Solubility and property of chitin in NaOH/urea aqueous solution

Hu, Xianwen; Du, Yumin; Tang, Yufeng; Wang, Qun; Feng, Tao; Yang, Jianhong; Kennedy, John F.

doi:10.1016/j.carbpol.2007.05.002

Cited by 219 publications

(99 citation statements)

References 21 publications

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“…In A and B is one of the most obvious changes in the original chitin amide I band at 1661cm-1and 1629cm-1 appeared two peaks, and treated with NaOH/Urea freeze-thaw chitin only appeared at the 1657cm-1 A peak, it shows that after the pretreatment of chitin are by alpha into beta, also demonstrated the processed product molecular inter-atomic forces reduced [1]. In 1661cm-1,1316cm-1 and 1156cm-1 of the peak represent the chitin amide I,II,III band, broad peak around 3445cm-1is hydroxyl stretching vibration absorption peak, peak wide that exists between the hydroxyl strong intermolecular and intramolecular hydrogen bonding [2,3].…”

Section: Ft-irmentioning

confidence: 79%

6-carboxyl Preparation and Characterization of Chitin

Fang¹,

Xu²,

Huang³

et al. 2015

Proceedings of the International Conference on Advances in Energy, Environment and Chemical Engineering

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Section: Ft-irmentioning

confidence: 79%

6-carboxyl Preparation and Characterization of Chitin

Fang¹,

Xu²,

Huang³

et al. 2015

Proceedings of the International Conference on Advances in Energy, Environment and Chemical Engineering

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“…7). In our previous study (Peng et al 2011b), we also found that the native xylan-rich hemicelluloses and carboxymethyl xylanrich hemicelluloses (in alkaline solution) also exhibited shear-thinning behavior, which were commonly observed in other carbohydrate polymers (Torul and Arslan 2003;Hu et al 2007). At the same concentration, MAXH with a DS of 0.94 displayed a higher viscosity than that one with a DS of 0.41 (Fig.…”

Section: Molecular Weights and Molecular Weight Distributionmentioning

confidence: 85%

Glycidyl methacrylate derivatized xylan-rich hemicelluloses: synthesis and characterizations

et al. 2012

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In this paper, a novel type of hemicellulosic derivative containing polymerizable double bonds (C=C) was synthesized by chemical reaction of xylan-rich hemicelluloses and glycidyl methacrylate (GMA) in dimethyl sulfoxide (DMSO) in presence of catalysts. The chemical structure, reaction mechanism, and rheological properties of the derivative were investigated by means of FT-IR, 1 H and 13 C-NMR, DEPT 135 NMR, GC-MS and rheometer. The influence of the reaction conditions including reaction time, temperature, catalysts, and the amount of reagents on the degree of substitution were investigated in detail. Results showed that the chemical reaction of xylan-rich hemicelluloses with GMA was transesterification, which resulted in direct attachment of methacrylate (MA) groups to xylan-rich hemicelluloses, instead of GMA. A maximum degree of substitution of 0.94 could be achieved under the optimum reaction condition (40°C, 1.8 equiv of GMA to per xylose unit, 36 h, 20 % DMAP). Results from rheological analysis indicated that the aqueous solutions of the methacrylated xylan-rich hemicelluloses (MAXH; 0.5, 1.0 and 2.0 wt%) exhibited typical shear-thinning behavior in the range of shear rates tested. The viscoelasticity of MAXH solutions increased with the increasing concentration and DS.

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“…Dibuat larutan kitin 2%dalam pelarut NaOH 8%/Urea 4% (w/w)sebanyak 200 g. Campuran tesebut kemudian diaduk dalam total waktu 36 jam pada suhu (-20 o C) (diaduk selama 7-9 jam/hari kemudian didinginkan pada suhu (-20 o C) (Hu et al, 2007).Hidrogel dibuat perbandingan sesuai tabel 2. Selanjutnya ditambahkan aquades pada masing-masing perbandingan hingga mencapai 40 g dan dioven pada suhu 60 o C (Tanodekaew et al, 2003).…”

Section: Sintesis Hidrogelunclassified

“…Namun, terdapat beberapa penelitian mengenai pelarutan kitin. Zhou et al, (2000) dan Hu et al, (2007) berhasil melarutkan kitin dalam pelarut campuran NaOH/Urea (8%/4%). (Lestari dkk) Hidrogel akrilamida banyak digunakan dalam bidang kesehatan dan agrikultur sebagai control erosi pada tanah, sebagai media bioaktif dalam pengolahan tanah serta sumber nitrogen dan karbon untuk tanaman (Xiao, 2001) (Erizal, 2011).…”

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Synthesis and Characterization of Hydrogels based on Graft Copolymerization of Acrylamide on Chitin resulted from Enzymatic Isolation of Shrimp Waste

2017

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Shrimp waste containing chitin 15-20%. Chitin can be isolated enzymatically by using protease enzymes derived from the waste itself. Waste of shrimp marinated in 1M H2SO4 for 10 days at pH 1-2 and do control the pH and concentration of N-total every 24 hours. So that, this process can reduce the use of chemicals and environmental pollution. Enzymatic chitin obtained ash content 1.789% and 5.322% of N-total. Results of IR showed characteristic functional groups of chitin are OH 3390.5 cm

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Solubility and property of chitin in NaOH/urea aqueous solution

Cited by 219 publications

References 21 publications

6-carboxyl Preparation and Characterization of Chitin

6-carboxyl Preparation and Characterization of Chitin

Glycidyl methacrylate derivatized xylan-rich hemicelluloses: synthesis and characterizations

Synthesis and Characterization of Hydrogels based on Graft Copolymerization of Acrylamide on Chitin resulted from Enzymatic Isolation of Shrimp Waste

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