酒类液体中糖含量的介电检测方法-北京师范大学化学学院.pdf

※分析检测 食品科学 2013, Vol.34, No.16 149 酒类液体中糖含量的介电检测方法 黄亚玲，杨 静，赵孔双* (北京师范大学化学学院，北京 100875) 摘 要 - - - (1 20GHz) ：为检测酒饮料中的糖含量，测量乙醇 水二元体系和葡萄糖 乙醇 水三元体系在微波 ～ 范围的介电 谱，通过利用Cole-Cole方程拟合介电数据获得了反映介电弛豫特征的介电参数，并建立不同葡萄糖质量浓度条件 ( ) 下的标准曲线。该标准曲线可用来预测酒中的糖含量：若已知某样品酒的酒精含量 乙醇体积分数 及其介电常数或 弛豫时间，便可估计该样品酒中的糖含量。反之，亦可预测该酒的酒精含量。实验还通过对商品酒进行检测，证实 了该方法的可信性，并可对其他液体食品的检测起借鉴作用。 关键词：微波测量；介电参数；酒；醇；葡萄糖 A Method for Detecting Sugar Content in Alcoholic Beverages by Dielectric Spectroscopy * HUANG Ya-ling ，YANG Jing ，ZHAO Kong-shuang (College of Chemistry, Beijing Normal University, Beijing 100875, China) Abstract ：An analytical method for detecting sugar content in alcoholic beverages by dielectric spectroscopy was presented. Dielectric measurements of binary ethanol/water system and ternary glucose/ethanol/water system were carried out over the frequency band of 1 －20 GHz at 20 ℃. The dielectric parameters characterizing the dielectric behaviors of the ternary system were obtained by fitting the dielectric spectral data with the Cole-Cole equation. A standard curve was established with gradient glucose concentrations and validated for prediction of sugar content in alcoholic beverages. The method allowed estimation of sugar content in samples based on known alcohol content and dielectric constant and alcohol content could be inversely estimated from known sugar content and dielectric constant. Moreover, the reliability of this metho