Bionanocompositional chitosan-silica sorbent for liquid chromatography

Рашидова, С. Ш.; Shakarova, D. Sh.; Ruzimuradov, O.N; Satubaldieva, D.T; Zalyalieva, S. V.; Шпигун, О. А.; Варламов, В. П.; Kabulov, B. D.

doi:10.1016/j.jchromb.2003.10.015

Cited by 75 publications

(34 citation statements)

References 8 publications

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“…Chitosan-silica hybrids present as microparticulate materials showing different shapes have been prepared by the sol-gel method using TEOS or polyethoxysiloxane oligomers in the presence of the biopolymer. These materials can be used as a stationary phase in HPLC [48].…”

Section: Bio-nanohybrids Based On Silica Particles and Siloxane Networkmentioning

confidence: 99%

An Introduction to Bio‐nanohybrid Materials

Ruiz‐Hitzky

Darder

Aranda

2007

Bio‐inorganic Hybrid Nanomaterials

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Section: Bio-nanohybrids Based On Silica Particles and Siloxane Networkmentioning

confidence: 99%

An Introduction to Bio‐nanohybrid Materials

Ruiz‐Hitzky

Darder

Aranda

2007

Bio‐inorganic Hybrid Nanomaterials

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“…Figure 9 shows the close contact between PMMA and chitosan after drying and neutralization. In an acidic environment (pH < 6.5), the negatively charged Si-OH groups at the silica surface of the impacted Rocatec Plus blasting agent interact with the protonated chitosan amino groups (NH3 + ) by electrostatic attraction forces and dipole-dipole interactions [19][20][21][22]. The close molecular proximity may induce other secondary valence forces such as van der Waal forces or hydrogen bonds [23,24].…”

Section: Discussionmentioning

confidence: 99%

Chitosan Coating on Silica-Modified Polymethyl Methacrylate for Dental Applications

et al. 2017

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Abstract:Chitosan is a cationic natural polymer that is widely used as a topical dressing in wound management. Temporary coatings of removable denture bases with chitosan might be useful as supportive treatment in oral medicine. The aim of this study was to analyze the thickness, uniformity, and adhesive strength of chitosan coatings on simulated denture bases made from polymethyl methacrylate (PMMA). According to a standardized protocol, 20 PMMA cylinders (13 mm diameter, 5 mm in height) as well as 20 cubes (a = 25 mm) with intaglio U-shaped profiles were manufactured to simulate average sized alveolar ridges. Cylinders as well as cubes were divided into four test series with n = 5 each. After sandblasting with silica-modified alumina, one frontal surface of the PMMA cylinders and the intaglio surfaces of the U-shaped profiles was coated with chitosan acetate solution according to the following protocols: one layer of 2% chitosan acetate solution (test series I), one layer of 4% chitosan acetate solution (test series II), two layers of 2% chitosan acetate solution (test series III), and two layers of 4% chitosan acetate solution (test series IV). After drying and neutralization with NaOH, each cube was cut transversely and the coating thickness across the U-shaped profile assessed with a light microscope. Adhesive strength was evaluated by simulated tooth brushing and the loss of chitosan coating was evaluated qualitatively. Statistical analysis used Friedman ANOVA test for dependent samples and Kruskal-Wallis test for independent samples, post-hoc Dunn's test (p < 0.05), and binomial test (p = 0.05). The mean chitosan coating thicknesses in the depth of the U-profiles were 71 µm (test series I), 77 µm (test series II), 121 µm (test series III), and 517 µm (test series VI). The thickness continuously decreased with rising angulation of the U-profile side walls. In test series I, the chitosan coating thickness significantly dropped above a 30 • angulation of the U-profile side walls. In test series II to IV, the chitosan thickness drop was not statistically significant at angulations of 30 • and 60 • , but was at 90 • angulation of the U-profile side walls. Adhesion strength was rated fair to good and did not differ significantly among the four test series. The coating technique described revealed chitosan layers with overall good adhesion strength but differing thicknesses. Coatings with one or two layers of 4% chitosan acetate solution allowed a relatively uniform chitosan thickness and thus might be usable in oral medicine.

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“…The shape of silica particles was not homogeneous since the precursor used in the composite was TEOS. Therefore, it caused the particles on the surface membrane seen in different forms (round, oval, rectangular and triangular) [21]. The addition of dithizone made the particle shape was larger because of the silica particle on the chitosan surface was covered by dithizone particle.…”

Section: Characteristics Of Chitosan-silica Membranementioning

confidence: 99%