The interaction between reactive dye containing vinylsulfone group and chitosan microspheres

Kimura, Irene Yukiko; Laranjeira, Mauro C. M.; Fávere, Valfredo T.; Furlan, Lígia

doi:10.1080/714975829

Cited by 21 publications

(8 citation statements)

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“…Both the adsorbent and the dye are completely disassociated, which is attributed to the fact that the adsorbent is a strong basic anionic exchanger and the dye sulfonate is derived from a strong acid. Previous work with microspheres of cross-linked chitosan and RO16 dye indicated that adsorption is dependent on pH [26]. At pH < 3, chitosan is completely protonated and adsorption is principally attributed to ionic interaction between its cationic sites, the protonated polymer groups and the dye sulfonate groups.…”

Section: Adsorbent Characterizationmentioning

confidence: 98%

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Cross-linked quaternary chitosan as an adsorbent for the removal of the reactive dye from aqueous solutions

Rosa

Laranjeira

Riela

et al. 2008

Journal of Hazardous Materials

130

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Section: Adsorbent Characterizationmentioning

confidence: 98%

“…Table 3 illustrates the capacity of reactive dye adsorption using different chitosan as adsorbent [22,26,27,31,32,[34][35][36][37]42].…”

Section: Adsorption Isothermmentioning

confidence: 99%

Cross-linked quaternary chitosan as an adsorbent for the removal of the reactive dye from aqueous solutions

Rosa

Laranjeira

Riela

et al. 2008

Journal of Hazardous Materials

130

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“…Among its main features include biocompatibility, biodegradability, antibacterial, emulsifying and chelating properties and non-toxicity (Kimura et al, 2002). The benefits provided on the chitosan consumption are innumerous, e.g., regulation of digestive function, fat absorption preventing its absorption by the body, and reduction of sugar and cholesterol levels in the body (Mathur & Narang, 1990).…”

Section: Introductionmentioning

confidence: 99%

Alkali process for chitin extraction and chitosan production from Nile tilapia (Oreochromis niloticus) scales

Boarin-Alcalde

Fonseca

2016

lajar

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ABSTRACT. Chitosan is a biopolymer of wide application due to its characteristics and non-toxicity, presenting antimicrobial, antitumoral and cicatrizing activities. It is currently used as emulsifier, metal's chelating, edible biofilm and fat reducer. The variation in the deacetylation degree of this polymer gives differentiated functional properties. It is mainly obtained from crustaceans, but fish scales are also a potential source of this product, despite neglected so far. The aim of this study was to develop a method for chitin extraction and deacetylation for chitosan obtaining from Nile tilapia (Oreochromis niloticus) scales. Characterization showed that chitosan was completely purified. The chitin infrared spectrum presented a characteristic larger band in the region of 3,500 cm -1 , due to axial stretching vibrations of the OH group been completely purified, which disappeared in the chitin spectrum. However, a new band aroused at 1,640 cm -1 due to the NH2 deformation, which predominated over the band at 1,655 cm -1 , associated to the carbonyl (C=O) that tends to decrease, as the degree of deacetylation of chitosan increases. All bands observed were similar to those described in the literature. Although the yields were lower than the averages usually reported for crustaceans, they can be improved to obtain higher yields and deacetylation. Keywords: fish residue, chitin, chitosan, infrared, deacetylation, chemical processes.Proceso alcalino para la extracción de quitina y producción de quitosano a partir de escamas de tilapia del Nilo (Oreochromis niloticus)RESUMEN. El quitosano es un biopolímero de amplia aplicación debido a sus características y no toxicidad, presentando actividad antimicrobiana, antitumoral y cicatrizante. Actualmente se utiliza como emulsionante, quelante de metales, biopelícula comestible y reductor de grasas. La variación en el grado de desacetilación de este polímero ofrece diferentes propiedades funcionales. Se obtiene principalmente de crustáceos, pero las escamas de pescado también son una fuente potencial de este producto, proceso descuidado hasta ahora. El objetivo de este estudio fue desarrollar un método para la extracción de quitina y desacetilación de quitosano a partir de escamas de tilapia del Nilo (Oreochromis niloticus). Esta caracterización mostró que el quitosano fue completamente purificado. El espectro infrarrojo de la quitina presentó una ancha banda característica en la región de 3,500 cm -1, debido a vibraciones del estiramiento axial del grupo OH que ha sido completamente purificado, que desapareció en el espectro de la quitina. Sin embargo, se observó una nueva banda a 1,640 cm -1 causada por la deformación de NH2 que predominó sobre la banda de 1,655 cm -1 , asociada al carbonilo (C=O) que tiende a disminuir y al aumento del grado de desacetilación del quitosano. Todas las bandas observadas fueron similares a las descritas en la literatura. Aunque los rendimientos fueron menores que los promedios reportados generalmente para crustáceos, ellos se pueden mejo...

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“…Chitosan is a natural copolymer consisting of units of β (1 → 4)-2-amino-2-deoxy-d-glycopyranose and β (11 → 4)-2-acetamide-␤(1-4)-2-deoxy-d-glycopyranose. The amine groups present in its polymeric chain can be protonated, increasing their positive charge densities and their ionic interaction with a number of anionic chelating agents [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Spray-dried chitosan microspheres containing 8-hydroxyquinoline -5 sulphonic acid as a new adsorbent for Cd(II) and Zn(II) ions

Vitali

Laranjeira

Gonçalves

et al. 2008

International Journal of Biological Macromolecules

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The interaction between reactive dye containing vinylsulfone group and chitosan microspheres

Cited by 21 publications

References 0 publications

Cross-linked quaternary chitosan as an adsorbent for the removal of the reactive dye from aqueous solutions

Cross-linked quaternary chitosan as an adsorbent for the removal of the reactive dye from aqueous solutions

Alkali process for chitin extraction and chitosan production from Nile tilapia (Oreochromis niloticus) scales

Spray-dried chitosan microspheres containing 8-hydroxyquinoline -5 sulphonic acid as a new adsorbent for Cd(II) and Zn(II) ions

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