The Experts below are selected from a list of 75 Experts worldwide ranked by ideXlab platform
Dunming Zhu - One of the best experts on this subject based on the ideXlab platform.
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efficient biosynthesis of β alanine with a tandem reaction strategy to eliminate amide by product in the nitrilase catalyzed hydrolysis
Journal of Molecular Catalysis B-enzymatic, 2016Co-Authors: Yanyang Tao, Peiyua Yao, Jing Yua, Jinhui Feng, Mi Wang, Dunming ZhuAbstract:Abstract An efficient biosynthesis of β-alanine from 3-Aminopropionitrile at high concentration has been developed using a one-pot bienzymatic cascade of a nitrilase and an amidase. The nitrilase BjNIT3397 from Bradyrhizobium japonicum strain USDA110 catalyzes the hydrolysis of 3-Aminopropionitrile to β-alanine at the concentration up to 3.0 mol/L with the formation 23% of 3-aminopropanamide. In order to eliminate the by-product 3-aminopropanamide, we cloned and characterized a new amidase from Pseudomonas nitroreducens through gene mining. Under the optimal conditions (50 mmol/L Na2HPO4-NaH2PO4 buffer, pH 6.0, 40 °C), 2.0 mol/L (176 g/L) of 3-aminopropanamide was completely hydrolyzed within 12 h. A tandem reaction system was then established to eliminate the by-product 3-aminopropanamide and increase the production of β-alanine to 90% isolated yield with 15.02 g/(L.h) space-time-yield. These results demonstrated that the tandem reaction strategy was an effective method of eliminating the amide by-products in the nitrilase-catalyzed hydrolysis at high substrate concentration.
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nitrilase catalyzed hydrolysis of 3 Aminopropionitrile at high concentration with a tandem reaction strategy for shifting the reaction to β alanine formation
Journal of Molecular Catalysis B-enzymatic, 2015Co-Authors: Jinhui Feng, Chao Han, Peiyuan Yao, Jing Yuan, Yitao Duan, Min Wang, Dunming ZhuAbstract:Abstract Given the importance of β-alanine, the nitrilase BjNIT3397 from Bradyrhizobium japonicum strain USDA110 was examined toward the hydrolysis of 3-Aminopropionitrile. It has been found that nitrilase BjNIT3397 effectively hydrolyzed 3-Aminopropionitrile with substrate concentration up to 3 M (210 g/L) at the pH 7.3 and temperature 30 °C. With the increase of substrate concentration from 0.6 to 3 M, 3-aminopropanamide was formed and its percentage in the products was increased up to 33%. In order to reduce the formation of 3-aminopropanamide, aspartate ammonia-lyase and fumaric acid were added into the reaction system to consume the byproduct ammonia. As expected, the reaction was shifted toward the formation of β-alanine, resulting in the decrease of 3-aminopropanamide from 33% to 3%. Therefore, a tandem reaction strategy was developed to effectively prevent the formation of 3-aminopropanamide. This might also offer a possibility of producing β-alanine and l -aspartic acid in one process.
Zhong-sheng Wang - One of the best experts on this subject based on the ideXlab platform.
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Highly Efficient and Stable Pure Two-Dimensional Perovskite-Based Solar Cells with the 3-Aminopropionitrile Organic Cation.
ACS applied materials & interfaces, 2020Co-Authors: Yang Zhao, Haoliang Cheng, Ke Zhao, Zhong-sheng WangAbstract:Pure two-dimensional (2D) perovskite (n = 1)-based perovskite solar cells (PSCs) have been proven to have excellent stability against humidity, but the photovoltaic performance is very poor due to the parallel orientation to the substrate and mismatched energy alignment in the PSC device. We report herein a novel bulky organic cation of 3-Aminopropionitrile (3-APN) for constructing a pure 2D hybrid lead-iodide perovskite. The crystal structure of (3-APN)2PbI4 features a stable layered and undistorted PbI6 octahedral geometry (∠Pb-I-Pb = 180°) with a small I···I distance (4.66 A), and the crystals grow in a dominant out-of-plane direction to the substrate. In addition, the existence of an intramolecular H bond between cyano groups and ammonium heads result in an appropriate valence band level of (3-APN)2PbI4 for a well-matched energy level alignment in the device, benefitting the interfacial charge transfer and hence a better photovoltaic performance. As a result, the PSC with the pure 2D (3-APN)2PbI4 perovskite-based PSC achieves a power conversion efficiency of 3.39%, which is the highest value thus far for the pure 2D lead-iodide perovskite family, to the best of our knowledge. More importantly, this pure 2D (3-APN)2PbI4 perovskite-based PSC demonstrates excellent stability against humidity. This work demonstrates that there is great potential to realize efficient and stable pure 2D perovskite-based PSCs through the wise design of organic cations.
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highly efficient and stable pure two dimensional perovskite based solar cells with the 3 Aminopropionitrile organic cation
ACS Applied Materials & Interfaces, 2020Co-Authors: Yang Zhao, Haoliang Cheng, Ke Zhao, Zhong-sheng WangAbstract:Pure two-dimensional (2D) perovskite (n = 1)-based perovskite solar cells (PSCs) have been proven to have excellent stability against humidity, but the photovoltaic performance is very poor due to ...
