Acoustic attenuation spectroscopy and helium ion microscopy study of rehydration of dairy powder
Acoustic attenuation spectroscopy and helium ion microscopy study of rehydration of dairy powder
复制标题
乳粉复水的声衰减光谱和氦离子显微镜研究
DOI：
10.1016/j.colsurfa.2020.124795
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Glover Z
中科院分区：
文献类型：
--
作者：
Glover Z
完全水合对于从粉末生产结构化乳制品至关重要。使用的成分必须完全水合。再水化终点的确定是不平凡的，但基于超声的方法在这一领域已显示出潜力，并且非常适合于原位测量散装样品。在这里，声衰减光谱（AAS）被用来监测脱脂奶粉的再水化，和胶束酪蛋白分离物与乳糖和乳清蛋白分离物的重组系统。动态光散射、zeta-电位测量和AAS作为pH值的函数将每个组分在其等电点附近进行滴定，以评估其功能性。使用扫描氦离子显微镜对干燥粉末进行成像，没有任何导电涂层，产生与扫描电子显微镜相当的分辨率，但具有更大的焦距和更少的成像伪影。对粉末进行成像可提供有关可影响溶解行为的粒度和形态的信息。对重构脱脂奶粉和重组样品进行监测，显示在几个小时内发生变化。衰减系数示出预测水化的终点。模型拟合用于提取重组样品中大颗粒和小颗粒群体随时间的体积分数和平均粒径。AAS被证明是能够跟踪动态再水化分散体随时间的推移。可以确定物理参数，例如分散相的体积分数和粒度。
Complete hydration is essential for the production of structured dairy products from powders. It is essential that the ingredients used hydrate completely. Determination of an end point of rehydration is non-trivial, but ultrasound-based methodologies have demonstrated potential in this area and are well suited to measuring bulk samples in situ. Here, acoustic attenuation spectroscopy (AAS) is used to monitor rehydration of skim milk powder, and recombined systems of micellar casein isolate with lactose and whey protein isolate. Dynamic light scattering, zeta-potential measurements and AAS as a function of pH characterise each component around its isoelectric point to assess its functionality. Scanning helium ion microscopy was used to image the dry powders, without any conductive coating, producing resolution equivalent to scanning electron microscopy, but with much larger focal lengths and fewer imaging artefacts. Imaging the powders provides information on particle size and morphology which can affect dissolution behaviour. Reconstituted skim milk powder and recombined samples were monitored showing there are changes occurring over several hours. Attenuation coefficients are shown to predict the end point of hydration. Model fitting is used to extract volume fractions and average particle sizes of large and small particle populations in recombined samples over time. AAS is demonstrated to be capable of tracking the dynamics in rehydrating dispersions over time. Physical parameters such as the volume fraction and particle size of the dispersed phase can be determined.
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影响因子：
10.7
作者：
M. Povey;Jonathan D. Moore;J. Braybrook;Howard Simons;Ron Belchamber;Meera Raganathan;V. Pinfield
通讯作者：
V. Pinfield
由部分酸化的牛奶制备的复水牛奶浓缩蛋白的粒径、钙和磷酸盐溶解以及微观结构的变化
影响因子：
--
作者：
H. Eshpari;P. Tong;M. Corredig
通讯作者：
M. Corredig
DOI：
10.1016/b978-0-12-563730-5.x5000-4
发表时间：
1997-07
期刊：
--
影响因子：
--
作者：
M. Povey
通讯作者：
M. Povey
影响因子：
5.8
作者：
Gaiani, C.;Morand, M.;Scher, J.
通讯作者：
Scher, J.
影响因子：
4.1
作者：
M. Povey
通讯作者：
M. Povey