Synthesis and Characterization of Low Molecular Weight Chitosan

Yuan, Yin; Jiang, Wei; Xing, Liyan; Pu, Junwen

doi:10.15376/biores.10.2.2338-2349

Cited by 19 publications

(19 citation statements)

References 20 publications

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“….It has been also reported that sodium hypochlorite (NaClO) can be used to produce chitosan with lower molecular weights or oligochitosan 18 .Among the reagents aforementioned, hydrogen peroxide is more widely used because it is easy to handle, easy to obtain, and more environmentally friendly 4, 13 . In order to effectively and efficiently get oligochitosan, some researchers have combined hydrogen peroxide using microwave irradiation 19,20 , gamma ray radiation 21 , ultraviolet light 22 , ultraviolet-irradiated oxygen 23 , heteropoly acid 24,25 , and ultrasonic 26 .…”

Section: -17mentioning

confidence: 99%

Preparation of Chitosan with Various Molecular Weight and Its Effect on Depolymerization of Chitosan with Hydrogen Peroxide using Conventional Technique

Tanasale¹,

Bijang²,

Rumpakwara³

2019

IJCTR

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Depolymerization of chitosan with hydrogen peroxide (H 2 O 2 ) using conventional techniques has been carried out by varying the molecular weight of chitosan. This study was aimed to determine the optimum conditions of chitosan depolymerization and the effect of molecular weight on the preparation of oligochitosan. Chitosan was produced with different molecular weights in 5% acetic acid with variations of heating time for 2, 12, 24 and 24 h. The molecular weight of chitosan was determined by the viscometry method. Chitosan produced from commercial chitin hadthe molecular weight of 13.30x10 4 (CC-2), 12.02x10 4 (CC-12), 7.75x10 4 (CC-24) and 4.35x10 4 g / mol (CC-120) for 2, 12, 24, and 120 h of heating time, respectively. The results indicated that the properties of produced chitosan are affected by heating time. The longer the heating time, the lower the molecular weight of chitosan would be. Furthermore, chitosan was depolymerized by varying the concentration of H 2 O 2 , temperature, and depolymerization time using conventional techniques. The depolymerization process of chitosan with H 2 O 2 was influenced by H 2 O 2 concentration and heating temperature where the optimum conditions of depolymerization of chitosan using H 2 O 2 were obtained for CC-12 when the process was conducted using H 2 O 2 concentration of 4%; at 30°C, for 4 h to give the corresponding oligochitosan with the molecular weight of 4.2x10 3 in 97.57% yield.

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Section: -17mentioning

confidence: 99%

Preparation of Chitosan with Various Molecular Weight and Its Effect on Depolymerization of Chitosan with Hydrogen Peroxide using Conventional Technique

Tanasale¹,

Bijang²,

Rumpakwara³

2019

IJCTR

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“…Se ha informado que la masa molar de estos derivados depende de las condiciones de reacción. En tal sentido, ZHENG et al [13] evaluaron el efecto de cuatro variables independientes (relación de quitosano/solución, temperatura, tiempo y cantidad de agente oxidante) sobre la masa molar del derivado sintetizado. Estos autores optimizaron las condiciones operacionales de manera tal de obtener un oligómero de aproximadamente 11000 Da.…”

Section: Figuraunclassified

“…Si bien el valor de la temperatura de degradación máxima de los OQ concuerda con el reportado por ZIEGLER-BOROWSKA et al [22] para quitosano, la temperatura de inicio se desplazó hacia valores significativamente menores. Este resultado puede atribuirse a que el método de degradación oxidativa empleado para la obtención de los OQ alteró la estructura del quitosano, minimizando interacciones intra-e intermoleculares y disminuyendo el peso molecular del polisacárido [13]. El último evento de pérdida de peso corresponde a la destrucción térmica del anillo de piranosa y a la descomposición del residuo carbonoso [20,23].…”

Section: Figuraunclassified

Película biodegradable de almidón de maíz termoplástico y quitosano con actividad antimicrobiana empleada como envase activo

López¹,

Castillo

Farenzena³

et al. 2018

Matéria (Rio J.)

