bluuebunny/crossref_metadata_2025_split huggingface dataset:
A high‐efficiency preparation, properties and structure of (R, S)‐and (S, S)‐pyrrolidine‐2‐carboxylic acid 3,5‐dioxa‐4‐boracyclohepta [2,1‐a; 3,4‐ a′] dinaphthalen‐4‐yl esters
Authors: Shan Zi‐Xing , Liu Si‐Min , Liu De‐Jun 
Published: September 2010

AbstractA highly‐efficient preparative procedure for (R, S) and (S, S)‐pyrrolidine‐2‐carboxylic acid 3,5‐dioxa‐4‐boracyclohepta[2, 1‐a; 3, 4‐a] dinaphthalen‐4‐yl esters [namely (R, S)‐BNBAP and (S, S)‐BNBAP] is described and the crystal structure of (R, S)‐BNBAP was obtained. The data indicate that (R, S)‐ BNBAP is a spirocyclic inner borate salt with almost normal tetrahedral configuration. This structural form may be the basic reason for their high chemical, optical and thermodynamic stability.
Purification, characterization and 1H NMR resonance assignment of an α‐like neurotoxin BmK 16 from the venom of chinese scorpion Buthus martensii karsch
Authors: Zhang Nai‐Xia , Wu Gong , Wang Zhong‐Hua , Wu Hou‐Ming 
Published: September 2010

AbstractA natural scorpion toxin BmK 16 was purified for the first time from the venom of the Chinese scorpion Buthus martensii Karsch (BmK) by using combined gel‐filtration, ion exchange and reversed phase chromatography. The sequence of the N‐terminal 8 amino acid residues was determined by Edman degradation. Using the TV‐terminal sequence as a tag, the database searching revealed a hit in the scorpion cDNA Bank. The sequence for N‐terminal 8 amino acid residues, molecular weight and amino acid compositions of BmK 16 were identical with the calculated values according to the first 64 residues′ sequence of the precursor peptide alpha‐neurotoxin TX16 derived from the sequence of the cDNA AF156597 (EMBL). The sequence‐specific resonance assignment of BmK 16 was achieved and the ′intact sequence of BmK 16 was determined as followings: VRDAY IAKPH NCVYE CARNE YCNDL CTKNG AKSGY CQWVG KYGNG CWCKE LPDNV PIRVP GKCH. Furthermore, the results from the sequence homology analysis and the toxicity assays indicated that BmK 16 was an α‐like scorpion neurotoxin.
A new synthetic strategy to prepare a polyphosphazene with charge‐transporting agents and nonlinear optical chromophores as side chains
Authors: Li Zhen , Qin Jin‐Gui , Li Shao‐Jun , Ye Cheng 
Published: September 2010

AbstractA new strategy, a post coupling method to develop the polyphosphazene (P2) functionalized with carbazolyl groups and nonlinear optical (NLO) chromophores, has been explored. P2 exhibits good solubility in common organic solvents. The poled film of P2 exhibits a resonant d33 value of 42 pm/V by second harmonic generation (SHG) measurements.
Thermochemistry on Coordination Behavior of Praseodymium Chloride Hydrate with Diethylammonium Diethyldithiocarbamate
Authors: Chen San‐Ping , Ren Yi‐Xla , Jiao Bao‐Juan , Gao Sheng‐Li , Zhao Feng‐Qi , Hu Rong‐Zu , Shi Qi‐Zhen 
Published: September 2010

