Synthesis of unsaturated polyesters of increased solubility in styrene

The present study presents the synthesis of unsaturated polyester resins using only one glycol i.e., ethylene glycol. Polyesters of inorganic solubility in styrene were prepared. Properties of the resins in the noncrosslinked state in the process of crosslinking and after curing were studied. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 3143–3150, 2006     

A Study on NMR and GC/MS Spectra of the Isomers of Linear Hexyl Naphthalene

The GC/MS and NMR analysis of the reaction products of naphthalene with 1-bromohexane were reported. The products obtained were suggested to have six isomers of linear hexylnaphthalene and the structure of each isomer was determined by GC/MS and NMR spectra. For the first time, the unique chemical shift data were obtained. The content of each isomer calculated by ¹H NMR and ¹³C NMR spectra was consistent with that by GC/MS spectra, which confirmed the accuracy of NMR data.     

人参皂苷Rg分子轨道微扰理论的研究

人参皂苷Rg是具有生理活性的物质，它包括三个异构体：Rg1；Rg2；Rg3其中R83具有很强的抗癌作用。本文通过休克尔分子图形理论对Rg异构体的各分子轨道进行约化，并且根据分子轨道微扰理论求出它们不同本征多项式和本征值。     

对环氧丁烷异构体定性分析的探讨

通过用标样、GC／MS、利用化合物的沸点规律和I值增量等方法，对环氧丁烷异构体进行全面的定性分析。同时在鲨鱼烷毛细管柱上分别于3个柱温下，测出了各组分的Kovats保留指数，找出了各组分保留指数与柱温的规律。     

日光照射对荧光增白剂VBL顺-反异构现象影响的研究

用紫外光谱和荧光光谱法对日光照射荧光增白剂VBL溶液进行了研究。结果表明、随日光照射时间的延长，VBL溶液在432nm处荧光强度下降；而在267nm处有所增强，低浓度溶液对日光照射更加敏感。1mg／1在避光时测得吸光度为0.449，而在日光照射15分钟后，其吸光度下降至0.141，证明日光照射使VBL溶液中的顺式异构体增加。     

1,2,4-三氮唑类杀菌剂的研究进展

综述了1，2，4－三氮唑类杀菌剂的开发现状和研究进展，对其光学异构体的制备，构效关系及其分离等进行了讨论，指出1，2，4－三氮唑类杀菌剂具有高效、广谱、低毒、低抗性等特点，发展前景好。     

二甲苯异构体的分离技术

论述了采用吸附分离技术分离二甲苯异构体．     

氟苯尼考不对称催化合成分析及研究

以D-苏式-2-氨基-1-[对-甲砜基(苯基)]-1，3-丙二醇为起始原料，与二氯乙腈进行不对称催化合成，在手性有机锌、YH-3催化剂作用下进行合成、结构转化，减少了副产物生成，是合成氟苯尼考新工艺的探讨。     

异丙隆及其间位异构体、邻位异构体分析方法研究

采用高效液相色谱和气相色谱相结合,对异丙隆及其间位异构体、邻位异构体进行分离和测定。试验结果表明:异丙隆线性相关系数为0.996 1,相对标准偏差为0.19%,平均回收率为100.11%;间位异构体线性相关系数为0.995 9,相对标准偏差为2.26%,平均回收率为97.05%;邻位异构体线性相关系数为0.992 5,相对标准偏差为5.02%,平均回收率为97.61%。     

Effects of light-emitting diode illumination on the quality of fresh-cut cherry tomatoes during refrigerated storage

The effects of light-emitting diode (LED) illumination on the quality of fresh-cut cherry tomatoes were investigated. Tomatoes were exposed continuously to red, green, blue and white LED light for 7 days and control samples stored in darkness. Results showed that blue light treatment significantly led to more total soluble solids, lycopene concentration and individual phenolic compounds (chlorogenic acid, caffeic acid, rutin) after 7 days of storage. On day-5, green and blue light-treated tomatoes showed relatively higher firmness than samples treated by other lights and the control. At the early stage of storage, blue light could preserve the fresh flavour of tomatoes compared to other treatments. Overall, the blue light was most effective in the quality preservation of fresh-cut cherry tomatoes and could be used as a novel strategy in the preservation of fresh-cut fruits and vegetables during shelf life.