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Effect of the native fat globule size on foaming properties and foam structure of milk
Journal of Food Engineering ( IF 5.5 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jfoodeng.2020.110227 Thao M. Ho , Pramesh Dhungana , Bhesh Bhandari , Nidhi Bansal
Journal of Food Engineering ( IF 5.5 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jfoodeng.2020.110227 Thao M. Ho , Pramesh Dhungana , Bhesh Bhandari , Nidhi Bansal
Abstract In this study, effect of the native fat globule (NFG) size on the foaming properties of milk was evaluated. In order vary the size of NFGs in milk (0.8, 2.6, 3.7, 4.7 and 5.5 μm), separating cones of a commercial cream separator were modified, and combination of various fractionation and separation stages was utilized. All milk samples were standardized to 3.5% fat content (w/w). Results showed that the surface tension of the milk samples was independent of the NFG size, while viscosity and absolute zeta-potential values increased with an increase in the NFG size. Foamability of the milk samples only improved when the size of NFG was less than 2.6 μm. Average size of the air bubbles in foam increased with an increase in the NFG size, but the foam stability was not affected by the NFG size. A comparison with the homogenised milk samples of similar fat globule sizes suggested that the fat globule size controlled foamability while the alterations in the fat globule membrane composition governed the foam stability.
中文翻译:
天然脂肪球大小对牛奶起泡特性和泡沫结构的影响
摘要 在这项研究中,评估了天然脂肪球 (NFG) 大小对牛奶发泡特性的影响。为了改变牛奶中 NFG 的大小(0.8、2.6、3.7、4.7 和 5.5 μm),改进了商业奶油分离器的分离锥,并利用了各种分馏和分离阶段的组合。所有牛奶样品都标准化为 3.5% 的脂肪含量 (w/w)。结果表明,牛奶样品的表面张力与 NFG 尺寸无关,而粘度和绝对 zeta 电位值随着 NFG 尺寸的增加而增加。仅当 NFG 的尺寸小于 2.6 μm 时,牛奶样品的发泡性才会提高。泡沫中气泡的平均尺寸随着NFG尺寸的增加而增加,但泡沫稳定性不受NFG尺寸的影响。
更新日期:2021-02-01
中文翻译:
天然脂肪球大小对牛奶起泡特性和泡沫结构的影响
摘要 在这项研究中,评估了天然脂肪球 (NFG) 大小对牛奶发泡特性的影响。为了改变牛奶中 NFG 的大小(0.8、2.6、3.7、4.7 和 5.5 μm),改进了商业奶油分离器的分离锥,并利用了各种分馏和分离阶段的组合。所有牛奶样品都标准化为 3.5% 的脂肪含量 (w/w)。结果表明,牛奶样品的表面张力与 NFG 尺寸无关,而粘度和绝对 zeta 电位值随着 NFG 尺寸的增加而增加。仅当 NFG 的尺寸小于 2.6 μm 时,牛奶样品的发泡性才会提高。泡沫中气泡的平均尺寸随着NFG尺寸的增加而增加,但泡沫稳定性不受NFG尺寸的影响。