Papers by Keyword: β-Cyclodextrin

Abstract: The effect of the pH of the preparing solution on the size and shape of gold nanoparticles was studied in the solution containing soybean peptides or β-cyclodextrin (β-CD) as reducing agent. The resulting gold nanostructures were characterized by transmission electron microscopy (TEM), XRD and UV-vis spectra. Different shape of gold nanoparticles such as nanoplates, networked nanowires and spheres were prepared by changing the pH of solution. Electron diffraction pattern showed that the shape changes from plate or network to sphere as the pH of solution is increasing.

Abstract: β-cyclodextrin (β-CD) incorporated polyacrylonitrile (PAN) composite nanofibers were successfully prepared by using electrospinning technique and used as a novel adsorbent for the elimination of dyes from aqueous solution. The formations of bead-free and uniform nanofibers were obtained using various compositions of homogeneous solution of β-CD and PAN in N,N-dimethylformamide (DMF). The morphology and structure of nanofibers were determined and characterized by SEM, XRD, TGA, and FTIR analysis. The adsorption performance of prepared nanofibers was examined by using methylene blue (MB) and methyl violet (MV) as adsorbate. Results showed that β-CD/PAN nanofibers were achieved equilibrium point within 2h with 96.21 % and 94.37 % adsorption of MV and MB, respectively at ambient condition. In addition, adsorption capacity of nanofibers was studied under different experimental conditions and their effects on adsorption capacity such as temperature, pH, and contact time. The regeneration of β-CD/PAN nanofibers were carried out using methanol and re used five times as an adsorbent, Results indicates that regenerated adsorbent was adsorb 89.0% and 85.22 % of MV and MB, respectively in 5th cycle.

Abstract: A novel cyclodextrin (CD) grafted polyvinyl alcohol (PVA) material has been synthesized. Beta-cyclodextrin (βCD) is chemically grafted into PVA via glutaraldehyde (GA) in acidic medium (HCl). The reaction mechanism and the membrane surface grafting are confirmed by Fourier Transform Infrared Spectroscopy (FTIR), modulus of elasticity and contact angle determination. An amount of PVA and βCD are dissolved in a pH 3 HCl solution at 90oC with continuous stirring. Glutaraldehyde was slowly added into the clear solution to effect grafting and crosslinking between the PVA and βCD. It was cooled and allowed to stand overnight to eliminate bubbles formed. The clear PVA-GA-βCD material is casted on a glass plate to form membranes which are peeled off after subsequent drying. The grafted and crosslinked membrane showed peaks in the IR spectra confirming the chemical bonding between PVA, GA and βCD. PVA-GA-βCD membrane is 6% stronger than the physically blended membrane as shown by the increase of its modulus of elasticity. Likewise, a reduction in the hydrophilicity is observed by the newly synthesized membrane as shown by the increase of the membrane’s contact angle.This newly developed material with immobilized βCD may significantly improve the performance of PVA-CD pervaporation membranes by reducing the phase separation phenomenon due to agglomeration of CD in high concentrations as well as preventing βCD from dissolving in aqueous feed. Moreover, this may open new perspective for the development of high performance nanofibers and other nanomaterialssuch as drug delivery system materials and inclusion complexes.

Abstract: The antifungal PVA film was fabricated by addition of the clove oil/β-cyclodextrin (β-CD) inclusion complex into PVA. The migration of clove oil in different food simulation solution (A: 10% ethanol water. B: 50% ethanol water. C: 60% glycerin-water mixture. D: n-hexane) were evaluated by using solution food simulation and then treated with linear regression analysis. The diffusion coefficient was cultivated out by Matlab software. The migration of clove oil which was embedded by β-CD in PVA film was influenced by the quality of food simulation solution to a great degree and the relation among the migration rate was A>B>D>C. The film structure was loosed and the migration gallery was increased by adding clove oil/β-cyclodextrin inclusion complex. The migration amount in simulations was positively correlated with time and diffusion coefficient.This kind antibacterial film can be used in low water activity food system and kept long-term antibacterial action.

Abstract: The poly(pseudo)rotaxanes formed by β-CD and F127 was used as the template to prepare the mesoporous silica. The specific surface area, pore size distribution and pore volume of the mesoporous silica could be controlled by simply changing the poly(pseudo)rotaxanes forming time. A series of samples with different template forming time were prepared to investigate the various specific surface area and pore size of the mesoporous silica. The morphology, composition, specific surface area and pore size of the mesoporous silica particle were investigated by the scanning electron microscopy, Fourier transformation infrared spectroscope, and N2 adsorption–desorption measurement.

Abstract: The supramolecular interaction of BPO and ß-CD has been studied by spectrophtometry. The mechanism of the inclusion was studied. The results showed that ß-CD react with BPO to form a 2:1 or 1:1 host-guest complex.The ß-CD reacts with benzoic acid to form a 1:1 host-guest complex after the BPO was reduced by hydroxyl ammonium chloride.Based on the enhancement of the absorbance of BPO produced through complex formation, a spectrophotometric method for determination BPO in bulk aqueous solution in the presence of ß-CD was developed. A linear relationship between the absorbance and BPO concentration was obtained in the range of 0.2～50 μg.ml^-1. The proposed method was used to determine the BPO in the flour with satisfactory results. The principal advantage of the proposed method is its excellent selectivity based on molecule recognition of ß-CD and simple.

Abstract: In order to graft β-cyclodextrin onto chitosan fibers as more as possible, amino group of chitosan fibers should be protected by benzaldehyde firstly. Based on the similar structure of chitosan and cellulose fibers, different experimental programs were employed to discuss the possibility of β-cyclodextrin grafted onto chitosan fibers in the similar method. By infrared spectral and UV–visible spectroscopy analysis, the results showed although benzaldehyde could be grafted to chitosan fibers successfully to protect amino group, β-cyclodextrin could not be grafted further.

Abstract: In order to get Perilla frutescens (L.) seed oil (PSO) inclusion compound with β-cyclodextrin (β-CD). The ultrasonic induced preparation parameters was studied. Basis on the signal factor test, an orthogonal experiment L9(3)4 was applied to optimize the best preparation conditions. The optimum preparation parameters were determined as follows: ultrasonic power200W, ultrasonic time20min, inclusion temperature 48°C and ratio of PSO to β-CD 1:5 (ml/g). Under optimized conditions, the inclusion ratio was 81.1%. All the results indicated that ultrasonic induced preparation of PSO inclusion compound with β-CD was a suitable method for it has shorter time and higher inclusion ratio.

Abstract: To study the characterization of ursolic acid (UA) and β- cyclodextrin(β-CD) inclusion complex which prepared by ultra-high pressure method. Inclusion complex of UA /β-CD was prepared at 100MPa and 500MPa. The inclusion complex was characterized by IR spectra, X-ray diffraction, Differential scanning calorimetry and Scanning electron microscope. It was testified that the inclusion complex was formed between β-CD and UA at ultra-high pressure conditions.

Abstract: In this study, monochlorotriazinyl-β-cyclodextrin (MCT-β-CD) was prepared from the reaction between cyanuric chloride and β-cyclodextrin (β-CD). The structure of the product was confirmed by FTIR, 1HNMR and ESI-MS. It is found that the yield of the MCT-β-CD was 61.72% and the average substitution degree (DS) of-OH in MCT-β-CD was 1.43. The water solubility of MCT-β-CD is 0.40 g/mL at room temperature.