Advanced Materials Research Vols. 791-793

Abstract: Carotenoids are groups of important bioactive compounds,which possess such important physiological active functions as antioxidant, anti-aging, and preventing cancer or cardiovascular disease. In China, it is rich in fruit resources whose processing wastes contain large amount of carotenoids. With the rapid development of modern detection methods, many advanced technologies have been employed to extract and purify them from fruit wastes, effectively utilizing their active compounds. The biological actions and the newest extraction and purification methods of carotenoids from fruit pomace are reviewed in this paper, making contributions to their further study and industrialized developments.

Abstract: Three drugs such as atropine sulfate ,vitamin C, aminophylline were simultaneously determined by a spectrophotometric method comined with the aid ofchemometrics .The result revealed that the principle component regression and the partial least square method overcome the overlapping of their absorption curves in the UV spectral region.It was shown that the predictive errors obtained by the PCR method was 1.59%. Recovery of the method by standard addition method was respectively valued 100.31% (for atropine sulfate) and 99.42% (for vitamin C) and 97.11% (for aminophylline),.

Abstract: The purpose of this paper is to investigate the impact of vacuum microwave drying on the quality of okra. The curves of colour, fracture resistance, rehydration ratio and the content of vitaminC were obtained at various drying times, vacuum degrees and microwave powers. Results showed that an increase in drying time and microwave power resulted in serious colour change when compare the dry product to fresh okra. However, the higher the vacuum, the slighter the colour changed. The fracture resistance decreased and the brittleness was good when drying time was increased to high level of 14min and 16min. Increasing vacuum degree also made fracture resistance decreased; rehydration ratio increased with the time and microwave power increased, but decreased if the time exceeds 14min. The rehydration ratio of okra is also affected by the vacuum degree, increasing which led the rehydration ratio increased significantly at the beginning of drying and then slowly; the greater the drying time and microwave power, the more lost of vitaminC, however, higher vacuum degree was found to be beneficial to save the vitaminC.

Abstract: The multistage aperture nanofibrous composite scaffolds were fabricated by frozen extraction combined with particle leaching from a PLLA/PCL/HA/dioxane/ ethanol ternary system. and then the morphology and biological activity of composite scaffolds were analyzed. Results show that adding the porogen is advantageous to the formation of multistage aperture nanofiber composite scaffolds. And HA adds more conducive to the deposit of CHA on composite scaffolds, raises the biologic activity of the composite scaffold.

Abstract: In order to research the possibility of separating the azeotrope of ethyl acetate + acetonitrile with ionic liquid as the extractant. Isobaric vapor-liquid equilibria for the ternary system ethyl acetate + acetonitrile + 1-octyl-3-methylimidazolium tetrafluoroborate ([OMIBF₄) were measured at 101.32 kPa using a recirculation still. The results showed that the VLE of the ternary system was different from that of the binary system. The ionic liquid (IL) studied showed a slight crossover salt effect, which changed the relative volatility of ethyl acetate to acetonitrile and eliminated the azeotropic point when the mole fraction of IL in the liquid phase was greater than 0.05. Therefore, [OMIBF₄ can be used as the extractant of extractive distillation for ethyl acetate + acetonitrile system, the suitable mole fraction of [OMIBF₄ is about 10%.

Abstract: Porous hollow hydroxyapatite (HA) microspheres were synthesized by Chemical Precipitation process using Ca (NO₃)₂·4H₂O and (NH₄)₃PO₄·3H₂O as reagents and the CAPB as organic template. With increasing the amount of CAPB, the morphology of HA varies from irregular floccule to the rod form the spherical prototype and then grow into porous hollow microspheres. Furthermore, the possible formation mechanism of morphology change is also discussed.

Abstract: The surface tension, CMC, HLB, emulsifying ability and hydrolytic stability of the polyether-modified trisiloxane surfactants were tested. The hydrolytic stability of different products was compared.

Abstract: Concentrations, spatial distribution, seasonal distribution of volatile phenols were investigated in the surface water of the Taizi River in Liaoning Province, northeast of China. Samples were collected from upstream to downstream locations of the mainstream, and also from the tributaries of the Taizi River in dry season, wet season, and normal season, respectively. Five important industrial point sources were also monitored. The volatile phenol concentrations in the mainstream and tributaries ranged from 0.001 to 0.055 mg/L in the dry season, 0.010 to 0.120 mg/L in the wet season, and 0.010 to 0.56 mg/L in the normal season. The average concentrations of volatile phenol in the surface water increased by the order of dry season > normal season > wet season. The concentrations of volatile phenols were correlated significantly among the three seasons (p< 0.05).

Abstract: A new method is proposed to treat attapulgite by freeze-dying and heating process. The photos of Scanning Electron Microscopy (SEM) on treated attapulgite show higher dispersion properties. TG and DSC curves of raw attapulgite and treated attapulgite indicated the contents of adsorption water, zeolite water and complexing water in the treated attapulgite are less than that of raw attapulgite. The test results of Nickel adsorption indicated the adsorption mechanism could be better described by pseudo-second order model and the thermodynamic curve of adsorption could be described with Langmuir model.

Abstract: Leaf extract of some kinds of Michelia plants could inhibit the activity of cholinesterase.Their inhibitory effect order was Michelia foveolataMerr.exDandy >Michelia maudiae >Michelia figo >Michelia shiluensis Chun et Y. F. Wu >Michelia crassipes Law >Michelia platypetala >Michelia skinneriana Dunn >Michelia wilsonii Finet et Gagnep. >Michelia balansae (DC.)Dandy. Among them inhibitory effect of Michelia balansae (DC.)Dandy was slightly.Leaf extract of Michelia viritepala Law et Zhou ined could activate the activity of cholinesterase. Leaf extract of Magnolia coco (Lour.) DC could inhibit the activity of cholinesterase.