Effects and kinetics of a novel temperature cycling treatment on the N-deacetylation of chitin in alkaline solution

Liu, T.G.; Li, B.; Huang, Wen‐Can; Lv, Bo; Chen, J.; Zhang, J.X.; Zhu, Lulu

doi:10.1016/j.carbpol.2008.12.006

Cited by 47 publications

(26 citation statements)

References 24 publications

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“…X-ray diffraction (XRD) analysis showed that the diffraction peaks at 19°-20° were obviously stretched, indicating the perceptible changes of the crystal structure of materials during SE treatment ( Fig. 2(A)) [28]. Fig.…”

Section: Structural Changes and Morphological Properties Of Mycelium mentioning

confidence: 99%

Comprehensive utilization of Aspergillus niger mycelium waste from citric acid fermentation on the basis of steam explosion and ionic liquid pretreatment

Ma¹,

Gao²,

Bi³

et al. 2019

Preprint

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Background Aspergillus niger mycelium waste, a by-product from citric acid fermentation is considered a good raw material to produce fungal chitosan and glucosamine (GlcN). However, its successful application has always been a challenge.Results In this work, the effects of combined pretreatment involving steam explosion and ionic liquid (IL) on mycelium waste were investigated. Results show that pretreatment of mycelium waste at 2.5 MPa for 1 min improved the GlcN hydrochloride yield by 65.49%, the release of soluble sugar reached 0.46 g/g of sample, and the deacelation degree of fungal chitosan by hydrolysis of chitin deacetylase from Rhodococcus equi CGMCC14861 (ReCDA) was from scratch and a 1.3-fold increase by combined with IL pretreatment. In addition, a recycling strategy for by-products, which promoted the fermentation of ReCDA used for fungal chitosan, was efficiently developed.Conclusion This is the first report of comprehensive utilization of Aspergillus niger mycelium waste from citric acid fermentation on the basis of steam explosion and ionic liquid pretreatment. This study demonstrates a green-like technology for the comprehensive utilization of A. niger mycelium waste from citric acid fermentation.

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Section: Structural Changes and Morphological Properties Of Mycelium mentioning

confidence: 99%

Comprehensive utilization of Aspergillus niger mycelium waste from citric acid fermentation on the basis of steam explosion and ionic liquid pretreatment

Ma¹,

Gao²,

Bi³

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…Undeniably, it is beneficial to get the same effect with less amount of food additives or a food additive playing a dual role of two food additives, such as acetic acid, which is used as both flavoring agent and as preservative in food system. Chitosan (CS) [poly ˇ-(1 → 4)-linked 2-amido-2-deoxy-Dglucopyranose and ˇ-(1 → 4)-linked 2-acetamido-2-deoxy-D-glucopyranose] is a unique cationic marine polysaccharide obtained by partial deacetylation of chitin, the second most abundant nature polymer, under alkaline condition [3][4][5]. Due to its non-toxicity, biodegradability [6], biocompatibility [7,8], antimicrobial activity [9], and versatile chemical and physical properties, chitosan attracts considerable interest and has prospective applications in a variety of fields, such as medical applications, biotechnology, textiles, wastewater treatment, cosmetics, agriculture, and food science [10][11][12].…”

Section: Q2mentioning

confidence: 99%

Preparation and characterization of N-benzoyl-O-acetyl-chitosan

Cai

Dang

Liu

et al. 2015

International Journal of Biological Macromolecules

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“…The kinetics of homogeneous alkaline deacetylation of -chitin was reported to be a pseudo-first-order reaction at high temperature (80 to 120 ∘ C) [30] and also at low temperature (−5 to −35 ∘ C) [31]. Deacetylation of chitin was achieved in accordance with a modified procedure developed by Canella and Garcia [32].…”

Section: Alkaline Deacetylation Of Chitinmentioning

confidence: 99%

Physicochemical Characterization of Thermally Treated Chitosans and Chitosans Obtained by Alkaline Deacetylation

Oliveira

Franco

Oliveira

2014

International Journal of Polymer Science

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The thermal depolymerization of chitosan and alkaline deacetylation of chitin were characterized by measurement of viscosity, gel permeation chromatography (GPC), potentiometric titration (PT), and proton nuclear magnetic resonance spectroscopy (H1NMR). The depolymerization rates (DR) measured by kinematic viscosity (KV), apparent viscosity (AV), and GPC (Mw) until 4 h of treatment wereDRKV=21.9,DRAV=25.5, andDRMw=23.3% h-1and for 5 to 10 h of treatment they decreased slowly to produce ofDRKV=0.545,DRAV=0.248, andDRMw=1.11% h-1. The mole fraction of N-acetylglucosamine residuesFAof chitosans was not modified after 10 h of thermal treatment at 100°C. The initialFAvalues of chitosan without any treatment wereFAPT=0.21andFAHNMR1=0.22and of chitosan treated for 10 h wereFAPT=0.27andFAHNMR1=0.22. The variables used to characterize the depolymerization process showed a good correlation. Six hours of thermal treatment as sufficient to obtain chitosans with a molar mass 90% smaller than that of the control chitosan without treatment.

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Effects and kinetics of a novel temperature cycling treatment on the N-deacetylation of chitin in alkaline solution

Cited by 47 publications

References 24 publications

Comprehensive utilization of Aspergillus niger mycelium waste from citric acid fermentation on the basis of steam explosion and ionic liquid pretreatment

Comprehensive utilization of Aspergillus niger mycelium waste from citric acid fermentation on the basis of steam explosion and ionic liquid pretreatment

Preparation and characterization of N-benzoyl-O-acetyl-chitosan

Physicochemical Characterization of Thermally Treated Chitosans and Chitosans Obtained by Alkaline Deacetylation

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