ACS Omega
·
2017
·
IF 0
Yijun Li,Xinyu Wen,Min Nie,Qi Wang
Dendritic β-nucleating agent (β-NA) can readily manipulate the formation of dendritic β-crystal with a unique toughening effect on polypropylene (PP) to drastically enhance the ductility. However, by the current method, the geometric size is too large to fully perform the nucleating efficiency. In this study, by comparatively investigating the effect of molecular weight of PP and diffusion of β-NAs in a PP melt, we proposed a novel carrier strategy that selective enrichment of β-NAs in a PP carrier was followed by directed migration into polymer matrix. Accordingly, the growth of NAs was controlled by the release from the PP carrier, which decreased the available amount of β-NAs during the growth stage. In this case, the viscosity difference between PP carrier and matrix determined the interfacial movement of β-NAs. When the PP carrier and matrix had same molecular weight, the diffusion and release became favorable to facilitate the formation of the dense and fine dendritic aggregates. As a result, the relative content of β-crystals reached 92%, with a drastic increase of ∼82% in the optimal condition compared to the directed compounded PP/β-NAs sample. This study can open a new avenue to tailor the topologies of β-NAs and the ensuing β-crystals for high-performance PP products.
✓ 已验证
产品关联
DOI
PubMed
BIOPOLYMERS
·
2012
·Vol. 97
·期 12
·988-997
·
IF 2.87
Qingye Liu,Xiaojuan Xu,Lina Zhang
We have firstly demonstrated the renaturation process of dissociated single chains of lentinan (s-LNT) and the variable conformations of the renatured LNT (r-LNT). The results from ultrasensitive differential scanning calorimetry and circular dichroism revealed that the variable structures including perfect triple helix, defective triple helix containing duplex segment, and single chains occurred in the renaturation of s-LNT, depending on the renaturation time, solvent composition, molecular weight, and the mode of renaturation. When water was added into s-LNT/dimethylsulfoxide (DMSO) to reach 95% (v/v), the classic low-temperature intra-triple-helical conformational transition at ∼10 ° C ( T 1 ) appeared within 4 h, indicative of a rapid reconstruction of triple helical structure. Besides, one newly endothermic peak at ∼43 ° C ( T 2 ) simultaneously occurred, which was first ascribed to the melting of duplex segment in the imperfect triplex. The duplex stretches disappeared when DMSO reached 50%, in which single chains coexisted with triplex. Moreover, the duplex segment disappeared by slowly dropping water into s-LNT/DMSO. This work suggested that the structure of r-LNT could be controllable, and provided important information for their successful development and application in polymer and life science. © 2012 Wiley Periodicals, Inc. Biopolymers 97:988–997, 2012.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2015
·Vol. 308
·期 1
·251-259
·
IF 1.034
Hu Chen,Liu Hui-jun,Peng Long,Sun Yun-kai,Long Wei
A specialized ethylamine-bridged β-cyclodextrins (EB β-CD) was synthetized. EB β-CD’s adsorption properties of thorium ions were performed. Experimental results show that the adsorption of thorium using the EB β-CD can achieve equilibrium within 60 min at room temperature under the condition of pH 4, the adsorbance is 10.49 mg g −1 . The results of SEM and BET nitrogen adsorption show that, EB β-CD is typical mesoporous material. According to pseudo-second-order kinetics, the adsorption of Th(IV) indicating the influence of textural properties of EB β-CD on the rate of adsorption. The thermodynamic parameters obtained showed that the adsorption process is exothermic, spontaneous process.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 15
·3757-3764
·
IF 5.256
Jiang-Shan Shen,Jia-Jia Wu,Xiang-Ying Sun,Zhen-Long Wu,Ping Gao,Bin Liu
We found that β-HgS nanocrystals could catalyze the reactions of oxidase substrates such as 3,3′,5,5′-tetramethylbenzidine (TMB) and O-phenylenediamine (OPD) to form coloured and fluorescent products, respectively, but α-HgS nanocrystals could not catalyze these reactions. Further investigation revealed that the predominantly exposed crystal planes may play an important role in determining the catalytic activity. On the basis of these findings, taken together with the reaction of forming a Schiff base between the –NH2 group of OPD and the –CHO group of formaldehyde, a novel, simple, and highly selective photoluminescence (PL) sensing platform for detecting formaldehyde could thereby be successfully developed.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 2
·
IF 1.866
