太赫兹时域光谱技术测定淀粉中的丙烯酰胺

发布时间：2018-03-15 01:17

本文选题：丙烯酰胺　切入点：太赫兹时域光谱　出处：《中国食品学报》2017年03期 　论文类型：期刊论文

【摘要】：目的:利用太赫兹时域光谱(terahertz time-domain spectroscopy,THz-TDS)技术对丙烯酰胺、淀粉及两者混合物进行定性、定量检测。方法:通过采集时域光谱数据,获得丙烯酰胺、淀粉及两者混合物在THz波段的吸收谱与折射率谱;采用偏最小二乘法(partial least squares,PLS)对淀粉中丙烯酰胺的低浓度含量进行回归拟合分析。结果:丙烯酰胺在1.33 THz处有一个明显的特征吸收峰,可用于物质识别;随着混合物中丙烯酰胺质量的增加,样品的吸收系数和折射率都呈现逐渐下降的趋势。由回归模型分析可得,混合物中丙烯酰胺质量含量与吸收系数、折射率都有良好的线性关系,其中基于折射率的PLS模型相关系数可达0.9994,标准误差0.1335%,检出极限0.4402%,定量限1.334%,最大绝对偏差小于0.2497%。结论:THz-TDS技术具有检测结果可靠的优点,可用于淀粉中丙烯酰胺含量的快速、无损检测,为太赫兹光谱检测食品中的有害添加物提供了理论基础。
[Abstract]:Objective: using terahertz time-domain spectroscopy (terahertz time-domain spectroscopy, THz-TDS) technology for quantitative detection of starch and acrylamide, a mixture of qualitative. Methods: by collecting the data of acrylamide time domain spectrum, spectrum and refractive index spectrum, and the mixture of starch in the THz band absorption; using partial least squares (partial least, squares, PLS) low concentration of starch acrylamide in the regression analysis. Results: acrylamide has an obvious characteristic absorption peak at 1.33 THz, can be used for material identification; with the increase of the mixture of acrylamide in quality of the samples, the absorption coefficient and refractive index decreased gradually. By regression analysis, acrylamide the quality of content in the mixture and absorption coefficient, refractive index has a good linear relationship, which is based on the PLS model of refractive index The number is 0.9994, the standard error of 0.1335%, the detection limit of 0.4402%, the quantitative limit is 1.334%, the maximum absolute deviation is less than 0.2497%.. Conclusion: THz-TDS has the advantages of reliable detection result, can be used for acrylamide content in the starch rapid, nondestructive testing, and provides the theoretical basis for the terahertz spectroscopy detection of harmful additives in food.

【作者单位】：太赫兹技术与应用研究所中国计量大学;
【基金】：国家自然科学基金项目(21205110) 浙江省自然科学基金项目(LY15B050004)
【分类号】：O657.3;TS237

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