Effect of Ultraviolet Light on Microbiological Properties of Milk (Turkish with English Abstract)

Abstract

The aim of this study was to investigate the effects of ultraviolet light treatment on microbiological quality of milk. For this purpose, cow milk samples, which were obtained from five different milk producers, were applied ultraviolet treatment (UV) and pasteurization. Total aerobic mesophilic bacteria, coliform, E. coli, mould-yeast, Streptococcus spp. and Lactobacillus spp. counts were determined in the samples. It was found that effects of treatments on these microorganisms in raw milk were significant. The UV treatment was as effective as pasteurization on total aerobic mesophilic bacteria and coliform and a significant reduction was achieved. However, it was found that UV treatment was less effective on mould-yeast and Streptococcus spp. in milk.

Keywords

• Milk, pasteurization, ultraviolet, microorganism　　

Ultraviyole Işınlarının Sütün Mikrobiyal Kalitesi Üzerine Etkisi

Abstract

Bu çalışmanın amacı ultraviyole uygulamasının sütün mikrobiyel kalitesine etkisinin araştırılmasıdır. Bu amaçla, 5 farklı süt üreticisinden elde edilen süt örneklerine pastörizasyon ve ultraviyole (UV) işlemi uygulanmıştır. Uygulama yapılan örneklerde toplam aerobik mezofilik bakteri, koliform, E. coli, maya-küf, Streptococcus spp. ve Lactobacillus spp. sayımları gerçekleştirilmiştir. Çalışma sonucunda, çiğ süte uygulanan işlemlerin söz konusu mikroorganizmalar üzerine etkileri önemli bulunmuştur. Süt örneklerinin toplam aerobik mezofilik bakteri ve koliform popülasyonu üzerine UV uygulamasının pastörizasyon işlemi kadar etkili olduğu ve önemli düzeyde redüksiyon sağladığı tespit edilmiştir. Ancak UV uygulamasının maya-küf ve Streptococcus spp. üzerine etkisinin daha düşük olduğu belirlenmiştir.

Keywords

• Süt, pastörizasyon, ultraviyole, mikroorganizma 　　

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