Zhi Chen,Ting Wang,Xiufeng Yan
Current cyclodextrin (CD) hydrogels have disadvantages, including a limited CD content, long reaction time, and complicated chemical reactions. To overcome these, a one-pot reaction was adopted, and a concept of a β-CD hydrogel cage was proposed. Hydroxyethyl cellulose (HEC) was used as the raw material with the adjustment of the stoichiometric relationship among the crosslinking agent of epichlorohydrin, alkali environment, and β-CD amount, and an elastic β-CD hydrogel cage system was established. After the β-CD was caged, the contents of active β-CD in hydrogel products reached 74.45 and 69.14 wt % by weight measurement and photometric titration, respectively. Furthermore, compared to the pure HEC hydrogel, the hydrogel mechanical strength improved obviously after the β-CD was caged, and we obtained a faster water swelling rate at the same time. Finally, a hydrophobic molecule of phenolphthalein (PP) was used to evaluated the activity of caged β-CD in the hydrogel. In addition, the absorption and release of PP by an elastic β-CD hydrogel cage at certain time intervals were also studied. The results demonstrate that the β-CD hydrogel cage was used as a functional molecule carrier to quickly absorb and sustain the release of PP. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44388.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 60
·37508-37521
·
IF 3.108
Jianping Wei,Juan Yang,Zhihui Wen,Jun Dai,Yao Li,Banghao Yao
Efficient oxidation of methane over heterogeneous catalysts under ambient conditions is still a challengeable study toward C1 utilization and atmospheric cleansing. In this study, by using a hydrolysis method combined with an impregnation process, β-Ga2O3 nanoparticles supported uniformly on activated carbon (AC) can be obtained readily. The as-prepared Ga2O3/AC composites show efficient performance for photocatalytic oxidation of CH4 under ultraviolet irradiation. The experimental results indicate that photocatalytic activity toward CH4 oxidation is strongly dependent on the weight ratio of Ga2O3 to AC. 15%-Ga2O3/AC exhibits the highest catalytic activity, which is more than sixfold of P25, a benchmark photocatalyst. The photoluminescence spectra show the decreased recombination centers and the diminished recombination of photo-generated electrons (e−) and holes (h+) when Ga2O3 nanoparticles were deposited on AC. Further investigation reveals that the excellent photo-oxidation activity for CH4 over Ga2O3/AC can be ascribed to a synergistic effect involving strong adsorption capacity and improved separation of photo-generated e−/h+ pairs. Moreover, the photocatalytic oxidation of CH4 obeys pseudo-first-order kinetics and the cycling experiment indicates that Ga2O3/AC composites possess stable photocatalytic performance for CH4 oxidation. The underlying photo-oxidation mechanism is also investigated using electron paramagnetic resonance (ESR) and radical scavenging experiments. This study demonstrates that photocatalysis with Ga2O3/AC is a highly efficient method toward the oxidation of low concentrations of CH4, which provides valuable information for atmospheric environmental cleansing.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2017
·Vol. 64
·期 7
·795-803
·
IF 0.935
Junyu Lu,Lianqiang Wei,Dongmei Yao,Xiuju Yin,Hongfang Lai,Xiuxiang Huang
β-AgVO 3 nanorods have been demonstrated to exhibit intrinsic peroxidase-like activity. The oxidation of glucose can be catalyzed by glucose oxidase (GO x ) to generate H 2 O 2 in the presence of O 2 . The β-AgVO 3 nanorods can catalytically oxidize peroxidase substrates including o -phenylenediamine (OPD), 3,3′,5,5′-tetramethylbenzidine (TMB), and diammonium 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) by H 2 O 2 to produce typical color reactions: OPD from colorless to orange, TMB from colorless to blue, and ABTS from colorless to green. The catalyzed reaction by the β-AgVO 3 nanorods was found to follow the characteristic Michaelis–Menten kinetics. Compared with horseradish peroxidase and AgVO 3 nanobelts, β-AgVO 3 nanorods showed a higher affinity for TMB with a lower Michaelis–Menten constant ( K m ) value (0.04118 mM) at the optimal condition. Taking advantage of their high catalytic activity, the as-synthesized β-AgVO 3 nanorods were utilized to develop a colorimetric sensor for the determination of glucose. The linear range for glucose was 1.25–60 μM with the lower detection limit of 0.5 μM. The simple and sensitive GO x -β–AgVO 3 nanorods–TMB sensing system shows great promise for applications in the pharmaceutical, clinical, and biosensor detection of glucose.
