Quality Evaluation of Stirred Yoghurt Flavoured with Guddaim (<i>Grewia tenax</i>) Fruit
Keywords:
Keywords-- Chemical, fruit puree, Guddaim, microbiological, sensoryAbstract
This investigation was conducted to evaluate the quality of stirred yoghurt manufactured with Guddaim fruit. Cow milk was filtered and Guar gum was added as a stabilizer (2% w/v), followed by pasteurizing the mixture at 90ºC for15 min. After inoculation with 3% (w/v) of Lactobacillus bulgaricus and Streptococcus thermophilus, incubation was carried out at 45 ºC for 3 hr, followed by breaking the curd and addition of fruit puree [5% v/v (T1), 7% v/v (T2) and 10% v/v (T3)], in addition to plain yoghurt (T)). Yoghurt was stored at 4 ºC for 10 days and chemical, microbiological and sensory characteristics were carried out at 1, 3, 7 and 10-day intervals. Results indicated that addition of Guddaim did not increase the physic-chemical properties of yoghurt in comparison to control. During the storage period the fat and TA increased while protein and TS contents fluctuated and the ash content decreased to a minimum at day 3 then increased thereafter. TVB and Staphylococcus aureus counts were high in control, while coliform bacteria count was high in T1 and yeasts and moulds count was high in T2. During the storage period, TVB and yeasts and moulds counts increased while coliform bacteria and S. aureus counts fluctuated. The colour, consistency, taste and overall acceptability were best in control as judged by the panelists, while T1 scored best in flavour. All sensory characteristics deteriorated during storage period.References
Adolfsson, O., Meydani, S.N. and Ru, R.M. (2004). Yogurt and gut function. American Journal of Clinical Nutrition 80: 245–256. http://ajcn.nutrition.org/content/80/2/245.full
Aly, A.S., Galal, E.A. and Elewa, A. N. (2004). Carrot yoghurt: sensory, chemical, microbiological properties and consumer acceptance. Pakistan Journal of Nutrition 3 (6): 322-330. http://www.pjbs.org/pjnonline/fin235.pdf
Andronoiu, D.G., Botez, E., Mocanu, G.D., Nistor, O. and Nichiforescu, A. (2011). Technological research on obtaining a new product: yoghurt with added walnuts and strawberries jam. Journal of Agroalimentary Processes and Technologies 17(4): 452-455. . http://journal-of-agroalimentary.ro/admin/articole/1699L21_Andronoiu_2_Vol.17_4__452-455.pdf
AOAC (2000). Official Methods of Analysis of AOAC International, 17 ed., th AOAC International, Gaitherburg, MD, USA, Official Methods, 920.124, 926.08, 955.30, 2001.14.
Ayar, A., Sert, D., Kalyoncu, I.H. and Yazic, F. (2006). Physical, chemical, nutritional and organoleptic characteristics of fruit added yoghurts. Journal of Food Technology 4(1): 44-49. http://docsdrive.com/pdfs/medwelljournals/jftech/2006/44-49.pdf
Barrow, G.I. and Feltham, R.K.A. (1993). Cowan and Steel Manual for the Identification of Medical Bacteria, 3rd Edn., London, Cambridge University Press.
Belickova, E., Tkacikova, L., Naas, H.T., Vargova, M., Ondrasovic, M., Ondrasovicova, O., Obsitnikova, D. and Toth, L. (2001). Staphylococci plate counts in foods of milk origin. Vet. Med.-Czeck 46(1): 24-27. http://vri.cz/docs/vetmed/46-1-24.pdf
Christen, L.G., Davidson, P.M., McAllister, J.S. and Roth, L. A. (1992). Coliform and Other Indicator Bacteria. In: Marshal, R.T., (Ed.), Standard Methods for the Examination of Dairy Products, 16th E dn., American Public Health Association, Washington, DC, USA, pp: 247-269.
