【摘 要】
：
建立了非线性化学指纹图谱法测定啤酒中乙醇的方法.取4份5mL啤酒标样,分别加入0,1,2和4 mL5％的乙醇,再分别加入20 mL 1 mol/L H2SO4、4 mL 1.25 mol/L丙二酸、3 mL 0.1 mol/L
【机 构】
：
中南大学化学化工学院,华润雪花啤酒(中国)有限公司
论文部分内容阅读
建立了非线性化学指纹图谱法测定啤酒中乙醇的方法.取4份5mL啤酒标样,分别加入0,1,2和4 mL5％的乙醇,再分别加入20 mL 1 mol/L H2SO4、4 mL 1.25 mol/L丙二酸、3 mL 0.1 mol/L硫酸铈铵,以水定容至52 mL.在37.0℃,850 r/min反应条件下,恒速搅拌4 min,快速注入8 mL 0.8 mol/L NaBrO3,记录非线性化学指纹图谱.利用其最大波幅和乙醇含量拟合得出线性回归方程,用于测定其它啤酒中乙醇的含量.结果表明,在一定的浓度范围内,乙醇的浓度与最大波幅值线性关系良好,相关系数R为0.9989～0.9996,样品加标回收率为97.1％ ～ 102.0％,RSD为0.4％～1.7％.本方法快速、简便、重现性好、精密度高,是一种切实可行的测定啤酒乙醇含量的新方法,也可为复杂样品中其它成分的测定提供借鉴手段.
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