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Jingting Tan,Na Meng,Yunting Fan,Yutian Su,Ming Zhang,Yinghong Xiao,Ninglin Zhou
A novel drug carrier based on hydroxypropyl-β-cyclodextrin (HP-β-CD) modified carboxylated graphene oxide (GO-COOH) was designed to incorporate anti-cancer drug paclitaxel (PTX). The formulated nanomedicines were characterized by Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). Results showed that PTX can be incorporated into GO-COO-HP-β-CD nanospheres successfully, with an average diameter of about 100 nm. The solubility and stability of PTX-loaded GO-COO-HP-β-CD nanospheres in aqueous media were greatly enhanced compared with the untreated PTX. The results of hemolysis test demonstrated that the drug-loaded nanospheres were qualified with good blood compatibility for intravenous use. In vitro anti-tumor activity was measured and results demonstrated that the incorporation of PTX into the newly developed GO-COO-HP-β-CD carrier could confer significantly improved cytotoxicity to the nanosystem against tumor cells than single application of PTX. GO-COO-HP-β-CD nanospheres may represent a promising formulation platform for a broad range of therapeutic agent, especially those with poor solubility.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2016
·
IF 3.652
Huidong Zheng,Jinliang Chen,Chao Li,Jingjing Chen,Yingshu Wang,Suying Zhao,Yanru Zeng
Myrcene, an important intermediate for the production of fine chemicals and pharmaceuticals, is mainly produced by the pyrolysis of β-pinene in the industry. The study of the direct pyrolysis of β-pinene was carried out without a catalyst and carrier gas at 573–873 K and under low pressure. In order to clarify the reaction mechanism, the primary intermediates of β-pinene pyrolysis including myrcene and limonene were also used as raw materials for further pyrolysis. The identification of some small molecules and C 10 H 16 isomers in the products proves that both decomposition reaction and ene reaction take place during the pyrolysis process. Based on the qualitative and quantitative analysis of reaction products, a reaction scheme for the pyrolysis of β-pinene was proposed. With appropriate simplification of the reaction scheme, a phenomenological kinetic model of the competitive parallel and consecutive first-order reaction was built, and exhibited good agreement with the experimental data. The activation energy ( E a ) and pre-exponential factor ( k 0 ) for each pathway were also determined.
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2014
·
IF 2.129
Na Li,Jiang-Kun Dai,Hong-Tao Du,Mao-Sen Yuan,Ji-Wen Zhang,Jun-Ru Wang
A novel sensing system based on the β -carboline core has been designed and synthesized for Hg 2+ detection in water. We have demonstrated that a straight forward methodology can provide rapid, sensitive and selective recognition (cross-contamination experiments) for Hg 2+ over a wide pH range. The vivid fluorescence change from blue to colorless can be clearly discriminated by the naked eye. Furthermore, there is a good negative correlation between the fluorescent intensity and the concentration of Hg 2+ in the range 1.0 × 10 −6 M–7.0 × 10 −6 M. β -Carboline as a fluorophore synthesized via this route also provides a new strategy for the design of novel fluorescence probes and fluorochromes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Pharmaceutical Analysis
·
2013
·
IF 0
Nan Zhou,Xia-Shi Zhu
Ionic liquids functionalized β-cyclodextrin polymer, a mono-6-deoxy-6-(1,2-dimethylimidazolium)-β-cyclodextrin iodide polymer (ILs-β-CDCP), was synthesized as a solid-phase adsorbent coupled with high-performance liquid chromatography for separating or analyzing magnolol in drug samples. The results showed that magnolol was adsorbed rapidly on ILs-β-CDCP and eluted with methanol. Under the optimum conditions, preconcentration factor of the proposed method was 12. The linear range, limit of detection (LOD), correlation coefficient ( R ) and relative standard deviation (RSD) were found to be 0.02–8.00 μg/mL, 1.9 ng/mL, 0.9992 and 2.76% ( n =3, c =2.00 μg/mL), respectively. The interaction between ILs-β-CDCP and magnolol was studied through the inclusion constant, FTIR and TGA analysis. This proposed method has been successfully applied to the determination of magnolol in real samples.
✓ 已验证
产品关联
DOI
PubMed
SUPRAMOLECULAR CHEMISTRY
·
2017
·
IF 1.264
Xingxiu Qin,Xiashi Zhu
Ionic liquid-β-cyclodextrin polymer (ILs-β-CDCP) was firstly synthesised and characterised with FTIR, 13C CP/MAS NMR, X-ray powder diffraction, TGA and scanning electron microscope. A novel method of solid phase extraction (SPE) coupled with Ultraviolet–vis spectrophotometry for separation/analysis of lornoxicam was established. ILs-β-CDCP showed a higher adsorption capacity towards lornoxicam than β-CDCP. Adsorption mechanism of ILs-β-CDCP was elucidated by adsorption thermodynamics model, adsorption kinetic model, inclusion constants and FTIR analysis. ILs-β-CDCP exhibited favourable adsorption performance towards lornoxicam from serum and tablet samples. The experimental results herein suggested that ILs-β-CDCP could be successfully applied in the field of pharmic content especially in the treatment of serum.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）