陈亚威 张业鹏 范志勇



摘要 [目的]探讨液相色谱-同位素质谱法(LC-IRMS)技术在蜂蜜掺假鉴定中的应用效果。[方法]采用LC-IRMS法检测随机抽样的62个蜂蜜样品,对蜂蜜中果糖(Fru)、葡萄糖(Glu)、二糖和三糖δ13C值进行测定。[结果]由于真实蜂蜜中果糖、葡萄糖、二糖和三糖的δ13C的最大值与最小值的差值小于2.1‰,果糖、葡萄糖的δ13C差值(δ13CFru - δ13CGlu)为-1‰ ~1‰,且不得含有寡糖,所以该次检测样品中有48.38%的蜂蜜不合格,掺假掺杂以添加C-3 植物源转化产物和淀粉糖浆为主,应加强对这类掺假的监控管理。[结论] LC-IRMS实现了蜂蜜中各种糖组分如果糖、葡萄糖、二糖和三糖等δ13C的分离与分析,可进行添加了C-3糖浆的掺假鉴定,大大提高了蜂蜜掺假的检测能力。
关键词 液相色谱-同位素质谱;蜂蜜;掺假;δ13C值
中图分类号 S896.1;TS207.3 文献标识码 A 文章编号 0517-6611(2017)07-0009-02
Identification of Honey Adulteration by Liquid Chromatography-isotope Mass Spectrometry (LC-IRMS)
CHEN Ya-wei1,2, ZHANG Ye-peng1,2, FAN Zhi-yong2,3
(1.School of Mechanical Engineering, Hubei University of Technology, Wuhan, Hubei 430068;2.Key Lab of Modern Manufacture Quality Engineering, Wuhan, Hubei 430068;3.Hubei Provincial Institute for Food Supervision and Test, Wuhan, Hubei 430068)
Abstract [Objective] The aim was to explore application of LC-IRMS technique in identification of honey adulteration. [Method] We detected 62 honey samples by LC-IRMS, and determined δ13C value of fructose, glucose, disaccharide and trisaccharide of honey. [Result] The difference of maximum and minimum δ13C of fructose, glucose, disaccharide and trisaccharide of true honey was less than 2.1‰, and δ13CFru - δ13CGlu was from -1‰ to 1‰, and there was no oligosaccharides, so 48.38% of samples was no qualified. The adulteration was mainly C-3 plant products and starch syrup, so the monitoring management of adulteration should be strengthened. [Conclusion] LC-IRMS realizes the δ13C isolation and analysis of fructose, glucose, disaccharide and trisaccharide of honey, so it can be used in the adulteration identification of C-3 syrup and can improve the detection capability of honey adulteration.
Key words Liquid chromatography-isotope mass spectrometry (LC-IRMS);Honey;Adulteration;δ13C value
蜂蜜是一種高品質的天然甜味剂,是由蜜蜂从花蜜或蜜露中生产出来的。蜂蜜主要含葡萄糖、果糖和蔗糖,还含有丰富的蛋白质、氨基酸、有机酸及多种维生素和矿物质等,特别含有多种活性酶类,如淀粉酶、蔗糖转化酶、过氧化氢酶和脂酶等。因此,蜂蜜是一种富有营养价值的天然食品[1]。近年来随着人民生活品质的提高,蜂蜜在国内外需求量不断增大。据统计,我国蜂蜜每年的销量远大于产量,蜂蜜掺假掺杂行为确实存在,尤以内销蜂蜜更为严重,且呈不断加重趋势。蜂蜜真实性鉴别成为当前急需解决的技术问题。
目前,测定蜂蜜掺假的主要方法有液相色谱示差折光检测法、薄层色谱法(TLC法)、糖类指纹图谱法、元素分析同位素比值质谱法和离子色谱法等[2]。……