PURIFICATION OF GINKGO LEAVES EXTRACT WITH MACROPOROUS ADSORBENT BASED ON UREA—FORMALDEHYDE CONDENSED POLYMERS

The relationship between the adsorption properties for the active components of ginkgo leaves and the structure of the adsorbents based on urea-formaldehyde condensed polymers was investigated.The results revealed that these adsorbents showed very high adsorpton selectivity for both flavonol glycosides and terpene lactones contained in ginkgo leaves.Thus,an adsorption separation procedure for purification of ginkgo leaves extracts was developed.     

SYNTHESIS AND STRUCTURE OF MACROPOROUS MA—TMPTA COPOLYMERS AND THEIR APPLICATION IN ADSORPTION OF FLAVONOIDE FROM GINKGO LEAVES EXTRACT

Spherical macroporous copolymers of methyl acrylate and trimethylopropane triacrylate with different surface and pore structure were synthesized via suspension polymerization.and their surface and pore structure were characterized by measurements of surface area,apparent density and skeleton density and calculation of average pore diameter,The results revealed that crosslinking degree and porogent determined the physical structure of these copolymers.Some of the copolymers were applied to adsorptive purification of ginkgo leaves extract to enhance the content of flavonoids,the results showed that most of the copolymers could by used to increase the flavonids content.     

SYNTHESIS AND STRUCTURE OF MACROPOROUS MA-TMPTA COPOLYMERS AND THEIR APPLICATION IN ADSORPTION OF FLAVONOIDS FROM GINKGO LEAVES EXTRACT

1 INTRODUCTIONAdsorption by macroporous polymeric adsorbents is one of tile important methods inpurification of ginkgo leaves extract ill. Amberlite XAD-7, a macroporous polymeric adsorbentbased on methyl methacrylate - trimethylolpropane triacrylate copolymer, was reported to use inadsorptive purification of ginkgo leaves extract and other natural products containing flavonoidsfi.3]. Interaction between the adsorbent and flavonoids is based on hydrogen bonding between theester carbonyl-…     

STUDY ON THE TREATMENT OF 3—PHENOXY—BENZALDEHYDE INDUSTRIAL WASTEWATER WITH POLYMERIC ADSORBENT

In this paper,the two effluents from PBA (3-phenoxy-benzaldehyde) production process were treated by polymeric adsorbent CHA-111.PBA or PBC (3-phenoxy-benzoic acid) was recovered from the wastewater in the process of neutralization.As a secondary treatment method,adsorption with CHA-111 showed better efficiency than photocatolytic decomposition and solvent extraction.The optimal technological parameters were:adsorption:current velocity:2.0BV/hr(bed volume per hour),room temperature;desorption:current velocity:2.0BV/hr(bed volume per hour),room temperature;desorption:current velocity:1.0 BV/hr,80℃,8% sodium hydroxide aqueous solutions.In conclusion,99.9% COD in the neutralizing wastewater and 98.4% COD in the hydrolysis wastewater are removed successfully.     

CONDUCTIVITY METHOD APPLIED TO THE STUDY OF INTERACTION BETWEEN ADSORBENT AND ADSORBATE I．ADSORPTION OF LOW CONCENYRATION OF FREE ACID BY REGENERABLE CHITIN

The adsorption of low concentration of free acid by regenerable chitin is followed by electric conductance determination.The effect of acid concentratioin,content of functioinal amino groups,and ionic strength on adsorption was discussed.Experimental results indicate that the active centre of regenerable chitin is the free amino groups on ist surface ,and that the rate of adsorption of free acid was found to be affected by two factors:the interaction between the adsorbent and the adsorbate in solution and that between the adsorbate molecules or ions in solution.     

A STUDY ON THE SPECTRUM CHARACTER AND PHOTOSTABILIZATION ABILITY OF A NOVEL UV-ABSORBER-DIBENZOYL METHANE

The absorption and fluorescence spectra of dibenzoyl methane have been studied. From the absorption spectra it was found that there are two peaks locating at 252 nm and 340 nm, respectively, similar to that of o-hydroxy benzophenone which can form intra-molecular hydrogen bond. Besides, an uncommonly large Stoke's shift of fluorescence can be observed in fluorescence spectra. The photostabilizing effects of dibenzoyl methane and UV-531 on the photodegradation of poly (cis-1, 4-butadiene) in solution have been investigated and compared. A possible mechanism was discussed.     

PREPARATION OF POLYMER—SUPPORTED RCpCpTiCl2 AND APPLICATION IN CATALYTIC ISOMERIZATION OF 1,5—HEXADIENE

Polymer-supported RCpCpTiCl2(Cp=η^5-C5H4;RCp=η^5-RC5H4)have been prepared and reduced by i-C3H7MgBr in situ，then used in catalytic isomerization of 1,5-hexadiene.The isomerization of 1,5-hexadiene leads to a mixture of cyclic and linear products.The ratio of cyclic to linear product depends on the nature of the supporter and the substituent on the cyclopentadienyl ring.The former contributes the most,for example,silica supported Cp2 TiCl2 gave cyclic-linear ratio of 99/1,while for polymer-supported Cp2TiCl2 species,linear compounds are the major products and the ratio of cyclic to linear product changes with different R groups on the cyclopentadienyl ring.     

