Porous Protein Crystals as Reaction Vessels for Controlling Magnetic Properties of Nanoparticles

Abe, Satoshi; Tsujimoto, Masahiko; Yoneda, K.; Ohba, Masaaki; Hikage, Tatsuo; Takano, Mikio; Kitagawa, Susumu; Ueno, Takafumi

doi:10.1002/smll.201101866

Cited by 54 publications

(73 citation statements)

References 51 publications

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“…As can be seen, the crystalline structures can be easily exposed and isolated with the applied selective etching technique, and their tunable surface structures allow the loading and controllable release of a variety of guest molecules. With the crystalline morphology and surface properties precisely manipulated, combined with the excellent thermal and mechanical properties of the base polymer, the as‐prepared polymeric structures may pursue niche advanced applications in fillers, carriers, adsorbents, and so on 38–40…”

Section: Resultsmentioning

confidence: 99%

Unique pressure‐crystallized structures in ternary bisphenol‐a polycarbonate/dioctyl phthalate/fullerene C60 composites

Tian

Liu

Chen

et al. 2012

J of Applied Polymer Sci

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We report pressure-controlled fast growth of unique crystalline structures of bisphenol-A polycarbonate (PC) was achieved by the introduction of both dioctyl phthalate (DOP) and fullerene C60. PC/DOP/C60 ternary composites with an overall good C60 dispersion were prepared by an easy physical and mechanical route, and then crystallized in a piston-cylinder high-pressure apparatus by varying temperature, pressure, crystallization time and composite composition. The crystallization of PC was greatly hastened by the blending with DOP and C60, and its melting point was increased to 288.25 degrees centigrade by the subsequent high-pressure treatment, which was around 40 centigrade higher than that of the samples crystallized at normal pressure.Three-dimensional spiky crystalline spheres were formed with the increase of crystallization temperature, which began with zerodimensional nanogranules, and then developed by merging process through the stages of one-dimensional lamellar crystallites and two-dimensional dendrites. With pressure increased, the granules merged first into plate crystals, and then into micro-spheres with rugged surfaces or porous structures. Also, sometimes the granules organized into rugged crystalline nanoballs, and peony-like stereoopen structures were observed by changing composite composition. The as-prepared three-dimensional crystalline structures, with their large specific areas, may diversify niche functional applications as surface active materials.

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Section: Resultsmentioning

confidence: 99%

Unique pressure‐crystallized structures in ternary bisphenol‐a polycarbonate/dioctyl phthalate/fullerene C60 composites

Tian

Liu

Chen

et al. 2012

J of Applied Polymer Sci

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“…The results indicated that AuNPs@Lys could be successfully used as biocatalysts with superior performance. For examples, Abe et al 87 prepared bimetallic CoPt nanoparticles with different magnetic properties in the inner surface of the CLLC pores by soaking, washing, chemically reducing of Co 2+ and Pt 2+ , along with other treatments. Furthermore, these researchers also demonstrated that the AuNPs@CLLCs and AgNPs@CLLCs can be used as recyclable catalysts in the reduction of 4-nitrophenol to 4-aminophenol.…”

Section: Applications Of Clpcsmentioning

confidence: 99%

Cross-linked protein crystals by glutaraldehyde and their applications

et al. 2015

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Cross-linked protein crystal technology, as either a protein stabilisation or enzyme immobilisation method, has garnered more attention recently. This method not only can retain the original activity of the protein molecule but can also significantly enhance the crystals' mechanical and chemical stability. This review presents the preparation and mechanism of cross-linked protein crystals using glutaraldehyde. The mechanical, chemical and thermal properties of the cross-linked protein crystals are also reviewed in detail. In addition, this paper summarises the applications of cross-linked protein crystals in the fields of materials science, biosensors, chromatographic analysis, oral delivery and protein crystal quality improvement. Finally, the limitations and perspectives on cross-linked protein crystals are presented.Crystallisation is a well-known approach to obtain highly puri-ed proteins. During crystallisation, protein molecules can be Fig. 2 A schematic diagram of the polymerisation of glutaraldehyde. 21This journal is

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“…A similar method was extended to the preparation of inorganic materials in crystals of hen egg white lysozyme (HEWL) 11. 13, 14 Crystals of HEWL have several important advantages; 1) they can be routinely obtained in quantities exceeding several hundred milligrams overnight, 2) various metal ions and metal complexes can be accumulated in solvent channels of the crystals, and 3) HEWL can be crystallized in tetragonal, orthorhombic, and monoclinic lattices by varying the crystallization conditions (Figure 3).…”

Section: Preparation Of Inorganic Materialsmentioning

confidence: 99%

“…Magnetic properties of bimetallic CoPt nanoparticles (CoPt‐NPs) were regulated by the different environments provided by the individual HEWL crystal systems (Figure 3 a). 11 The crystal structure of the tetragonal HEWL obtained in the presence of Pt 2+ ions shows that five Pt 2+ ions are located in the vicinity of Cys6, Arg14, His15, Ser24, and Asn65. In contrast, the crystal structure of the orthorhombic HEWL in the presence of Pt 2+ ions has five binding sites for Pt 2+ ions in the vicinity of Lys1, Cys6, His15, and Asp119 11.…”

Section: Preparation Of Inorganic Materialsmentioning

confidence: 99%