Papers by Keyword: Sodium Periodate

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Authors: Xin Liu, Yun Hui Xu, Wei Wei Zhang
Abstract: With science and standard of living progressing, functional textile become more and more popular. We reported that a new bamboo pulp fiber fabric with the chitosan modification (CMBPFF) was prepared by the selective oxidation of sodium periodate and then treatment with a solution of chitosan aqueous acetic acid. The resulting CMBPFF is a nonpolluting and eco-friendly fabric product through the method of natural raw materials and no additives, which not only increase the added value of the product but also achieve natural ecological fabrics. This research using Kjeldahl nitrogen analysis showed that the maximum percentage of chitosan crosslinked on bamboo pulp fiber fabric was 10.52% (w/w). FT-IR spectra characterization suggested that the imine covalent bond between the chitosan and the oxidized bamboo pulp cellulose was formed through a series of reaction. The breaking strength of the modified fabric remained basically unchanged when the concentration of sodium periodate was less than 2.0 mg/ml. Furthermore, the chitosan modified bamboo pulp fiber fabric had the good antibacterial property. The wrinkle recovery angle and moisture regain of the chitosan modified fabric were improved. Meanwhile, a model experiment for the controlled release the drug was investigated using cactus extracts, a component of a Chinese medicine, indicated the extensive applicability of CMBPFF as a carrier for the controlled release drugs.
1231
Authors: Wan Ting Niu, Lu Yao Zhang, Min Pan, Yu Quan Chen
Abstract: Superparamagnetic iron oxide (SPIO) nanoparticles were used more and more universally in biomedical research recently. In order to develop a suitable immuno-magnetic probe which can be applied in antigen-antibody based immunoassay, such as tumor marker or cardiovascular marker detection, SPIO capped by dextran was synthesized with chemical coprecipitation method. With sodium periodate method, hydroxyl groups of dextran were oxidated to aldehyde groups, thus conjugated with antibodies by covalent bonds. Western blot pattern illustrated that structure integrity of the most antibodies was kept well, harmful influence given by oxidation of conjugation was very finite. Both immune reactivity and antigenicity of antibodies in the SPIO based immunoprobes were retained effectively. This probe has a potentially application in SPIO based novel suspension array for its superparamagnetic property that can be separated under gradient magnetic field.
1089
Authors: Hui Ping Jin, Bai Qing Zhou
Abstract: The starch is oxidized to dialdehyde starch by sodium periodate and condensed with urea to generate shrimp feed adhesive. The experimental result shows: Blend 38g starch to 150ml H2O, concoct 15g sodium periodate to PH 1~1.5, heat it for 2 hours within 35~40°C, flush it 4 times and filter it to obtain dialdehyde starch with 15% dialdehyde; Blend the dialdehyde starch to 200ml H2O, and stir it uniformly, concoct it to PH 8.5~9 with alkali, heat it up to 95~98°C, add 7g urea first, 30 minutes’ reaction later, add another 3g urea. After1 hour’s reaction, concoct it to PH 4~5 with acid. After 1~2 hours’ polycondensation, concoct it to PH 7~8 with alkali, and a liquid adhesive is formed. The shrimp feed could be insoluble for 2 hours in water when added 1% adhesive.
1317
Authors: Yun Hui Xu, Xiao Li Zhang
Abstract: In order to take advantage of specific properties of sericin to develop cotton fabrics with the healthcare function, the cotton fabric modified with sericin (SMCF) was prepared by the periodate oxidation and subsequent treatment with sericin solution. The aldehyde groups in molecular chains of the oxidized cotton fabric crosslinked with the amino groups of sericin to form the chemical bond of Schiff’s base. The effects of periodate concentration, reaction temperature, sericin concentration and treatment time on the finishing process were investigated. The optimum finishing technology for cotton fabric was obtained. XPS analysis of the modified cotton fabric showed a characteristic peak of nitrogen element at 400.0–404.0 eV, which suggested that the sericin was fixed on the surface of cotton fabric through the Schiff’s base. The anti-ultraviolet property of the resulting SMCF improved. The breaking strength and whiteness of the modified fabric slightly decreased, whereas the moisture regain and wrinkle recovery angle of sericin treated fabric remarkably increased.
2579
Authors: Naoki Nakajima, Hajime Sugai, Sadami Tsutsumi, Suong Hyu Hyon
Abstract: To improve the conventional and commercially-available medical adhesives such as cyanoacrylate, aldehyde-based, and fibrin glue, new bioadhesive has been prepared using medical and food additives as starting materials. Aldehyde groups could be easily introduced in dextran in the presence of sodium periodate in aqueous media, and the extent of the introduction could also be controlled. In vitro degradation speed of the hydrogel prepared by mixing of aldehyded dextran with ε-poly(L-lysine) at 37oC significantly varied by acetic anhydride concentration added to ε-poly(L-lysine) from < 5h to > 5 weeks. Bonding strength of the glue was 4 times higher than that of commercial fibrin glue and almost no cytotoxicity was observed, suggesting the development of novel self-degradable bioadhesive.
713
Authors: Hai Yan Zhang
Abstract: The surface modification process for cotton fabric which was oxidized first, and then crosslinked with collagen was studied. The optimum oxidation process was as follows: concentration of sodium periodate 0.6g/L, time 2.5h, temperature 40°C, ratio of water and cotton fabric was 100:1. The method for surface modification of cotton fabric was determined from comparative analysis, and the optimum process: collagen solution concentration 6%, glutaraldehyde concentration 5%, reaction 40min at 30°C, ratio of water and cotton fabric was 100:1. Compared with original cotton fabric,the breaking strength and elongation of collagen modified cotton fabric decreased, while the dyeing percentage with acid dyes was increased and this means the surface of modified cotton fabric was covered with a large component of collagen.
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