AbstractThe complex of praseodymium chloride lower hydrate with diethylammonium diethyldithiocarbamate (D‐DDC) has been synthesized conveniently in absolute alcohol and dry N2 atmosphere. The title complex was identified as Et2NH2 [Pr‐(S2CNEt2)4] by chemical and elemental analyses, the bonding characteristics of which were characterized by IR spectrum. The enthalpy of solution for praseodymium chloride hydrate and D‐DDC in absolute alcohol at 298.15 K, and the enthalpy changes of liquid‐phase reaction of formation for Et2NH2 [Pr‐(S2CNEt2)4] at different temperatures were determined by microcalorimetry. On the basis of experimental and calculated results, three thermodynamic parameters (the activation enthalpy, the activation entropy and the activation free energy), the rate constant and three kinetic parameters (the apparent activation energy, the pre‐exponential constant and the reaction order) of liquid phase reaction of formation were obtained. The enthalpy change of the solid‐phase title reaction at 298.15 K was calculated by a thermochemical cycle.
Kinetics of the Exothermic Decomposition Reaction of N‐Methyl‐N‐nitro‐2,2,2‐trinitroethanamine
Authors: Chen San‐Ping , Hu Rong‐Zu , Song Ji‐Rong , Yang De‐Suo , Gao Sheng‐Li , Zhao Hong‐An , Shi Qi‐Zhen 
Published: September 2010

AbstractThe thermal behavior and kinetic parameters of the exothermic decomposition reaction of N‐methyl‐N‐nitro‐2,2,2‐trinitroethanamine in a temperature‐programmed mode have been investigated by means of differential scanning calorimetry (DSC). The kinetic equation of the exothermic decomposition process of the compound is proposed. The values of the apparent activation energy (Ea), pre‐exponential factor (A), entropy of activation (ΔS≠), enthalpy of activation (ΔH≠), and free energy of activation (ΔG≠) of this reaction and the critical temperature of thermal explosion of the compound are reported. Information is obtained on the mechanism of the initial stage of the thermal decomposition of the compound.
Synthesis, Characterization and Weak Intramolecular Interactions of Porphyrins Bearing Nucleobases
Authors: Ruan Wen‐Juan , Li Ying , Zhao Xiao‐Jing , Wang Chuan‐Zhong , Zhu Zhi‐Ang , Miao Fang‐Ming 
Published: September 2010

Abstract5, 10, 15‐Triphenyl‐20‐|2‐[α‐(adenine‐9) acetylamino]| phenyl porphyrin (1), 5,10,15‐triphenyl‐20‐|2‐[α‐(cytosine‐l)acetylamino]| phenyl porphyrin (2), 5, 10, 15‐triphenyl‐20‐|4‐[α‐(cytosine‐1)ethoxy]| phenyl porphyrin (3) and their zinc complexes Zn‐1, Zn‐2 and Zn‐3 have been prepared and characterized by 1H NMR spectra, elemental analyses, electronic absorption spectra and mass spectra (FAB). Intramolecular π‐π interactions and intramolecular metal‐π interaction for 1, 2, Zn‐1, and Zn‐2 have been investigated by several methods. 1H NMR studies demonstrate that the porphyrin π‐system in 1 and 2 is parallel to the adenine and the cytosine aromatic ring, respectively. The electronic absorption spectral properties of free porphyrin derivatives and their zinc complexes have been compared with those of H2TPP and ZnTPP. The results show that the UV‐vis spectra of 1 and 2 are the same as that of H2TPP, whereas the spectra of their zinc complexes show 7 nm red shifts of the Soret bands compared to that of ZnTPP. The emission spectra of Zn‐1 and Zn‐2 are independent of excitation wavelength. From combination of the evidence of absorption and emission spectra it is suggested the existence of intramolecular metal‐π interaction in Zn‐1 and Zn‐2. The results of conformational analysis agreed quite nicely with that of experiments, thus it was further to validate the experimental conclusions.
Synthesis and Structure of Tetraploid (Imidazole) Copper (II) Terephthalate, [Cu(Im)4] (teph)
Authors: Wan Jun , Ye Su‐Juan , Wen Yong‐Hong , Zhang Shu‐Sheng 
Published: September 2010

