Muhammet ARICI, Nevruz Berna ERSÖZ TATLISU, Ömer Said TOKER, Mustafa Tahsin YILMAZ

Microbiological, steady, and dynamic rheological characterization of boza samples: temperature sweep tests and applicability of the Cox-Merz rule

Boza is a beverage produced by lactic acid bacteria (LAB) and yeast, which affects rheological properties. In the present study, boza samples collected from a local market were characterized with reference to microbiological and rheological approaches. The boza samples were characterized with respect to their microbiological population, i.e. the numbers of LAB and yeast. The numbers of LAB and yeast were found to range from 2.88 × 106 to 2.06 × 1010 CFU/mL and from 3.71 × 103 to 9.40 × 105 CFU/mL, respectively. Their steady and dynamic rheological properties were investigated within the temperature range of 0-50 °C. Apparent viscosity values (h) of the boza samples decreased with shear rate, indicating that the samples behaved as a pseudoplastic fluid. The Ostwald-de Waele model satisfactorily described (R2 > 0.99) the flow behavior of the samples at 5 and 20 °C. Storage modulus (G') values were higher than loss modulus (G''), indicating that boza samples had a solid-like structure. Temperature had a remarkable effect on the steady and dynamic properties of the samples; therefore, temperature sweep tests were also conducted to determine temperature dependency of the samples. The h50, G', and G'' values decreased with increase in temperature. The Arrhenius equation could be satisfactorily used to describe changes in these parameters depending on temperature. A modified Cox-Merz rule with shift factors ranging from 1.0 to 2.2 was successfully applied to put forward a relationship between steady shear and dynamic shear viscosity data.

Anahtar Kelimeler:

Key words: Arrhenius, boza, Cox-Merz rule, dynamic and steady shear, temperature sweep

Microbiological, steady, and dynamic rheological characterization of boza samples: temperature sweep tests and applicability of the Cox-Merz rule

Keywords:

Key words: Arrhenius, boza, Cox-Merz rule, dynamic and steady shear, temperature sweep,

