小麦粉质特性的可见/近红外光谱快速测定研究

采用可见/近红外光谱对小麦粉质特性参数进行了快速测定研究。在小麦粉厂收集强、中和弱筋小麦粉样品共180份,采用标准方法测定了其粉质特性参数值,然后在波长570~1 080 nm下采集了样品的光谱。对原始光谱进行多元散射校正及一阶导数处理后,首先在全谱范围内建立了形成时间、稳定时间、吸水率、弱化度4个参数的PLS定量预测模型,以吸水率结果最优,其Rp=0.99,RMSEP=1.02;其次是形成时间和弱化度,其Rp值分别为0.97和0.93,RMSEP值分别为0.48和10.01;稳定时间结果稍差,其Rp=0.80,RMSEP=2.40。然后采用SPA方法分别提取了各粉质特性参数的光谱特征变量,对应建立了MLR模型,所建模型和PLS方法结果接近。表明可见/近红外光谱在小麦粉粉质特性评价中具有可行性,同时也为专用便携仪器的研制及小麦粉品质在线设备的开发提供了初步的理论依据。

Rapid Determination of Flour Farinograph Parameters using Visible /Near Infrared Spectroscopy

Farinograph parameters of flour are rapid determined using visible /near infrared spectroscopy. 180 samples of different batches from milling factory were collected, farinograph parameters values were determined using standard method and spectra from 570 to 1080 nanometers were achieved. After MSC and first derivative processing, PLS quantifying models of Development time, Stability time, Absorption and Degree of softening were developed under full spectral range. The Absorption model has the best result with Rp=0.99,RMSEP=1.02. Thereafter are Development time and Degree of softening models. Rp values of them are 0.97and 0.93, RMSEP of them are 0.48 and 10.01 respectively. Model result of Stability time is not as good as others with a result of p=0.80,RMSEP=2.40. Then, SPA method was used to select the sensitive optical characters of above four farinograph parameters, MLR models were developed correspondingly. MLR models have a similar result of PLS method. The study shows it is feasible to determine flour farinograph parameters rapidly using visible /near infrared spectroscopy and it sets foundation for special or on line equipment developing.