Han Chien-Yuan, Du Cheng-You, Chen De-Fu
Opt Express. 2018 Jun 11;26(12):15851-15866. doi: 10.1364/OE.26.015851.
Starch is an essential and widely distributed natural material, but its detailed conformation and thermal transition properties are not yet well understood. We present a rapid Mueller matrix imaging system to explore the structural characteristics of starch granules by using 16 measurements with different incoming and outgoing polarizations. Due to the minimum rotation of the optical elements and the self-calibration ability of this system, the full Mueller matrix images can be accurately obtained within ten-odd seconds. Both structural and molecular features of the starch granule were investigated in the static state and gelatinization process by means of multiple optical characteristics deduced from the Mueller matrix. The experimental results for the structural changes during the gelatinization were close to other nonlinear optical approaches; moreover, the crystallinity and optical rotation of the starch granule are also determined through the use of this approach.
淀粉是一种重要且广泛分布的天然物质，但其详细的构象和热转变特性尚未得到充分理解。我们提出了一种快速穆勒矩阵成像系统，通过使用16种不同入射和出射偏振的测量来探索淀粉颗粒的结构特征。由于该系统光学元件的最小旋转以及自校准能力，在十几秒内即可准确获得完整的穆勒矩阵图像。借助从穆勒矩阵推导的多种光学特性，在静态和糊化过程中研究了淀粉颗粒的结构和分子特征。糊化过程中结构变化的实验结果与其他非线性光学方法相近；此外，通过这种方法还能测定淀粉颗粒的结晶度和旋光度。
