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関連する概念動画

Hydrolysis01:15

Hydrolysis

Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Role of Microtubules in Cell Wall Deposition01:02

Role of Microtubules in Cell Wall Deposition

Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of disassembly and...
Cellulose and Pectic Polysaccharides01:15

Cellulose and Pectic Polysaccharides

Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...

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Highly Stable, Functional Hairy Nanoparticles and Biopolymers from Wood Fibers: Towards Sustainable Nanotechnology
11:32

Highly Stable, Functional Hairy Nanoparticles and Biopolymers from Wood Fibers: Towards Sustainable Nanotechnology

Published on: July 20, 2016

結晶性セルロースの水素結合ネットワークを再構成すると,その脱ポリメリゼーション率が向上します.

Shishir P S Chundawat1, Giovanni Bellesia, Nirmal Uppugundla

  • 1Biomass Conversion Research Laboratory, Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, USA. chundawa@msu.edu

Journal of the American Chemical Society
|June 14, 2011
PubMed
まとめ
この要約は機械生成です。

アンモニアの前処理を使用してセルロースの結晶性を変化させると,酵素によるバイオ燃料の変換が著しく改善されます. この前処理は,水素結合ネットワークを修正し,糖化率を高め,酵素結合を減少させ,費用対効果の高いバイオ燃料のための新しい経路を提供します.

さらに関連する動画

Green and Low-cost Production of Thermally Stable and Carboxylated Cellulose Nanocrystals and Nanofibrils Using Highly Recyclable Dicarboxylic Acids
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Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation
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Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

Published on: June 17, 2014

関連する実験動画

Last Updated: Jun 1, 2026

Highly Stable, Functional Hairy Nanoparticles and Biopolymers from Wood Fibers: Towards Sustainable Nanotechnology
11:32

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Green and Low-cost Production of Thermally Stable and Carboxylated Cellulose Nanocrystals and Nanofibrils Using Highly Recyclable Dicarboxylic Acids
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Green and Low-cost Production of Thermally Stable and Carboxylated Cellulose Nanocrystals and Nanofibrils Using Highly Recyclable Dicarboxylic Acids

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Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation
11:26

Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

Published on: June 17, 2014

科学分野:

  • バイオケミストリー バイオケミストリー
  • バイオテクノロジー バイオテクノロジー
  • マテリアルサイエンス 材料科学

背景:

  • セルロースの結晶性は,リンゴセルロースをバイオ燃料に変換する重要なステップである効率的な酵素サカリフィケーションを妨げます.
  • 分子レベルでセルロースのリカルシタンスを理解することは,バイオ燃料の生産を改善するために不可欠です.

研究 の 目的:

  • セルロース繊維の水素結合ネットワークの変化がセルラーゼ活性にどのように影響するか調査する.
  • セルロースの構造的改変を通じた強化された酵素サカリフィケーションの分子規模の説明を提供すること.

主な方法:

  • セルロース構造と水素結合の変化を分析するための分子動力学 (MD) シミュレーション.
  • 酵素測定法でサッカリフィケーション率とセルラーゼ結合能力を測定する.
  • セルロースアロモルフI (β) からIII (I) に変換するためのアンモニアの予備処理.

主要な成果:

  • アンモニア処理によりセルロースI (β) がIII (i) に変換され,水素結合網が変化した.
  • セルロースIII (I) は,水と溶媒に曝露したグルカン鎖の水素結合を約50%増加させた.
  • サカリフィケーション率は5倍まで増加し,セルラーゼ結合能力が低下した無形セルロースに接近した.

結論:

  • セルロースの水素結合ネットワーク,特にセルロースIII (I) に変更することで,酵素分解が強化されます.
  • セルロースIII (III) の"無形状"の表面は,グルカンの抽出と酵素へのアクセスを容易にします.
  • このアプローチは,セルロースの分解と酵素効率の向上により,バイオ燃料生産のための新しい戦略を提供します.