Alireza Motavalizadehkakhky - Academia.edu (original) (raw)
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Papers by Alireza Motavalizadehkakhky
Scientific reports, May 25, 2024
Research on chemical intermediates, May 20, 2024
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Scientific reports, May 20, 2024
Journal of Trace Elements in Medicine and Biology
Biocatalysis and Biotransformation, 2021
This study reports biochemical features of a novel esterase of Bacillus sp. HP 96 isolated from B... more This study reports biochemical features of a novel esterase of Bacillus sp. HP 96 isolated from Bazangan Lake in Iran. The optimum pH and temperature for 53.4 kDa-purified esterase were 8 and 40 °C, respectively. The HPLC technique was used to examine the main compound produced by the enzyme on nitrophenyl derivatives. Vmax and Km of esterase towards 4-nitrophenyl butyrate (p-NPB) were 75.12 µmol.min−1 mg−1 and 4.66 mM, respectively. Organic solvents (15, 30% v/v) did not have a significant effect on the stability of the purified enzyme. The Bacillus sp. HP 96 esterase showed a high compatibility towards various ionic liquids and detergents. In conclusion, the characterized esterase has potential to be used in detergent formularizations and biotechnological processes under harsh conditions.
Journal of Medicinal Plants Research, Feb 9, 2012
Matricaria chamomilla L. or German chamomile is an annual plant of the composite family Asteracea... more Matricaria chamomilla L. or German chamomile is an annual plant of the composite family Asteraceae. In this study, M. chamomilla L. were collected from Neyshabur, Iran. Chemical constituent of essential oils of M. chamomilla L. were determined. Aerial parts (200 gr) were subjected to hydrodistillation in a Clevenger-type apparatus until there was no significant increase in the volume of the oil collected (2.5 h). The yield of the blue oil was 0.9% (w/w). The essential oil was analyzed by GC and GC/MS. Identification of the components was based on GC retention indices computer matching with Wiley GC-MS library, and by comparison of the fragmentation patterns of the mass spectra with those reported in the literature (Adams, 2004). 47 components were identified constituting more than 83.1% of the oil. p-Cymene-8-ol(0.7%), Azulene(0.4%), p-Cymene (1.1%), 1,8-Cineole (2.1%), Artemisia Alcohol (0.2%), β-Elemene (0.9%), cis-β-farnesene (0.9%), trans-β-farnesene (5.2%), Borneol (0.8%), γ-Cadinene (0.4%), Spathulenol (9.4%), γ-Eudesmol (1.5%), α-Bisabolol oxide B(7.0%), α-Bisabolol oxide A (21.5%), α-Bisabolol (5.0%), Chamazulene (4.2%) and Germacrene D (0.8%) were major components in M. chamomilla L. oil. The oil was tested against seven strains of bacteria (Gram-positive and Gramnegative). The oil showed mild to significant antimicrobial activity associated mainly with Gram-positive and Gram-Negative bacteria.
Journal of Engineering
The use of biopolymer material Chitosan impregnated granular activated carbon CHGAC as adsorbent ... more The use of biopolymer material Chitosan impregnated granular activated carbon CHGAC as adsorbent in the removal of lead ions pb.2+ from aqueous solution was studied using batch adsorption mode. The prepared CHGAC was characterized by Scanning Electronic Microscopy (SEM) and atomic-absorption pectrophotometer. The adsorption of lead ions onto Chitosan-impregnated granular activated carbon was examined as a function of adsorbent weight, pH andcontact time in Batch system. Langmuir and Freundlich models were employed to analyze the resulting experimental data demonstrated that better fitted by Langmuir isotherm model than Freundlich model, with good correlation coefficient. The maximum adsorption capacity calculated from the pseudo second order model in conformity to the experimental values. This means that the adsorption performance of lead ions onto CHGAC follows a pseudo second order model, which illustrates that the adsorption of Pb2+ onto CHGAC was controlled by chemisorption...
Bioprocess and Biosystems Engineering
Letters in Organic Chemistry, Jul 31, 2023
Introduction: Dy2Sn2O7 nanoparticles (Dy2Sn2O7 NPs) were generated in the attendance of rheum gum... more Introduction: Dy2Sn2O7 nanoparticles (Dy2Sn2O7 NPs) were generated in the attendance of rheum gum, papaver somniferum gum, ferula assa feotida gum, barberry juice from Dy(NO3)3•5H2O and SnCl4•5H2O. Method: The study of the structure of the specimens verified the generation of nanocatalysts in the scope of 20±5 nm. Synthesized catalysts with a variety of natural compounds were investigated by employing various methods. The characteristics of Dy2Sn2O7 were determined by SEM, TEM, EDX, and XRD. Due to the persistent colloidal stability, high mechanical, thermal sustainability, and high ionic internal character, the system can be deemed as an efficient catalyst by deploying the guest-host approaches. Result: Using industrial waste as raw materials and turning it into valuable products is an important phenomenon in green chemistry. Carbon dioxide is among these substances. This substance is less reactive and it is difficult to use them in a reaction. Conclusion: We announce the employment of CO2, isocyanides, and o-halo anilines in a multicomponent reaction for the production of quinazolines in the participation of Dy2Sn2O7 as a nanocatalyst.
