Ultrasound-assisted conversion of alpha-chitin into chitosan

Birolli, Willian Garcia; Delezuk, Jorge Augusto de Moura; Filho, Sérgio Paulo Campana

doi:10.1016/j.apacoust.2015.10.002

Cited by 53 publications

(30 citation statements)

References 21 publications

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“…The use of high temperatures generally improves the reaction rates and yields [25]. Ultrasound and microwave technologies were also proposed to enhance the extraction and deacetylation steps [26][27][28][29][30][31]. Furthermore, biological treatments offer an alternative to such hard chemical reactions: lactic acid bacteria and bacterial protease can be used to remove proteins and deacetylation can also be performed with enzymes [32,33].…”

Section: Introductionmentioning

confidence: 99%

Modification of Chitosan for the Generation of Functional Derivatives

et al. 2019

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Today, chitosan (CS) is probably considered as a biofunctional polysaccharide with the most notable growth and potential for applications in various fields. The progress in chitin chemistry and the need to replace additives and non-natural polymers with functional natural-based polymers have opened many new opportunities for CS and its derivatives. Thanks to the specific reactive groups of CS and easy chemical modifications, a wide range of physico-chemical and biological properties can be obtained from this ubiquitous polysaccharide that is composed of β-(1,4)-2-acetamido-2-deoxy-d-glucose repeating units. This review is presented to share insights into multiple native/modified CSs and chitooligosaccharides (COS) associated with their functional properties. An overview will be given on bioadhesive applications, antimicrobial activities, adsorption, and chelation in the wine industry, as well as developments in medical fields or biodegradability.

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Section: Introductionmentioning

confidence: 99%

Modification of Chitosan for the Generation of Functional Derivatives

et al. 2019

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“…α-chitin is the most stable and abundant form [5]. It possess a compact rhombic structure, due to the antiparallel chain that favors the formation of interlaminar hydrogen bonds [12] between the hydroxyl and carbonyl groups [13]. Conversely, the β-chitin structure is monoclinic with a parallel arrangement that inhibits the formation of interlaminar hydrogen bonds.…”

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confidence: 99%

Chitosan and Xyloglucan-Based Hydrogels: An Overview of Synthetic and Functional Utility

Martínez-Ibarra¹,

López‐Cervantes²,

Sánchez-Machado³

et al. 2018

Chitin-Chitosan - Myriad Functionalities in Science and Technology

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The development of new strategies for wound healing has resulted in the design of biomedical devices using polymers of natural origin. Hydrogels are biomaterials formed by three-dimensional polymeric networks that can retain large amounts of water or biological fluids, and smooth texture similar to living tissue. Chitosan is a linear polysaccharide, (1-4)-2-amino-2deoxy-ß-D-glucan, which has desirable features such as biocompatibility, non-toxicity, hemostasis and antibacterial character. Xyloglucans have different applications in tissue engineering for their physicochemical properties, biocompatibility and control of cell expansion. Hydrogels had been made of homogeneous mixtures prepared of chitosan and purified xyloglucan, followed by a freeze-drying process to develop a flexible and porous structure. Additionally, their mechanical properties such as porosity, solubility, biodegradation, and the antibacterial activity of the hydrogels are studied. The results suggest that the incorporation of xyloglucan favors the characteristics from chitosan-based hydrogels, providing a promising alternative for application in biomaterials with antimicrobial activity.

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“…Some researchers have investigated ultrasonic pretreatment of chitosan which can increase the HMF yield. Other researchers have performed ultrasound-assisted deacetylation to convert both α-chitin and β-chitin to chitosan [37,38]. High-intensity ultrasound irradiation strongly enhances the N-deacetylation reaction, favoring production of completely acid-soluble chitosan at high yield.…”

Section: Physical-assisted Pretreatmentmentioning

confidence: 99%

Production of 5-Hydroxymethylfurfural from Chitin Biomass: A Review

Zhou

Shen

et al. 2020

Molecules

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Chitin biomass, a rich renewable resource, is the second most abundant natural polysaccharide after cellulose. Conversion of chitin biomass to high value-added chemicals can play a significant role in alleviating the global energy crisis and environmental pollution. In this review, the recent achievements in converting chitin biomass to high-value chemicals, such as 5-hydroxymethylfurfural (HMF), under different conditions using chitin, chitosan, glucosamine, and N-acetylglucosamine as raw materials are summarized. Related research on pretreatment technology of chitin biomass is also discussed. New approaches for transformation of chitin biomass to HMF are also proposed. This review promotes the development of industrial technologies for degradation of chitin biomass and preparation of HMF. It also provides insight into a sustainable future in terms of renewable resources.

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Ultrasound-assisted conversion of alpha-chitin into chitosan

Cited by 53 publications

References 21 publications

Modification of Chitosan for the Generation of Functional Derivatives

Modification of Chitosan for the Generation of Functional Derivatives

Chitosan and Xyloglucan-Based Hydrogels: An Overview of Synthetic and Functional Utility

Production of 5-Hydroxymethylfurfural from Chitin Biomass: A Review

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