Fixed-Bed Column Adsorption Modeling of MnO4- Ions from Acidic Aqueous Solutions on Activated Carbons Prepared with the Biomass

Activated carbons calcined at 400˚C and 600˚C (AC-400 and AC-600), prepared using palm nuts, collected in the town of Franceville in Gabon, were used to study the dynamic adsorption of MnO4- ions in acidic media on fixed bed column and on the kinetic modeling of experimental data of breakthrough curves of MnO4- ions obtained. Results on the adsorption of MnO4- ions in fixed-bed dynamics obtained on AC-400 and AC-600 adsorbents beds indicated that the AC-400 bed appears to be the most efficient in removing MnO4- ions in acidic media. Indeed, the adsorbed amounts, the adsorbed capacities at saturation and the elimination percentage of MnO4- ions obtained with AC-400 (31.24 mg;52.06 mg·g-1 and 41.65% respectively) were higher compared to those obtained with AC-600 (9.87 mg;16.45 mg·g-1 and 17.79% respectively). The breakthrough curves kinetic modeling revealed that the Thomas model and the pseudo-first-order kinetic model were the most suitable models to describe the adsorption of MnO4- ions on adsorbents studied in our experimental conditions. The results of the intraparticle diffusion model showed that intraparticle diffusion was involved in the adsorption mechanism of MnO4- ions on investigated adsorbents and was not the limiting step and the only process controlling MnO4- ions adsorption. In contrast to AC-400, the intraparticle diffusion on AC-600 bed plays an important role in the adsorption mechanism of MnO4- ions.

Hydrothermal Syntheses and Crystal Structures of Six Complexes Constructed from 1,3,5-Benzenetricarboxylic Acid and 4'-(4-Pyridyl)-2,2':6',2''-terpyridine Mixed Ligands

Six new transition metal complexes, [Zn（HBTC）（PYTPY）]n·n PYTPY（1）, [Cu（HBTC）（PYTPY）]n·n PYTPY（2）, [Co（HBTC）（PYTPY）]n·n DMF（3）, [Mn（HBTC）（PYTPY）]n·n DMF（4）, [Cd（HBTC）（PYTPY）（H2O）]n·2nH2O（5）, and [Co（HBTC）（PYTPY）（H2O）2]（6）,（H3BTC = 1,3,5-benzenetricarboxylic acid, PYTPY = 4＇-（4-pyridyl）-2,2＇：6＇,2＇＇-terpyridine, DMF = N,N？-dimethylformamide）, have been synthesized and characterized by elemental analysis, IR and X-ray single-crystal diffraction. Complexes 1~5 all feature one-dimensional chain structures, and complex 6 exhibits a zero-dimensional structure. Complexes 1~5 present three-dimensional（3D） supramolecular frameworks via π-π stacking interactions, whenas 6 has also a 3D supramolecular structure assembled by hydrogen bonding. Meanwhile, complexes 1 ~ 6 exhibit the thermal stabilities and photoluminescent properties.

Syntheses, Structures and Photoluminescence of the Cadmium(Ⅱ) and Copper(Ⅱ) Complexes Based on 4'-(4''-Pyridyl)-2,2':6',2''-terpyridine and 1,4-Benzenedicarboxylic Acid Ligands

Two new metal-organic complexes [Cd2（1,4-BDC）（4-pytyp）（H2O）4]·（1,4-BDC）（1） and [Cu2（1,4-BDC）（4-pytyp）2（H2O）2]·（1,4-BDC）·8H2O（2）（4-pytyp = 4＇-（4＇＇-pyridyl）-2,2＇：6＇,2＇＇-terpyridine, 1,4-H2 BDC = 1,4-benzenedicarboxylic acid） have been synthesized under hydrothermal conditions and characterized by elemental analysis, infrared analysis and X-ray single-crystal diffraction. The scrutiny of single-crystal structure reveals that complex 1 forms to a 3D supramolecular network linked by π-π stacking interactions and hydrogen bonds. X-ray diffraction analysis reveals that complex 2 exhibits a 3D supramolecular network linked through complicated hydrogen bonds. The thermogravimetric analysis and photoluminescent properties of 1 and 2 are discussed in detail.