AbstractThe crystal structure of [Cu (Im)4] (teph) (Im = imidazole, teph = terephthalate) has been determined by X‐ray crystallography. It crystallizes in the triclinic system, space group Pī with cell dimensions of a = 0.80356 (16) nm, b = 0.84269 (17) run, c = 0.88967 (18) nm, α = 76.90 (3)°, β = 68.95 (3)°, γ = 75.94 (3)°, and Z = 1. Its structure of the title compound is composed of discrete monomelic molecule of [Cu (Im)4]‐(teph). The copper (II) ions have a square plane geometry with the CuN4 chromophore.
Kinetics and Mechanism of Oxidation of Ethylene Glycol Monoethylether by Diperiodatonickelate(IV) in Alkaline Medium
Authors: Shan Jin‐Huan , Wei Hai‐Ying , Shen Shi‐Gang , Sun Han‐Wen 
Published: September 2010

AbstractThe kinetics of oxidation of ethylene glycol monoethylether (EGE) by diperiodatonickelate(IV) ion (DPN) was studied by spectrophotometry in alkaline medium. The reaction rate showed first order dependence on Ni(IV) and positive fractional order with respect to EGE. The pseudo‐first order rate constants, kobs increased with the increase of [OH−] and decreased with the increase of [IO4−]. Added salts had little effect on the rate and no free radical was detected. Based on these, the mechanism including the equilibrium between DPN and EGE was proposed. Furthermore, the activation parameters of the reaction were calculated.
Synthesis, Crystal Structure, UV‐vis and EPR Studies of (NH3CH2CH2NH2)2.5[Mo(V)0.5W(VI)0.5O2(OC6H4O)2]
Authors: Lu Xiao‐Ming , Song Fu‐Gen , Lou Fu‐Yan , Mao Xi‐An , Ye Zhao‐Hui , Lu Jing‐Fen 
Published: September 2010

AbstractCis‐dioxo‐metal complex (NH3CH2CH2NH2)2.5[Mo(V)0.5W(VI)0.5O2‐(OC6H4O)2] 1 was obtained by the reaction of tetra‐butyl ammonium hexamolybdotungstate with 1, 2‐dihydroxybenzene in the mixed solvent of CH3OH, CH3CN and ethylenediamine, and characterized by X‐ray diffraction, UV‐vis and EPR analysis. Compared with its analogous complexes (NH3CH2CH2‐NH2)3[Mo(V)O2(OC6H4O)2] 2 and (NH3CH2CH2NH2)2[W(VI)‐O2(OC6H4O)2] 3, the results show that tungsten(VI) is less active in redox than molybdenum (VI) and that the change of the valence induced by substitution of W(VI) for Mo(V) in [MO2‐(OC6H4O2]n‐does not influence the coordination geometry of the complex anion in which the metal center exhibits distorted octahedral coordination withcis‐dioxo catechol. The responses to EPR of complexes 1 and 2 are active but complex 3 is silent, and the UV‐vis spectra exhibited by the three complexes are obvious different because of the different electronic configuration between the central Mo(V) and W(VI) ions in the complexes. It is noteworthy that complexes 1 and 2 have the similar EPR signal to flavoenzyme, suggesting that the three complexes have the same coordination geometry feature with the co‐factor of flavoenzyme.
Investigation of Mixed Chiral Selectors of Different Metal Ion‐L‐Alanine Complex and β‐Cyclodextrin on the Chiral Separation of Dansyl Amino Acids with Capillary Electrophoresis
Authors: Zheng Zhi‐Xia , Qu Feng , Lin Jin‐Ming 
Published: September 2010

AbstractChiral separation of dansyl amino acids by capillary electrophoresis using mixed selectors of Mn (II)‐L‐alanine complex and β‐cyclodextrin (β‐CD) was studied. Resolution was considerably superior to that obtained by using either Mn(II)‐L‐alanine complex or β‐CD alone. The effects of separation parameters, such as pH value of buffer solution, capillary temperature, the concentration of Mn (II)‐L‐alanine complex, the types of CD and ligand on the migration times and resolutions were investigated. Six different transition metal complexes, Cu(II), Zn(II), Co(II), Ni(II), Hg(n) and Cd(n)‐L‐alanine complexes have been employed and compared with Mn(II) complex. Differences in retention and selectivity were found. The substitution of Cu(II), Zn(H), Co(II) and Ni(II) for Mn (II) resulted in a better chiral resolution while Hg(II) and Cd (II) showed poorer resolution abilities. The chiral separation mechanism was also discussed briefly.
Fluorescence Quenching and Binding Interaction of 10‐Methylacridinium Iodide to Nucleic Acids
Authors: Sun Xian‐Feng , Jiang Zhi‐Qin , Ding Bing‐Lin 
Published: September 2010

