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首页> 美国卫生研究院文献>Scientifica >Properties of Particle Size Distribution from Milled White Nixtamalized Corn Kernels as a Function of Steeping Time
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Properties of Particle Size Distribution from Milled White Nixtamalized Corn Kernels as a Function of Steeping Time

机译：碾磨的白色九成玉米颗粒的粒径分布特性与浸泡时间的关系

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摘要

This paper focuses on the particle size distribution (PSD) changes during nixtamalized corn kernels (NCK) as a function of the steeping time (ST). The process to obtain powder or corn flour from NCK was as follows: (i) the NCK with different STs were wet-milled in a stone mill, (ii) dehydrated by a Flash type dryer, and (iii) pulverized with a hammer mill and sieved with a 20 mesh. The powder was characterized by measuring the PSD percentage, calcium percentage (CP), peak viscosity at 90°C (PV), and crystallinity percentage (CP). The PSD of the powder as a function of ST was determined by sieving in Ro-TAP equipment. By sieving, five fractions of powder were obtained employing meshes 30, 40, 60, 80, and 100. The final weight of the PSD obtained from the sieving process follows a Gaussian profile with the maximum corresponding to the average particle obtained with mesh 60. The calcium percentage as a function of ST follows a behavior similar to the weight of the PSD. The study of crystallinity versus the mesh number shows that it decreases for smaller mesh number. A similar behavior is observed as steeping time increases, except around ST = 8 h where the gelatinization of starch is observed. The trend of increasing viscosity values of the powder samples occurs when increasing ST and decreasing particle size. The ST significantly changes the crystallinity and viscosity values of the powder and, in both cases, a minimum value is observed in the region 7–9 h. The experimental results show that the viscosity increases (decreases) if the particle size decreases (increases).
机译：本文着重介绍了在尼克玛化玉米粒（NCK）期间颗粒尺寸分布（PSD）随浸泡时间（ST）的变化。从NCK获得粉末或玉米粉的过程如下：（i）将具有不同ST的NCK在石磨机中湿磨，（ii）通过Flash型干燥机脱水，并且（iii）用锤磨机粉碎。并用20目筛子过筛。通过测量PSD百分比，钙百分比（CP），在90℃的峰值粘度（PV）和结晶度百分比（CP）来表征粉末。通过在Ro-TAP设备中筛分来确定粉末的PSD作为ST的函数。通过筛分，使用网眼30、40、60、80和100可获得五部分粉末。从筛分过程中获得的PSD的最终重量遵循高斯分布，其最大值对应于通过网眼60获得的平均颗粒。钙百分比作为ST的函数，其行为类似于PSD的重量。结晶度与目数的关系研究表明，结晶度随目数的减小而降低。随着浸泡时间的增加，观察到类似的行为，除了ST = 8 h左右，观察到淀粉的糊化。当增加ST和减小粒径时，会出现粉末样品粘度值增加的趋势。 ST显着改变了粉末的结晶度和粘度值，在这两种情况下，在7–9 h区域均观察到最小值。实验结果表明，如果粒径减小（增加），则粘度增加（减小）。

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