• Title/Summary/Keyword: nanomaterial

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Inorganic nanomaterial-based biocatalysts

  • Lee, Soo-Youn;Lee, Ji-Ho;Chang, Jeong-Ho;Lee, Jin-Hyung
    • BMB Reports
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    • v.44 no.2
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    • pp.77-86
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    • 2011
  • Over the years, nanostructures have been developed to enable to support enzyme usability to obtain highly selective and efficient biocatalysts for catalyzing processes under various conditions. This review summarizes recent developments in the nanostructures for enzyme supporters, typically those formed with various inorganic materials. To improve enzyme attachment, the surface of nanomaterials is properly modified to express specific functional groups. Various materials and nanostructures can be applied to improve both enzyme activity and stability. The merits of the incorporation of enzymes in inorganic nanomaterials and unprecedented opportunities for enhanced enzyme properties are discussed. Finally, the limitations encountered with nanomaterial-based enzyme immobilization are discussed together with the future prospects of such systems.

Synthesis, Anticancer and Antioxidant Activity of Novel 2,4-Disubstituted Thiazoles

  • Tran, Nguyen Minh An;Kumar, Mungara Anil;Chang, Seung Hyun;Kim, Mi Yeong;Kim, Jung-Ae;Lee, Kap Duk
    • Bulletin of the Korean Chemical Society
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    • v.35 no.6
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    • pp.1619-1624
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    • 2014
  • A new series of carbazole based 2,4-disubstituted thiazole derivatives were synthesized. All the synthesized compounds were tested for their cytotoxicity against three different cancer cell lines A549, MCF-7, and HT29. Some of these compounds showed good cytotoxicity. These compounds were also evaluated for antioxidant activity. Compounds 3a, 3b, 3d-f and 3i showed higher antioxidant activity than standard BHT.

Challenges and Perspectives of Nanoparticle Exposure Assessment

  • Lee, Ji-Hyun;Moon, Min-Chaul;Lee, Joon-Yeob;Yu, Il-Je
    • Toxicological Research
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    • v.26 no.2
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    • pp.95-100
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    • 2010
  • Nanoparticle exposure assessment presents a unique challenge in the field of occupational and environmental health. With the commercialization of nanotechnology, exposure usually starts from the workplace and then spreads to environment and consumer exposure. This report discusses the current trends of nanoparticle exposure assessment, including the definition of nanotechnology relevant terms, essential physicochemical properties for nanomaterial characterization, current international activities related nanomaterial safety, and exposure assessment standard development for nanotechnology. Further this report describes challenges of nanoparticle exposure assessment such as background measurement, metrics of nanoparticle exposure assessment and personal sampling.

Solubility and Storage Stability of Astaxanthin (Astaxanthin의 용해특성 및 저장 안정성)

  • Kim, So-Young;Cho, Eun-Ah;Yoo, Ji-Min;In, Man-Jin;Chae, Hee-Jeong
    • KSBB Journal
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    • v.23 no.6
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    • pp.546-550
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    • 2008
  • Basic characteristics of astaxanthin including solubility and stability were investigated. Astaxanthin showed a very poor solubility in water, but it was highly soluble in organic solvents such as acetone and acetic acid. The solubility of astaxanthin in acidic condition was 10-20 times higher than those in neutral and basic conditions. Astaxanthin was very unstable in acidic condition under UV irradiation and in the presence of oxygen. Also, heating even for a very short time accelerated the degradation of astaxanthin. In conclusion, it is required to enhance the water-solubility and stability of astaxanthin for industrial application in food and cosmetic area.

Characterization of nano-structure pyrolytic char for smart and sustainable nanomaterials

  • N. K. Karthikeyan;S. Elavenil
    • Advances in nano research
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    • v.16 no.1
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    • pp.53-69
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    • 2024
  • Advancements in the technology of building materials has led to diverse applications of nanomaterials with the aim to monitor concrete structures. While there are myriad instances of the use of nanoparticles in building materials, the production of smart nano cement-composites is often expensive. Thereupon, this research aims to discover a sustainable nanomaterial from tyre waste using the pyrolysis process as part of the green manufacturing circle. Here, Nano Structure Tyre-Char (NSTC) is introduced as a zero-dimension carbon-based nanoparticle. The NSTC particles were characterized using various standard characterization techniques. Several salient results for the NSTC particles were obtained using microscopic and spectroscopic techniques. The size of the particles as well as that of the agglomerates were reduced significantly using the milling process and the results were validated through a scanning electron microscope. The crystallite size and crystallinity were found to be ~35nm and 10.42%, respectively. The direct bandgap value of 5.93eV and good optical conductivity at 786 nm were obtained from the ultra violet visible spectroscopy measurements. The thermal analysis reveals the presence of a substantial amount of carbon, the rate of maximum weight loss, and the two stages of phase transformation. The FT-Raman confirms the presence of carboxyl groups and a ID/IG ratio of 0.83. Water contact angle around 140° on the surface implies the highly hydrophobic nature of the material and its low surface energy. This characteristic process assists to obtain a sustainable nanomaterial from waste tyres, contributing to the development of a smart building material.

Photocatalytic Performance of Graphene-TiO2 Hybrid Nanomaterials Under Visible Light

  • Park, Jaehyeung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.32 no.2
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    • pp.161-164
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    • 2019
  • This study describes the development of graphene-$TiO_2$ conjugates for the enhancement of the photocatalytic efficiency of $TiO_2$. Graphene-based hybrid nanomaterials have attracted considerable attention because of the unique and advantageous properties of graphene. In the proposed hybrid nanomaterial, graphene serves as an electron acceptor to ensure fast charge transfer. Effective charge separation can, therefore, be achieved to slow down electron-hole recombination. This results in an enhancement of the photocatalytic activity of $TiO_2$. In addition, increased adsorption and interactions with the adsorbed reagents also lead to an improvement in the photocatalytic activity of graphene-$TiO_2$ hybrid nanomaterials. The acquired result is encouraging in that the photocatalytic activity of $TiO_2$ was initiated using visible light (630 nm) instead of the typical UV light.

A proton induced X-ray emission (PIXE) analysis of concentration of major/trace and toxic elements in broiler gizzard and flesh of Tehsil Gujar Khan area in Pakistan

  • Nadeem, Khawar;Hussain, Javaid;Haq, Noaman Ul;Haq, A. Ul;Akram, Waheed;Ahmad, Ishaq
    • Nuclear Engineering and Technology
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    • v.51 no.8
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    • pp.2042-2049
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    • 2019
  • Ten gizzard and three flesh samples of the broiler were collected from different locations in Tehsil Gujar Khan District Rawalpindi, Pakistan. The samples were dried, crushed and ground. Pellets were prepared by pressing the powder of the samples and that of the Bovine liver 1577c reference material obtained from NIST, USA. Proton induced X-ray emission (PIXE) installed at National Center for Physics, Islamabad, Pakistan has been used as a reliable and improved technique to determine concentration of various major/trace and toxic elements e.g. S, Cl, K, Ca, Cl, Fe, Cu, Mn, Co, Zn, Ti, Cd, Ga, Cr, V and Ni, in the Gizzard and Flesh samples of the broiler. The concentrations of all the detected elements in the samples are statistically significant. The certified and measured values of the elements in the reference material were in agreement with each other within a deviation of 7%. S, Cl, K and Ca are within tolerable limits and are good for human consumption. Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn were more than the acceptable limits of World Health Organization, WHO whereas Ga, As, Sn, Sb and Pb are not detected in most of the samples.