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Showing papers in "Biomacromolecules in 2007"


Journal ArticleDOI
TL;DR: Never-Dried and once-dried hardwood celluloses were oxidized by a 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated system, and highly crystalline and individualized cellulose nanofibers, dispersed in water, were prepared by mechanical treatment of the oxidized celluloses/water slurries.

2,017 citations


Journal ArticleDOI
TL;DR: Mild enzymatic hydrolysis has been introduced and combined with mechanical shearing and a high-pressure homogenization, leading to a controlled fibrillation down to nanoscale and a network of long and highly entangled cellulose I elements.

1,819 citations


Journal ArticleDOI
TL;DR: This article reviews the state of the art of antimicrobial polymers primarily since the last comprehensive review by one of the authors in 1996 and discusses the requirements of antim antibiotic polymers, factors affecting the antimicrobial activities, methods of synthesizing antimicrobialpolymers, major fields of applications, and future and perspectives in the field of antimicrobials.

1,434 citations


Journal ArticleDOI
TL;DR: If microbial cellulose can be successfully mass produced, it will eventually become a vital biomaterial and will be used in the creation of a wide variety of medical devices and consumer products.

1,050 citations


Journal ArticleDOI
TL;DR: The conclusion of the study is that FTIR cannot be used directly to identify the presence of PECs, but in combination with XPS (survey and narrow N 1s scans) and solution stability evaluation, a more complete description of the structure can be obtained.

1,009 citations


Journal ArticleDOI
TL;DR: Current protein immobilization strategies, including physical, covalent, and bioaffinity immobilization for the fabrication of protein biochips, are described and particular consideration has been given to oriented immobilization, also referred to as site-specific immobilized, which is believed will improve homogeneous surface covering and accessibility of the active site.

861 citations



Journal ArticleDOI
TL;DR: The original physicochemical, rheological, and biological properties recently unraveled for this complex sulfated aldobiouronan open the way for novel potential applications.

748 citations


Journal ArticleDOI
TL;DR: The objective of the present review is to discuss different aspects of the use of ILs in carbohydrate chemistry, in particular, dissolution and functionalization of simple sugars, cyclodextrins, cellulose, starch, and chitin/chitosan.

632 citations


Journal ArticleDOI
TL;DR: The results indicated that the cellulose nanocrystals could disperse in the WPU uniformly and resulted in an improvement of microphase separation between the soft and hard segments of the W PU matrix.

439 citations


Journal ArticleDOI
TL;DR: Polymersomes that can protect biomolecules in the extracellular environment, are taken up by endocytosis, and then suddenly burst within the early endosome, releasing their contents prior to exposure to the harsh conditions encountered after lysosomal fusion are reported.

Journal ArticleDOI
TL;DR: Though the extent to which GA penetrates into the chitosan fibers is currently unknown, it is evident that the cross-linking resulted in increased brittleness, a color change, and the restriction of fiber sliding that resulted in the loss of a pseudo-yield point.

Journal ArticleDOI
TL;DR: Since acetylation decreased the refractive index of cellulose, regular transmittance of composites comprised of 63% BC nanofiber was improved, and deterioration at 580 nm because of fiber reinforcement was suppressed to only 3.4%.

Journal ArticleDOI
TL;DR: The observations indicate that the junction zone involves dimerization of polymer chains through Ca2+ coordination according to the egg-box model, which involves polymer chains packed on a hexagonal lattice with a lattice constant a = 0.66 nm.

Journal ArticleDOI
TL;DR: The in vivo results clearly indicated that the insulin-loaded NPs could effectively reduce the blood glucose level in a diabetic rat model because of their stability in distinct pH environments.

Journal ArticleDOI
TL;DR: In this paper, the authors synthesize hydrated ionic liquids from various ions having different kosmotropicity, including dihydrogen phosphate (dhp), dibutylphosphate, acetate, lactate, and methanesulfonate as anions.

Journal ArticleDOI
TL;DR: The method of preparation was found to be more important than the starch botanical origin in determining (13)C NMR spectral features of amorphous samples, and shows that the V-type single-helical component increases with amylose content of starches.

Journal ArticleDOI
TL;DR: In this article, water-soluble polysaccharide derivatives bearing side chains endowed with either azide or alkyne terminal functionality have been prepared, which give rise to a 1,3-dipolar cycloaddition reaction resulting in fast gelation.

Journal ArticleDOI
TL;DR: A reversible aggregation of junction zones is found during dehydration and rehydrated gels, and the different stabilities of initial bonds and bonds formed during drying are speculated to be the contribution of MG block or short G blocks in the junction zones.

Journal ArticleDOI
TL;DR: Homogeneous films with a microfibrillated cellulose (MFC) nanofiber content in the range of 10-70 wt % are successfully cast and the ability of the MFC network to maintain its integrity to a strain of at least 8%.

Journal ArticleDOI
TL;DR: By combining disparate polymerization techniques using bifunctional initiators, the mild polymerization conditions allow for the preparation of new block copolymers and hydrogen-bond activation of monomer and initiator/propagating species is proposed as the underlying mechanism, which can be tuned to mitigate adverse side reactions.

Journal ArticleDOI
TL;DR: Polypropylene (PP) coated by a non-leachable biocide was prepared by chemically attaching poly(quaternary ammonium) (PQA) to the surface of PP and the surface grafted with relatively high MW polymers showed almost 100% killing efficiency.

Journal Article
TL;DR: The aim of the study was at assessing whether this material was totally accepted by the host organism and allowed in vivo skin reconstruction of limited area third-degree burns and showed that chitosan materials were well tolerated and promoted a good tissue regeneration.

Journal ArticleDOI
TL;DR: In this article, the design of oligopeptide building blocks with dual enzymatic responsiveness allows to create polymer networks that are formed and functionalized via enzymes and are degradable via other enzymes, both occurring under physiological conditions.

Journal ArticleDOI
TL;DR: To characterize alpha-chitin nanocrystals produced from shrimp shells in regard to crystallite properties and the specific surface area of the chitin nanoparticles, X-ray diffraction data indicate an increase in chit in crystallinity after hydrolysis, as less-ordered chitIn domains are digested.

Journal ArticleDOI
TL;DR: The ability to form elastomeric networks from poly(glycerol-co-sebacate) acrylate (PGSA) under mild conditions while preserving a wide range of physical properties is demonstrated.

Journal ArticleDOI
TL;DR: Bulk rheology measurements show that gastric mucin undergoes a pH-dependent sol-gel transition from a viscoelastic solution at neutral pH to a soft vis coelastic gel in acidic conditions, with the transition occurring near pH 4.


Journal ArticleDOI
TL;DR: This study optimized the UV curable polymer solution composition and laser parameters for the stereolithography machine, resulting in stereolithographically fabricated scaffolds with controlled microstructures that can be useful in diverse tissue engineering applications.

Journal ArticleDOI
TL;DR: A high-strength elastomeric nanocomposite has successfully been prepared by dispersing microcrystalline cellulose in a polyurethane matrix, and shows increased strain-to-failure in addition to increased stiffness and strength compared to the unfilled polyUREthane.