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Comparison of the Keeping Quality of UHT Pasteurized Milks in Korea  

Chung, Chung-Il (Department of Dairy Science, Kon-kuk University)
Kim, Kwag-Tae (Department of Dairy Science, Kon-kuk University)
Cho, Nam-Yong (Quality Assurance team, Kon-kuk University Dairy)
Jung, Min-Jung (Quality Assurance team, Kon-kuk University Dairy)
Oh, Hyun-Suk (Department of Dairy Science, Kon-kuk University)
Lee, Gil (Department of Dairy Science, Kon-kuk University)
Publication Information
Food Science of Animal Resources / v.22, no.3, 2002 , pp. 247-251 More about this Journal
Abstract
This study was carried out to investigate the keeping quality of market milks collected from several dairy processing companies. Microbiological, chemical, and sensory properties of Intra-high temperature(UHT) treated milks stored at 5, 10, 15t were evaluated during the storage of 154days. No significant difference during the storage was shown in bacterial counts, pH and titratable acidity. Standard plate count(SPC) was remained less than 20,000 cfu/ml after 15 day storage at 5, 10, 15$^{\circ}C$. Also, Psychrotrophic bacterial count and Coliform count were not detected or detected at low level. The pH ranged from 6.55 to 6.83 and the titratable acidity ranged from 0.13% to 0.16%. In sensory evaluation, UHT milks showed normal flavor until 10days, but thereafter off-flavor was slightly developed. Consequently, UHT milks remained in good quality when stored at 5$^{\circ}C$,10$^{\circ}C$t until 15days except sensory properties. According to this experiment, the shelf-life of UHT milk can be extended to 10 days, even though maintaining the storage temperature strictly below 10 t in milk market is not easy.
Keywords
UHT milk; shelf-life; keeping quality;
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  • Reference
1 Burton, H. (1959) The sulphydryl groups in milk measured by an amperometric titration. International Dairy Congr. 3:1729-1734
2 Kang, I. S., Lee, J. H. and Lee, S. W. (1995) A comparative study on the quality of pasteurized milk in Korea. Korean J. Dairy Sci., 17(2):161-166
3 McMeekin, T. A. and Ross, T. (1996) Shelf life prediction : status and future possibilities. Inter. J. Food Microbiol., 33:65-83   DOI   ScienceOn
4 Park, Y. H. (1993) SYMPOSIUM : Investigation and Improvement of Raw Milk Quality. Korean J. Food Hygiene and Safety, 8(2): 33-39
5 Stepaniak, L., Zakrzewski, E. and Sorhung, T. (1991) Inactivation of heat-stable proteniase from Pseudomonas fluorescens Pl at pH4.5 & $55^{\circ}C$. Milchwissenshaft, 146(3):139-142
6 Kang, D. H. (1993) 원유 위생관리제도 개선. 유가공연구회지.10(2):82-86
7 Association of Official Analytical Chemist. (1990) Offcial methods of analysis, 15th ed. Association of Official chemist. Washington, D. C
8 Lee, S. W. and Hwangbo, S. (2001) Changes on the quality of market milk on the storage conditions. Korean J. Food Sci. Ani Resour., 21(2):156-162
9 Yoon, Y. C., Lee, J. M. and Kim, N. W. (1990) Studies on the changes of physicochemical quality in UHT-treated market milk during storage. Korean. J. Dairy Sci., 12(1):82-86
10 Vallejo-Cordoba, B. and Nakai, S. (1994) Keeping quality assess-ment of pasteurized milk by multivariate analysis of dynamic head-space gas chromatographic data. 1. Shelf life prediction by principal componet regression. J. Agric. Food Chem., 41. 2378-2382   DOI   ScienceOn
11 Kim, G. S., Lim, S. D., Kim, H. S., Lee, C., Chung, S. H. and Park, M. H. (1993) 집유검사 및 유대지급제도 개선방향. 유가공연구회지, 10(2):71-81   과학기술학회마을
12 Kwon, W. H. and Choi, S. H. (1998) Changes in bacterial count, shelf life and soluble whey protein content of market milk by heat treatment process and storage temperature. Korean J. Dairy Sci., 20(2): 133-142
13 Chung, C. I. (1987) Biochemical changes of milk quality by various heat treatments. Korean Dairy Technol., 5(1):24-31
14 Kwon, S. H., Ahn, J. J. and Kwak, H. S. (1998) Quality changes in various heat-treated market milks during storage. Korean Dairy Techno., 16(2):90-97
15 Hansen, A. P. (1987) Effect of ultra-high-temperature processing and storage on dairy food flavor. Food Technol., 9
16 Smith, T. L., Mull, L. E., Lane, C. B. and Baggott, A. J. (1972) Keeping quality of milk exposed to high temperature as ex-perienced during transport on automobiles. J. Milk Food Technol., 35:588-594   DOI