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[求助]
糖浆特征物分析（主要针对蜂蜜掺假，小麦糖浆和木薯糖浆），求教！ 已有1人参与
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| 我是检测关于蜂蜜掺假的，对于新的糖浆，需要找出其特征物，进液质，发现峰分不开，出峰时间才2分钟左右，如何可以把峰分开，希望可以给些建议，谢谢！ |
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lifucheng
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2楼2014-01-12 20:10:00
3楼2014-03-27 22:24:10
skychen001
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4楼2014-03-30 22:40:28
celan
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从事NMR和有机结构鉴定40余年
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Honey carbohydrates were analyzed by high performance anion exchange liquid chromatography with constant potential amperometric detection at a nickel-chromium (80:20) alloy electrode. The sugars are oxidized by a surface catalyzed process proposed to involve Ni(II)/Ni(III) oxyhydroxides, which are formed at approximately 0.500 V (Saturated Calomel as reference electrode). The honey content of glucose, fructose, and sucrose is determined in less than 15 minutes per sample. The high sensibility achieved with this alloy electrode allowed for the analysis of disaccharides and oligosaccharides usually present in honey as minor components. The analysis of these carbohydrates may be useful for the determination of the floral origin of honey. |
5楼2014-04-18 08:46:00
celan
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从事NMR和有机结构鉴定40余年
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DETERMINATION OF SUGAR COMPOSITION IN PORTUGUESE HEATHER HONEYS BY HPLC/RI HPLC analysis of sugars The HPLC method of AOAC (1990) [10] was followed except that acetonitrile-water mobile phase and solvent flow rate used were 80/20 and 1.5 ml/min., respectively, to improve the separation of the individual sugars on the column. Thus, separation of compounds was achieved with an analytical HPLC unit (Gilson), using an refractive index detector and an μ-Bondapak/Carbohydrate (300x4 mm I.D., Waters Associates, nº84038) column. A 20 μl portion of each prepared honey sample was injected and the sugars content was calculated by external standard method using peak areas. A 20 μl aliquot of the mixed sugars standard was injected in duplicate at the beginning, during, and at the end of each day’s run to check retention time and peak area. http://www.apimondia.com/congresses/2001/Papers/080.pdf |
6楼2014-04-18 08:49:59
winder1998
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7楼2017-06-14 15:59:41