AGE OF THE LONGYIN FORMATION IN SOUTHWEST GUIZHOU PROVINCE——A DISCUSSION ABOUT THE CORRELATION OF THE LOWER PERMIAN BETWEEN SOUTH CHINA AND THE URAL OF USSR

The Permian Artinskian age of the Longyin Formation is indicated by the appearanceof the ammonoid Popanoceras fauna at its lowermost part. The upper Maping Formationin South China should include all the Sakmarin deposit at least.     

STUDY ON THE ADSORPTION OF OXIDATION OF CROSSLINKED β—CYCLODEXTRIN AND ITS CXOMPOSITE ADSORBENT WITH DIALYTIC MEMBRANE

An urea adsorbent with an aldo structure was obtained by the oxidation of a crosslinked β-cyclodextrin polymer.The highest urea adsorption capacity reached 56.7mg/g in 0.05Maqueous phosphate buffer 37℃ and pH=7.4,and decrease to 4.8mg/g in in aqueous human serum albumin.The composite adsorbent was prepared by the oxidation of a crosslinked β-cyclodextrin and dialytic membrane.It was found that the composite adsorbent has a higher urea adsorption selectivity and capacity compared to that of the oxidation of a crosslinked β-cyclodextrin adsorbent when urea is in aqueous human serum albumin.     

ORIGIN OF MONOAMINERGIC INNERVATION OF THE NUCLEUS RAPHE MAGNUS——A COMBINED MONOAMINE HISTOCHEMISTRY AND FLUORESCENT RETROGRADE TRACING STUDY IN THE RAT

By the use of the fluorescent retrograde tracer, Fast Blue (FB), in combination with monoamine fluorescence histochemistry, the origin of monoaminergic input to the region of the nucleus raphe magnus (NRM) was investigated in the rat. After mieroinjection of FB into the NRM, a great number of FB-laboled NA-containing cells were found in the region of the nucleus reticularis lateralis (corresponding to A1 NA areas), the reticular formation just dorsolateral to the nucleus olivaris inferior (corresponding to the A3 NA area), the ventral part of the locus coeruleus (A6 NA area), and the lateral parts of the nucleus raphe dorsalis (B7 area). In the other NA cell groups of the brain stem, FB-labeled cells could not be observed. Serotoninergic input originating from nucleus raphe obscurus (B2), nucleus raphe pallidus (B1) and nucleus raphe pontis (BS-B6) to the NRM was also observed. A large number of cells containing serotonin (5-HT) in the B2 and B6 areas were labeled by FB, while only a few FB-labeled 5-HT     

TREATMENT AND RESOURCE REUSE OF 1，2，4—ACID PRODUCING EFFLUENT WITH MACROPOROUS POLYMERIC ADSORBENT

The treatment and resource reuse of 1,2,4-acid producing wastewater by self-mademacroporous adsorption resin ND,A-107 was studied in this paper. Optimum adsorption anddesorption process parameters were acquired by systematically study. The polymeric resin NDA-10 7indicated good adsorption & desorption of 1,2, 4-acid in the wastewater. The removal efficiency of1,2,4-acid, CODer is about 78%, 72% respectively. It is evident that this adsorption process is anefficient treatment method for 1,2,4-acid producing wastewater. At the same time, the accumulationand resource reuse of l,2, 4-acid can be realized in this process.     

ANIONIC SYNTHESIS OF A “CLICKABLE” MIDDLE-CHAIN AZIDE-FUNCTIONALIZED POLYSTYRENE AND ITS APPLICATION IN SHAPE AMPHIPHILES

"Click chemistry" is, by definition, a general functionalization methodology (GFM) and its marriage with living anionic polymerization is particularly powerful in precise macromolecular synthesis. This paper reports the synthesis of a "clickable" middle-chain azide-functionalized polystyrene (mPS-N3 ) by anionic polymerization and its application in the preparation of novel shape amphiphiles based on polyhedral oligomeric silsesquioxane (POSS). The mPS-N3 was synthesized by coupling living poly(styryl)lithium chains (PSLi) with 3-chloropropylmethyldichlorosilane and subsequent nucleophilic substitution of the chloro group in the presence of sodium azide. Excess PSLi was end-capped with ethylene oxide to facilitate its removal by flash chromatography. The mPS-N3 was then derived into a giant lipid-like shape amphiphile in two steps following a sequential "click" strategy. The copper(I)-catalyzed azide-alkyne cycloaddition between mPS-N3 and alkyne-functionalized vinyl-substituted POSS derivative (VPOSS-alkyne) ensured quantitative ligation to give polystyrene with VPOSS tethered at the middle of the chain (mPS-VPOSS). The thiol-ene reaction with 1-thioglycerol transforms the vinyl groups on the POSS periphery to hydroxyls, resulting in an amphiphilic shape amphiphile, mPS-DPOSS. This synthetic approach is highly efficient and modular. It demonstrates the "click" philosophy of facile complex molecule construction from a library of simple building blocks and also suggests that mPS-N3 can be used as a versatile "clickable" motif in polymer science for the precise synthesis of complex macromolecules.     