AbstractInteraction of 10‐methylacridinium iodide (MAI) as fluorescence probe with nucleobases, nucleosides and nucleic acids has been studied by UV‐visible absorption and fluorescence spectroscopy. It was found that fluorescence of MAI is strongly quenched by the nucleobases, nucleosides and nucleic acids, respectively. The quenching follows the Stern‐Volmer linear equation. The fluorescence quenching rate constant (kq) was measured to be 109‐1010 (L/mol)/s within the range of diffusion‐controlled rate limit, indicating that the interaction between MAI and nucleic acid and their precursors is characteristic of electron transfer mechanism. In addition, the binding interaction model of MAI to calf thymus DNA (ct‐DNA) was further investigated. Apparent hypochromism in the absorption spectra of MAI was observed when MAI binds to ct‐DNA. Three spectroscopic methods, which include (1) UV spectroscopy, (2) fluorescence quenching of MAI, (3) competitive dual‐probe method of MAI and ethidium bromide (EB), were utilized to determine the affinity binding constants (K) of MAI and ct‐DNA. The binding constants K obtained from the above methods gave consistent data in the same range (1.0–5.5) × 104L/mol, which lend credibility to these measurements. The binding site number was determined to be 1.9. The influence of thermal denaturation and phosphate concentration on the binding was examined. The binding model of MAI to ct‐DNA including intercalation and outside binding was investigated.
(E)‐α‐Bromovinylselenides as Convenient Precursors for Stereoselective Synthesis of Trisubstituted Alkenes
Authors: Cai Ming‐Zhong , Huang Jia‐Di , Hao Wen‐Yan 
Published: September 2010

AbstractBased on the different reactivity of selanyl and bromo groups, (E)‐α‐bromovinylselenides can undergo sequential cross coupling reactions with nucleophiles in the presence of transition metal complexes to form two carbon‐carbon bonds in the same olefinic carbon leading to trisubstituted alkenes stereoselectively in good yields.
Novel Synthesis of N‐Substituted p‐Hydroxybenzoic Amides on Soluble Polymer‐Support
Authors: Hu Chun‐Ling , Chen Zu‐Xing , Yang Gui‐Chun 
Published: September 2010

AbstractThe synthesis of N‐substituted p‐hydroxybenzoic amides using a liquid phase approach is described. Poly (ethylene glycol) (PEG) and p‐hydroxybenzoic acid were linked by oxalyl chloride to give compound 1, which was chlorinated by thionyl chloride, followed by amidation with NHR1R2 to yield compound 3. Hydrolysis of compound 3 gave the title amide 4. These crude library members were obtained in good yields with high purities.
Solid Phase Synthesis of Ethyl β‐Substituted Indolepropionates
Authors: Liu Zhan‐Xiang , Ruan Xiu‐Xiu , Huang Xian 
Published: September 2010

AbstractA facile solid phase synthesis of ethyl β‐substituted indolepropionates is reported. Condensation between indole, polymer‐supported cyclic malonic acid ester and aldehyde yielded the trimolecular adducts, which was cleaved by pyridine/EtOH to release the final products in good yield with high purity.
Triterpenoid Saponins from Luculia pincia Hook
Authors: Kang Wen‐Yi , Wang Jun‐Song , Yang Xiao‐Sheng , Hao Xiao‐Jiang 
Published: September 2010

