Gui Zhen Fang

Preparation of Lignosulfonate-Chitosan Polyelectrolyte Complex

Sodium lignosulfonate -chitosan (SLS-CS) polyelectrolyte complex was prepared by alkaline lignin and chitosan as raw materials. The structure and thermal stability of SLS-CS polyelectrolyte were characterized by FTIR, XRD, DSC. The results indicated that NH3+ was formed by the protonated amino groups of chitosan and then came into SLS-CS polyelectrolyte complex with -SO3Na of sodium lignosulfonate through electrostatic adsorption. Compared with the sodium lignosulfonate and chitosan, the thermal decomposition temperature of SLS-CS raised and thus improved the thermal stability; the amorphous peak tends to decrease; SLS-CS polymer arrangement appeared more ordering, and the molecular interaction were enhanced.

Disodium Sulfodehydroabietate as Template for Preparation of Hydrophobic Nano-Calcium

In this paper, the hydrophobic nano-calcium carbonate (CaCO3) was prepared by organic matter (the bolaform surfactant Disodium Sulfodehydroabietate as template) modifying surface structure of calcium carbonate (made by anhydrous sodium carbonate and anhydrous calcium chloride) at 40°C for 2h. The prepared hydrophobic nano-CaCO3 was characterized by means of Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Transmission electron microscope (TEM) and. The nano-CaCO3 with mean particle size of 64.4 nm was obtained in the range of 0.5~1.5µm by calculation. The contact angle of nano-CaCO3 with liquid solid was 117.49°. The hydrophobic property become stronger.

Preparation of Carboxymethylcellulose Picric Acid Ester and Adsorption Property for Creatinine

Ether of carboxymethylcellulose-based picric acid(CMC-PA) was prepared from carboxymethylcellulose(CMC) and picric acid(PA) by the mild reactive conditions of acidylation with chloric.The strcture of CMC-PA was characterized by FTIR,Element analysis,XRD and CPMAS13C NMR.Influences of reaction conditions,such as reaction temperature,reaction time,ratio of CMC to PA and amount of pyridine,were studied by mass fraction of nitrogen.Result showed that the synthetical conditions were obtained as ratio of CMC to PA 2 : 1 (by weight),amount of pyridine 50 mL,reaction temperature 85°C and reaction time 4 hours.The adsorption property of CMC-PA to creatinine was studied under simulated biological human body conditons.The kinetic and isothermal curve were given. Results showed that adsorption amount reached an equilibrium value after 10 hours,and the maximum adsorption amount was 1.75mg/g.Equilibrium data of creatinine fit well with Freundich equation,indicating that the adsorption was mainly chemical monolayer adsorption .The Freundich indx(1/n) was less than 1,which implied that the adsorption was preferential process.

Anti-Oxidation of Photo-Degradation Alkali Lignin

Photo-degradation alkali lignin was prepared in sunlight by the system of TiO2 and squaraine dye (QSC). The antioxidant activity of photo-degradation was researched. The results showed that the phenolic hydroxyl of degradation alkali lignin is 5.63% with the control is 4.64%, and alcoholic hydroxyl of degradation alkali lignin is 3.21% with the control is 3.77%. The order of antioxidant activity was as following. 2,6-di-tert-butyl-4-methylphenol > high-phenol lignin > the control lignin.

Characterization and Synthesis of a Betaxolol Hydrochloride Intermediate

In this paper, a new method was developed to synthesize betaxolol hydrochloride intermediate (1-[4-(2-Hydroxyethyl) phenoxy]-2, 3-epoxypropane). Based on the acidity difference of phenolic hydroxyl and alcoholic hydroxyl in p-hydroxyphenylethyl alcohol, the betaxolol hydrochloride intermediate was synthesized by selective A.W.Williamson etherification between p-hydroxyphenylethyl alcohol and epichlorohydrin in 18% potassium carbonate-acetone alkalescent solution. The molar ratio of p-hydroxyphenylethyl alcohol and epichlorohydrin was fixed at 1:1.7. FTIR and HPLC analysis revealed that the product purity reached 96% and the yield was 68.18%. This method simplified the synthetic process of betaxolol hydrochloride, which would also result in higher yield and purity of betaxolol hydrochloride products.

