Surface deacetylation of chitin nano-whiskers

Chen, Siyu; Chen, Dajun

doi:10.1007/s00289-019-03018-0

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…Particularly, the surface deacetylation of chitin prevented the intermolecular H-bonding and broke the regularity of lateral packing between chains given the enhanced interaction of chitin with water, 316 while the crystallinity of ChNC remained largely unaltered. 317,318 Such process induced homogeneous surface etching of chitin, leading to isolation of individualized, straight rodlike nanocrystals (Figure 17b), which is in contrast to those obtained from direct acid hydrolysis, as shown in Figure 16a−c. Moreover, the effect of charged surfaces on the disassembly of chitin clusters was further emphasized by the coexistence of well-fibrillated, individual ChNC with loosely bound chitin nanofibrils by limited ultrasonication after dialysis (Figure 17c).…”

Section: Isolation Of Nanochitinmentioning

confidence: 99%

Nanochitin: Chemistry, Structure, Assembly, and Applications

et al. 2022

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Section: Isolation Of Nanochitinmentioning

confidence: 99%

Nanochitin: Chemistry, Structure, Assembly, and Applications

et al. 2022

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“…The diffraction peaks of CaCO 3 (2θ = 29.2, 35.9, and 39.3°) were clearly visible in the XRD pattern of crayfish shell, which was consistent with previous studies. 52,54 In addition, commercial chitin and extracted chitin had crystal reflection at 2θ = 9.3, 12.7, 19.1, 21, 23.3, and 26.3°, which showed the typical crystal structure of α-chitin. 51 The XRD spectra of commercial chitin and extracted chitin were almost similar, indicating the high purity of extracted chitin.…”

Section: Characterization Of Extracted Chitinmentioning

confidence: 97%

Dissolving and Efficient Fractionation of Chitin and Synchronous Preparation of Calcium Lactate from Crayfish Shell Waste Using Amino Acid-Based Deep Eutectic Solvents

Zhang,

Wang,

Zhan

et al. 2024

ACS Sustainable Chem. Eng.

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Chitin is a natural biomass material with wide sources and high application potential, but the solvents for dissolving chitin are very limited. In this work, ternary alkaline deep eutectic solvents (DESs) containing amino acids, urea, and 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU) were prepared, which can successfully achieve the dissolution of chitin and can be recycled. By adjusting the type of amino acids and the amount of DBU, the maximum solubility of chitin can reach 6.0 wt %. In addition, unlike the reported acidic DES system, this new ternary alkaline DES not only efficiently extracted chitin from crayfish shell waste but also efficiently prepared calcium lactate (CL), which successfully realized the effective recycling of calcium resources. Through 11 sets of extraction conditions, proteins in the crayfish shell were effectively removed, and the yields of chitin and CL remained above 85 and 90%, respectively. Finally, chitin nanofibers were successfully prepared by ultrasonic treatment with extracted regenerated chitin. Further processing of the chitin nanofibers can yield chitin films with high transparency and high tensile strength (63.2 MPa). It provides a novel DES system to dissolve chitin and an environmentally friendly utilization strategy to efficiently extract chitin and prepare CL from crayfish shell waste, thereby producing high-performance functional materials.

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“…The crystallinity index of polymers and nanopolymers was measured using an X-Ray Diffraction device (X-Pert pro) in the Department of Physics at the College of Science, University of Basra, and the Cu Kα radiation source was used in this device with a voltage of 40 kV and an angle of 2θ from 10 -40 degrees (9). The degree of crystallinity of natural chitin and chitosan and chitin nanoparticles and chitosan nanoparticles was calculated according to the equation (3) mentioned by ( 22…”

Section: X-ray Diffractionmentioning

confidence: 99%

Synthesis Chitosan nanoparticles from Animal Byproducts (Shrimp Shells) Characterization, Physical Properties and Toxicity of Polymeric Nanoparticles in vivo

Kadhim H. Abdul Sayed,

Al-Hasimi,

Ziadan

2024

Kufa Jour. Agri. Sci.

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The study included the extraction of Chitin (Ch) from shrimp shells and preparation of Chitin nanoparticles (NCh) using acid hydrolysis and ultrasound method. In addition, the preparation of chitosan (Chs) and Chitosan nanoparticles (NChs) by Deacetylation method, then we study some of the characteristics, including yield, diameter by Size Analyzer, Field Emission Scanning Electron Microscopy (FESEM), Fourier transform infrared (FTIR) spectroscopy, X-Ray Diffractometer (X-RD), Viscosity, Water Binding Capacity (WBC) and Fat Binding Capacity (FBC). The results showed, (a) decreased the percentage of yield of NChs to 8.20%, (b) the effective diameter of the natural chitosan using a Size Analyzer and was 28121.5 nm, (c) FESEM analysis revealed that the NChs displayed a nanoscale structure with diameters ranged from 20.93 - 30.20 nm (d) the degree of deacetylation (DD%) using FT-IR spectroscopy device, of NChs was (80.21%) compared to Chs 71.45%, and in addition, from the X-ray spectrum, two peaks in spectra of (Ch, NCh) and (Chs, NChs) were observed at the diffraction angles (2θ) which are (10.70-10.99) and (19.99-20.37). Results show increasing the crystallization coefficient of NCh and NChs, while viscosity, WBC and FBC of NChs decreased compared to Chs. The NChs did not show any toxic effect on human blood cells at concentrations of 100-1000 µg. ml-1.

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Surface deacetylation of chitin nano-whiskers

Cited by 6 publications

References 23 publications

Nanochitin: Chemistry, Structure, Assembly, and Applications

Nanochitin: Chemistry, Structure, Assembly, and Applications

Dissolving and Efficient Fractionation of Chitin and Synchronous Preparation of Calcium Lactate from Crayfish Shell Waste Using Amino Acid-Based Deep Eutectic Solvents

Synthesis Chitosan nanoparticles from Animal Byproducts (Shrimp Shells) Characterization, Physical Properties and Toxicity of Polymeric Nanoparticles in vivo

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