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Influence of honey types and heating treatment on the rheological properties of glutinous rice flour gels

Seow, Eng-Keng, Gan, Chee-Yuen, Tan, Thuan-Chew, Lee, Lai Kuan, Easa, Azhar Mat
Journal of food science and technology 2019 v.56 no.4 pp. 2105-2114
amylases, enzyme activity, gels, glutinous rice, heat treatment, honey, models, rice flour, stingless bees, storage modulus, viscosity
Present study compared the rheological properties of glutinous rice flour (GRF) gel (33.3%, w/v) added with raw bee honey (RBH) or stingless bee honey (SBH) with/without heating treatment. RBH (diatase activity: 12.14 Schade) and SBH (1.53 Schade) significantly reduced the network of GRF gel by lowering the gel viscosity, with RBH having the highest rate of viscosity decrease (− 2.74 × 10⁻⁵ Pa). As the addition of heated-SBH or heated-RBH did not reduce gel viscosity, it was hypothesised that active diastase played a major role to weaken gel network. This was further supported by the significant and the lowest storage modulus (G′) value of RBH–GRF gel (5.99 ± 0.02 Pa), as compared to SBH–GRF (6.27 ± 0.04 Pa) and control (6.33 ± 0.04 Pa). A detail of rheological behaviour of the gels was further explained using power law. Overall, this GRF gel model has successfully demonstrated the potential of honey diastase in weakening network of starch-based food.