An HPLC/MS method for identifying major constituents in the hypocholesterolemic extracts of Chinese medicine formula 'Xue-Fu-Zhu-Yu decoction'

In this paper, HPLC-ESI-MS technique was used to analyze the hypocholesterolemic extracts of 'Xue-Fu-Zhu-Yu decoction', a traditional Chinese medicine consisting of six crude drugs (i.e. Paeonia lactiflora, Ligusticum chuanxiong, Citrus aurantium, Carthamus tinctorius, Prunus persica and Bupleurum falcatum). A total of 17 compounds were identified and their plant derivations were also distinguished. Nine compounds among them were unambiguously determined as oxypaeoniflorin, amygdalin, albiflorin, paeoniflorin, ferulic acid, naringin, hesperidin, senkyunolide I and neohesperidin by comparing the retention times (tR), UV spectra and m/z values with those of the reference compounds. The other eight compounds were tentatively identified as prunasin, 6-hydroxy-kaempferol 3,6-diglucoside, 6-hydroxykaempferol 3-rutinoside-6-glucoside, galloylpaeoniflorin, 6-hydroxy-kaempferol 3-glucoside, anhydrosafflor yellow B, narirutin and kaempferol 3-rutinoside by MS2 spectra and the comparison of their UV spectra and MS spectra with literature data.     

主成分分析在企业经济效益评价中的应用

主成分的概念首先是由Karl parson在1901年引入,后又由Hotelling于1933年将这个概念推广到随机向量,主成分分析是一种将多个指标化为少数互相无关的综合指标的多元统计方法。运用多元统计分析中的主成分分析法,设法将原来众多的具有一定相关性的指标,重新组合成一组新的相互无关的综合指标来代替原来指标。通常数学上的处理是将原来指标作线性组合,从中选取方差最大的作为第一主成分,并结合北京某机械厂几年来生产中经济效益变化状况的相应指标,进行了综合分析,给出了相关的评价。     

洛阳烟区烤烟化学成分特点分析

对在2002-2005年间洛阳地区的70个烤烟样品进行了常规化学成分分析,结果表明:烤烟总氮、钾、氯、淀粉含量基本适宜,还原糖、烟碱、糖/碱、氮/碱、钾/氯等变异范围较大,部分样品烟叶烟碱、还原糖含量偏高;各化学成分间相互比例基本协调,少数烟叶化学成分比例不够协调甚至失衡.     

中华大蟾蜍冬眠期和非冬眠期(活动期)血液成分的比较

采用血常规检验方法,比较了中华大蜍蟾冬眠期和非冬眠期(活动期)的血液成分。结果在冬眠期,红细胞和血红蛋白浓度均有增加。在非冬眠期(活动期)白细胞明显升高。     

α状态离子渗氮层中的氮化物形貌和元素分布

利用离子探针,电子探针等现代测试手段,研究了40Cr,35CrMo和38CrMoAlA钢分别经离子氮化和气体氮化处理后的试样离子氮化层中的氮化物形貌和元素氮、碳、铬、钼、铝的分布,为深入研究α状态渗氮层组织结构与磨损机理,提供了一定的理论依据;同时也为新的氮化钢种的研制和氮化工艺的选择与控制提供了重要信息。     

Two new bismuth salts with succinic acid: synthesis,structural, spectroscopic and thermal characterization

Two novel bismuth succinate hydrates, namely, poly[[diaqua(μ₃-butane-1,4-dicarboxylato)hemi(μ-butane-1,4-dicarboxylato)bismuth] monohydrate], {[Bi(C₄H₄O₄)_1.5(H₂O)₂]·H₂O}_n ( 1 ), and poly[[μ-aqua-aqua(μ₃-butane-1,4-dicarboxylato)(μ-butane-1,4-dicarboxylato)-μ-oxido-dibismuth] monohydrate], {[Bi₂(C₄H₄O₄)₂O(H₂O)₂]·H₂O}_n ( 2 ), have been synthesized. Their crystal structures were determined by single-crystal X-ray diffraction and the compounds were characterized by IR and Raman spectroscopy, powder X-ray diffraction and thermal analysis. The crystal structure analysis revealed that the compounds are coordination polymers, with 1 having a two-dimensional layered structure and 2 displaying a three-dimensional (3D) framework. Fully deprotonated succinate anions (C₄H₄O₄²⁻) in two different conformations (trans and gauche) are included in their composition. The Bi³⁺ cations are surrounded by O atoms from the carboxylate groups of succinate anions and aqua ligands. BiO₉ coordination polyhedra in 1 are connected in pairs by edges. These pairs are bound together by bridging succinate ligands to form layers. Bismuth coordination polyhedra of two different types (BiO₉ and BiO₇) in 2 are connected by edges to form infinite ribbons. Ribbons of polyhedra with bridging succinate ligands form a 3D polymeric structure.     

气态环己烷催化氧化制丁二酸酐的研究─纳米催化剂活性组分对目标反应的影响

本文以气态环己烷催化氧化制丁二酸酐为目标反应,对TiO2-A l2O3纳米复合载体上的添加组分进行了研究与探索.结果表明,实验条件下,活性最好的催化剂添加物组成为:V2O5负载量为载体质量的5.0%,P与V原子个数比为1.5,催化剂中Mo、Sb、K的质量百分含量分别为1.25%、0.6%、4.0%.