A NOVEL IN－SITU SPECTROELECTROCHEMICAL TECHNIQUE WITH PROBE BEAM DEFLECTION：FOR STUDY OF THE ION EXCHANGE BETWEEN FILMS ON ELECTRODE SURFACE AND SOLUTIONS

ＡＮＯＶＥＬＩＮ－ＳＩＴＵＳＰＥＣＴＲＯＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＴＥＣＨＮＩＱＵＥＷＩＴＨＰＲＯＢＥＢＥＡＭＤＥＦＬＥＣＴＩＯＮ：ＦＯＲＳＴＵＤＹＯＦＴＨＥＩＯＮＥＸＣＨＡＮＧＥＢＥＴＷＥＥＮＦＩＬＭＳＯＮＥＬＥＣＴＲＯＤＥＳＵＲＦＡＣＥＡＮＤ...     

A THEORETICAL STUDY ON THE STRUCTURES AND ENERGIES OF DIMER AND TRIMER OF DELTIC ACID （2，3—DIHYDROXYCYCLOPROPENE—1—ONE）

<正> The structures of deltic acid,its diner, and its trimer have been studied by semiempirical chemical method AMI.The stabilization energies of dinerization and trinerization are 32 and 65 kJ/mol- aspectively. The length of hydrogen-bond R(O...H-0) in diner is 3.04A,while the sane bond is slightly longer in trimer(R=3.06A).     

THE SYNTHESIS AND CHARACTERIZATION OF SOME POROUS CROSS—LINKED POLY （VINYLACETOPHENONE） RESINS AND THEIR CAPACITIES IN ADSORBING GYPENOSIDES

In search of a suitable adsorbent used for the enrichment and separation of natural saponins from an aqueous solution,a series of porous cross-linked poly (vinylaceto-phenone) resins I-Ⅸ were synthesized via the Friedel-Crafts acylation of styrene-divinyl-benzene copolymer beads.Their carbonyl contents were characterized by infrared spectra and elemental analysis.Their physical properties such as bulk densities,skeleton densities,and specific surface areas were also determined.The tests for the resins adsorption of gypenosides showed that only those resins with high carbonyl contents and large specific surface areas could favorably adsorb gypenosides from an aqueous solution with much higher capacities.     

HYDROLYSIS TRANSFORMATION OF A POLYSTYRENE—b—POLY（tert—BUTYL ACRYLATE） COPOLYMER AND MICELLIZATION PROPERTIES OF THE HYDROLYZED COPOLYMER

A very mild and extremely efficient hydrolysis method for transformation of polystyrene-b-poly(tert-butyl acrylate)(PS-b-PtBA)to polystyrene-b-poly(acrylic acid)(PS-b-PAA) was designed and carried out using more convenient and inexpensive chlorotrimethylsilane/sodium iodide as reagents.The hydrolysis product can self-assemble in aqueous media to give regular micelles with PS block forming the core and PAA block forming the corona,or in tetrahydrofuran (THF) to give reverse micelles with the hydrophilic block in the core.     

A NOVEL IRON—SULFUR—THIOLATE BASKET CLUSTER：CRYSTAL STRUCTURE OF Fe6S5（μ—SPh）（P—n—Bu3）4（SPh）2

<正> Fe6S5 (u-SPh) (P-n-Bu3)A (SPh )2, Mr = 1632. 21 , triclinic, P1, a = 11.877(3), b=14. 302(3), c= 24. 920(2) A ,a= 94. 84 (2), B = 96. 59 (2), y = 100. 44(2),V= 4111.7(13)A3,Z=2,Dx==1. 32gcm3,MoKa(0. 71069A),u=13.4 cm-1,F(000) = 1726,T=293K,R(Ru) = 0. 077(0. 060) for 6042 observed (I>3o(I)) reflections.     

THE PREPARATION OF CROSSLINKED N，O—CARBOXYMETHYL CHITOSAN RESINS AND THEIR ADSORPTION PROPERTIES FOR TRIGLYCERIDE IN SERUM

Crosslinked N,O-carboxymethyl chitosan resins which can selectively adsorb triglyceride,were prepared by the reaction of N,O-carboxymethyl chitosan with glutaraldehyde solution.Adsorption experiments were performed by adding the resins to the serum.The results showed that this type of adsoirbent could cut down the concentration of triglyceride in serum by 56.4%(3.35mg/g resin)at most,while concentration of the total protein(TP) decreased only by 10.9% at least,so this novel adsorbent can be used to cure hypertriglyceridemia by hemoperfusion in the future.