Effect of spray freeze drying on the structural modification and rehydration characteristics of micellar casein powders. (August 2022)

• Record Type: Journal Article
• Authors: Ren, Jinbo; Liao, Minjie; Ma, Lingjun; Chen, Fang; Liao, Xiaojun; Hu, Xiaosong; Miao, Song; Fitzpatrick, John; Ji, Junfu
• Is Part Of: Innovative food science & emerging technologies. Volume 80(2022)
• Publication Date: 2022-08
• Subjects: Micellar casein (MC) -- Spray freeze drying (SFD) -- Droplet size -- Rehydration behaviors -- Colloidal calcium phosphate (CCP); 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.2022.103093
• Languages: English
• ISSNs: 1466-8564

Abstract

Abstract: Micellar casein (MC) is usually spray-dried into powder form for transportation and storage. However, the micellar structure maintained by colloidal calcium phosphate (CCP) and hydrophobic forces leads to poor rehydration ability of MC powders, which limits its potential applications. Here, spray freeze drying (SFD) with controlled droplet size was used to produce MC powders. Their effects on the structure of MC and the subsequent rehydration characteristics including wetting, dispersion and dissolution were investigated. The results showed SFD powders obtained from smaller droplet size caused more than 50% of serum Ca 2+ and PO4 3− to release from the micellar structure. These powder particles exhibited extremely high porosity (92%) and spherical morphology, which thus greatly shortened their wetting time. Furthermore, the smallest droplets during SFD were believed to produce the MC powders with the quickest dispersion and best solubility, as over 80% of the solids could be completely dissolved in just 15 min. Graphical abstract: Unlabelled Image Highlights: SFD powders exhibited spherical morphology and extremely high porosity of over 92%. SFD powders produced by smaller droplet caused higher dissociation degree of CCP. Wetting time of SFD powders was shortened and the dispersion process was accelerated. Over 80% solids of the SFD-S sample could be completely dissolved within just 15 min.