Volume 10, Issue 38 (2013)                   FSCT 2013, 10(38): 45-48 | Back to browse issues page

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Necessity of pasteurized milk freezing point revision in its Iranian standard ( ISIRI 93) to improve dairy product safety. FSCT 2013; 10 (38) :45-48
URL: http://fsct.modares.ac.ir/article-7-9627-en.html
Abstract:   (8922 Views)
  Introduction: Pure water freezes at zero degrees of Celsius. By dissolving any material in the water its freezing point will be decreased, similar to water, some ingredients of milk such as lactose, ion Chlorides decreases the freezing point. The main factors affecting the freezing point of milk are: added water during milking and gathering, high microbial load, mastitis, adulteration including the addition of Ionizable materials for example salt and etc.  Objectives: To determine the average bovine milk freezing point, the percentage of none-fat-solid (SNF) and  elemental mineral content(EMC) at the same time. Materials and methods: This is a descriptive analytical study which was done in Kermanshah province by using 100 milk samples from complete milk of healthy cow in definite time point by simple random sampling. The samples transported to laboratory in less than 3 hours , freezing point of each sample has determinated by calibrated cryoscope , the percentage of SNF and EMC   has determinate  by calibrated  Milk  analyzer . Results: beyond standard conditions of milking, collection and immediate testing, results showed that mean freezing point of milk was -0.519,  mean SNF was 8.23 and  mean mineral percentage was 0.74.. Conclusion: Since the Institute of Standards and Industrial Research of Iran in the 4th revision of the pasteurized milk standard (Standard 93) has limited the percentage of SNF of milk to  8 and freezing point  to -0/507 to -0/545, which are not at the same line. Moreover, other factors such as EMC have underestimated, we suggest that the freezing point of milk without measuring EMC 
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Received: 2011/04/24 | Accepted: 2012/05/24 | Published: 2013/01/23

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