A One-dimensional Cd(Ⅱ)Coordination Polymer Constructed from 1,4-Benzene-dicarboxylic Acid and 3-(2,6-Di(pyrazin-2-yl)pyridin-4-yl)-1H-indole:Synthesis,Structure and Photoluminescence

A new coordination polymer {[Cd（C_（21）H_（14）N_6）（C_8H_4O_4）]·H_2O}_n（1） was synthesized by an elaborate design via the reaction of 3-（2,6-di（pyrazin-2-yl）pyridin-4-yl）-1H-indole（bppi）,1,4-benzene-dicarboxylic acid（H2bdc） and cadmium（Ⅱ） nitrate in CH_3OH/H_2O mixed solvents. Complex 1 crystallizes in orthorhombic,space group Ccca with a = 20.012（4）,b = 31.881（6）,c = 19.808（4） ？,V = 12638（4） ？~3,Z = 16,C_（29）H_（20）CdN_6O_5,M_r = 644.91,D_c = 1.356 g·cm^（-3）,μ = 0.735 mm^（-1）,F（000） = 5184,GOOF = 1.046,the final R = 0.0405 and wR = 0.1063 for 6870 observed reflections（I 〉 2σ（I））. The Cd（Ⅱ） centre is hepta-coordinated by three N and four O atoms from one bppi terminal ligand and two bdc2– ligands,respectively,displaying a capped trigonal prism geometry. Structure extension gives coordination polymeric chains,in which the bdc2– linkers connect Cd（Ⅱ） cations into a one-dimensional（1D） coordination polymer along the c axis,giving zigzag chains with the Cd···Cd separation of 11.178（1） ？. The adjacent bppi terminal ligands in the chains are anti-periplanar conformation. The three-dimensional（3D） structure is stabilized by π···π stacking and hydrogen-bonding interactions to form a supramolecular self-penetrating network with 1D channels. In 1,there are voids 2999.7 ？~3 with 23.7% of per unit cell volume. Thermal analysis indicates that the framework of 1 is stable until 651 K and the photoluminescence of 1 in the solid shows very weak fluorescence at 382 and 560 nm upon excitation at 310 nm.

Synthesis of (2S,4S)-2-Substituted-3- (3-Sulfanylpropanoyl)-6- Oxohexahydropyrimidine-4-Carboxylic Acids as Potential Antihypertensive Drugs

Proceeding from natural amino acid L-asparagine and commercially available aldehydes a stereoselective synthesis was developed of (2S,4S)-2-alkyl(aryl)-3-(3-sulfanylpropanoyl)-6-oxohexahy- dropyrimidine-4-carboxylic acids, potential antihypertensive drugs, inhibitors of the angiotensin converting enzyme.

Crystal and Molecular Structure, and Spectral Characteristics of Sodium 3,5-Bis(Hydroxyimino)-1-Methyl-2,4,6-Trioxocyclohexanide

Sodium 3,5-bis(hydroxyimino)-1-methyl-2,4,6-trioxocyclohexanide C7H5N2NaO5 (I) has been isolated as the only product of the reaction of nitrosation of methylphloroglucinol. The structure of the titled compound has been determined from single crystal X-ray diffraction data. The hydrated C7H5N2NaO52.5H2O crystallizes in the monoclinic space group C2/c, with a(?) 16.408(3);b(?) 12.446(3);c(?) 13.716(3);(o) 126.34(3). The planar organic anion exists in a triketo-dihydroxyimino form with the C–O and C–N distances from 1.220(2) to 1.271(2)?? and from 1.292(2) to 1.293?? respectively. In the IR spectrum of I, the sharp absorption band occurred at 1681 cm-1 due to C=O stretching indicating the strong H-interactions. The correlations of theoretical (DFT-B3LYP/aug-cc-pVDZ) and experimental UV-vis absorption spectra in neutral and alkaline ethanolic solutions showed the existence of hydroxyimino-nitroso tautomerism while ionization of I.