AbstractTwo new triterpenoid saponins, cincholic acid‐3‐O‐β‐D‐xylopyranoside, 28‐O‐β‐D‐glucopyranosyl ester (1), quinovic acid‐28‐O‐β‐D‐glucopyranosyl ester (4), and a new phenolic glucoside, 4‐[4'‐O‐(2', 3', 5', 6'‐tetrahydroxy phenyl)‐β‐D‐glucoside]‐1‐butene (2), along with five known triterpenoid saponins and one phenolic glucoside were isolated from the n‐butanol fraction of the stems of Luculia pinciana Hook. Their structures were established by means of spectroscopic methods.
Asymmetric Arrangement of Monolayer in the Multilayer Films of 2‐Hydroxy‐4,4'‐dihexyloxy‐azobenzene
Authors: Jin Jian , Wang Gang , Yang Wen‐Sheng , Liu Guo‐Zong , Li Tie‐Jin 
Published: September 2010

AbstractMultilayer films of 2‐hydroxy‐4,4'‐dihexyloxy‐azobenzene (HAB) on silicon substrates have been studied with atomic force microscopy, temperature‐dependent FTIR, and X‐Ray diffraction technique. The results show that the multilayer films are formed by stacking of HAB monolayers via π‐π interactions and the adjacent two monolayers in the film are arranged in an asymmetric way in the multilayer films.
o‐ZrW1.6Mo0.4O8: A Novel Orthorhombic Intermediate Phase Formed During the Synthesis of the Negative Thermal Expansion Cubic ZrW1.6Mo0.4O8 Material by the Precursor Dehydration Route
Authors: Zhao Xin‐Hua , Huang Ling , Liu Peng‐Hui , Ma Hui 
Published: September 2010

AbstractThe mechanism of the precursor dehydration route was revealed for the synthesis of NTE c‐ZrW1.6Mo0.4O8. The hydrate precursor was dehydrated at 473 K and transformed to a NTE cubic compound above 800 K. A novel intermediate phase o‐ZrW1.6Mo0.4O8 occurs between the temperature range of 573–800 K. The XRD pattern of novel intermediate was refined with the structural model of LT‐ZrMo2O8 by using Rietveld method. The residuals are Rwp = 7.80% and Rp = 5.79%. The space group is Pmn21 and the lattice parameters are a = 0.5917(4) nm, b =0.7273(4) nm, c =0.9148(6) nm, and Z = 2.
Studies on Tripolycyanamide Formaldehyde Resin‐Pd Complex and Its Use in the Synthesis of the Branch of Paclitaxel
Authors: Qi Chuan‐Min , Yang Ling‐Chun , Wang Li‐Yuan 
Published: September 2010

AbstractA novel method was developed to prepare the branch of paclitaxel using 2, 4‐dichlorophenylaldehyde as the starting material. The branch was synthesized through condensation, cycloaddition and catalyzing hydrogenation of dichlorophenyl intermediate. Tripolycyanamide formaldehyde resin‐Pd complex as hydrogenation catalyst has been studied. The influence of temperature and N/Pd atomic ratio of the catalyst on the effect of catalytic hydrogenation was investigated and the optimum conditions were found. Because of the mild cyclization reaction condition, convenient asymmetric resolution operation and high yield, the synthetic route was practical.
Non‐isothermal Kinetics of the Thermal Decomposition of 3‐Nitro‐1, 2, 4‐triazol‐5‐one Magnesium Complex
Authors: Ma Hai‐Xia , Song Ji‐Rong , Hu Rong‐Zu , Li Jun 
Published: September 2010

AbstractThe thermal decomposition of 3‐nitro‐1, 2, 4‐triazol‐5‐one magnesium complex and its kinetics were studied under the non‐isothermal condition by DSC and TG/DTG methods. The kinetic parameters were obtained from analysis of the DSC and TG/DTG curves by the Kissinger method, the Ozawa method, the differential method and the integral method. The most probable mechanism functions for the thermal decomposition of the first stage, the second stage and the third stage were suggested by comparing the kinetic parameters. The entropy of activation (ΔS−), enthalpy of activation (ΔH−) and free energy of activation (AC) at Tpdo are‐66.74 J‐mol−1K−1, 119.2 kJ‐moI−1 and 152.44 kJ · mol−1, respectively.
Synthesis, Characterization and Thermochemistry of 2MgO · B2O3 · 1.5H2O
Authors: Liu Zhi‐Hong , Zhao U , Hu Man‐Cheng 
Published: September 2010

