Jelatin ve Karagenan Karışımlarının reolojik ve yapısal analizleri

Yıl 2019, Cilt: 6 Sayı: 3, 525 - 532, 30.09.2019

Güler Bengusu Tezel , Sibel Uzuner , Gülsün Akdemır Evrendılek

https://doi.org/10.31202/ecjse.555108

Öz

Bu çalışmada, kütlece %1’lik jelatin-karagenan (G-CR) karışımının hacimce 1:1 ve 2:1  oranlarında pH 7.0 de stres kontrollü reometre ile reolojik yatışkın kayma ve dinamik ölçümleri yapılmıştır.  Sonuçlar, gayet yüksek eşik stresine sahip G-CR karışımları için en yüksek tahmin katsayısı veren (R²=0.993) Herschel-Bulkley (HB) reolojik akış modeline göre uyum göstermektedir. Karagenan, jelatine göre (G’≈10) daha yüksek mertebeli (G’≈10³) elastik modüle sahip olduğundan, G-CR karışımına  CR katkısının jel dayanımını arttırdığı gözlenmiştir.  Karışımdaki , 2:1 karışım oranında 13 ^oC ve pH 7 de, jel dayanımı tekstür cihazı ile 4.71 N olarak bulunmuştur. Ayrıca, bu çalışmada jel ağlarındaki mukavemet artışı jellerin SEM analizleri ile desteklenmiştir.

Anahtar Kelimeler

Reolojik Ölçümler

Structural and Rheological Properties of Gelatin-Carrageenan Mixtures

Öz

Rheological steady shear and dynamical measurement of gelatin-carragenan (G-CR) 1%, w/v mixtures at mixing ratios of 1:1 and 2:1at pH 7.0 were performed using stress controlled rheometer. The results reveal that Herschel-Bulkley (HB) rheological flow model gives the best fit (R2=0.993) to capture the flow characteristics of highly yielding G-CR mixtures. Carrageenan improves the gel strength of the mixture due to moving towards more elastic modulus (order of G’≈103) as compared to gelatin elastic modulus (order of G’≈10). At 1.0 % of gum concentration, 2:1 of gum ratio, 13 oC of temperature, and pH of 7.0, the gel strength texture for G-CR mixtures were found to be as 4.71 N. Strengthening of gel network structures were also confirmed using SEM analysis of G-CR mixtures.

Anahtar Kelimeler

Rheological measurements

Kaynakça

• [1] Schmitt C., Sanchez C., Desobry-Banon, S., Hardy J., Structure and technofunctional properties of protein-polysaccharide complexes: A review, Crit. Rev. Food Sci. Nutr., 38 (1998) 689-753.
• [2] Schmitt C. and Turgeon S.L., Protein/polysaccharide complexes and coacervates in food systems,Adv. Colloid Interface Sci., 167 (2011) 63-70.
• [3] Pranoto Y., Lee, C.M., Park H.J., Characterization of fish gelatin films added with gellan and κ-carrageenan, LWT - Food Sci Technol., 40 (2007) 766-774.
• [4] Sinthusamran S. Benjakul S., Physical: Rheological and antioxidant properties of gelatin gel as affected by the incorporation of β–glucan, Food Hydrocoll., 79 (2018) 409-415.
• [5] Izmailova, V.N., Derkach, S.R., Sakvarelidze, M.A., Levachev, S.M., Voron’ko, N.G., Yampol’skaya G.P., Gelation in gelatin and gelatin-containing multicomponent blends, Polymer Sci. C, 46 (2004) 73-92.
• [6] Johnston-Banks F.A., Food gels, Elsevier Science Publishing Co., New York (1990) 233-289.
• [7] Anvari, M., Chung D., Dynamic rheological and structural characterization of fish gelatin – gum Arabic coacervate gels cross-linked by tannic acid, Food Hydrocoll., 60 (2016) 516-524.
• [8] Yang, Z. and Yang, H., Effects of sucrose addition on the rheology and microstructure of κ-carrageenan gel, Food Hydrocolloids, 75 (2018) 164-173.
• [9] Derkach, S.R., Voron’ko, N.G, Maklakova, A.A., Kondratyuk Y.V., The rheological properties of gelatin gels containing κ-carrageenan. The role of polysaccharide, Colloid J., 76 (2014) 146-152.
• [10] Vajravelu, K., Sreenadh, S. and Ramesh Babu, V., Peristaltic Transport of a Herschel-Bulkley Fluid in an Inclined Tube, Int. J. Non-Linear Mech., 40 ( 2005) 83-90.
• [11] Chaturani, P. and Ponalagusamy, R., Pulsatile Flow of Casson’s Fluid through Stenosed Arteries with Appli-cations to Blood Flow, Biorheology, 23 (1986) 499 – 511.
• [12] Malkin, A., Kulichikhin, V., Ilyin S., A modern look on yield stress fluids, Rheol. Acta, 56 (2017), 177-188.
• [13] Anvari, M., Chung D., Dynamic rheological and structural characterization of fish gelatin – gum Arabic coacervate gels cross-linked by tannic acid, Food Hydrocoll., 60 (2016) 516-524.
• [14] Bourne, M.C. Texture profile analysis, Food Technol., 32 (1978) 62-67.
• [15] Sharma, M., Kristo, E., Corredig, M., Duizer L., Effect of hydrocolloid type on texture of pureed carrots: rheological and sensory measures, Food Hydrocoll., 63 (2017) 478-487.
• [16] Makshakova, O.N., Faizullin, D.A., Mikshina, P.V, Gorshkova, T.A., Zuev Yu Z., Spatial structures of rhanmogalacturonan I in gel and colloidal solution indentified by 1D and 2D-FTIR spectroscopy, Carbohyd. Polym., 192 (2018) 231-239.
• [17] Pranoto, Y., Lee, C.M., Park H.J., Characterizations of fish gelatin films added with gellan and κ-carrageenan LWT - Food Sci. Technol., 40 (2007) 766-774.
• [18] Derkach, S.R, Ilyin, S.A, Maklakova, A.A., Kulichikhin, V.G, Malkin A.Y, The rheology of gelatin hydrogels modified by κ-carrageenan, LWT - Food Sci. Technol., 63 (2015) 612-619.
• [19] Sow, L.C, Kong, K., Yang H., Structural modification of fish gelatin by the addition of gellan, κ-carrageenan, and salts mimics the critical physicochemical properties of pork gelatin, J. Food Sci., 83 (2018) 1280-1291.