Department of Science Laboratory Technology, The Polytechnic, Ibadan, Nigeria, Department of Microbiology, College of Basic Sciences, CSK Himachal Pradesh Agriculrural University,Palampur, India 1
The effect of ethanolic extract of ginger (Zingiber officinale) on sensory and storage qualities of wara was evaluated. Pasteurized fresh milk samples were used to prepare wara and; 1.6%, 2.4%, 3.2% and 0% ginger extracts (samples A, B, C and D respectively) were incorporated into the samples separately. The wara samples were then fried in hot palm oil as it is done traditionally and organoleptic properties of the samples were determined by a taste panelist. Also physico-chemical and microbiological changes during six (6) days storage at ambient tropical temperature (30 ± 2oC) were determined. The samples (A, B and C) containing ginger were rated better than the control sample (D). Sample C had the highest overall acceptability of 4.0 while sample D had the least (2.8). During storage a significant decrease (P≤0.05) in pH with a corresponding increase in titratable acidity (TA) was recorded for the wara samples. The pH ranged between 4.17 and 6.55 while the TA ranged between 0.018 and 0.099 (mg/100g).The peroxide values (POV) of sample D increased at a faster rate than samples A, B and C. The POV for sample D after 3 days of storage was 34.15 meq/kg while that of sample C was 25.33 meq/kg at the end of 6 days storage. Although there was general increase in the microbial loads (MLs) of all the samples, the MLs of samples A, B and C were significantly lower than that of sample D. Moreover samples A and B got spoilt by day 4 of storage; sample D by day 3 while sample C was still in good condition at the end of 6 days storage. This study therefore showed that incorporation of 3.2% ethanolic ginger extract significantly improved acceptability of wara and increased the shelf life of the product by 3 days.
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Abd El-Aziz, M., S.H.S. Mohamed and F.L. Seleet, 2012. Production and evaluation of soft cheese fortified with ginger extract as a functional dairy food. Polish Journal of Food and Nutrition Science, 62(2): 77-83.
Achi, O. and P. Akubor, 2000. Microbiological characterization of yam fermentation for elubo (Yam Flour) production. World Journal of Microbiology and Biotechnology, 16(1): 3-7.
Adesokan, I., E. Avanrenren, R. Salami, I. Akinlosotu and O. Olayiwola, 2008. Management of spoilage and pathogenic organisms during the fermentation of nono – an indigenous fermented milk product in Nigeria. Journal of Applied Biosciences, 11: 564-569.
Adesokan, I., Y. Ekanola, S. Fakorede, O. Oladejo and O. Odutola, 2009. Influence of lactic staters on sensory properties and shelf life of wara- a Nigerian (Unripened) soft cheese. Journal of Applied Biosciences, 13: 714-719.
Ahn, J., I. Graun and A. Mustapha, 2007. Effects of plant extract on microbial growth, colour change and lipid oxidation in cooked beef. Food Microbiology, 24(1): 7-14.
AOAC, 1990. Official methods of analysis. 15th Edn., Washington D.C.: Association of Official Analytical Chemists. ISBN 0-93 558 442-0.
Aworh, O. and M. Egounlety, 1985. Preservation of West African soft cheese by chemical treatment. Journal of Dairy Research, 52(1): 189-195.
Azzouz, M. and L. Bullerman, 1982. Comparative antimycotic effects of selected herbs and spices, plant components and commercial antifungal agents. Journal of food Protection, 45: 1248–1301.
Belewu, M., K. Belewu and C. Nkwunono, 2005. Effects of biological and chemical preservations on the shelf-life of West African soft cheese. African Journal of Biotechnology, 14(10): 1076.
Binshan, Y., C. Zhong, D. John and H. Brooks, 2007. The in vitro antibacterial activity of dietary spice and medicinal herb extracts. International Journal of Food Microbiology, 117(1): 112–119.
Cowan, M., 1999. Plant products as antimicrobial agents. Clinical Microbiology Reviews, 12(): 564–582.
Cutler, H., 1995. Natural product flavor compounds - a potential antimicrobials, insecticides, and medicinals. Agro-Food-Industry Hi-Tech, 6: 19-23.
George, W., 2004. Spices and herbs for the home garden. Cooperative extension service, college of agriculture and home economics. New Mexico State University, Guide H. pp: 1 – 8.
Hara-kudo, Y., A. Kobayashi, Y. Sugita-Konishi and K. Kondo, 2004. Antibacterial activity of plants used in cooking for aroma and taste. Journal of Food Protection, 67: 2820–2824.
Jay, J. and G. River, 1984. Antimicrobial activity of some food flavouring compounds. Journal of food Safety, 6: 129–139.
Joseph, J. and F. Akinyosoye, 1997. Comparative studies on red sorghum extract and other chemicals as preservations for West African soft cheese. International Dairy Journal, 12: 193–198.
Kolapo, A., T. Popoola, M. Sanni and R. Afolabi, 2007. Preservation of soybean daddawa condiment with dichloromethane extract of ginger. Research Journal of Microbiology, 2(3): 254-259
Marija, M.S. and T.N. Nevena, 2009. Antimicrobial effects of spices and herbs essential oils. BIBLID, 40: 195-209.
Nout, M., 1991. Ecology of accelerated natural lactic fermentation of sorghum-based infant food formulas. International Journal of food Microbiology, 14: 217–224.
Pazakova, J., P. Turek and A. Lackakova, 1997. The survival of Staphylococcus aureus during the fermentation and storage of yoghurt. Journal of Applied Microbiology, 82: 659–662.
Pearson, D., 1981. The chemical analysis of food. 6th Edn., Churchill Livingstone Ediburgh. pp: 56.
Seaberg, A., R. Labbe and K. Shetty, 2003. Inhibition of Listeria monocytogenes by elite clonal extracts of oregano (Origanum Vulgare). Food Biotechnology, 17(2): 129–149.
Smith - Palmer, A., J. Stewart and L. Fyfe, 1998. Antimicrobial properties of plant essential oils against five important food-borne pathogens. Letters in Applied Microbiology, 26: 118–122.
Zia-Ur-Rehman, A. Salariya and F. Habib, 2003. Antioxidant activity of ginger extract in sunflower oil. Journal of the Science of Food and Agriculture, 83: 624-629.
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