AbstractA new magnesium borate 2MgO‐B2O3‐1.5H2O has been synthesized by the method of phase transformation of double salt under hydrothermal condition and characterized by XRD, IR, Raman spectra and TG. The enthalpy of solution of 2MgO · B2O3 · 1.5H2O in 2.9842 mol‐L−1 HCl was determined. From a combination of this result with measured enthalpies of solution of H3BO3 in 2.9842 mol · L−1 HCl(aq.) and of MgO in (HCl + H3BO3) solution, together with the standard molar enthalpies of formation of MgO(s), H3BO3(s), and H2O(1), the standard molar enthalpy of formation of‐(3019.76 ± 1.79) kJ · mol−1 of 2MgO · B2O3 · 1. 5H2O was obtained. 2MgO · B2O3 · 1.5H2O, synthesis, characterization, standard molar enthalpy of formation
Standard Molar Enthalpies of Formation of Ce(TCA)3 · 3H2O(s) and Ce(TCA)(C9H6NO)2(s)
Authors: Li Qiang‐Guo , Ye Li‐Juan , Shou Meng‐Juan 
Published: September 2010

AbstractThe standard molar reaction enthalpies of two reactions, CeCl3 · 7H2O(s) + 3CCl3COOH(s) = Ce(TCA)3· 3H2O(s) +3HCl(g) + 4H2O(1) (1) and Ce(TCA)3· 3H2O (s) + 2C9H7NO (S) = Ce(TCA) (C9H6NO)2 (s) + 2CCl3COOH(s) + 3H2O(1) (2), were investigated by classical solution calorimetry and an isoperibol calorimeter at 298.15 K. The standard molar enthalpies ΔsH·m of solution of CeCl3 · 7H2O(s), 3CCl3COOH(s), Ce(TCA)3 · 3H2O(s), Ce(TCA)3 · 3H2O(s), 2C9H7NO(s), Ce‐(TCA) (C9H6NO)2(s) and 2CCl3COOH(s) were determined to be (50.615 ± 0.028), (23.431 ± 0.027), (94.206 ± 0.010), (54.151 ± 0.020), (27.485 ± 0.045), (106.392 ± 0.060) and‐(14.893 ± 0.026) kJ/mol, respectively. The reaction enthalpies ΔrH⊖m of reactions (1) and (2) were obtained to be (204.279 ± 0.023) and‐(9.863 ± 0.041) kJ/mol, respectively. According to the above results and the data given in literature, through Hess' law, the standard molar enthalpies ΔtH⊖m of formation of Ce(TCA)3 ± 3H2O(s) and Ce(TCA)(C9H6NO)2 (s) were estimated to be‐(3060.0 ± 0.087) and‐(1369.0 ± 0.292) kJ/mol, respectively.
Synthesis, Structure and Adsorption of AIPO‐21 Prepared by Cotemplate Method
Authors: Zhang Lei , Cheng Xiao‐Wei , Long Ying‐Cai 
Published: September 2010

