Viscoelastic behavior of persimmons dried at constant air temperature |
| |
| Affiliation: | 1. Departamento de Engenharia de Alimentos, Universidade Estadual de Campinas, 13038-970, Campinas, SP, Brazil;2. Departamento de Engenharia e Tecnologia de Alimentos, Universidade Estadual Paulista, 15054-000, São José do Rio Preto, SP, Brazil;1. Department of Analytical Chemistry, University of Granada, Avda. Fuentenueva s/n, 18071 Granada, Spain;2. Functional Food Research and Development Centre (CIDAF), Health Science Technological Park, Avda. del Conocimiento s/n, Ed. Bioregion, 18016 Granada, Spain;3. Unidad Mixta IBMC – FMC FoodTech, Instituto de Biología Molecular y Celular, Universidad Miguel Hernández de Elche, Carretera de Beniel, Km 3, 2, 03312 Orihuela, Alicante, Spain;1. Science and Engineering Faculty, Queensland University of Technology (QUT), 2 George St, Brisbane, QLD 4000, Australia;2. Department of Mechanical Engineering, Dhaka University of Engineering and Technology, Gazipur 1700, Bangladesh;3. Engineering Faculty, Vietnam National University of Agriculture, Hanoi, Vietnam;1. NMR Center, Departamento de Química, Universidade Federal do Paraná, 81530-900 Curitiba, PR, Brazil;2. Department of Pharmacy, Universidade Federal do Paraná, 80210-170 Curitiba, PR, Brazil;3. Phytotechny and Phytosanitary Departament, Universidade Estadual de Ponta Grossa, 84030900 Ponta Grossa, PR, Brazil |
| |
| Abstract: | The viscoelastic behavior of dried persimmons at different air-drying temperatures and velocities was evaluated. Air temperatures and velocities were varied according to a second-order central composite design, with temperature ranging from 40°C to 70°C and air velocity from 0.8 to 2.0 m/s. After drying, persimmons were equilibrated at four different water activities: 0.432, 0.576, 0.625 and 0.751. The rheological behavior of dried and conditioned persimmons was studied under uniaxial compression–relaxation tests. Three different rheological models were fitted to the experimental relaxation curves: Maxwell, Generalized Maxwell and Peleg and Normand. Based on the root mean square of residuals, the Generalized Maxwell model showed the best fit and a regression analysis was applied to obtain response surfaces for the model parameters. The dependence of the rheological properties on water activity was also analysed. Results showed that only the linear effect of air temperature was significant at a 5% level on the equilibrium stress and relaxation times. In a general way, these parameters increased with increasing air temperature and decreasing water activity. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
