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      Purification and characterization of hyaluronic acid from chicken combs Translated title: Purificação e caracterização do ácido hialurônico obtido da crista de frango

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          Abstract

          Hyaluronic acid (HA) is an important macromolecule in medical and pharmaceutical fields. The umbilical cord and the chicken comb are some of the tissues richest in this polysaccharide. The profit from obtaining HA from the combs of slaughtered animals is particularly attractive. This work aimed to extract, purify, and characterize HA. The glycosaminoglycan concentration in the chicken comb was found to be about 15µg of hexuronic acid mg-1 of dry tissue. Fractionation using ion exchange chromatography and subsequent identification of the fractions by agarose gel electrophoresis showed that HA corresponded to 90% of the total amount of extracted glycosaminoglycans.

          Translated abstract

          O ácido hialurônico (AH) é uma importante macromolécula nas áreas médica e farmacêutica. O cordão umbilical e a crista de frango constituem uns dos tecidos mais ricos nesse polissacarídeo. O aproveitamento das cristas dos animais abatidos para a obtenção de HA é particularmente atraente. O presente trabalho teve como objetivo a extração, purificação e caracterização do AH. A concentração de glicosaminoglicanos encontrada na crista de frango foi ao redor de 15µg de ácido hexurônico mg-1 de peso seco. O fracionamento por cromatografia de troca iônica e a subsequente identificação das frações por eletroforese de gel de agarose mostrou que o AH corresponde a 90% do total de glicosaminoglicanos extraídos.

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          Improved quantitation and discrimination of sulphated glycosaminoglycans by use of dimethylmethylene blue.

          The dimethylmethylene blue assay for sulphated glycosaminoglycans has found wide acceptance as a quick and simple method of measuring the sulphated glycosaminoglycan content of tissues and fluids. The available assay methods have lacked specificity for sulphated glycosaminoglycans in the presence of other polyanions, however, and have not discriminated between the different sulphated glycosaminoglycans. We now describe a modified form of the dimethylmethylene blue assay that has improved specificity for sulphated glycosaminoglycans, and we show that in conjunction with specific polysaccharidases, the dimethylmethylene blue assay can be used to quantitate individual sulphated glycosaminoglycans.
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            Electrophoretic behaviour of acidic mucopolysaccharides in diamine buffers.

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              Hyaluronic acid containing hydrogels for the reduction of protein adsorption.

              Recently, new contact lens materials have been introduced which are reported to improve comfort by incorporating wetting agents either in a releasable or nonreleasable form. In the present work, model lens materials based on poly(2-hydroxyethyl methacrylate) (pHEMA) were developed which incorporate releasable or crosslinked and therefore physically entrapped hyaluronic acid (HA) of various molecular weights as a wetting agent. Crosslinked HA, despite being only present in very small amounts, resulted in consistently lower water contact angles over 4h in comparison to controls, indicating that HA is present at the interface and was not being released over time. The presence of HA in the material was further confirmed by increases in the glass transition temperature measured by differential scanning calorimetry (DSC), and small increases in the stiffness as measured by Instron testing. This crosslinking procedure appeared to have no effect on optical transparency using 35 kDa HA, whereas small decreases in optical transparency at higher wavelengths were noted for the 169 kDa HA crosslinked material, as measured by UV spectrophotometry. Most importantly, protein adsorption results indicated that the adsorption of all proteins studied was considerably decreased by the presence of the small amount of crosslinked HA. The results provide insight into the mechanisms of comfort improvement with commercially available lens materials and suggest that HA containing materials may have significant potential for use in contact lens applications.
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                Author and article information

                Journal
                cr
                Ciência Rural
                Cienc. Rural
                Universidade Federal de Santa Maria (Santa Maria, RS, Brazil )
                0103-8478
                1678-4596
                September 2012
                : 42
                : 9
                : 1682-1687
                Affiliations
                [01] Santa Maria RS orgnameUniversidade Federal de Santa Maria (UFSM) orgdiv1Departamento de Tecnologia e Ciência dos Alimentos Brasil claudiasr37@ 123456yahoo.com.br
                [02] Rio de Janeiro RJ orgnameUniversidade Federal do Rio de Janeiro (UFRJ) orgdiv1Hospital Universitário Clementino Fraga Filho (HUCFF) orgdiv2Laboratório de Tecido Conjuntivo Brasil
                [03] Florianópolis SC orgnameUniversidade Federal de Santa Catarina (UFSC) orgdiv1Departamento de Ciência dos Alimentos Brasil
                Article
                S0103-84782012000900026 S0103-8478(12)04200926
                10.1590/S0103-84782012005000056
                ee2e2954-6507-4fa2-9a00-28d56fe07d3e

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 23 November 2010
                : 05 June 2012
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 29, Pages: 6
                Product

                SciELO Brazil

                Categories
                Food Technology

                co-produtos de frangos,glicosaminoglicanos,hexuronic acid,chicken combs,glycosaminoglycans,ácido hexurônico

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