2-(1-氨基-8-萘酚-3,6-二磺酸钠)-4,6-二氯-1,3,5-三嗪改性微晶纤维素的制备与水解

合成了2-(1-氨基-8-萘酚-3,6-二磺酸钠)-4,6-二氯-1,3,5-三嗪(SHACT),用于微晶纤维素(MCC)的改性,研究了改性纤维素的结构与水解性能的关系。以三聚氯氰(TCT)、1-氨基-8-萘酚-3,6-二磺酸单钠为原料,合成SHACT;将SHACT用于微晶纤维素的修饰,用FT-IR表征其接枝效果,并通过WAXD分析改性后纤维素的结晶结构;并将修饰后的微晶纤维素于130℃、固液比为1∶20的条件下用8%(wt,质量分数,下同)H_2SO_4水解5h,研究SHACT的用量对纤维素微晶结构和水解性能的影响。实验结果表明,经SHACT改性后,微晶纤维素的结晶结构发生了变化:无定形区含量增加,结晶指数下降,晶粒尺寸减小;微晶纤维素水解后还原糖的得率有所提高,当SHACT相对摩尔含量为4.76%时,微晶纤维素水解后还原糖的得率最大(9.71%)。

植物乳杆菌对2,4,6-三硝基苯磺酸诱导的小鼠结肠炎的治疗作用

目的:评估益生菌植物乳杆菌(LP)对三硝基苯磺酸(TNBS)诱导小鼠肠道炎症损伤的治疗作用,并探讨其可能的作用机制.方法:将成年♀Balb/c小鼠随机分成3组:正常对照组(Control组),TNBS灌肠诱导小鼠结肠炎组(TNBS组)和LP干预组(TNBS+LP组).TNBS诱导肠炎模型建立后,给予TNBS+LP组小鼠灌胃LP3wk,其余两组灌胃空白对照PBS液.实验结束后对大鼠一般情况、结肠大体损伤及组织学损伤进行评估,并对各组小鼠结肠组织髓过氧化物酶(MPO)活性、LTB4含量及促炎细胞因子TNF-α和IFN-γ的表达进行测定.结果:与TNBS诱导的TNBS组相比,LP明显减轻了TNBS诱导的小鼠结肠炎症,表现为疾病活动指数下降(3.37±0.36vs0.97±0.47,P<0.05),结肠大体和组织学评分显著降低(1.11±0.61vs4.62±0.40;1.48±0.40vs5.39±1.12,均P<0.05),且LP显著降低了TNBS诱导的小鼠结肠黏膜内中性粒细胞浸润,这与MPO活性降低相一致(25.14U/g±5.22U/gvs90.3U/g±7.70U/g,P<0.05).此外,LP明显降低了TNBS诱导的小鼠结肠内具有化学趋化活性的LTB4含量(3.13ng/g±0.10ng/gvs8.43ng/g±0.49ng/g,P<0.05)和增加了促炎细胞因子TNF-α和IFN-γ的表达(205ng/g±68ng/gvs375ng/g±79ng/g;446ng/g±116ng/gvs603ng/g±109ng/g,均P<0.05).结论:口服植物乳杆菌能有效缓解TNBS诱导的小鼠结肠炎症状,其作用机制可能与其降低白细胞聚集及促炎细胞因子的表达有关.

