Publication: Polietilen Tereftalat Esaslı Plastik Ambalajın Ozon İle Dezenfeksiyonu
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Bu tez çalışmasında, gıda endüstrisinde kullanılan ve sıcaklıkla sterilize edilemeyen polietilen tereftalat (PET) malzemeden üretilen plastik ambalaj materyallerinin dezenfeksiyonunda yeni bir yaklaşımla gaz formunda ozon kullanımının etkinliği araştırılarak endüstriyel olarak uygulanabilir bir yöntem belirlenmesi hedeflenmiştir. Bu amaçla indikatör olarak seçilen Escherichia coli, Bacillus cereus, Candida albicans ve Aspergillus flavus suşları 4 farklı sürede (5, 15, 30 ve 60 dakika) gaz ozon uygulamasına maruz tutulmuştur. Örneklerin başlangıç ve ozonlama sonrası sayım sonuçlarından canlı hücre sayısındaki azalış logaritmik ve % olarak hesaplanmıştır. E. coli, B. cereus, C. albicans ve A. flavus canlı hücre sayılarının ozonlama süresine bağlı olarak düzenli bir azalış gösterdiği ve 60 dakika ozonlama süreleri sonunda canlı hücre sayısındaki logaritmik azalışın sırasıyla 7,10 log KOB/mL, 2,73 log KOB/mL, 4,89 log KOB/mL ve 2,98 log KOB/mL değerlerine ulaştığı belirlenmiştir. Ozonlamanın tüm mikroorganizmaların canlı hücre sayısındaki azalış üzerine etkisi istatistiksel olarak anlamlı (P < 0,01) bulunmuştur. Bu verilere göre plastik ambalaj materyallerinin gaz ozon ile dezenfekte edilebileceği söylenebilmektedir. Anahtar Kelimeler: Ozon; Plastik Ambalaj; Polietilen Tereftalat; Dezenfeksiyon; Gıda Endüstrisi.
In this study, disinfection of plastic packaging materials produced from polyethylene terephthalate (PET) using in the food industry that can not be sterilized with temperature is investigated effectiveness of using gaseous ozone with a new approach aimed to determine industrially applicable method. For this purpose, selected as indicator Escherichia coli, Bacillus cereus, Candida albicans and Aspergillus flavus strains were exposed to the application of ozone gas in four different times (5, 15, 30 and 60 minutes). The decrease in the number of viable cells was calculated as logarithmic and % from the results of the initial sample and after ozonation count results. Depending ozonation time, the number of viable cells of E. coli, B. cereus, C. albicans and A. flavus was determined that a steady decline and at the end of 60 minutes ozonation time the logarithmic decline in the number of viable cells was got 7.10 log CFU / mL, 2.73 log CFU/mL, 4.89 log CFU/mL and 2.98 log CFU/mL value, respectively. Ozonation influence on the decrease in the number of viable cells of all organisms were found to be statistically significant (P<0.01). According to this data, it can be said that the plastic packaging materials will be able to disinfected with ozone gas. Key Words: Ozone; Plastic Packaging; Polyethylene Terephthalate; Disinfection; Food Industry.
In this study, disinfection of plastic packaging materials produced from polyethylene terephthalate (PET) using in the food industry that can not be sterilized with temperature is investigated effectiveness of using gaseous ozone with a new approach aimed to determine industrially applicable method. For this purpose, selected as indicator Escherichia coli, Bacillus cereus, Candida albicans and Aspergillus flavus strains were exposed to the application of ozone gas in four different times (5, 15, 30 and 60 minutes). The decrease in the number of viable cells was calculated as logarithmic and % from the results of the initial sample and after ozonation count results. Depending ozonation time, the number of viable cells of E. coli, B. cereus, C. albicans and A. flavus was determined that a steady decline and at the end of 60 minutes ozonation time the logarithmic decline in the number of viable cells was got 7.10 log CFU / mL, 2.73 log CFU/mL, 4.89 log CFU/mL and 2.98 log CFU/mL value, respectively. Ozonation influence on the decrease in the number of viable cells of all organisms were found to be statistically significant (P<0.01). According to this data, it can be said that the plastic packaging materials will be able to disinfected with ozone gas. Key Words: Ozone; Plastic Packaging; Polyethylene Terephthalate; Disinfection; Food Industry.
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Tez (yüksek lisans) -- Ondokuz Mayıs Üniversitesi, 2016
Libra Kayıt No: 90293
Libra Kayıt No: 90293
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