A system to measure optical rotation (OR) and transmitted light (TL) was built and tested by the Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada (CICATA, México). A similar system was built and tested by the Food Process Engineering Group (FPEG) at Oregon State University. OR and TL values, as a function of time and sample temperature, were recorded by a data acquisition system. Sucrose (1% w/v) and distilled water were used to calibrate both instruments while sucrose solutions were used to determine sensitivity, linearity and stability. The OR of sucrose solutions was measured with less than 3% (0.03 to 20 g/100 mL) and 2% error (0.01 to 20 g/100 mL) for the FPEG and CICATA system, respectively. The instrument setup was tested at CICATA by monitoring sucrose hydrolysis and by comparing initial and final OR with published reference values. Application examples tested by FPEG were the characterization of hard candies and the fermentation monitoring of tepache, a prehispanic alcoholic beverage consumed in Mexico and some Latin American countries. These tests confirmed the instrument versatility and the advantages of building modular units with light sources and electronic components available today at low cost. This work showed, using specific applications, that modular units for well-established optical measurements such as OR and TL could have additional applications in food process control and engineering research.
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机译：建立了一个测量光学旋转（OR）和透射光（TL）的系统，并由墨西哥Cencia Aplicada yTecnologíaAvanzada中心进行了测试。俄勒冈州立大学食品加工工程小组（FPEG）建立并测试了类似的系统。由时间和样品温度决定的OR和TL值由数据采集系统记录。蔗糖（1％w / v）和蒸馏水用于校准这两种仪器，而蔗糖溶液用于确定灵敏度，线性和稳定性。对于FPEG和CICATA系统，测得的蔗糖溶液的OR分别小于3％（0.03至20 g / 100 mL）和2％误差（0.01至20 g / 100 mL）。通过监测蔗糖水解并通过比较初始和最终OR与公布的参考值在CICATA上测试了仪器的设置。通过FPEG测试的应用实例包括硬糖的表征和tepache的发酵监控，tepache是墨西哥和一些拉丁美洲国家所消费的西班牙裔前酒精饮料。这些测试证实了仪器的多功能性以及使用低成本光源和电子组件构建模块化单元的优势。这项工作表明，使用特定的应用程序，用于完善的光学测量（例如OR和TL）的模块化单元可以在食品过程控制和工程研究中有其他应用。
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