缚酸剂对合成2,2′-亚甲基双(4,6-二叔丁基苯基)磷酰氯的影响

以2,2′-亚甲基双(4,6-二叔丁基)苯酚(简称双酚)和三氯氧磷为原料,乙腈为溶剂,合成聚丙烯成核剂NA-11(2,2′-亚甲基双(4,6-二叔丁基苯基)磷酸钠)的中间体2,2′-亚甲基双(4,6-二叔丁基苯基)磷酰氯。考察了缚酸剂的种类、用量、加入方式及三氯氧磷滴加温度等因素对产物收率和性状的影响。实验结果表明,在以二异丙基乙胺为缚酸剂,双酚与二异丙基乙胺的摩尔比为1∶2.65,先加入60%(w)的二异丙基乙胺,剩余二异丙基乙胺与三氯氧磷在20℃下同时滴加,25℃下反应1 h的条件下,2,2′-亚甲基双(4,6-二叔丁基)磷酰氯收率为90.2%,纯度可达99.2%(w)。以此原料制备的NA-11的HPLC纯度达99.8%以上,色度可达优级标准。

Crystal Structure and Biological Activities of (R)-N′-[2-(4-Methoxy-6-chloro)-pyrimidinyl]-N-[3-methyl-2-(4-chlorophenyl)butyryl]-urea

The title compound （R）-N′-[2-（4-methoxy-6-chloro）-pyrimidyl]-N-[3-methyl-2-（4- chlorophenyl）butyryl]-urea has been synthesized, and its crystal structure and biological behaviors were studied. Crystallographic data： C17H18C12N4O3, Mr = 397.25, monoclinic, space group P21/c, a = 12.331（2）, b = 14.025（3）, c = 23.085（5） A, β = 99.607（4）°, Z = 8, V = 3936.2（13） A3, Dc = 1.341 g/cm^3, F（000） = 1648, R = 0.0718, wR = 0.1585 and/t（MoKα） = 0.353 mm^-1. The preliminary biological tests showed that the title compound has definite insecticidal and fungicidal activities.

A Facile Synthesis of 9,10-Dimethoxybenzo[6,7]- ox-epino[3,4-<i>b</i>]quinolin-13(6<i>H</i>)-one and Its Derivatives

A concise and efficient method for the synthesis of novel 9,10-imethoxybenzo[6,7]oxepino[3,4-b]quinolin13(6H)-one and its derivatives 7a-p has been developed via the intramolecular Friedel-Crafts acylation reactions of 6,7-dimethoxy-2-(phenoxymethyl)quinoline-3-carboxylic acids 6a-p with polyphosphoric acid (PPA) as catalyst and solvent under mild conditions. The key intermediates 6a-p were prepared through the in situ formation of ethyl 6,7-dimethoxy-2-(phenoxymethyl)quinoline-3-carboxylates 5a-p followed by hydrolysis with aqueous ethanolic sodium hydroxide solution. The novel synthetic method has the advantages of good yields, easy work-up, and environmentally friendly character, which may provide a novel highly efficient process for making quinoline and related azaheterocycle libraries.

Effect of Temperature on the Reaction of 2-(N-acetylamine)-3-(3,5-di-<i>tert</i>-butyl-4-hydroxyphenyl)-propionic Acid with Oxygen in an Alkaline Condition

Results of oxidation 2-(N-acetylamine)-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionic acid oxygen depend on temperature. At 55℃?- 60℃, 2,4-di-tert-butylbicyclo(4,3,1)deca-4,6-dien-8-(N-acetylamine)-3,9-dion-1-oxa is formed. The constitution is based on dates of spectrums 1Н and 13С NMR. At 95℃?- 97℃, mixtures of 2,4-di-tert-butylbicyclo(4,3,1)deca-4,6-dien-8-(N-acetylamine)-3,9-dion-1-oxa and of 6,8-di-tert-butyl-3-(N-acetylamine)spiro(4,5)deca-1-oxa-5,8-dien-2,7-dione are produced. Structures are calculated by the method of Hartrii-Foka. Values of enthalpies and of entropies allow to assume dynamic isomerism.

