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  • Title: Cross-linking of soybean protein isolate-chitosan coacervate with transglutaminase utilizing capsanthin as the model core.
    Author: Huang GQ, Xiao JX, Qiu HW, Yang J.
    Journal: J Microencapsul; 2014; 31(7):708-15. PubMed ID: 24963959.
    Abstract:
    Transglutaminase (TG) is an alternative coacervate cross-linking agent to aldehydes due to its safety. In this work, the cross-linking conditions of soybean protein isolate (SPI)-chitosan coacervates with TG-utilizing capsanthin as the model core were optimized and its cross-linking effectiveness was compared with that of glutaraldehyde. Results indicated that the optimum capsanthin microcapsule cross-linking conditions were as follows: a suspension pH of 6.0, an incubation duration of 3 h, a TG concentration of 18.75 U/g SPI and a reaction temperature of 45 °C. Under these conditions, TG provided a cross-linking effectiveness comparable with that of glutaraldehyde in regards to microcapsule stability against swelling in 80 °C water and heating at 150 °C. Differential scanning calorimetry analysis revealed that TG cross-linking increased the integrity of the microcapsule walls. It was concluded that the SPI-chitosan coacervation pair has potential applications in the food industry in terms of cross-linker safety and effectiveness.
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