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Biomimetic Scaffold Fabrication for Tissue Engineering
Published in Gilson Khang, Handbook of Intelligent Scaffolds for Tissue Engineering and Regenerative Medicine, 2017
Junghwa Cha, Hyun-Gu Yim, Su-Hwan Kim, Pilnam Kim, Nathaniel S. Hwang
Chemical agents for effective decellularization include acids and bases; hypotonic and hypertonic solutions (e.g., ethylenediaminetetraacetic acid [EDTA], aminopolycarboxylic acid [EGTA]); ionic, nonionic, or zwitterionic detergents (e.g., sodium dodecyl sulfate [SDS], Triton X-100, CHAPS); alcohols; and other solvents. Every agent and method can alter the matrix composition and also cause disruption of the structure. As these agents can alter the matrix composition and disrupt the structure of the proteins in the ECM, controlling types, exposure time, and rinse time of detergents are important to minimize the degree of undesirable protein loss from the tissue or organ.
Uranium(VI) complexation with trans-1,2-cyclohexanediaminetetraacetic acid in solution: thermodynamic and structural studies
Published in Journal of Coordination Chemistry, 2020
Wen Chen, Baihua Chen, Bijun Liu, Yuchuan Yang, Jun Tu, Hongyuan Wei, Yanqiu Yang, Xingliang Li, Shunzhong Luo
Knowledge of chemical species formed by uranium(VI) with aminopolycarboxylic acids, which are present in all nuclear wastes, as well as their stability constants, enthalpies, entropies and structures, are useful to better understand the chemical behavior of uranium(VI) in the processing and disposal of nuclear wastes [1–4]. CDTA (trans-1,2-cyclohexanediaminetetraacetic acid) is a well-known aminopolycarboxylic acid, which has the same skeleton as EDTA (ethylenediaminetetraacetic acid) except the ethylene group is substituted by a cyclohexane ring. Because of its similarity to EDTA, especially the chelating nature, CDTA has been suggested for use in the Actinide Lanthanide Separation (ALSEP) and Group Actinide Extraction (GANEX) processes [5–7]. There are few publications regarding to the complexation of uranium(VI) with CDTA [8, 9]. Particularly, no enthalpy and entropy data are available for U(VI)-CDTA complexes. Reported chemical species and structural analyses for U(VI)-CDTA complexes have some deficiencies, which are mentioned in the following.
Oxidative degradation stability and hydrogen sulfide removal performance of dual-ligand iron chelate of Fe-EDTA/CA
Published in Environmental Technology, 2018
Xinmei Miao, Yiwen Ma, Zezhi Chen, Huijuan Gong
In general, an aminopolycarboxylic acid, such as ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), diethylenetriaminepenta acetic acid (DTPA), or N-hydroxyethylethylenediaminetriacetic acid (HEDTA), was chosen as the chelating agent [10] to produce iron chelate. EDTA is the most commonly used chelating agent in practice for its cheapness and easily available. As demonstrated in the literature of [4,10,11], it is possible to achieve complete removal of H2S from biogas using Fe-EDTA solution with appropriate operation conditions. However, the H2S removal efficiency would decrease significantly, in case that the iron chelate degrades [12,13]. Along with the degradation of iron chelate, the precipitate mixtures of ferric hydroxide, ferrous hydroxide, and ferrous sulfide generate, leading to the decrease of iron chelate concentration; therefore, fresh iron chelate should be supplemented to maintain trouble-free operation of the desulfurization process. This would cause a significant increase in the operation cost. Thus, preventing the chelated iron from degradation is the key issue for the application of catalytic oxidation desulfurization technology.
Selective electrochemical machining of the steel molds in hot isostatic pressing of Ti6Al4V powder
Published in Materials and Manufacturing Processes, 2018
Fabio Scherillo, Antonello Astarita, Umberto Prisco, Antonino Squillace
Concentrated saline solutions have been proved to be effective in anodic dissolution of steel,[23,24] while it is well known that titanium and its alloys have a high resistance to dissolution under these conditions. The question is then to find a way to dissolve the titanium–steel interface which develops during the HIP process. The ethylenediaminetetraacetic acid (EDTA), an aminopolycarboxylic acid, that forms very stable chelates in aqueous solution with the main constituent of stainless steel, Fe, Cr, and Ni, could resolve this problem. As will be discussed in details, the addition of EDTA to the electrochemical solution allows dissolving both the steel mold and the interface layer. The dissolution process therefore reaches the bulk of the compact demonstrating the possibility to produce a true near-net shape component.