Structural and rheological properties of bigels formed with xanthan gum hydrogel and lecithin/glycerol monostearate
Hee Jin Yi1, Yu-Ra Kang1, Yoon Hyuk Chang1
1Department of Food and Nutrition, and Bionanocomposite Research Center, Kyung Hee University, Seoul 02447, Republic of Korea.
Abstract:
This study aimed to investigate the structural and rheological properties of bigels formed with xanthan gum hydrogel and lecithin/glycerol monostearate oleogel. Different ratios (7:3, 6:4, 5:5, 4:6, and 3:7, respectively) of xanthan gum hydrogel and lecithin/glycerol monostearate oleogel were used for producing bigels (BG-7:3, BG-6:4, BG-5:5, BG-4:6, and BG-3:7). Through visual appearance, inversion test, and storage stability test, all bigels showed a white creamy appearance with self-standing properties and storage stability for three weeks. According to CLSM analysis, BG-7:3, BG-6:4, and BG-5:5 formed an oleogel-in-hydrogel system, whereas BG-4:6 and BG-3:7 showed a bicontinuous system. Solvent holding capacity was >95 % for all bigels. Steady shear rheological analysis and three interval thixotropic test revealed that all bigels exhibited shear-thinning behavior and thixotropic recovery. Frequency sweep test revealed that storage modulus (G'), loss modulus (G″), and complex viscosity (η*) of bigels were remarkably increased as the ratio of oleogel fraction increased in bigels. These results suggest that bigels formed with xanthan gum hydrogel and lecithin/glycerol monostearate oleogel can be unique candidates for replacing fat in the food industry.
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