Papers by Keyword: β-Cyclodextrin

Abstract: Application of citric acid (CA), as cross-linking agent, on grafting β-cyclodextrin (CD) to cotton was studied. Some influence factors on the grafting of β-cyclodextrin, such as the concentration of CA, β-cyclodextrin and catalyst, curing conditions (temperature, time) were discussed. The grafting procedure was to soak the fabric samples in an aqueous solution containing β-CD 60 g/L, citric acid 100 g/L and sodium hypophosphite 30 g/L, then the squeezed samples were dried and cured at 190°C for 4 min. The cotton fabric grafted with β-cyclodextrin and then perfumed with menthol preserved 27.04% menthol after ten days, and its anti-bacterial performance was observed.

Abstract: The aim of the study was to investigate the grafting process of β-cyclodextrin onto chitosan fibers via epichlorohydrin as a crosslinking agent. The parameters influencing the efficiency of the grafting reaction were studied by L9 (34) orthogonal test. The amounts of β-cyclodextrin grafting onto the treated fibers were estimated in terms of levofloxacin content. The optimum process was found to be epichlorohydrin 0.64 ml, temperature25°C, post-reaction time 48h, pre-reaction time 4.5h when chitosan fibers were 0.48g. In the case, the inclusion amount of levofloxacin was 1.792mg/g, and the releasing amount was 0.845mg/g at 35°C. The modified and unmodified fibers were characterized by FTIR Spectroscopy , which indicated that β-CD grafted with chitosan fibers were prepared successfully.

Abstract: The synthesis of a novel chitosan (CTS) derivative bearing β-cyclodextrin (β-CD) was studied, which was divided into two steps. The first step was the preparation of carboxymethyl-β-CD, then it was acyl chlorided. The second step was that β-CD was grafted onto the CTS skeleton by the reaction of acidamide. Its adsorption property on Pb²⁺ was investigated. The factors that influence on the effect were discussed, including adsorption time, pH value, and temperature. The results show that its adsorption content is superior to that of the unmodified CTS. And the adsorption content (Q_max) is 246 mg.g^-1 when the temperature is 35°C, pH is between 3.0~4.0 and adsorption time is 6 h.

Abstract: Nano-ZnO sol solution was prepared by using Zn(CH3COO)2•2H2O as raw material and β-cyclodextrin (β-CD) was added into the sol, then cotton fabric was treaded with the sol by pad-dry-cure technique. Moreover, the fixation fastness of the composite sol on the fabric was improved by adding the adhesives. Based on the tests of anti-UV, photocatalysis, antibacterial and weight gain rate after adsorbing essence, the results showed that the treated cotton fabrics added with β-CD had better adsorbability to essence, anti-bacterial activity, photocatalytic degradation to formaldehyde and excellent anti-UV property.

Abstract: Polyethylene terephthalate (PET) fiber is a kind of widely used textile fiber due to its some desirable properties. However, it limited its application in clothing because of poor hydrophilic property and high static electric. In order to improve hydrophilic and antistatic properties of PET fabrics, β-cyclodextrin (β-CD) was finished onto them with citric acid (CA) as crosslinking agent. SEM showed that β-CD was finished successfully onto PET fibers. Moisture liberation curve indicated that the finished PET fabrics possessed favorable hydrophilic property. However, water vapor transport property of the finished PET fabrics slightly decreased. Antistatic property of PET fabrics finished by β-CD acquired improvement. In addition, tensile properties of PET fabric also were enhanced after finishing.

Abstract: The synthesis chitosan modified by N,N-dimethylformamide(DMF) grafted β-CD (CTS), adsorption experiments of lanthanide ions, a new type water treatment agent, are discussed in this paper. First, the chitosan was modified by DMF, and then β-cyclodextrin (β-CD) was grafted onto chitosan skeleton by epoxy chloropropane. The effects of temperature, pH value, adsorption time on adsorption content were studied. The water treatment agent have a high lanthanide adsorption rate up to 98% compared to chitosan, b-CD and chitosan derivative bearing β-cyclodextrin.

Abstract: A novel β-cyclodextrin (β-CD) grafted titanium dioxide (TiO2/β-CD) was synthesized through photo-induced self assembly methods, and its structure was characterized. The TiO2/β-CD hybrid nanomaterial showed high photoactivity under visible light irradiation (λ  400 nm and/or λ  420 nm) and simulated solar irradiation (λ  365 nm). Photodegradation of rhodamine B followed the Langmuir–Hinshelwood kinetics model. The initial rate R0 of rhodamine B degradation increased by 4.6, 2.4 and 1.5 times in the irradiation conditions of λ  420 nm, λ  400 nm and λ  365 nm, respectively. β-CD increased the lifetimes of the excited states of the unreactive guests and facilitated the electron transfer from the excited dye to the TiO2 conduction band, which enhanced the dye pollutant degradation.

Abstract: The objective of this study was to find out a kind of MIP which was suitable for recognizing NG in aqueous medium. A non-covalent NG-β-CD imprinted polymer was prepared by using β-cyclodextrine (β-CD) as a functional monomer, naringin (NG) as a template molecule and hexamethylene diisocyanate (HMDI) as cross linker. The binding property and selectivity were evaluated by the equilibrium binding experiment, its imprinting factors α is 1.39.

Abstract: A fragrance, jasmine was encapsulated into β-cyclodextrin to prepare microcapsules that can sustain the release of the fragrance and potentially be bound to textile material. This study examined the structures, thermal properties, partied size distributions, and release behaviors of the microcapsules. The release of jasmine was examined in air at elevated temperature. The experiments showed that β-cyclodextrin could efficiently sustain the delivery of jasmine.

Abstract: The ATRP of N-isopropylacrylamide (NIPAM) was carried out in DMF/water at 60 °C to afford a novel linear end-functionalized poly(N-isopropylacrylamide) with acetylated β-CD (AcCD-PNIPAM) and the structures of the products were characterized. The number-average molecular weight (M_n) and the polydispersity index (PDI) of the polymer were obtained from gel permeation chromatography (GPC) analysis. The end-functionalized PNIPAM with β-CD (CD-PNIPAM) was obtained by deacetylation from AcCD-PNIPAM. The lower critical solution temperature (LCST) for the aqueous solutions of CD-PNIPAM, measured by means of ultraviolet-visible spectroscopy (UV-vis), was 4~5 °C higher than that of AcCD-PNIPAM. Ferrocene was included into CD-PNIPAM with mole ratio of 1:1 and the inclusion complex was characterized by cyclic voltammetry (CV) technology.