Influence of degree of deacetylation on critical concentration of chitosan/dichloroacetic acid liquid‐crystalline solution

Dong, Yanming; Xu, Congyi; Wang, Jianwei; Wu, Yusong; Wang, Mian; Ruan, Yi

doi:10.1002/app.2286

Cited by 43 publications

(24 citation statements)

References 12 publications

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“…The amide I bands at 1655 cm −1 (sometimes together with the amide I band at 1630 cm −1 ) or the amide II band at 1560 cm −1 are used as the characteristic band(s) of N -acetylation. Among the postulated internal reference bands are the OH stretching band at 3450 cm −1 [125,133], the C-H stretching band at 2870–2880 cm −1 [134], the –CH 2 bending centred at 1420 cm −1 [129], the amide III band at 1315–1320 cm −1 [135], the anti-symmetric stretching of the C-O-C bridge at around 1160 cm −1 [136], the skeletal vibrations involving the C-O-C stretching bands at 1070 or 1030 cm −1 [127,128] and the band at 897 cm −1 (C-O-C bridge as well as glycosidic linkage) [137]. The different baselines suggested in the literature [129] are presented in Figure 8.…”

Section: Application Of Spectroscopic Methods For Analyzing the Stmentioning

confidence: 99%

Application of Spectroscopic Methods for Structural Analysis of Chitin and Chitosan

et al. 2010

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Chitin, the second most important natural polymer in the world, and its N-deacetylated derivative chitosan, have been identified as versatile biopolymers for a broad range of applications in medicine, agriculture and the food industry. Two of the main reasons for this are firstly the unique chemical, physicochemical and biological properties of chitin and chitosan, and secondly the unlimited supply of raw materials for their production. These polymers exhibit widely differing physicochemical properties depending on the chitin source and the conditions of chitosan production. The presence of reactive functional groups as well as the polysaccharide nature of these biopolymers enables them to undergo diverse chemical modifications. A complete chemical and physicochemical characterization of chitin, chitosan and their derivatives is not possible without using spectroscopic techniques. This review focuses on the application of spectroscopic methods for the structural analysis of these compounds.

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Section: Application Of Spectroscopic Methods For Analyzing the Stmentioning

confidence: 99%

Application of Spectroscopic Methods for Structural Analysis of Chitin and Chitosan

et al. 2010

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“…according to the method of literature. 32,33 These chitosan films were used to perform DSC measurements both without physical aging and after aging. From Figure 10, no obvious change of T g can be noted.…”

Section: Influence Of Degree Of Deacetylationmentioning

confidence: 99%

Studies on glass transition temperature of chitosan with four techniques

Dong

Ruan

Wang

et al. 2004

J of Applied Polymer Sci

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252

112

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Studies on the glass transition temperature (T g ) of chitosan are difficult to pursue because of the difficulty in sample preparation and the hydroscopicity of samples. There are a few works concerning this principal relaxation of chitosan. Among them, several quite different values (150°C, 161°C, and 203°C) have been reported. In this paper, the T g of chitosan (140 ϳ 150°C) was determined by means of four techniques, namely, dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC), thermally simulated current spectroscopy (TSC), and dilatometry (DIL).DSC measurement has been assumed not to be sensitive enough to detect the relaxation temperature of polysaccharides. We propose a new method to improve the sensitivity of the DSC measurement. After a physical aging treatment of samples, the transition in DSC traces became much more distinct because of the enthalpy relaxation. This technique was also used to distinguish the T g from other relaxations.The T g of chitosan with different degree of deacetylation (D.D.) was examined by DSC. No influence of D.D. on T g was found.

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“…In chitin, the degree of acetylation is typically 0.90, indicating the presence of certain amine groups (as a certain amount of deacetylatikon can occur during extraction, chitin may also contain about 5-15% of amine groups) [5,10]. Thus, the degree of N-acetylation, i.e.…”

Section: Introductionmentioning

confidence: 99%

Extraction and characterization of chitin and chitosan from Termitomyces titanicus

Kasongo

Tubadi²,

Bampole

et al. 2020

SN Appl. Sci.

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This research focuses on the extraction and characterisation of chitin and chitosan from fungal biomass, Termitomyces titanicus, by immersing it in a solution of sodium hydroxide, followed by deacetylation in a basic medium using the full two-level factorial design (2 2) to obtain chitosan as a residual. The obtained chitosan was characterised by basic conductimetric titration and viscometry to determine the degree of deacetylation and the average molecular weight, respectively. The extraction of chitin was carried out under the following operating conditions: particle size less than 2.5 mm; hydrolysis time of 120 min; concentration 3 M of the NaOH solution; and temperature of 100 °C. The extraction yield of chitin was 38.04%, and the degree of deacetylation of chitosan was 69.50%, an intrinsic viscosity of 0.6822 dL/g, and a viscosimetric average molecular weight of 985.88 kDa. This research therefore shows that fungus specie called T. titanicus can serve as an alternative chitin and chitosan source. In addition, the mathematical model established for deacetylation degree that, based upon the extra process time, it would be possible to increase the purity of chitosan.

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Influence of degree of deacetylation on critical concentration of chitosan/dichloroacetic acid liquid‐crystalline solution

Cited by 43 publications

References 12 publications

Application of Spectroscopic Methods for Structural Analysis of Chitin and Chitosan

Application of Spectroscopic Methods for Structural Analysis of Chitin and Chitosan

Studies on glass transition temperature of chitosan with four techniques

Extraction and characterization of chitin and chitosan from Termitomyces titanicus

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