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Ahmed Z, Wang Y, Anjum N, Ahmad A, Khan ST (2013). Characterization of exopolysaccharide produced by Lactobacillus keﬁranofaciens ZW3 isolated from Tibet keﬁrPart II. Food Hydrocolloid 30: 343–350.
Altay F, Karbancıoglu-Güler F, Daskaya-Dikmen C, Heperkan D (2013). A review on traditional Turkish fermented nonalcoholic beverages: microbiota, fermentation process and quality characteristics. Int J Food Microbiol 167: 44–56.
Alvarez MD, Fernández C, Canet W (2011). Effect of cryoprotectant mixtures on rheological properties of fresh and frozen/thawed mashed potatoes. J Food Process Eng 34: 224–250.
Arici M, Daglioglu O (2002). Boza: a lactic acid fermented cereal beverage as a traditional Turkish food. Food Res Int 18: 39–48.
Arslan E, Yener ME, Esin A (2005). Rheological characterization of tahin/pekmez (sesame paste/concentrated grape juice) blends. J Food Eng 69: 167–172.
Augusto PED, Falguera V, Cristianini M, Ibarz A (2013). Viscoelastic properties of tomato juice: applicability of the Cox–Merz rule. Food Bioprocess Tech 6: 839–843.
Bahnassey YA, Breene WM (1994). Rapid visco-analyzer (RVA) pasting profiles wheat, corn, waxy corn, tapioca and amaranth starches (A. hypochondriacs and A. cruentus) in the presence of konjac flour, gellan, guar, xanthan and locust bean gum. Starch 46: 134–141.
Blandino A, Al-Aseeri ME, Pandiella SS, Cantero D, Webb C (2003). Cereal based fermented foods and beverages. Food Res Int 36: 527–543.
Botes A, Todorov SD, von Mollendorff JW, Botha A, Dicks LMT (2007). Identification of lactic acid bacteria and yeast from boza. Process Biochem 42: 267–270.
Bourne MC (1982) Food Texture and Viscosity: Concept and Measurement. New York, NY, USA: Academic Press.
Bourne MC (2002). Physics and texture. In: Bourne MC, editor. Food Texture and Viscosity. London, UK: Academic Press, pp. 59–106.
Chun SY, Yoo B (2004). Rheological behavior of cooked rice flour dispersions in steady and dynamic shear. J Food Eng 65: 363– 3
Cox W, Merz E (1958). Correlation of dynamic and steady flow viscosities. J Polym Sci 28: 619–622.
Da Silva JAL, Rao M (1992). Viscoelastic properties of food hydrocolloid dispersions. In: Rao MA, Steffe JF, editors. Viscoelastic Properties of Foods. London, UK: Elsevier, pp. 285–315.
Deegan LH, Cotter PD, Hill C, Ross P (2006). Bacteriocins: biological tools for bio-preservation and shelf-life extension. Int Dairy J 16: 1058–1071.
De Vuyst L, Vandamme EJ (1994). Bacteriocins of Lactic Acid Bacteria: Microbiology, Genetics and Applications. London, UK: Blackie Academic and Professional.
Dimitreli G, Thomareis AS (2008). Effect of chemical composition on the linear viscoelastic properties of spreadable-type processed cheese. J Food Eng 84: 368–374.
Dogan M, Kayacier A, Toker OS, Yilmaz MT, Karaman S (2012). Steady, dynamic, creep and recovery analysis of ice-cream mixes added with different concentrations of xanthan gum. Food Bioprocess Tech 6: 1420–1433.
Dogan M, Toker OS, Aktar T, Goksel M (2012). Optimization of gum combination in prebiotic instant hot chocolate beverage model system in terms of rheological aspect: Mixture design approach. Food Bioprocess Tech 6: 783–794.
Dogan M, Toker OS, Goksel M (2011). Rheological behaviour of instant hot chocolate beverage: Part 1. Optimization of the effect of different starches and gums. Food Biophys 6: 512–518.
Fischer P, Windham EJ (2011). Rheology of food materials. Curr Opin Colloid In 16: 36–40.
Genc M, Zorba M, Ova G (2002). Determination of rheological properties of boza by using physical and sensory analysis. J Food Eng 52: 95–98.
Goksel M, Dogan M, Toker OS, Ozgen S, Sarioglu K, Oral RA (2012). The effect of starch concentration and temperature on grape molasses: rheological and textural properties. Food Bioprocess Tech 6: 259–271.
Gotcheva V, Pandiella SS, Angelov A, RoshkovaZG, Webb C (2000). Microﬂora identiﬁcation of the Bulgarian cereal-based fermented beverage boza. Process Biochem 36: 127–130.
Gunasekaran S, Ak MM (2000). Dynamic oscillatory shear testing of foods selected applications. Trends Food Sci Tech 11: 115–127.
Hancioglu O, Karapinar M (1997). Microﬂora of boza, a traditional fermented Turkish beverage. Int J Food Microbiol 35: 271–274.
Hassan BH, Hobani AI (1998). Flow properties of roselle (Hibiscus sabdariffa L.) extract. J Food Eng 35: 459–470.
Hayta M, Alpaslan M, Kose E (2001). The effect of fermentation on viscosity and protein solubility of boza a traditional cereal based fermented Turkish beverage. Eur Food Res Technol 213: 335–337.
Holdsworth SD (1971). Applicability of rheological models to the interpretation of flow and processing behaviour of fluid food products. J Texture Stud 2: 393–418.
Ibanoglu S, Ibanoglu E (1998). Rheological characterization of some traditional Turkish soups. J Food Eng 35: 251–256.
