Mechano-chemical Synthesis of Compound Powders in ZnO-TiO2 System by a New High Intensive Ball Mill

Satoh, Tomoaki; Tanno, Koichi; Asada, K.; Takeda, Mitsuhiro

doi:10.2497/jjspm.53.62

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…This chitin was named C0. Converge milling was conducted by milling 20 g α-chitin samples at 800 rpm with zirconia balls (10 mm in diameter) using a converge mill (Makabe giken Co. Ltd.; , ) . The volume of balls used in the experiment represented 10% of the sample volume.…”

Section: Materials and Methodsmentioning

confidence: 99%

Conversion of α-Chitin Substrates with Varying Particle Size and Crystallinity Reveals Substrate Preferences of the Chitinases and Lytic Polysaccharide Monooxygenase of Serratia marcescens

Nakagawa

Eijsink

Totani

et al. 2013

J. Agric. Food Chem.

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1Industrial depolymerization of chitinous biomass generally requires numerous steps and the 2 use of deleterious substances. Enzymatic methods provide an alternative, but fundamental 3 knowledge that could direct potential development of industrial enzyme cocktails is scarce. 4We have studied the contribution of mono-component chitinases (ChiA, -B, and -C) and the 5 lytic polysaccharide monooxygenase (LPMO) from Serratia marcescens on depolymerization 6 of -chitin substrates with varying particle size and crystallinity that were generated using a 7 converge mill. For all chitinases activity was positively correlated to a decline in particle size 8 and crystallinity. Especially ChiC, the only non-processive endo-chitinase from the S. 9 marcescens chitinolytic machinery, benefited from mechanical pretreatment. Combining the 10 chitinases revealed clear synergies for all substrates tested. CBP21, the chitin-active LPMO 11 from S. marcescens, increased solubilization of substrates with high degrees of crystallinity 12 when combined with each of the three chitinases, but this synergy was reduced upon decline 13 in crystallinity. 14 15 16 KEYWORDS 17 -chitin, mechanical pretreatment, chitinase, GH18, lytic polysaccharide monooxygenases, 18

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Section: Materials and Methodsmentioning

confidence: 99%

Conversion of α-Chitin Substrates with Varying Particle Size and Crystallinity Reveals Substrate Preferences of the Chitinases and Lytic Polysaccharide Monooxygenase of Serratia marcescens

Nakagawa

Eijsink

Totani

et al. 2013

J. Agric. Food Chem.

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“…The direct degradation ratio of the chitin in crab shell was close to 100%. For this purpose, they developed a novel “converge” mill [ 124 ], a derivative of the medium ball mill. Mechanochemical grinding, with the converge mill, was found to be extremely effective for pretreating chitin and crab shell before enzymatic digestion [ 125 ].…”

Section: Perspectivesmentioning

confidence: 99%

Bioproduction of Chitooligosaccharides: Present and Perspectives

2014

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Chitin and chitosan oligosaccharides (COS) have been traditionally obtained by chemical digestion with strong acids. In light of the difficulties associated with these traditional production processes, environmentally compatible and reproducible production alternatives are desirable. Unlike chemical digestion, biodegradation of chitin and chitosan by enzymes or microorganisms does not require the use of toxic chemicals or excessive amounts of wastewater. Enzyme preparations with chitinase, chitosanase, and lysozymeare primarily used to hydrolyze chitin and chitosan. Commercial preparations of cellulase, protease, lipase, and pepsin provide another opportunity for oligosaccharide production. In addition to their hydrolytic activities, the transglycosylation activity of chitinolytic enzymes might be exploited for the synthesis of desired chitin oligomers and their derivatives. Chitin deacetylase is also potentially useful for the preparation of oligosaccharides. Recently, direct production of oligosaccharides from chitin and crab shells by a combination of mechanochemical grinding and enzymatic hydrolysis has been reported. Together with these, other emerging technologies such as direct degradation of chitin from crustacean shells and microbial cell walls, enzymatic synthesis of COS from small building blocks, and protein engineering technology for chitin-related enzymes have been discussed as the most significant challenge for industrial application.

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Development of innovative technologies to decrease the environmental burdens associated with using chitin as a biomass resource: Mechanochemical grinding and enzymatic degradation

Nakagawa

Oyama

Kon

et al. 2011

Carbohydrate Polymers

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Mechano-chemical Synthesis of Compound Powders in ZnO-TiO2 System by a New High Intensive Ball Mill

Cited by 5 publications

References 14 publications

Conversion of α-Chitin Substrates with Varying Particle Size and Crystallinity Reveals Substrate Preferences of the Chitinases and Lytic Polysaccharide Monooxygenase of Serratia marcescens

Conversion of α-Chitin Substrates with Varying Particle Size and Crystallinity Reveals Substrate Preferences of the Chitinases and Lytic Polysaccharide Monooxygenase of Serratia marcescens

Bioproduction of Chitooligosaccharides: Present and Perspectives

Development of innovative technologies to decrease the environmental burdens associated with using chitin as a biomass resource: Mechanochemical grinding and enzymatic degradation

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