Physical properties of bacterial cellulose aqueous suspensions treated by high pressure homogenizer. (February 2015)

• Record Type: Journal Article
• Authors: Lin, Dehui; Li, Rui; Lopez-Sanchez, Patricia; Li, Zhixi
• Is Part Of: Food hydrocolloids. Volume 44(2015:Feb.)
• Page Start: 435
• Page End: 442
• Publication Date: 2015-02
• Subjects: Bacterial cellulose aqueous suspension -- High pressure homogenization -- Morphology -- Rheology -- Texture; Hydrocolloids -- Periodicals; Food additives -- Periodicals; Colloïdes -- Périodiques; Aliments -- Additifs -- Périodiques; Colloids; Food additives; Periodicals; Electronic journals; 664.06
• DOI: 10.1016/j.foodhyd.2014.10.019
• Languages: English
• ISSNs: 0268-005X

Abstract

Abstract: In the present study, purified wet bacterial cellulose was disrupted into cellulose aqueous suspensions (0.5%, w/v) and then homogenized by 10 passes at 0, 200, 400 and 600 bar respectively. In order to evaluate the effects of high pressure homogenization (HPH) on bacterial cellulose aqueous suspensions, morphology, rheology, stability, texture, water holding capacity (WHC), water swelling ability (WSA) and water release rate (WRR) were investigated. Morphological analysis by atomic force microscopy revealed changes in microstructure and dispersion of cellulose ribbons after HPH treatment. The diameter of micro-fibril ribbons decreased from 95.6 nm to 60.3 nm with increasing pressure up to 600 bar. The rheology results suggested that all the suspensions displayed a shear thinning behaviour, moreover the suspensions treated by HPH showed 3 regions (shear thinning region, plateau region and shear thinning region again) and the flow curves followed the Herschel–Bulkley model. Furthermore, the stability and textural properties of the suspensions were enhanced after HPH treatment. Additionally, WHC and WSA of cellulose suspensions displayed high stability and the WRR increased after HPH treatment during storage. Graphical abstract: AFM images of BC aqueous suspensions treated at 0 bar (A), 200 bar (B), 400 bar (C) and 600 bar (D), showing changes in microstructure and dispersion of cellulose ribbons after high pressure homogenization. Highlights: Microstructure of BC aqueous suspensions is markedly changed after HPH treatment. HPH treatment is an effective tool to improve physical properties of BC suspensions. BC aqueous suspensions have potential applications in food industry.