Cinbas, A. and Yazici, F. (2008). Effect of the addition of blueberries on selected physicochemical and sensory properties of yoghurts. Food Technology and Biotechnology 46 (4): 434–441. http://www.ftb.com.hr/images/pdfarticles/2008/Ocotober-December/46-434.pdf
Dlamini, A.M.;,Mamba, R. and Silaula, S.M. (2009). Attributes and consumer acceptance of yoghurt flavoured with non-cultivated indigenous Swazi fruits. African Journal of Food, Agriculture, Nutrition and Development 9(1): 636-651. http://www.ajfand.net/Volume9/No1/Dlamini2230.pdf
Flowers, S.R., Andrews, W., Donnelly, C.W. and Koenig, E.K. (1992). Pathogens in Milk and Milk Products. In Standard Methods for the Examination of Dairy Products, 16th edition, Ed., R.T. Marshal. Washington, DC: American Public Health Association, pp: 103-212.
Foda, M. I., Abd El-Aziz, M. and Awad, A.A. (2007). Chemical, rheological and sensory evaluation of yoghurt supplemented with turmeric. International Journal of Dairy Science 2(3): 252-259. http://scialert.net/qredirect.php?doi=ijds.2007.252.259&linkid=pdf
Frank, F.J., Christen, L.G. and Bullerman, L.B. (1992). Tests for Groups of Microorganisms. In: Marshal, R.T., (Ed.), Standard Methods for the Examination of Dairy Products. 16th Edn., American Public Health Association, Washington, D C, USA, pp: 271-286.
Gebauer, J., El-Sidding, K., El Tahir, B.A., Salih, A.A,; Ebert, G. and Hammer, K. (2007). Exploiting the potential of indigenous fruit trees: Grewia tenax (Forssk.) Fiori in Sudan. Genetic Resources and Crop Evolution 54: 1701-1708.
Houghtby, A.G., Maturin, L.J. and Koenig, K.E. (1992). Microbiological count methods. In Standard Methods for the Examination of Dairy Products. 6th Edn., Ed., R.T. Marshal. Washington, DC: American Public Health Association, pp: 213-246.
Iwalokun, B.A. and Shittu, M.O. (2007). Effect of Hibiscus Sabdariffa (Calyce) extract on biochemical and organoleptic properties of yogurt. Pakistan Journal of Nutrition 6 (2): 172-182. http://pjbs.org/pjnonline/fin418.pdf
Küҫüköner, E. and Tarakҫi, Z. (2003). Influence of different fruit additives on some properties of stirred yoghurt during storage. Tarım Bilimleri Dergisi (J. Agric. Sci.) 13(2): 97-101. http://tarimdergisi.yyu.edu.tr/say13(2)pdfler/97-101.pdf
Mbaeyi, I.E. and Anyanwu, L.N. (2010). Production and evaluation of yoghurt flavoured with solar-dried bush mango (Irvingia gabonensis) pulp. Agro-Science Journal of Tropical Agriculture, Food, Environment and Extension 9(2): 137-146. http://www.agrosciencejournal.com/public/agro9o2-10.pdf
Mohammed Elhassan ,G. O. and Yagi, S.M. (2010). Nutritional composition of Grewia species (Grewia tenax (Forsk.) Fiori, G. flavescens and G. villosa Willd) fruits. Advance Journal of Food Science and Technology 2(3): 159-162. http://maxwellsci.com/print/ajfst/v2-159-162.pdf
Okoye, J.I. and Animalu, I.L. (2009). Evaluation of physico-chemical and microbiological properties of stirred yoghurt stabilized with sweet potato (Ipomoea batatas) starch. Continental Journal of Microbiology 3: 27-30. http://www.wiloludjournal.com/pdf/micbio/2009/27-30.pdf
Tarakci, Z. (2010). Influence of Kiwi marmalade on the rheology characteristics, color values and sensorial acceptability of fruit yoghurt. Kafkas Univ. Vet. Fak. Derg. 16(2): 173-178. http://vetdergi.kafkas.edu.tr/extdocs/2010_2/173_178.pdf
Tarakci, Z. and Kucukoner, E. (2003). Physical, chemical, microbiological and sensory characteristics of some fruit-flavored yoghurt. YYU Vet. Fak. Derg. 14(2): 10-14.
Trachoo, N. (2002). Yoghurt: the fermented milk. Songklanakarin Journal of Science and Technology 24(4): 727-738.
Vahedi, N., Tehrani, M.M. and Shahid, F. (2008). Optimizing of fruit yoghurt formulation and evaluating its quality during storage. American-Eurasian Journal of Agriculture and Environmental Scie
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