小红参中蒽醌苷的分离和鉴定

云南普米族常用活血药茜草科小红参(Rubia yunnanensis)的根部水溶性部分曾用于治疗心绞痛。王淑仙等发现,它对小鼠能明     

千里光中几种黄酮和酚酸类成分的分离与鉴定

对千里光(Senecio scandens Buch.-Ham.)全草的乙酸乙酯提取部位进一步分离,得到4个黄酮类化合物和2个酚酸类化合物,经理化性质和NMR及MS谱学数据鉴定分别为槲皮素3-O-β-D-葡萄糖苷（Ⅰ）、金丝桃苷（Ⅱ）、槲皮素（Ⅴ）、异鼠李素（Ⅵ）、绿原酸（Ⅲ）和咖啡酸（Ⅳ）。 其中化合物Ⅰ~Ⅵ均为首次从千里光属植物中分离鉴定。     

中药大黄中羟基蒽醌类成分的分离

依据正交试验设计方法，研究了用乙醇和乙醚等溶剂分离中药大黄中羟基蒽醌类成分（蒽甙及游离羟基蒽醌类成分）及游离羟基蒽醌类成分的最佳分离条件，试验表明，乙醇的用量及回流次数对提取产率有很大影响，而回流时间的影响相对较小，100g大黄干粉的最佳分离条件是：用90mL95%乙醇浸润，再用150－175ml乙醇回流，回流3次，每次30－40min，即可较充分发将羟基蒽醌类成分总量的84％及游离羟基蒽醌类成分总量的82％提取出来。     

植物生长调节剂调吡脲的合成及其副产物的分离和结构鉴定

调吡脲 (Ｆｏｒｃｈｌｏｒｆｅｎｕｒｏｎ ,Ａ) ,代号ＫＴ 30 ,化学名Ｎ ( 2 氯 4 吡啶基 ) Ｎ 苯基脲 ,是一种新型植物生长调节剂 ,具有非常高的细胞激动活性 ,有促进细胞生长、分化作用 ,可以防止植物老化 ,促进苗条形成及果实肥大。对水果果实和烟草叶片等都有促进肥大作用[1 ,2 ] ;对土豆、棉花和甘蔗等农作物也有增产作用。我们参照有关文献[3] 合成了调吡脲 (Ａ)。合成路线如图 1所示。图 1　调吡脲的合成路线Ｆｉｇ .1　Ｓｙｎｔｈｅｔｉｃｒｏｕｔｅｏｆｆｏｒｃｈｌｏｒｆｅｎｕｒｏｎ　　合成中 ,吡啶用双氧水进行Ｎ 氧化 ,再…     

高效液相色谱法对手性药物罗格列酮与吡格列酮的拆分

采用高效液相色谱法,在多糖类手性固定相Chiralpak IC上成功拆分了2种降糖类手性药物罗格列酮与吡格列酮,考察了流动相、流速、温度、酸碱添加剂等对手性分离的影响.以正己烷-异丙醇(70:30,体积比)为流动相,在流速1.0 mL/min、检测波长254 nm、柱温35 ℃的条件下,罗格列酮与吡格列酮均得到良好分离,选择因子(α)分别为1.29、1.22,分离度(Rs)分别为7.07、5.56;该法不仅适用于此类手性药物的生产及质量控制,同时还可应用于对映体制备.     

超高效液相色谱-串联质谱法测定果蔬中胺苯吡菌酮残留量

建立了一种超高效液相色谱-串联质谱(UPLC-MS/MS)法分析蔬菜和水果中胺苯吡菌酮残留量。用乙腈提取样品中残留的胺苯吡菌酮,提取液经十八烷基硅胶键合相(C18)和乙二胺-N-丙基硅烷(PSA)混合净化剂净化,使用UPLC-MS/MS电喷雾离子化、正离子扫描和多反应监测(MRM)模式检测,基质匹配标准溶液外标法定量。结果表明,胺苯吡菌酮在0.05～10μg/L范围线性关系良好,相关系数不低于0.9993。在0.1～2000μg/kg范围内,对黄瓜、菠菜、苹果、葡萄和洋葱样品进行添加回收率实验,平均回收率为81.2%～104.3%,相对标准偏差为2.2%～16%,方法的定量限为55 ng/kg,检出限为5.5 ng/kg。本研究建立的方法能对蔬果中胺苯吡菌酮残留量进行准确的定性和定量分析。     

双苯并异硒唑酮及其类似物的合成与表征

以Ebselen为先导化合物,合成了7种双苯并异硒唑酮结构的新型Ebselen类似物,其结构经^1H NMR,IR和MS表征。     

人参茎叶挥发油中含氧化合物的分离与结构鉴定

组成鉴定;人参茎叶挥发油中含氧化合物的分离与结构鉴定     

某些酸性三苯甲烷染料与盐酸吡格列酮相互作用的分子光谱特点及其分析应用

溴甲酚绿;氯酚红;酚红;溴甲酚紫;盐酸吡格列酮;分光光度法     

A novel xanthone dimer derivative with antibacterial activity isolated from the bark of Garcinia mangostana

A novel xanthone dimer derivative, garmoxanthone (1), together with 10 known compounds (2–11), were isolated from bark of Garcinia mangostana. Their structures were established through spectroscopic methods. Garmoxanthone exhibited strong inhibitory activities against MRSA ATCC 43300 and MRSA CGMCC 1.12409 (with MIC values of both 3.9 μg/mL) and moderate activities against tested strains of Vibrio (with MIC values ranging from 15.6 to 31.2 μg/mL). Garmoxanthone is a unique xanthone dimer with linkage of a fused 5/6 ring system and its absolute configuration was elucidated on the basis of experimental and calculated electronic circular dichroism. Garmoxanthone exhibited strong antibacterial activity which partially validated the ethnobotanical use of G. mangostana in the treatment of infections.     