十一至十五碳二元酸二(2，2，6，6-四甲基哌啶基)酯的合成及其光稳定性研究

以甲醇钠为催化剂,无水二甲苯为溶剂,采用4A分子筛脱醇脱水,以长链二元酸二甲酯(LDDE)和2, 2,6,6-四甲基哌啶醇(TMPO)为原料制备了十一至十五碳系列二元酸二(2,2,6,6-四甲基哌啶基)酯。通过正交实验确定的最佳工艺条件为:反应时间8 h,n(TMPO):n(LDDE)=4:1,催化剂用量为LDDE质量的0.8%。该产物可明显改善加氢基础油的光稳定性能。

荧光光谱法研究羟基葫芦[6]脲与二苯胺磺酸钠的分子识别作用

采用荧光光谱法研究了羟基葫芦[6]脲(HOCB6)与二苯胺磺酸钠(DPS)之间的相互作用,考察了溶液的pH值、常见有机溶剂和表面活性剂等对该包结物的形成及荧光强度的影响。实验结果表明主客体分子之间通过氢键作用和亲水性端口效应形成了1:1型的HOCB6-DPS外式包结物,其包结常数为1.25×103L.mol-1。同时采用其母体葫芦[6]脲(CB6)进行比较研究。研究发现,CB6与DPS也通过类似方式形成1:1型的外式包结物,其包结常数为2.80×102L.mol-1。但与HOCB6使DPS荧光峰略有蓝移不同,CB6使DPS的荧光峰明显蓝移,说明葫芦脲腔体周围引入的十二个羟基能改变葫芦脲的分子识别能力,导致上述光谱的变化和包结常数存在差别。

Probiotic yeasts: Anti-inflammatory potential of various non-pathogenic strains in experimental colitis in mice

AIM: To evaluate the in vitro immunomodulation capacity of various non-pathogenic yeast strains and to investigate the ability of some of these food grade yeasts to prevent experimental colitis in mice.METHODS: In vitro immunomodulation was assessed by measuring cytokines [interleukin (IL)-12p70,IL-10,tumor necrosis factor and interferon γ] released by human peripheral blood mononuclear cells after 24 h stimulation with 6 live yeast strains (Saccharomyces ssp.) and with bacterial reference strains.A murine model of acute 2-4-6-trinitrobenzene sulfonic acid (TNBS)-colitis was next used to evaluate the distinct prophylactic protective capacities of three yeast strains compared with the performance of prednisolone treatment.RESULTS: The six yeast strains all showed similar non-discriminating anti-inflammatory potential when tested on immunocompetent cells in vitro .However,although they exhibited similar colonization patterns in vivo ,some yeast strains showed significant anti-inflammatory activities in the TNBS-induced colitis model,whereas others had weaker or no preventive effect at all,as evidenced by colitis markers (body-weight loss,macroscopic and histological scores,myeloperoxidase activities and blood inflammatory markers).CONCLUSION: A careful selection of strains is required among the biodiversity of yeasts for specific clinical studies,including applications in inflammatory bowel disease and other therapeutic uses.

国产荧光素钠注射液中杂质的检测及结构鉴定

目的对国产荧光素钠注射液中的杂质进行分离及结构鉴定。方法采用RP HPLC法对荧光素钠注射液进行成分分析并用硅胶柱色谱法对主要杂质进行分离,根据质谱和核磁共振谱数据进行结构鉴定。结果和结论荧光素钠注射液中含有6羟基7磺酸基9(邻羧基苯基)3H口占吨3酮、6羟基9(邻乙氧基羰基苯基)3H口占吨3酮和2(2,4二羟基苯甲酰基)苯甲酸等杂质。

厄他培南钠的合成研究

以(2S,4S)-2-[(3-羟基羰基)苯基]-氨基甲酰基吡咯烷-4-基巯醇(1)与(4R,5S,6S,8R)-3-[(二苯氧膦酰)氧]-6-(1-羟乙基)-4-甲基-7-氧-1-氮杂二环[3.2.0]庚-2-烯-2-羧酸-(4-硝基苯基)甲酯(2)为原料,经缩合、脱保护、树脂纯化制备了公斤级厄他培南钠(4)的。总收率61.5%,纯度99.4%。