AbstractThe phase of AIPO‐21 was hydrothermally synthesized in the reactant system of diethylamine‐RB‐Al2O3‐O5‐H2O‐C2H5OH. The crystals of AIPO‐21 growing in this system crystallizes in monoclinic system, space group P21/n with a = 0.8542(4) nm, b = 1.7635(8) nm, c = 0.9082(4) nm, β = 108.234(5)°, V = 1.2993(10) nm3, Z = 4, and the formula is [C4H10 NH2]+ = [Al3P3O12 (OH)]−. The structure is resolved by the direct method and refined to R1 = 0.0767 and wR2 = 0.1627 based on 1719 observed reflections with I > 2.0σ (I). An asymmetric unit consists of three PO4 tetrahedra, one AIO4 tetrahedron and two AIO5 trigonal bipyramids. The framework is composed of 3‐D uniform channels along [100], [001] and [101] with eight‐membered oxygen ring windows. The powder sample of the MS was investigated with powder XRD, TG/DTG/DTA and the adsorption of water, methanol, n‐hexane, ethylene, and ethane. The specific property for sieving molecules was observed on the adsorption isotherms, and proves the result of the single crystal structural analysis.
High Selective Determination of Anionic Surfactant Using Its Parallel Catalytic Hydrogen Wave
Authors: Guo We , He Ying‐Ying , Song Jun‐Feng 
Published: September 2010

AbstractA faradaic response of anionic surfactants (AS), such as linear alkylbenzene sulfonate (LAS), dodecyl benzene sulfonate and dodecyl sulfate, was observed in weak acidic medium. The faradaic response of AS includes (1) a catalytic hydrogen wave of AS in HAc/NaAc buffer that was attributed to the reduction of proton associated with the sulfo‐group of AS, and (2) a parallel catalytic hydrogen wave of AS in the presence of hydrogen peroxide, which was due to the catalysis of the catalytic hydrogen wave of AS by hydroxyl radical OH electrogenerated in the reduction of hydrogen peroxide. The parallel catalytic hydrogen wave is about 50 times as sensitive as the catalytic hydrogen wave. Based on the parallel catalytic hydrogen wave, a high selective method for the determination of AS was developed. In 0.1 mol/L HAc/NaAc (pH = 6.2 ± 0.1)/1.0 ± 10−3 mol/L H2O2 supporting electrolyte, the second‐order derivative peak current of the parallel catalytic hydrogen wave located at‐1. 33 V (vs. SCE) was rectilinear to AS concentration in the range or 3.0 × 10–6‐2.5 × 10–4 mol/L, without the interference of other surfactants. The proposed method was evaluated by quantitative analysis of AS in environmental waste water.
Synthesis of Unsymmetrical Branched Polyether Dendrons from 3, 4‐Methylene‐dioxybenzaldehyde
Authors: Zhou Zhao‐Li , Wang Feng , Cao Xiao‐Ping 
Published: September 2010

AbstractUnsymmetrical dendrons 1, 2 and 3 were easily prepared according to a novel convergent strategy from 3, 4‐methylene‐dioxybenzaldebyde as starting material.
Ligand Exchange Between Penta‐Coordinated Phosphoryl Serine and Histidine Compounds
Authors: Cao Shu‐Xia , Niu Ming‐Yu , Su Yu‐Qian , Liao Xin‐Cheng , Lu Kui , Zhao Yu‐Fen 
Published: September 2010

AbstractWith the assistance of HPLC‐ESI‐MS/MS, the self‐assembly products of serine and histidine penta‐coordinated phosphorus compound were separated and identified. The expectative product was seryl‐histidine dipeptide, but it was found that there was almost equimolar amount of histidyl‐histidine dipeptide as well as seryl‐histidine dipeptide. The mechanism was speculated that there was ligand exchange between penta‐coordinated phosphoryl serine and histidine in the reaction process. As a result, two types of dipeptide were produced.
Structure of an Extracellular Polysaccharide from a Strain of Lactic Acid Bacteria
Authors: Gu Xiao‐Mei , Ma Gui‐Rong , Wu Hou‐Min 
Published: September 2010

AbstractA new extracellular polysaccharide (EPS‐I) isolated and purified from Z222, a strain of Lactic acid bacteria has been investigated. Sugar composition analysis, methylation analysis and 1H NMR and 13C NMR spectroscopy reveal that the EPS‐I is composed of a pentasaccharide repeating unit. The sequence of sugar residue was determined by using two‐dimensional NMR spectroscopy, including heteronuclear multiple‐bond correlation (HMBC) and nuclear overhauser effect spectroscopy (NOESY).