旋光法和超声法测量旋光物质浓度的比较研究
时间:2018-11-10 10:10 来源:毕业论文 作者:毕业论文 点击:次
| 摘要食品检测技术一直是关系到国计民生的重大项目，其中旋光法和超声法作为比较适合在实验室运用的方法，在工业生产的应用性也在不断提高。本研究选取旋光法和超声检测法两种方法进行研究，其中，以应用更加成熟的旋光法作为一参照，主要研究超声检测法测量葡萄糖浓度。30086 本论文首先对实验室使用的容器以及声速测量的两种方法之间优劣性以及交互作用进行了对比。通过对方差和相对误差的比较，选取相对较为稳定准确的仪器（标准水槽）以及测量方法（时差法）进行后续的实验。之后重点研究了声速和声衰减随葡萄糖浓度的变化规律。发现声速随葡萄糖浓度的增大而增大，且两者之间满足二次函数关系，与文献结果较为一致。而声衰减则随着葡萄糖浓度的增加呈现先增加后减小的趋势。 关键词：旋光，超声，葡萄糖浓度，声速 毕业论文设计说明书外文摘要 Title A comparative study of the optical rotation and ultrasonic method for measuring the concentration of optically active substances Abstract Food detection technology has been the major projects related to people's livelihood, the optical method and ultrasonic method is more suitable for use in the laboratory method in the application of industrial production also continues to increase. In this study, two methods of optical rotation and ultrasonic detection were studied, and the method of optical rotation was used as a reference, and the concentration of glucose was measured by ultrasonic detection. In this paper, the advantages and disadvantages of the two methods of the container used in the laboratory and the measurement of sound velocity are compared. Through the comparison between the other error and relative error, the relative stability and accuracy of the instrument (standard flume) and the measurement method (Shi Chafa) were selected for the following experiments. Then, the variation of acoustic velocity and sound attenuation with the concentration of glucose was studied. It is found that the velocity of sound increases with the increase of glucose concentration, and the relationship between the two functions is consistent with the results of the literature. However, the sound attenuation increases with the increase of glucose concentration and decreases. Keywords Optical rotation Ultrasound Glucose concentration Speed of sound 目 次 1.绪论 1 1.1食品检测领域成分检测的方法 1 1.2超声法和旋光法检测食品成分领域的优势 1 1.3超声法和旋光法在食品检测领域的应用现状 1 1.4本文的工作 2 2.理论基础 3 2.1声速测量原理 3 2.1.1驻波法 3 2.1.2相位比较法 3 2.1.3时差法 4 2.1.4水中声速理论 4 2.2旋光法测量旋光物质浓度的原理及误差分析 4 3超声法旋光法测量透明介质葡萄糖浓度的实验研究 6 3.1声速的测量 6 3.1.1 声速测量实验装置 6 3.1.2空气中声速的测量 7 3.1.3水中声速测量的方法容器的选择 8 3.1.4声速声衰减随葡萄糖浓度的变化研究 13 3.2旋光法测量葡萄糖浓度的实验研究 17 结 论 20 致 谢 21 参考文献22 1.绪论 1.1食品检测领域成分检测的方法 食品检测技术关系着国计民生，而糖浓度检测技术是食品分析技术中的重要组成部分。在工业生产实际应用中，根据检测的目的的不同，目标成分的不同，采取的方法也有所不同，所以目前在食品检测领域活跃着几种不同的糖浓度检测技术： (责任编辑：qin) |