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RESUMEN Una de las líneas para el desarrollo de envases activos contempla la incorporación de agentes antimicrobianos como el quitosano, polisacárido derivado del exoesqueleto de crustáceos. No obstante, su elevada masa molar restringe su difusión desde el envase hacia el alimento por lo que el empleo de oligómeros de características diferenciales es una alternativa interesante, aún poco investigada. El objetivo de este trabajo fue obtener películas activas a base de almidón de maíz termoplástico (TPS) mediante la incorporación de oligoquitosanos (OQ, masa molar = 290 g mol-1 y grado de polimerización = 2). Estos materiales fueron obtenidos mediante termo-compresión en una prensa hidráulica. Se realizaron ensayos de difusión de los OQ desde la matriz de TPS hacia un medio líquido con diferentes grados de acidez (pH = 3, 5 y 7). Las condiciones del medio líquido fueron seleccionadas según la acidez de una amplia variedad de alimentos. A partir de estos ensayos, se demostró la capacidad de difusión de los oligómeros y su dependencia con el pH del medio. La eficiencia de la incorporación de los OQ en el material de envase se comparó con la correspondiente al método convencional de spray del alimento con una solución del agente activo. La capacidad antimicrobiana de las películas y de las soluciones de OQ se evaluó a partir del recuento de hongos y levaduras, empleando frutillas frescas como alimento de estudio. Los resultados derivados de estos ensayos evidenciaron el carácter activo de la película desarrollada, demostrándose además la mayor eficacia del uso de envases activos antimicrobianos, respecto de los métodos convencionales.

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“…Moreover, instead of the unique peak associated to this thermal event in chitosan samples, a broad degradation range is detected in the CO curve. This behavior is based on the fact that oxidative degradation disrupted the chitosan structure by the disintegration of intra-and intermolecular interactions, decreasing the molecular weight of this polysaccharide (Zheng, Yin, Jiang, Xing, & Pu, 2015).…”

Section: Characterization Of Chitosan Oligomersmentioning

confidence: 99%

Active films based on thermoplastic corn starch and chitosan oligomer for food packaging applications

Castillo

Farenzena

Pintos

et al. 2017

Food Packaging and Shelf Life

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Antimicrobial biodegradable films based on thermoplastic corn starch (TPS) and chitosan oligomers (CO) were obtained in order to develop a package prototype for perishable food products. Active films were fabricated thermo-compressing a sandwiched structure constituted by a thin layer of an oligomers enriched solution between two TPS films, previously made by melt-mixing and hot-pressing. Regarding enriched solution, it was obtained by dissolving oligomers in diluted acetic acid. Final material was characterized, determining its physical and optical properties, as well as, studying its microstructure. By diffusion assays it was demonstrated the capability of CO to migrate from the active film towards the aqueous simulant media. Moreover, oligomers were able to diffuse from the matrix, regardless the aqueous medium acidity. Experimental data of diffusion assays were fitted using a mathematical model, estimating diffusion coefficients at three studied pH values (3, 5, and 7). Active film was used to obtain sachets to package perishable foods such as strawberries, ricotta, and flavored breads, which were stored for 7 days under controlled conditions. Antimicrobial capacity of active sachets was corroborated through molds and yeast counts in the stored food products. Additionally, it was demonstrated that CO incorporation to the packaging material resulted in a more efficient way to inhibit microbial development than the spraying technique. This gradual release allows maintaining an effective concentration of

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Synthesis and Characterization of Low Molecular Weight Chitosan

Cited by 19 publications

References 20 publications

Preparation of Chitosan with Various Molecular Weight and Its Effect on Depolymerization of Chitosan with Hydrogen Peroxide using Conventional Technique

Preparation of Chitosan with Various Molecular Weight and Its Effect on Depolymerization of Chitosan with Hydrogen Peroxide using Conventional Technique

Película biodegradable de almidón de maíz termoplástico y quitosano con actividad antimicrobiana empleada como envase activo

Active films based on thermoplastic corn starch and chitosan oligomer for food packaging applications

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