system can detect microbial contamination in various values of acidity and pH of milk packages.
Keywords: Ultrasound, Microbial contamination, Milk, Detection
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Received: 2014/05/13 | Accepted: 2015/03/14 | Published: 2016/02/20
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