The Effect of the Contaminated Starter with Yeast on the Quality of the Kurdish Fermented Milk (Mast)


  • Anwar H.L Ali College of Agriculture, University of Sulaimani, Kurdistan Region, Iraq. Author
  • Stara Kader College of Agriculture, University of Sulaimani, Kurdistan Region, Iraq. Author
  • Hayder M. Hamzah College of Science, University of Sulaimani, Kurdistan Region, Iraq. Author



Fermented milk, Heat treatment, Lactic acid bacteria, Yeast


Mast is the type of set yoghurt manufactured in Kurdistan, it is firm fermented milk, characterized by yeasty, sharpen acidity and fir m consistency. Applying the same traditional method by using local mast in the Sulaimani city as starter which contains lactic acid bacteria with contaminated yeasts. The starters were divided into four parts, the first one was the control and the other three parts were treated with heat in water bath for (60°C/10 minute, 65°C/10 minute and 65°C/20 minute) respectively. The experiment reported that the control (untreated starter) have the highest yeast cells count (100%), and the starter treated with 65°C/20 minute have the lowest yeast cells count ( 0.3%). The starter treated with 65°C for 10 and 20 minute produces best mast quality according to the sensory test in comparison with other treatments.


- Venizelou, M., Kehagias, C., Samona, A. and Koulouris, S.. Survival of yoghurt characteristic Microorganisms in fruit yoghurts prepared under various conditions. Egyptian J. Dairy Sci. 2000, 28: 169-182.

- Ibrahim, F.S., Darwish, A.M. and Zahran, A.S. Chemical and microbiological studies on Yoghurt “Zabadi” manufactured in ElMinuteuteia province. 4th Egyptian conference for Dairy Science & Technology, . 1989,Cairo 4-6 Nov.

- Abo-Donia, S.A., Attia, L.A., Khattab, A.A and El-Khadragy, S.M. Characteristics of labneh manufactured using different lactic acid starter cultures. Egyptian Journal of Food Science, 1992a,,20: 1.

- Akin, N. and Rice, P. Main yoghurt and related products in Turkey. Cultured dairy products Journal, 1994, 29 (3): 23.

- Association of Official Analytical Chemists (AOAC). 1970. Official methods of analysis. George Banta Comp., INC, Nebraska, Wisconsin.

- Mclandsborough, L. A.. “Food Microbiology Laboratory. CRC press. Baca Raton”, 2005, London, New York, Washington, D.C..

- Tamime, A.Y. and Robinson, R.K. “Yoghurt: Science and Technology. Woodhead” 1999, publishing Ltd. Cambridge, England. Second Edition,.

- Abou-Donia, S.A.. Egyptian fresh fermented milk products. NewZealand J. Dairy Sci. and Techn., 1984, 19: 7.

- Mehanna, A.S. and Hefnawy, S.A.. A study to follow the chemical changes during processing and storage of Zabady; Egyptian Journal of Dairy Science, 1990,18: 425.

- Aly, S., Ouattara, C.A.T., Savadogo, P.W., Ouattara, N.B. and Traore, A.S. Microorganisms involved in Fulani traditional fermented milk in Burkina Faso., Pakistan Journal of Nutrition, 2004, 3 (2): 134-139. DOI:

- Hosono, A.R. and Otani, H.. Microbial flora in Dadih, traditional fermented milk in:Indonesia. Lebensm Wiss Tec., 1989, 22: 20-24.

- Beukes, E.M., Bester, B. H. and Mostert, J. F.. The microbiology of South Africa traditional fermented milk, Int. J. Food Microbiol., 2001, 63: 189–197. DOI:

- Soomro, A. H., Masud, T. and Anwaar, K.. Role of lactic acid bacteria (LAB) in food preservation and Human health., Pak. J. Nutr., 2002, 1:20-24. DOI:

- International Dairy Federation. General standard of identity for fermented milks.

Standard 163, IDF, Brussels, Belgium. 1992.



How to Cite

The Effect of the Contaminated Starter with Yeast on the Quality of the Kurdish Fermented Milk (Mast). (2008). Journal of Zankoy Sulaimani - Part A, 12(1), 23-28.

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