Abstract
The rheological properties of a fluid have an important role in process development and optimization. Due to its high concentration, frozen concentrated orange juice (FCOJ) shows viscoelastic behaviour, especially at low temperatures. In this study, high pressure homogenization (HPH) processing (0, 25, 50, 75, 100 and 150 MPa) was used to change the viscoelastic properties of FCOJ. The rheological behaviour of the FCOJ, before and after HPH processing, was evaluated using dynamic frequency sweep procedures. The storage (G′) and loss (G″) moduli were modelled as a function of the oscillatory frequency using the power law. The sample processed at 0 MPa showed G′ > G″. On the other hand, all other samples presented G″ > G′. Both the elastic and viscous behaviours decreased with increasing homogenization pressure. The power law parameters were then modelled as a function of the homogenization pressure using exponential functions. Also, the Cox–Merz rule was verified for all the samples, showing good applicability when a linear mathematical modification was applied. The reduction in the elastic and viscous components was explained by the reduction in particle size and molecular size of the serum constituents. A decrease in viscoelasticity leads to less resistance to flow and therefore to lower energy costs for the FCOJ process. These results are useful to understand the phenomena leading to an industrial application of this technology.
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Abbreviations
- α :
-
Linear modification of the Cox–Merz rule, Eq. 8 (–)
- β :
-
Linear modification of the Cox–Merz rule, Eq. 9 (–)
- \( \dot{\gamma } \) :
-
Shear rate (s−1)
- η :
-
Viscosity (Pa s)
- η a :
-
Apparent viscosity (Pa s)
- η*:
-
Complex viscosity (Pa s)
- σ :
-
Shear stress (Pa)
- σ 0 :
-
Yield stress (Pa)
- ω :
-
Oscillatory frequency (Hz)
- G′:
-
Storage (elastic) modulus (Pa)
- G″:
-
Loss (viscous) modulus (Pa)
- G*:
-
Complex modulus (Pa)
- k′:
-
Consistency coefficient for the storage modulus power law (Eq. 1) (Pa sn′)
- k″:
-
Consistency coefficient for the loss modulus power law (Eq. 2) (Pa sn″)
- n′:
-
Behaviour coefficient for the storage modulus power law (Eq. 1) (–)
- n″:
-
Behaviour coefficient for the loss modulus power law (Eq. 2) (–)
- P H :
-
Homogenization pressure (MPa)
- tan δ :
-
Loss tangent = G″/G′ (–)
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Acknowledgments
The authors are grateful to the São Paulo Research Foundation (FAPESP) for funding project no. 2012/15253-9 and for awarding a scholarship to TS Leite (2012/17381-4).
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Leite, T.S., Augusto, P.E.D. & Cristianini, M. Processing Frozen Concentrated Orange Juice (FCOJ) by High Pressure Homogenization (HPH) Technology: Changes in the Viscoelastic Properties. Food Eng Rev 7, 231–240 (2015). https://doi.org/10.1007/s12393-014-9082-y
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DOI: https://doi.org/10.1007/s12393-014-9082-y