Effect of high pressure homogenization (HPH) on the rheological properties of taro (Colocasia esculenta (L). Schott) pulp. (December 2018)

• Record Type: Journal Article
• Authors: Yu, Zhen-Yu; Jiang, Su-Wei; Cai, Jing; Cao, Xin-Min; Zheng, Zhi; Jiang, Shao-Tong; Wang, Hua-Lin; Pan, Li-Jun
• Is Part Of: Innovative food science & emerging technologies. Volume 50(2018)
• Page Start: 160
• Page End: 168
• Publication Date: 2018-12
• Subjects: High pressure homogenization -- Taro pulp -- Rheological properties; Food -- Biotechnology -- Periodicals; Food industry and trade -- Technological innovations -- Periodicals; Aliments -- Biotechnologie -- Périodiques; Food -- Biotechnology; Periodicals; Electronic journals; 664.005
• DOI: 10.1016/j.ifset.2018.09.002
• Languages: English
• ISSNs: 1466-8564

Abstract

Abstract: Our present work was undertaken to evaluate the effect of high pressure homogenization (HPH, from 0 to 60 MPa) on the steady-state shear and viscoelastic properties of taro pulp. HPH reduced taro pulp particle size, increased the dispersion of pulp particles and pulp consistency. The steady flow behavior of the native (0 MPa) and homogenized taro pulps (10–60 MPa) could be well described by the Hershel-Bulkley model. HPH increased the yield stress ( σ 0 ) and consistency index ( k ) of taro pulp, and decreased the flow behavior index ( n ). The dynamic rheological measurement showed that all the pulps (0–60 MPa) have dominant elastic properties over the viscous ones, and that the pulps could be characterized as weak gels. Moreover, HPH increased taro pulp both the storage ( G ′) and loss ( G ′′) modulus, showing that HPH improved pulp both elastic and viscous behavior. The obtained G ′ and G ′′ values were then modeled as a function of oscillatory frequency ( ω ) using the power law model. The observed increase in pulp viscoelasticity could be attributed to taro starch gelatinization and taro protein denaturation induced by HPH process, resulting in the homogenized pulps with stronger gel networks. Highlights: HPH (0–60 MPa) reduced taro pulp particle size, increased the pulp consistency. The flow behavior of the homogenized taro pulps could be well described by the Hershel-Bulkley model. HPH increased the σ 0 and k of taro pulp, and decreased the pulp n . The homogenized pulps (0–60 MPa) could be characterized as weak gels. HPH improved taro pulp both the elastic and viscous behavior.