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How do smoothing conditions and storage time change syneresis, rheological and microstructural properties of nonfat stirred acid milk gel?
International Dairy Journal ( IF 3.1 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.idairyj.2020.104780 Valérie Guénard-Lampron , Véronique Bosc , Daniel St-Gelais , Sébastien Villeneuve , Sylvie L. Turgeon
International Dairy Journal ( IF 3.1 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.idairyj.2020.104780 Valérie Guénard-Lampron , Véronique Bosc , Daniel St-Gelais , Sébastien Villeneuve , Sylvie L. Turgeon
Abstract Nonfat acid milk gel, acidified by GDL, was used to simulate microbial fermentation of milk to produce stirred yoghurt. Acid milk gel preparation at laboratory scale included stirring, pumping, smoothing and cooling operations. Two filters (pre-smoothed, 1 mm; smoothed, 500 μm), three smoothing temperatures (13, 22 and 35 °C) and two storage times (1 and 22 days) were studied. Syneresis, microgels size and smoothness of microgels were analysed for pre-smoothed and smoothed gels; viscosity, storage modulus, firmness and total pore area were only analysed for smoothed gel. After 1 and 22 days of storage, pre-smoothed gels developed lower syneresis and smaller microgels than smoothed gels at 22 °C. For smoothed gels, regardless of the smoothing temperature, syneresis, firmness, microgels size and smoothness increased during storage, while total pore area decreased and viscosity remained stable. Viscosity was lower when smoothing was performed at 35 °C and was correlated to rougher microgels.
中文翻译:
平滑条件和储存时间如何改变脱脂搅拌酸性乳凝胶的脱水收缩、流变学和微观结构特性?
摘要 采用GDL酸化脱脂乳凝胶模拟牛奶微生物发酵生产搅拌型酸奶。实验室规模的酸性乳凝胶制备包括搅拌、泵送、平滑和冷却操作。研究了两个过滤器(预平滑,1 毫米;平滑,500 微米)、三个平滑温度(13、22 和 35°C)和两个存储时间(1 天和 22 天)。分析预平滑和平滑凝胶的脱水收缩、微凝胶大小和微凝胶的平滑度;粘度、储能模量、硬度和总孔面积仅分析平滑凝胶。储存 1 天和 22 天后,预平滑凝胶在 22 °C 下比平滑凝胶产生更低的脱水收缩和更小的微凝胶。对于平滑的凝胶,无论平滑温度如何,脱水收缩、紧实度、微凝胶大小和在储存期间增加的平滑度,而总孔隙面积减少,粘度保持稳定。在 35 °C 下进行平滑时粘度较低,并且与较粗糙的微凝胶相关。
更新日期:2020-10-01
中文翻译:
平滑条件和储存时间如何改变脱脂搅拌酸性乳凝胶的脱水收缩、流变学和微观结构特性?
摘要 采用GDL酸化脱脂乳凝胶模拟牛奶微生物发酵生产搅拌型酸奶。实验室规模的酸性乳凝胶制备包括搅拌、泵送、平滑和冷却操作。研究了两个过滤器(预平滑,1 毫米;平滑,500 微米)、三个平滑温度(13、22 和 35°C)和两个存储时间(1 天和 22 天)。分析预平滑和平滑凝胶的脱水收缩、微凝胶大小和微凝胶的平滑度;粘度、储能模量、硬度和总孔面积仅分析平滑凝胶。储存 1 天和 22 天后,预平滑凝胶在 22 °C 下比平滑凝胶产生更低的脱水收缩和更小的微凝胶。对于平滑的凝胶,无论平滑温度如何,脱水收缩、紧实度、微凝胶大小和在储存期间增加的平滑度,而总孔隙面积减少,粘度保持稳定。在 35 °C 下进行平滑时粘度较低,并且与较粗糙的微凝胶相关。