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Abstract

Mesoporous silica KIT-1 supported with active polytungstophosphate anion of PW x O y species was synthesized and successfully used to catalyze the alkene epoxidation in the environmentally benign solvent of ethyl acetate. The immobilized catalyst of KIT-N+-PW x O y was stable and robust for the epoxidation. In addition, the active species of PW x O y , the molecular sieve support of KIT-1 and the immobilized catalyst of KIT-N+-PW x O y were characterized by FT-IR, UV–vis, XRD, 31P MAS NMR, SEM, N2 adsorption/desorption, ICP and XPS in detail.

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Abstract

A facile and reusable catalytic system for alcohol oxidation with hydrogen peroxide was designed based on a temperature-responsive catalyst. Several kinds of alcohols were efficiently oxidized in high yields under relatively mild conditions. The catalyst could be easily recovered and reused.

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Abstract

A novel temperature-controlled phase transfer catalytic system based on [(C18H37)2(CH3)2N]7[PW11O39] for olefin epoxidation was demonstrated. The reaction was conducted in a non-chlorinated solvent of ethyl acetate with hydrogen peroxide. The catalyst was easily recovered and reused even ten cycles without loss in activity and selectivity.

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Abstract  

Experiments on the removal and recovery of U(VI) from aqueous solution by tea waste were conducted. The adsorbent was characterized by scanning electron microscope and energy dispersive spectrometer before and after the adsorption treatment. The removal of U(VI) amounts to 86.80 % at optimum pH 6. The adsorption process reaches its equilibrium in 12 h at 308 K, and the kinetic characteristic can be described by the pseudo-second-order kinetic equation. The amount of adsorption increases from 22.92 to 142.21 mg g−1 with the decrease of tea waste dosage from 100 to 10 mg for solution with an initial uranium concentration of 50 mg L−1. Desorption for the four strippants is higher than 80 %. The equilibrium data are more agreeable with Freundlich isotherm than Langmuir isotherm.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
Yong He
,
Rui Ding
,
Hang Liu
,
Xiao Wang
,
Jing-Li Xu
,
Man Feng
,
Yu-Rong Chen
,
Chuan-Min Qi
,
Cheng Peng
,
Zhao-Hui Zhu
,
Yong-Hong Dang
,
Ming Wang
, and
Yun-Chuan Ma

Abstract  

As degradation product of Antineoplaston A10 in vivo, phenylacetyl glutamine showed antitumor activities. According to literatures, we designed and radiosynthesized a phenylacetyl glutamine derivative, which was achieved under a mild reaction condition. Evaluations in vitro and in vivo were performed on tumor bearing mice. Excitingly, the radiochemical purity of (S)-2-((S)-2-(4-(3-fluoropropyl)benzamido)-3-phenylpropanamido)pentanedioic acid ([18F]FBPPA) was 98%, and besides the best radiochemical yield was up to 46%. T/Bl (Tumor/Blood) and T/M (Tumor/Muscle) ratios of [18F]FBPPA at 60 min post injection were 2.33 and 3.51. Meanwhile, it showed satisfied stability in vitro and in vivo, compared with 2-[18F]fluorodeoxyglucose ([18F]FDG). Although [18F]FBPPA deserved further studies to make optimizations on its structure, the results revealed it might become a potential PET imaging agent for detecting tumors.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
Chuan-Min Qi
,
Yong He
,
Xiao Wang
,
Man Feng
,
Jing-Li Xu
,
Rui Ding
,
Hang Liu
,
Yu-Rong Chen
,
Fang Li
,
Zhao-Hui Zhu
,
Yong-Hong Dang
,
Shu-Ting Zhang
, and
Ying Xie

Abstract  

d-glucosamine at concentration of certain range could kill tumor cells without influencing normal cells. There are also some reports on the antitumor activity of d-glucosamine and its derivatives in murine models. It was therefore postulated that d-glucosamine might have the potential to invade tumor cells. We designed and radiosynthesized a glucosamine derivative, N-(2-[18F]fluoro-4-nitrobenzoyl)glucosamine ([18F]FNBG([18F]7)). Evaluations in vitro and in vivo were performed on tumor bearing mice. Excitingly, the radiochemical purity of [18F]FNBG([18F]7) was 99%, and besides the best radiochemical yield was up to 35%. The best T/Bl (Tumor/Blood) and T/M (Tumor/Muscle) ratios of [18F]FNBG([18F]7) were 4.40 and 4.84. Although [18F]FNBG([18F]7) deserved further studies, the results revealed it might become a potential PET imaging agent for detecting tumors.

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Acta Chromatographica
Authors:
Long Wang
,
Yuan-Yuan Jiang
,
Li Zhang
,
Tao Wang
,
Rui-Wu Yang
,
Chun-Bang Ding
,
Xiao-Li Wang
, and
Yong-Hong Zhou

A high-performance liquid chromatography (HPLC) method has been developed for the simultaneous identification and quantification of active compounds (cryptotanshinone, dihydrotanshinone I, tanshinone IIA, tanshinone I, salvianolic acid A, salvianolic acid B, protocatechuic aldehyde, and rosmarinic acid) contained in traditional Chinese folk medicine Salvia przewalskii Maxim. The herb samples (including wild, cultivated, and yin pian) from fourteen main regions were investigated. Chromatographic separation was performed on an Agilent Eclipse XDB-C18 reserved-phase column (250 mm × 4.6 mm i.d., 5 μm) using gradient elution with water-formic acid (99.9: 0.1, v/v) and acetonitrile at a flow rate of 0.8 mL min−1, an operating temperature of 30 °C, and a wavelength of 275 nm. Similarity analysis (SA), principal component analysis (PCA), and hierarchical cluster analysis (HCA) were used to analyze the data based on fingerprints. For fingerprint analysis, 27 peaks were selected as the common peaks to evaluate the similarities among different samples. The results of SA showed that the method permits to obtain desired linearity, precision, accuracy, and recovery. All samples were divided into three categories by PCA and HCA, and the concentration of the eight bioactive compounds varied significantly from different regions. It was demonstrated that chromatographic fingerprinting by HPLC combined with the simultaneous determination of eight bioactive compounds was a helpful method for the quality control of S. przewalskii.

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