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| 1 | Determination of spices in food samples by ionic liquid aqueous solution extraction and ion chromatography显示文摘In the present work, a novel method to extract three kinds of spices, namely vanillin, ethyl vanillin and ethyl maltol from food products such as biscuit, chocolate and milk powder was developed. 1-Octyl-3-methylimidazolium chloride([Omim]Cl) aqueous solution was selected as the extracting medium. A 0.5 g powder of food product was extracted by 5.0 mL of [Omim]Cl aqueous solution(0.3 mol/L, pH 6.0) under ultrasonication at 50 8C, and then the extract was centrifuged for 10 min at 4000 rpm. The extract was filtered through a syringe filter and injected into ion chromatography system for analysis. The separation of the three spices was carried out on an anion exchange column. The detection wavelength was set at 280 nm. Compared with traditional extraction solvents, [Omim]Cl aqueous solution displayed particular advantages. The applicability of the proposed method to real sample was confirmed. Under the optimal conditions, good reproducibility of extraction performance was obtained, with the relative standard deviation(RSD) values ranging from 1.9% to 6.3%. The recoveries of spiked samples were between 79.8% and 95.8%. The detection limits(LOD, S/N = 3) of vanillin, ethyl vanillin and ethyl maltol were in the range of 20–45 mg/kg. The use of ionic liquid aqueous solution as extraction solvent was operationally easy and environmental-friendly. | Hai-Bao Zhu Yun-Chang Fan Ya-Ling Qian Hong-Fang Tang Zheng Ruan Dan-Hua Liu Han Wang | 2014 | Chinese Chemical Letters2014，25，3： | 7 |
| 2 | One-pot synthesis of 1,3-thiazolidin-4-one using Bi(SCH_2COOH)_3 as catalyst显示文摘包含芳香的胺的催化多部件反应,芳香的醛,作为底层和双性人(SCH2COOH ) , 3 作为在溶剂下面的催化剂释放的 mercapto 酸调节,在好收益的负担得起的 thiazolidin-4-one。催化剂的效率与许多底层被证明,从对充满电子的醛电子缺乏。 | Naser Foroughifar Sattar Ebrahimi | 2013 | Chinese Chemical Letters2013，24，5： | 2 |
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