色甘酸钠对大鼠胰腺纤维化血管紧张素Ⅱ受体表达的影响

目的探讨肥大细胞膜稳定剂色甘酸钠对大鼠慢性胰腺炎胰腺纤维化形成过程中血管紧张素Ⅱ(ANGⅡ)受体1(AT1)和2(AT2)表达的影响。方法 建立经逆行胰胆管注射2%三硝基苯磺酸(TNBS)诱导大鼠慢性胰腺炎模型,将大鼠分为3组,每组40只,分别用色甘酸钠(色甘酸钠组)、MC激动剂48/80复合物(48/80复合物组)及0.9%氯化钠溶液(对照组)进行干预,并于第3天、1周、2周、3周、4周处死动物。于5个不同时间点取胰腺组织标本,置液氮中冻存。采用免疫组织化学染色观察胰腺组织ANGⅡAT1和AT2的表达及分布,应用逆转录-聚合酶链反应(RT-PCR)研究胰腺组织ANGⅡAT1和AT2mRNA表达结果。结果 各组第3天时可见胰腺组织AT1及AT2蛋白表达阳性,并且随时间的延长,上述各项指标阳性表达逐渐增强,至第4周时最强。与对照组比较,色甘酸钠组大鼠胰腺组织AT1及AT2蛋白阳性表达均有不同程度地减少,而48/80复合物组有不同程度地增加。与对照组比较,色甘酸钠组各时间点AT1及AT2mRNA的表达显著减少(P值均<0.05),48/80复合物组则显著增加(P值均<0.05)。结论 色甘酸钠可能通过下调ANGⅡAT1和AT2的表达,减轻胰腺组织纤维化的形成。

Apoptotic effect and mechanisms of AHPN on human skin malignant melanoma cell A375

Objective： To study apoptotic effects of synthetic retinoic acid 6-[3-（1-adamantyl）-4-hydroxyphenyl]-2-naphthalene carboxylic acid（AHPN） on human skin malignant melanoma A375 cells in comparison with the natural ligand all-trans-retinoic acid（ATRA） in vitro and the mechanisms related to the actions of AHPN. Methods：MTT assay was used to determine the anti-proliferative effects of AHPN and ATRA on A375 cells. Flow cytometry was performed to investigate the influence of AHPN and ATRA on cell cycle and cell apoptosis. In addition, transfection and luciferase activity assays were employed to explore the mechanisms of how AHPN executes its proapoptotic function. Results：Firstly, AHPN promoted apoptosis and GI arrest in A375 cells compared with ATRA. Secondly, the activity of NF-K B in A375 cells treated with AHPN increased 2-3 times compared with solvent DMSO treatment. Conclusion：AHPN, in comparison with ATRA, is a more effective alternative for therapy of malignant melanoma. The potentially proapoptotic function of AHPN requires activation of NF-K B.

莱菔叶千里光化学成分的分离与鉴定

目的对莱菔叶千里光(Senecio raphanifolius Wall.ex DC)的化学成分进行研究。方法采用大孔吸附柱色谱、硅胶柱色谱、凝胶色谱、半制备高效液相色谱等技术对莱菔叶千里光乙醇提取物进行化学成分研究,根据波谱数据鉴定化合物结构。结果从莱菔叶千里光中分离得到18个化合物,分别为异鼠李素-3-O-β-D-半乳糖苷(1)、香草酸-4-O-β-D-吡喃葡萄糖苷(2)、原儿茶酸(3)、5-羟甲基糠酸(4)、绿原酸(5)、苯基-β-D-葡萄糖苷(6)、绿原酸甲酯(7)、蓝花楹酮(8)、对羟基苯乙酸(9)、原儿茶醛(10)、对羟基苯乙酸甲酯(11)、芦丁(12)、千里光内酯(13)、6-羟基香豆素-4-羧酸(14)、油酸酰胺(15)、异鼠李素-3-O-葡萄糖苷(16)、1-O-β-D-吡喃半乳糖基甘油(17)、(±)-seneciphyllic acid lactone(18)。结论化合物2、4、6、13~15、17、18是首次从千里光属植物中分离得到,化合物14和18是首次从天然产物中发现。