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In order to determine the effect of the amido and hydroxyl of chitosan on antioxidant activity, a series of N-deacetylated chitosan with a degree of deacetylation (D.D.) ranging from 45% to 95% were prepared using region selective N-acetylation of chitosan. Their carboxymethyl derivatives (CMC) were also synthesized according to previous method. The antioxidant activity was evaluated on the basis...
Objective Xanthine oxidase inhibitory activities of the total biflavonoids and eight biflavonoid compounds isolated from the medicinal plants of Selaginella labordei have been investigated. Method The active compounds were screened out by measuring the inhibition rate and the 50% inhibitory concentration (IC50) of each sample against xanthine oxidase (XOD) in vitro. Result Three kinds of biflavonoids...
Calcined layered double hydroxides particles were used as adsorbent to remove fluoride ions. Batch adsorption studies were conducted under various equilibrating conditions. The results show that the HTlc calcined at 500??C had the highest capacity of removal of fluoride ions, after adsorption it regenerated to its original layered structure, it is called "memory effect". In field water studies,...
In this paper, we took Elaeagnus angustifolia as material. The paper studied characteristics of seasonal and spatial variations of proanthocyanidins content. There was an apparent difference in proanthocyanidins content of the leave from May to October, the maximim content of proanthocyanidins in October was 34.36 mgldrg-1 DW, while proanthocyanidins content in July was only 17.16 mgldrg-1 DW. Content...
The increasing demand for paper in Asia is being met by the use of Eucalyptus urophylla to a large extent. However, some pulp mills may be forcedly closed because the Eucalyptus urophylla chips contain extractives severely enough to pollute the water. In this paper, the chemical components in the benzene/ethanol extractives of Eucalyptus urophylla chips were isolated and identified by Py-GC/MS to...
Wood extractives for bioenergy with high additional value is looked upon as a strategy task. In this paper, the chemical components in the benzene/ethanol extractives of Eucalyptus urophylla wood were isolated and identified by Py-GC/MS so as to increase economic benefits. In this paper, the chemical components in the acetic ether extractives of Eucalyptus urophylla wood were isolated and identified...
As a waste in pulp, the acetone extractives of Eucalyptus urograndis wood severely polluted the water and wasted a lot of bleaching agents. Therefore, Py-GC/MS was used to analyze high-grade bioenergy utilization of acetone extractives of Eucalyptus urograndis wood. The relative content of each component was determined by peak area normalization. 33 compounds in the extractives were identified. The...
Wood extractives for bioenergy with high additional value is looked upon as a strategy task. In this paper, the chemical components in the benzene/ethanol extractives of Eucalyptus urophylla wood were isolated and identified by Py- GC/MS so as to increase economic benefits. The relative content of each component was determined by peak area normalization. 73 compounds in the extractives were identified...
Summary form only given. Processing of materials in high power microwave field is unique in many ways. The process is fast, energy efficient and environment friendly. Wide variety of materials, such as, insulating ceramics, semiconductors, metals and metallic compounds have been microwave processed. In many situations, it offers choice to choose an appropriate processing route. Materials, for example,...
This paper proposes an unsupervised approach to automatically interpret noun compounds using semantic similarity. Our proposed unsupervised method is based on obtaining a large amount of robust evidence for NC interpretation. In order to obtain evidence sentences for semantic relations (SRs), we first acquired sentences containing both a head noun and its modifier in the form of SR definitions. Then...
In the present study, we investigated the effect of the rhamnolipid biosurfactant on the threshold level for dechlorination at polychlorinated biphenyl (PCB) concentrations of 40, 60 and 120 ppm. When the extent of dechlorination was examined with the time course of incubations, the surfactant amendment enhanced the rate of dechlorination at all concentrations and the rate was also faster at higher...
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