Development of methodology for assessing flowability of milk protein powders using shear failure testing device
Development of methodology for assessing flowability of milk protein powders using shear failure testing device
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开发使用剪切破坏测试装置评估乳蛋白粉流动性的方法
DOI：
10.1016/j.jfoodeng.2023.111450
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发表时间：
2023
影响因子：
5.5
通讯作者：
Sharma, Prateek
中科院分区：
文献类型：
--
作者：
Palmer, Katelynn;Parhi, Ashutos;Shetty, Abhishek;Sunkesula, Venkateswarlu;Sharma, Prateek
富含蛋白质的奶粉在生产和储存过程中容易结块和结块。开发了一种客观、可靠地评估其流动性的方法，即粉末不粘在设备表面的倾向。牛奶蛋白粉(MPC-80)在MCR302e流变仪上的粉状剪切仪上进行了三点剪切破坏试验。对预剪切点和剪切破坏点进行莫尔圆分析，得到流动函数系数。由于其球形和明显较大的颗粒尺寸(50-70μm)，牛奶蛋白粉末表现出更多的粘滑现象和缺少剪切到断裂点，特别是在较高的预剪切力(>；6μm)和剪切法向应力下(<；20 kpa m)，而不是扁平形状、较小尺寸(<；20 kpa)的粘性碳酸钙粉末(在3.0kPa时的ffc值为2.1%)。牛奶蛋白粉中没有剪切到故障点的原因是由于较大的颗粒尺寸和球状形状导致粉末在较高的法向应力下瞬间失效，这可以通过降低预剪切力(3、6和9 kpa到1、3和6 kpa)和剪切法向应力、增加数据采集间隔和优化剪切速度来避免。在3.0kPa预剪切法向应力下，MPC 80粉末易流动，MPI 85粘结性好(3.7±0.5)，获得了可靠的效应值。
Protein-rich milk powders can be susceptible to caking and clumping during manufacture and storage. A method was developed for objective and reliable assessment of their flowability, i.e., tendency of powders not to stick to the equipment surfaces. Milk protein powder (MPC 80) was subjected to three-point shear failure testing on a powder shear cell attached to a MCR302e rheometer. Flow function coefficients (ffc) were obtained after the Mohr circle analysis of pre-shear and shear-to-failure points. Due to their globular shape and significantly larger particle size (50–70 μm), milk protein powders exhibited more stick-slip phenomenon and lack of shear-to-failure points particularly at higher pre-shear (>6 kPa) and shearing normal stresses than the flat-shaped, smaller size (<20 μm) cohesive calcium carbonate powder (ffcvalue 2.1 at 3.0 kPa). Absence of shear-to-failure points in milk protein powders was attributed to instant failure of the powder at higher normal stresses due to larger particle size and globular shape, which was avoided by lowering pre-shear (3, 6, and 9 kPa to 1, 3 and 6 kPa) and shearing normal stresses, increasing data capturing interval and optimizing shear speed. Reliableffcvalues at 3.0 kPa pre-shear normal stress, characterizing MPC 80 powder (4.6 ± 0.4) as easy flowing and MPI 85 as cohesive (3.7 ± 0.5) were obtained successfully using developed protocol.
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