Two new xanthones from the pericarp of Garcinia mangostana

Two new xanthones, designated garcimangosxanthone F (1) and garcimangosxanthone G (2), were isolated from the EtOAc-soluble fraction of ethanolic extract from the pericarp of Garcinia mangostana. Their structures were established as 1,6,7-trihydroxy-5-(3-methylbut-2-enyl)-8-(3-hydroxy-3-methylbutyl)-6′,6′-dimethylpyrano[2′,3′:3,2]xanthone and 1,6,7-trihydroxy-5-(3-methylbut-2-enyl)-8-(3-hydroxy-3-methylbutyl)-6′,6′-dimethyl-4′,5′-dihydropyrano[2′,3′:3,2]xanthone, respectively, on the basis of their 1D, 2D NMR and MS data interpretation.     

人面果树皮中口 山 酮 化合物及其DPPH自由基的清除活性

从人面果乙酸乙酯提取物中分离出5个新的口 山 酮 化合物garcinenone A (1), B (3), C (4), D (7) and E (8)和7个已知化合物,其结构经过波谱技术,特别是2D-NMR技术来鉴定。Jacareubin (2), 1,4,6-trihydroxy-5-methoxy-7-(3-methyl-2-buteny1)xanthone (6), subeliptenone B (11) 和symphoxanthone (12)为首次从该植物中分离出来。在DPPH自由基的清除活性实验中,所有的化合物都显示抗氧化活性,其IC50的值在 6.0-23.2 mM。结果表明人面果是潜在的有前景的天然抗氧化剂。     

山竹果皮中两种杂氧蒽酮化学成分的分析研究

建立了山竹果皮中杂氧蒽酮类化合物的快速提取、分离、鉴定方法。以无水乙醇为夹带剂,应用超临界萃取技术对山竹果皮中的杂氧蒽酮类活性化合物进行提取,快速制备色谱装置Isolera One对粗提物进行分离,得到2种杂氧蒽酮化合物,经质谱鉴定其为α-倒捻子素(α-Mangostin)和Gartanin,两者经高效液相色谱检测纯度均不低于90%,并辅以电喷雾多级串联质谱对两种化合物的碎裂规律进行了研究。     

Isolation and Crystal Structure of Xanthones from Swertia Chirayita

1 INTRODUCTION Swertia chirayita (Buch.-Ham.) grows abundantly in the temperate regions of Himalayas. It is used in Tibetan folk medicine as the traditional remedy for chronic fever, anaemia, asthma, liver disorders, hepatitis and stomachic. Recently, th…     

Two New Prenylated Xanthones from the Pericarp of Garcinia mangostana (Mangosteen)

Two new prenylated xanthones (=9H‐xanthen‐9‐ones), garcimangosxanthones D ( 1 ) and E ( 2 ), together with the six known xanthones 3 – 8 , were isolated from the pericarp of Garcinia mangostana. Their structures were determined by analysis of their spectroscopic data. All of the isolated compounds were biologically evaluated for their in vitro cytotoxic activity against A549, Hep‐G2, and MCF‐7 human‐cancer cell lines and antioxidant activity. Compound 1 exhibited moderate cytotoxicity against Hep‐G2 (IC₅₀=19.2 μM ) and weak cytotoxicity against MCF‐7 (IC₅₀=62.8 μM ) cell lines, and compound 2 showed moderate cytotoxicity against A549, Hep‐G2, and MCF‐7 cell lines with IC₅₀ values of 12.5–20.0 μM (Table 2). Both compounds 1 and 2 demonstrated a weak antioxidant activity with ferric reducing antioxidant power (FRAP) values of 41±7 and 130±4 μmol/g, respectively (Table 3).     

Xanthones from the bark of Garcinia Xanthochymus

Two novel xanthones, 1,6-dihydroxy-4,5-dimethoxyxanthone (1) and 1,5,6-trihydroxy-7,8-di(3-methyl-2-butenyl)-60,60- dimethylpyrano(20,30:3,4)xanthone (2) were isolated from the bark of Garcinia xanthochymus by normal phase and reverse phase silica gel column chromatography. Their structures were elucidated by spectroscopic methods, especially 2D-NMR techniques.     

黄花菜中黄酮的超声波提取、纯化及鉴定

用正交实验法对黄花菜中黄酮的超声波提取工艺中的超声功率、样品细度、固液比例、提取时间4个因素进行了研究,优选出简便可靠的黄酮提取工艺。其最佳提取工艺条件是:黄花菜过60目筛后,超声波功率为高档,固液比为1:10,提取为20 min。通过红外光谱、紫外光谱、色谱分析可以确定黄花菜中的黄酮是黄酮醇类黄酮。     

Two Unusual Xanthones from the Bark of Garcinia xanthochymus

A new xanthone derivative, garcinexanthone F ( 1 ), which was found to possess an α,β‐unsaturated γ‐lactone moiety, and a new bisxanthone, bigarcinenone B ( 2 ), with a terpene bridge providing the xanthone? xanthone linkage, were isolated from the bark of Garcinia xanthochymus. Their structures were elucidated by spectroscopic methods, especially 2D‐NMR techniques. The antioxidant assay in vitro showed that compounds 1 and 2 exhibited significant scavenging activities against 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH) radical with IC₅₀ values of 22.32 and 20.14 μM , and against HO^. radical with IC₅₀ values of 1.16 and 2.85 μM , respectively.