Yanyang Tao - One of the best experts on this subject based on the ideXlab platform.
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efficient biosynthesis of β alanine with a tandem reaction strategy to eliminate amide by product in the nitrilase catalyzed hydrolysis
Journal of Molecular Catalysis B-enzymatic, 2016Co-Authors: Yanyang Tao, Peiyua Yao, Jing Yua, Jinhui Feng, Mi Wang, Dunming ZhuAbstract:Abstract An efficient biosynthesis of β-alanine from 3-Aminopropionitrile at high concentration has been developed using a one-pot bienzymatic cascade of a nitrilase and an amidase. The nitrilase BjNIT3397 from Bradyrhizobium japonicum strain USDA110 catalyzes the hydrolysis of 3-Aminopropionitrile to β-alanine at the concentration up to 3.0 mol/L with the formation 23% of 3-aminopropanamide. In order to eliminate the by-product 3-aminopropanamide, we cloned and characterized a new amidase from Pseudomonas nitroreducens through gene mining. Under the optimal conditions (50 mmol/L Na2HPO4-NaH2PO4 buffer, pH 6.0, 40 °C), 2.0 mol/L (176 g/L) of 3-aminopropanamide was completely hydrolyzed within 12 h. A tandem reaction system was then established to eliminate the by-product 3-aminopropanamide and increase the production of β-alanine to 90% isolated yield with 15.02 g/(L.h) space-time-yield. These results demonstrated that the tandem reaction strategy was an effective method of eliminating the amide by-products in the nitrilase-catalyzed hydrolysis at high substrate concentration.
Yang Zhao - One of the best experts on this subject based on the ideXlab platform.
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Highly Efficient and Stable Pure Two-Dimensional Perovskite-Based Solar Cells with the 3-Aminopropionitrile Organic Cation.
ACS applied materials & interfaces, 2020Co-Authors: Yang Zhao, Haoliang Cheng, Ke Zhao, Zhong-sheng WangAbstract:Pure two-dimensional (2D) perovskite (n = 1)-based perovskite solar cells (PSCs) have been proven to have excellent stability against humidity, but the photovoltaic performance is very poor due to the parallel orientation to the substrate and mismatched energy alignment in the PSC device. We report herein a novel bulky organic cation of 3-Aminopropionitrile (3-APN) for constructing a pure 2D hybrid lead-iodide perovskite. The crystal structure of (3-APN)2PbI4 features a stable layered and undistorted PbI6 octahedral geometry (∠Pb-I-Pb = 180°) with a small I···I distance (4.66 A), and the crystals grow in a dominant out-of-plane direction to the substrate. In addition, the existence of an intramolecular H bond between cyano groups and ammonium heads result in an appropriate valence band level of (3-APN)2PbI4 for a well-matched energy level alignment in the device, benefitting the interfacial charge transfer and hence a better photovoltaic performance. As a result, the PSC with the pure 2D (3-APN)2PbI4 perovskite-based PSC achieves a power conversion efficiency of 3.39%, which is the highest value thus far for the pure 2D lead-iodide perovskite family, to the best of our knowledge. More importantly, this pure 2D (3-APN)2PbI4 perovskite-based PSC demonstrates excellent stability against humidity. This work demonstrates that there is great potential to realize efficient and stable pure 2D perovskite-based PSCs through the wise design of organic cations.
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highly efficient and stable pure two dimensional perovskite based solar cells with the 3 Aminopropionitrile organic cation
ACS Applied Materials & Interfaces, 2020Co-Authors: Yang Zhao, Haoliang Cheng, Ke Zhao, Zhong-sheng WangAbstract:Pure two-dimensional (2D) perovskite (n = 1)-based perovskite solar cells (PSCs) have been proven to have excellent stability against humidity, but the photovoltaic performance is very poor due to ...
Chao Han - One of the best experts on this subject based on the ideXlab platform.
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nitrilase catalyzed hydrolysis of 3 Aminopropionitrile at high concentration with a tandem reaction strategy for shifting the reaction to β alanine formation
Journal of Molecular Catalysis B-enzymatic, 2015Co-Authors: Jinhui Feng, Chao Han, Peiyuan Yao, Jing Yuan, Yitao Duan, Min Wang, Dunming ZhuAbstract:Abstract Given the importance of β-alanine, the nitrilase BjNIT3397 from Bradyrhizobium japonicum strain USDA110 was examined toward the hydrolysis of 3-Aminopropionitrile. It has been found that nitrilase BjNIT3397 effectively hydrolyzed 3-Aminopropionitrile with substrate concentration up to 3 M (210 g/L) at the pH 7.3 and temperature 30 °C. With the increase of substrate concentration from 0.6 to 3 M, 3-aminopropanamide was formed and its percentage in the products was increased up to 33%. In order to reduce the formation of 3-aminopropanamide, aspartate ammonia-lyase and fumaric acid were added into the reaction system to consume the byproduct ammonia. As expected, the reaction was shifted toward the formation of β-alanine, resulting in the decrease of 3-aminopropanamide from 33% to 3%. Therefore, a tandem reaction strategy was developed to effectively prevent the formation of 3-aminopropanamide. This might also offer a possibility of producing β-alanine and l -aspartic acid in one process.
