Influence of heat treatment of goat milk on casein micelle size, rheological and textural properties of acid gels and set type yoghurts
Abstract
Acid gels and yoghurts were made from goat milk that was heated at 72 degrees C/30 s, 85 degrees C/5 min, and 95 degrees C/5 min, followed by acidification with starter culture at 43C until pH 4.6. The rheological and textural properties of acid gels and yoghurts were analyzed using dynamic low amplitude oscillatory rheology and back extrusion texture analysis, respectively. The effect of goat milk heat treatment on the mean casein micelle diameter and protein profile was also determined by dynamic light scattering and SDS PAGE electrophoresis, respectively. The shortest gelation and fermentation time was recorded for yoghurt prepared from milk heated at 85 degrees C/5 min. Also, the pH of gelation, the storage moduli (G ') and yield stress were higher for this yoghurt, compared with the other two. Textural properties of goat milk yoghurts such as firmness and consistency were strongly affected by milk heat treatment, and the highest values were recorded for yoghurt produced from milk ...preheated at 85 degrees C/5 min, as well. The largest casein micelles were measured after 85 degrees C/5 min treatment and their size decreased at higher temperature, despite higher denaturation of whey proteins at the most intense heat regime, indicating the structure changes that influence on the acid gelation.
Keywords:
goat milk / heat treatment / micelle size / rheology / texture / yoghurtSource:
Journal of Texture Studies, 2020, 51, 4, 680-687Publisher:
- Wiley, Hoboken
Funding / projects:
- Improvement and development of hygienic and technological procedures in production of animal originating foodstuffs with the aim of producing high-quality and safe products competetive on the global market (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-46009)
DOI: 10.1111/jtxs.12524
ISSN: 0022-4901
PubMed: 32281111
WoS: 000528759100001
Scopus: 2-s2.0-85084156108
Collections
Institution/Community
Poljoprivredni fakultetTY - JOUR AU - Hovjecki, Marina AU - Miloradović, Zorana AU - Rac, Vladislav AU - Pudja, Predrag AU - Miočinović, Jelena PY - 2020 UR - http://aspace.agrif.bg.ac.rs/handle/123456789/5404 AB - Acid gels and yoghurts were made from goat milk that was heated at 72 degrees C/30 s, 85 degrees C/5 min, and 95 degrees C/5 min, followed by acidification with starter culture at 43C until pH 4.6. The rheological and textural properties of acid gels and yoghurts were analyzed using dynamic low amplitude oscillatory rheology and back extrusion texture analysis, respectively. The effect of goat milk heat treatment on the mean casein micelle diameter and protein profile was also determined by dynamic light scattering and SDS PAGE electrophoresis, respectively. The shortest gelation and fermentation time was recorded for yoghurt prepared from milk heated at 85 degrees C/5 min. Also, the pH of gelation, the storage moduli (G ') and yield stress were higher for this yoghurt, compared with the other two. Textural properties of goat milk yoghurts such as firmness and consistency were strongly affected by milk heat treatment, and the highest values were recorded for yoghurt produced from milk preheated at 85 degrees C/5 min, as well. The largest casein micelles were measured after 85 degrees C/5 min treatment and their size decreased at higher temperature, despite higher denaturation of whey proteins at the most intense heat regime, indicating the structure changes that influence on the acid gelation. PB - Wiley, Hoboken T2 - Journal of Texture Studies T1 - Influence of heat treatment of goat milk on casein micelle size, rheological and textural properties of acid gels and set type yoghurts EP - 687 IS - 4 SP - 680 VL - 51 DO - 10.1111/jtxs.12524 ER -
@article{ author = "Hovjecki, Marina and Miloradović, Zorana and Rac, Vladislav and Pudja, Predrag and Miočinović, Jelena", year = "2020", abstract = "Acid gels and yoghurts were made from goat milk that was heated at 72 degrees C/30 s, 85 degrees C/5 min, and 95 degrees C/5 min, followed by acidification with starter culture at 43C until pH 4.6. The rheological and textural properties of acid gels and yoghurts were analyzed using dynamic low amplitude oscillatory rheology and back extrusion texture analysis, respectively. The effect of goat milk heat treatment on the mean casein micelle diameter and protein profile was also determined by dynamic light scattering and SDS PAGE electrophoresis, respectively. The shortest gelation and fermentation time was recorded for yoghurt prepared from milk heated at 85 degrees C/5 min. Also, the pH of gelation, the storage moduli (G ') and yield stress were higher for this yoghurt, compared with the other two. Textural properties of goat milk yoghurts such as firmness and consistency were strongly affected by milk heat treatment, and the highest values were recorded for yoghurt produced from milk preheated at 85 degrees C/5 min, as well. The largest casein micelles were measured after 85 degrees C/5 min treatment and their size decreased at higher temperature, despite higher denaturation of whey proteins at the most intense heat regime, indicating the structure changes that influence on the acid gelation.", publisher = "Wiley, Hoboken", journal = "Journal of Texture Studies", title = "Influence of heat treatment of goat milk on casein micelle size, rheological and textural properties of acid gels and set type yoghurts", pages = "687-680", number = "4", volume = "51", doi = "10.1111/jtxs.12524" }
Hovjecki, M., Miloradović, Z., Rac, V., Pudja, P.,& Miočinović, J.. (2020). Influence of heat treatment of goat milk on casein micelle size, rheological and textural properties of acid gels and set type yoghurts. in Journal of Texture Studies Wiley, Hoboken., 51(4), 680-687. https://doi.org/10.1111/jtxs.12524
Hovjecki M, Miloradović Z, Rac V, Pudja P, Miočinović J. Influence of heat treatment of goat milk on casein micelle size, rheological and textural properties of acid gels and set type yoghurts. in Journal of Texture Studies. 2020;51(4):680-687. doi:10.1111/jtxs.12524 .
Hovjecki, Marina, Miloradović, Zorana, Rac, Vladislav, Pudja, Predrag, Miočinović, Jelena, "Influence of heat treatment of goat milk on casein micelle size, rheological and textural properties of acid gels and set type yoghurts" in Journal of Texture Studies, 51, no. 4 (2020):680-687, https://doi.org/10.1111/jtxs.12524 . .