TY - JOUR
T1 - Pressurized hot water crosslinking of gelatin-alginate for the enhancement of spent coffee oil emulsion stability
AU - Nkurunziza, David
AU - Ho, Truc Cong
AU - Protzman, Rachael A.
AU - Cho, Yeon Jin
AU - Getachew, Adane Tilahun
AU - Lee, Hee Jeong
AU - Chun, Byung Soo
PY - 2021
Y1 - 2021
N2 - In this study, subcritical water was used to crosslink gelatin and alginate (G/A) at different temperatures (120 °C, 130 °C, 140 °C, 150 °C, and 160 °C) under constant pressure and reaction time (3 MPa, 30 min). Structural and morphological characterization was performed using Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), nuclear magnetic resonance spectroscopy (1H NMR), and scanning electron microscopy (SEM). The coffee oil-filled hydrogels were prepared using G/A blend by ultrasound sonication. The emulsions revealed a unimodal distribution of particles with varying diameters (654 ± 98) nm, (509 ± 44) nm, and (412 ± 68) nm for G/A at 120 °C, 130 °C and 140 °C, respectively. However, the treatment of G/A at 150 °C and 160 °C resulted in bimodal size distribution and declined viscosity, and indicated the molecular degradation of hydrogels leading to weak repulsion force against droplet aggregation. Highly stable emulsions were observed from G/A at (120–140) °C, while at 150 °C and 160 °C, the emulsion exhibited poor stability during 7 weeks of storage at 5 °C and 25 °C.
AB - In this study, subcritical water was used to crosslink gelatin and alginate (G/A) at different temperatures (120 °C, 130 °C, 140 °C, 150 °C, and 160 °C) under constant pressure and reaction time (3 MPa, 30 min). Structural and morphological characterization was performed using Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), nuclear magnetic resonance spectroscopy (1H NMR), and scanning electron microscopy (SEM). The coffee oil-filled hydrogels were prepared using G/A blend by ultrasound sonication. The emulsions revealed a unimodal distribution of particles with varying diameters (654 ± 98) nm, (509 ± 44) nm, and (412 ± 68) nm for G/A at 120 °C, 130 °C and 140 °C, respectively. However, the treatment of G/A at 150 °C and 160 °C resulted in bimodal size distribution and declined viscosity, and indicated the molecular degradation of hydrogels leading to weak repulsion force against droplet aggregation. Highly stable emulsions were observed from G/A at (120–140) °C, while at 150 °C and 160 °C, the emulsion exhibited poor stability during 7 weeks of storage at 5 °C and 25 °C.
KW - Biopolymer blending
KW - Crosslinking
KW - Emulsion stability
KW - Pressurized hot water
U2 - 10.1016/j.supflu.2020.105120
DO - 10.1016/j.supflu.2020.105120
M3 - Journal article
AN - SCOPUS:85096939258
VL - 169
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
SN - 0896-8446
M1 - 105120
ER -