一种双香豆蒽衍生物的NMR研究

应用核磁共振技术（¹H NMR, ¹3C NMR, DEPT, ¹H-¹H COSY, HSQC, HMBC）,确定了7-(4-溴苯甲基)-7H-吡喃[3,2-c:5,6-c′]二香豆蒽-6,8二酮的结构,排除了其他可能结构, 准确归属了它的¹H, ¹³C信号.      

中药菟丝子中生物活性成分的毛细管电泳-电化学检测

采用毛细管电泳-电化学检测法(CE-ECD)同时测定了菟丝子中芦丁、金丝桃甙、山柰酚、对香豆酸和槲皮素等5种主要生物活性成分的含量,考察了运行缓冲液酸度和浓度、分离电压、氧化电位和进样时间等实验参数对分离检测的影响。在最佳实验条件下,以直径300 μm的碳圆盘电极为工作电极,检测电位为+950 mV(vs. 参比电极),以50 mmol/L的硼砂缓冲溶液(pH 9.0)为运行缓冲液,上述各组分在19 min内能完全分离。芦丁、金丝桃甙、山柰酚、对香豆酸和槲皮素在两个数量级的范围内呈良好线性关系,检测下限(按S/N=3计) 分别为1.93×10-5,3.55×10-4,3.65×10-5,1.73×10-5和1.46×10-4 g/L。该法已成功地应用于菟丝子中活性成分的分离检测,结果令人满意。     

分光光度法定量测定柠檬酸及其盐的含量

酸性介质中,柠檬酸(或盐)与Fe3+形成的黄色络合物在光照条件下发生光致变色现象,生成紫红色络合物,采用分光光度法可定量测定柠檬酸及其盐的含量.在冰水浴中,日光照射20 min,阴凉处静置30 min,检测波长为490nm.线性范围为(0～300)mg/L,相对标准偏差(RSD)为0.46％(n=6),检测限为3.46...     

火焰原子吸收光谱法测定九里香中多种微量元素

九里香样品用浓硝酸消解,采用火焰原子吸收光谱法测定了九里香中的Fe、Zn、Mg、Ca、Cu的含量。结果表明,方法的回收率在94．46％～113．33％,RSD〈2％,该法简便、准确、可信、重现性好。     

含硅香原料研究 Ⅴ.3-三甲硅基环己酮缩酮的合成及结构与香气的关系

三甲硅环己基酮;香气结构关系;含硅香原料研究 Ⅴ.3-三甲硅基环己酮缩酮的合成及结构与香气的关系     

New Sesquiterpenes from Cacalia ainsliaeflora

Two new eremophilane sesquiterpenes, 3β-angeloyloxy-8-oxo-eremophil-6(7)-en-12-oic acid 1 and 3β-angeloyloxy-10β-hydroxy-8-oxo-eremophil-6(7)-en-12-oic acid 2, and a novelnor-eremophilane derivative, 3β-angeloyloxy-10β-hydroxy-8-oxo-eremophil-6(7)-en 3 were isolated from the roots of Cacalia ainsliaeflora. Their structures were elucidated by spectroscopic methods, including 2D NMR.     

基于化学组成及香韵特征双向渐近模拟烟用香精解析及还原方法研究

利用气相色谱/质谱法与基于化学计量学建立的智能辅助调香系统相结合,以香韵特征为辅,对未知香精HNCD005进行解析及还原。在初步定性鉴定的基础上,用外标法定量还原该成品香精的化学成分配比,同时由专业的评香小组从香韵特征的角度对配方进行修饰。仿配香精与未知香精的气相色谱总离子流出图基本一致,化学组成解析准确率为85%,保留时间重现性较好,且二者的整体香韵特征一致,留香时间接近。     

广东干草化学成分的研究

从干草中分离出五个化合物，并分别并鉴定为β－谷甾醇，香豆酸，棕榈酸，木樨草素和柯伊利素。     

Synthesis, Crystal Structure and Luminescent Property of a One-dimensional Europium Citrate Complex

A new compound, [Eu(Hcit)(H2O)2]·H2O]n (1, Hcit3-= C(OH)(COO-)(CH2COO-)2), has been synthesized under hydrothermal reactions of europium oxide, MnCl2·4H2O and citric acid at 120 ℃ for three days. The compound was characterized by single-crystal X-ray diffraction analyses, IR and TGA. Complex 1 crystallizes in monoclinic, space group P21/n with a = 6.179(1), b = 9.688(2), c = 16.990(3) , β = 91.98(3)°, Z = 4, V = 1016.4(3) 3, C6H11EuO10, Mr = 395.11, Dc = 2.582 g/cm3, μ = 6.218 mm-1, F(000) = 760, R = 0.0183 and wR = 0.0411. Single-crystal X-ray analysis reveals that complex 1 displays 1D ladder chains along the a axis, with dinuclear Eu2O2 units serving as "steps" and carboxylate groups as "uprights", which are connected by hydrogen bonds. The solid-state luminescent property of complex 1 was investigated at room temperature. Upon excitation at 394 nm, compound 1 exhibits interesting luminescent properties with several intense bands in the visible region and the most intense and sharp emission being in the red region at 615 nm. The TGA and XRD results prove that complex 1 undergoes facile thermal decomposition to form Eu2O3 at about 870 ℃.     

利用GC -MS结合移动窗口正交投影法及香原料数据库定性混配香精中的复杂成分

使用气相色谱-质谱( GC - MS)对含有表香干扰的混配香精(由5种精油和3种酊剂加入表香中混配而成)的复杂成分进行分析,利用移动窗口特征峰正交投影法,结合使用已建立的香原料物质数据库,快速判别了混配香精中的精油及酊剂等复杂成分,并详细研究了从复杂混配香精中剖析精油、酊剂等复杂成分的影响因素,从而初步提出一种从复杂混...