10个不同种类与等级的蜂蜜样品热裂解及其产物的比较分析

Comparison of the pyrolysis products of ten different honeys

组合应用热裂解、冷进样系统和气质联用仪(Py-CIS-GC/MS)对10个不同种类及等级的蜂蜜样品的有氧裂解行为进行了研究.在氧氮混合气体氛围(氧气和氮气按体积比9∶91混合)下,对10个蜂蜜样品在不同裂解温度(900,600,300℃)下的裂解产物挥发性成分进行分析比较,结果表明:①蜂蜜样品在900,600,300℃3个裂解温度下裂解,其共有裂解产物及半数以上样品共有裂解产物个数分别为:900℃,7个和20个,600℃,7个和16个,300℃,4个和6个;3个温度下均裂解出了糠醛、2,3-二氢-3,5-二羟基-6-甲基-4H-吡喃-4-酮、5-(羟甲基)-2-呋喃甲醛、D-阿洛糖4种产物;随着温度的降低,裂解产物个数、质量分减少,但各个温度下各蜂蜜样品主要裂解产物及其在产物中的质量分数差别不大;②3个温度下的裂解产物都以醛类、酮类、糖类以及呋喃、吡喃类物质为主;③部分蜂蜜挥发性成分原形转移进入裂解产物;④冷进样系统对热裂解产物的在线捕集更为完全.

The pyrolysis products of ten different honeys were investigated by pyrolysis -cryo -trap（CIS） - gas chromatography- mass spectrometry （ PY- CIS -GC/MS）. In the nitrogen -oxygen mixture （vlume ratio of nitrogen and oxygen was 9：91 ） ,the volatile pyrolysis products of ten honeys have been analyzed at 300,600 ℃, and 900 ℃ separately. The results showed that：（1） When the honey samples were pyrolized at 900,600 ℃ and 300 ℃, the same pyrolysis products and those pyrolysis products presenced in more than half of the honey samples were respectively ：7 or 20 at 900 ℃ ,7 or 16 at 600 ℃ ,4 or 6 at 300 ℃ .At the three pyrolysis temperatures, all the honey samples have the following four pyrolysis products ： furfura1,2,3 -dihydro -3,5 -dihydroxy -6 - methyl - 4H - pyran - 4 - one ,5 - （hydroxymethyl） - 2 - furancarboxaldehyde, D - allose. The numbers and amounts of the pyrolysis products of honeys decreased with the decreasing of pyrolysis temperature. At each pyrolysis temperature,the main pyrolysis products and their contents have a little difference among the 10 honey samples. （2） At these three pyrolysis temperatures, the main pyrolysis products were aldehydes, ketones, saccharides, furans and pyrans. （3） Several volatile constituents of the honeys transferred directly into pyrolysis products. （4） The pyrolysis - cryo - trap（CIS） can trap on - line more completely.