Study of Synthesis Process of L-Ascorbic Acid Cellulose Ester

In this article, L-ascorbic acid cellulose ester, a polymer with antioxidant properties, was synthesized using L-ascorbic acid and sodium carboxymethyl cellulose as feedstock. The whole reaction was divided into two parts: the preparation of carboxymethyl cellulose carbonyl chlorides and the synthesis of L-ascorbic acid cellulose ester. The optimal conditions of acyl chloride preparation: ratio (m/v) of CMCH to SOCl2 was 1:3, proportion (m/v) of CMCH to DMF was 1:20, reaction temperature was 110-120°C, reaction time was 2h. The optimal conditions of L-ascorbic acid cellulose ester synthesis: ratio (m/v) of L-ascorbic acid to solvent was 1:3.5, proportion (Mol/Mol) of Carboxymethyl cellulose carbonyl chlorides to L-ascorbic acid was 1:1.3, reaction temperature was 20°C, reaction time was 22h. In this reaction conditions, the synthetic product not only saved the antioxidant activity of the groups, and added the safe and non-toxic ability of dietary fiber.

Comparative Analysis and Assessment on Oxidation Resistance of Proanthocyanidin Extract from Sanguisorba Root

We introduced the oxidation method of Lecithin liposome which induced by Fe2+ and fluorescence chemiluminescence method. The method used to determine the ability of the proanthocyanidin extracted from Sanguisorba of inhibit liposome peroxidation, scavenge superoxide anion(O2－.) and hydroxyl free radical(·OH). We carried out a comparative analysis with rutin, extract of Grape Seed and vitamin E (VE) in antioxidant ability. As revealed in the results, compared the extract of Grape Seeds and VE, the inhibition ratio of proanthocyanidin extracted from Sanguisorba to inhibit liposome peroxidation is 1.62 and 7 times, scavenge superoxide anion (02－.) is 1.6 and 10.15 times and scavenge hydroxyl free radical（.OH）is 1.9 and 29.5 times, respectively. The results demonstrate that proanthocyanidin extracted from Sanguisorba show better antioxidant ability, which further revealed that resource of sanguisorba is more worth exploiting and applying.

Lignin Separation and Antioxidant Capacity from Acanthopanax senticosus Remainders Using Acetic Acid-Water System

Lignin was extracted from Acanthopanax senticosus remainders after pharmaceutical production process, with acetic acid-water as extracting reagent. Four factors effects, namely reaction temperature from 160°C to 220°C, reaction time from 40 min to 100 min, acetic acid concentration from 50% to 80% and solid-liquid ratio from 1:40 to 1:5, were studied and optimized by a four-level orthogonal array design (OAD) on lignin antioxidant capacity. The results indicated the reaction temperature and reaction time were significant factors among these factors. At the same lignin solution concentration, the acetic acid lignin antioxidant capacity was better than that of Kraft lignin, but much lower than that of butylated hydroxyanisole (BHA).

Analysis and Evaluation on Chemical Composition of the Larch Bark

In this paper, Chinese larch bark and different areas of Korean larch bark chemical composition and quantitative analysis of active ingredients, and with several plant resources in the total flavonoids were compared and evaluated. The results showed that: Korean larch bark of ash content (1.34%) lower, phenethyl alcohol extract (16.17%), proanthocyanidins (3.84%), total flavonoids(16.59%) and dihydro-quercetin (4.87% ) the highest. The total flavonoid content is more higher than the development of herbal extracts of total flavonoids. Therefore, the bark is a great potential for development of renewable resources.

Immobilization of Lactase on Dialdehyde Oxycellulose-Coated Magnetite Nanoparticles

Dialdehyde oxycellulose-coated magnetite nanoparticles were prepared as carrier to immobilize the lactase, the preparation conditions and enzymatic properties of the immobilized enzyme were studied. The results showed that the maximum activity of immobilized enzyme is 0.424U/g when immobilized time is 4h, immobilized pH is 6.5, [enzyme]/[carrier] =1:15(g:g). Compared with free enzyme, the heat stability and basic resistance of immobilized lactase were increased. After reuse five times, the relative enzyme activity of immobilized enzyme was 63%.