Ivanova I, Kabadjova P, Pantev A, Danova S, Dousset X (2000). Detection, purification and partial characterization of a novel bacteriocin substance produced by Lactococcus lactis subsp. lactis B14 isolated from boza – Bulgarian traditional cereal beverage. Biocatalysis 41: 47–53.
Juszczak L, Witczak M, Fortuna T, Banys A (2004). Rheological properties of commercial mustards. J Food Eng 63: 209–217.
Karaman S, Yilmaz MT, Cankurt H, Kayacier A, Sagdic O (2012). Linear creep and recovery analysis of ketchup-processed cheese mixtures using mechanical simulation models as a function of temperature and concentration. Food Res Int 48: 507–519.
Karaman S, Yilmaz MT, Dogan M, Yetim H, Kayacier A (2011). Dynamic oscillatory shear properties of O/W model system meat emulsions: linear viscoelastic analysis for effect of temperature and oil concentration on protein network formation. J Food Eng 107: 241–252.
Kim C, Yoo B (2006). Rheological properties of rice starch–xanthan gum mixtures. J Food Eng 72:120–128.
Kocabaş N, Karapınar M (1993). Kuru incir fungal florasının saptanmasında farklı besiyeri ve besiyeri dökme sıcaklığının etkisi. Doğa-Türk Tarım Ormancılık Dergisi 17: 205–211 (article in Turkish).
Leroy F, De Vuyst L (2004). Lactic acid bacteria as functional starter cultures for the food fermentation industry. Trends Food Sci Tech 15: 67–78.
Morcos SR, Hegazi SM, El-Damhoughy ST (1973). Fermented foods in common use in Egypt. II. The chemical composition of Bouza and its ingredients. J Sci Food Agric 24: 1151–1561.
Öztürk İ, Karaman S, Törnük F, Sağdıç O (2013). Physicochemical and rheological characteristics of alcohol free probiotic boza produced using Lactobacillus casei Shirota: estimation of apparent viscosity of boza using non-linear modeling techniques. Turk J Agric For 37: 475–487.
Rao MA (1999). Rheology of Fluid and Semisolid Foods: Principles and Application. New York, NY, USA: Springer.
Rao MA (2005). Rheological properties of fluid foods. In: Rao MA, Rizvi SSH, Datta AK, editors. Engineering Properties of Foods. 3rd ed. Boca Raton, FL, USA: CRC Press.
Rao MA, Cooley HJ (1992). Rheological behaviour of tomato pastes in steady and dynamic shear. J Texture Stud 23: 415–425.
Rao MA, Tattiyakul J (1999). Granule size and rheological behavior of heated tapioca starch dispersions. Carbohyd Polym 38: 123–132.
Ross-Murphy S (1984). Rheological methods. In: Chan HWS, editor. Biophysical Methods in Food Research. London, UK: Blackwell, pp. 138–199.
Sanni AI (1993). The need for process optimization of African fermented foods and beverages. Int J Food Microbiol 18: 85–95.
Sharpe ME, Fryer E, Smith DG (1966). Identification of lactic acid bacteria. In: Gibbs BM, Skinner FA, editors. Identification Method for Microbiologists, Part A. London, UK: Academic Press, pp. 65–79.
Sikora M, Kowalski S, Tomasik P, Sady M (2007). Rheological and sensory properties of dessert sauces thickened by starch– xanthan gum combinations. J Food Eng 79: 1144–1151.
Steffe JM (1996). Rheological Methods in Food Process Engineering. 2nd ed. East Lansing, MI, USA: Freeman Press.
Tiziani S, Vodovotz Y (2005). Rheological effects of soy protein addition to tomato juice. Food Hydrocolloid 19: 45–52.
Todorov SD (2010). Diversity of bacteriocinogenic lactic acid bacteria isolated from boza, a cereal-based fermented beverage from Bulgaria. Food Control 21: 1011–1021.
Todorov SD, Dicks LMT (2006). Screening for bacteriocin-producing lactic acid bacteria from boza, a traditional cereal beverage from Bulgaria. Comparison of the bacteriocins. Process Biochem 41: 11–19.
Toker OS, Dogan M, Canyilmaz E, Ersoz NB, Kaya Y (2012c). The effects of the different gums and their interactions on the rheological properties of a dairy dessert: a mixture design approach. Food Bioprocess Tech 6: 896–908.
Toker OS, Dogan M, Goksel M (2012a). Prediction of rheological parameters of model instant hot chocolate beverage by adaptive neuro fuzzy inference system. Milchwissenchaft 67: 22–25.
Toker OS, Karaman S, Yuksel F, Dogan M, Kayacier A, Yilmaz MT (2012b). Temperature dependency of steady, dynamic, and creep-recovery rheological properties of ice cream mix. Food Bioprocess Tech 6: 2974–2985.
Uysal UD, Oncu EM, Berikten DI, Yilmaz N, Tuncel NB, Kivanc M, Tuncel M (2009). Time and temperature dependent microbiological and mycotoxin (ochratoxin-A) levels in boza. Int J Food Microbiol 130: 43–48.
Yasar K, Kahyaoglu T, Sahan N (2009). Dynamic rheological characterization of salep glucomannan/galactomannan-based milk beverages. Food Hydrocolloid 23: 1305–1311.
Yilmaz MT, Karaman S, Cankurt H, Kayacier A, Sagdic O (2011). Steady and dynamic oscillatory shear rheological properties of ketchup-processed cheese mixtures: effect of temperature and concentration. J Food Eng 103: 197–210.
Yoo B, Rao MA (1996). A creep and dynamic rheological behavior of tomato concentrates: effect of concentration and finisher screen size. J Texture Stud 27: 451–459.