Bioprocess and Biosystems Engineering, Jun 16, 2023
Polycyclic Aromatic Compounds, Apr 22, 2023
Journal of Trace Elements in Medicine and Biology, Jul 1, 2023
Biocatalysis and Biotransformation, Apr 28, 2021
Abstract This study reports biochemical features of a novel esterase of Bacillus sp. HP 96 isolat... more Abstract This study reports biochemical features of a novel esterase of Bacillus sp. HP 96 isolated from Bazangan Lake in Iran. The optimum pH and temperature for 53.4 kDa-purified esterase were 8 and 40 °C, respectively. The HPLC technique was used to examine the main compound produced by the enzyme on nitrophenyl derivatives. Vmax and Km of esterase towards 4-nitrophenyl butyrate (p-NPB) were 75.12 µmol.min−1 mg−1 and 4.66 mM, respectively. Organic solvents (15, 30% v/v) did not have a significant effect on the stability of the purified enzyme. The Bacillus sp. HP 96 esterase showed a high compatibility towards various ionic liquids and detergents. In conclusion, the characterized esterase has potential to be used in detergent formularizations and biotechnological processes under harsh conditions.
International Journal of Biological Macromolecules, Jun 1, 2022
Journal of Polymers and the Environment
Journal of Biomolecular Structure and Dynamics
Journal of Cluster Science
Scientific reports, May 25, 2024
Research on chemical intermediates, May 20, 2024
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Scientific reports, May 20, 2024
Journal of Trace Elements in Medicine and Biology
Biocatalysis and Biotransformation, 2021
This study reports biochemical features of a novel esterase of Bacillus sp. HP 96 isolated from B... more This study reports biochemical features of a novel esterase of Bacillus sp. HP 96 isolated from Bazangan Lake in Iran. The optimum pH and temperature for 53.4 kDa-purified esterase were 8 and 40 °C, respectively. The HPLC technique was used to examine the main compound produced by the enzyme on nitrophenyl derivatives. Vmax and Km of esterase towards 4-nitrophenyl butyrate (p-NPB) were 75.12 µmol.min−1 mg−1 and 4.66 mM, respectively. Organic solvents (15, 30% v/v) did not have a significant effect on the stability of the purified enzyme. The Bacillus sp. HP 96 esterase showed a high compatibility towards various ionic liquids and detergents. In conclusion, the characterized esterase has potential to be used in detergent formularizations and biotechnological processes under harsh conditions.
Journal of Medicinal Plants Research, Feb 9, 2012
Matricaria chamomilla L. or German chamomile is an annual plant of the composite family Asteracea... more Matricaria chamomilla L. or German chamomile is an annual plant of the composite family Asteraceae. In this study, M. chamomilla L. were collected from Neyshabur, Iran. Chemical constituent of essential oils of M. chamomilla L. were determined. Aerial parts (200 gr) were subjected to hydrodistillation in a Clevenger-type apparatus until there was no significant increase in the volume of the oil collected (2.5 h). The yield of the blue oil was 0.9% (w/w). The essential oil was analyzed by GC and GC/MS. Identification of the components was based on GC retention indices computer matching with Wiley GC-MS library, and by comparison of the fragmentation patterns of the mass spectra with those reported in the literature (Adams, 2004). 47 components were identified constituting more than 83.1% of the oil. p-Cymene-8-ol(0.7%), Azulene(0.4%), p-Cymene (1.1%), 1,8-Cineole (2.1%), Artemisia Alcohol (0.2%), β-Elemene (0.9%), cis-β-farnesene (0.9%), trans-β-farnesene (5.2%), Borneol (0.8%), γ-Cadinene (0.4%), Spathulenol (9.4%), γ-Eudesmol (1.5%), α-Bisabolol oxide B(7.0%), α-Bisabolol oxide A (21.5%), α-Bisabolol (5.0%), Chamazulene (4.2%) and Germacrene D (0.8%) were major components in M. chamomilla L. oil. The oil was tested against seven strains of bacteria (Gram-positive and Gramnegative). The oil showed mild to significant antimicrobial activity associated mainly with Gram-positive and Gram-Negative bacteria.
Journal of Engineering
The use of biopolymer material Chitosan impregnated granular activated carbon CHGAC as adsorbent ... more The use of biopolymer material Chitosan impregnated granular activated carbon CHGAC as adsorbent in the removal of lead ions pb.2+ from aqueous solution was studied using batch adsorption mode. The prepared CHGAC was characterized by Scanning Electronic Microscopy (SEM) and atomic-absorption pectrophotometer. The adsorption of lead ions onto Chitosan-impregnated granular activated carbon was examined as a function of adsorbent weight, pH andcontact time in Batch system. Langmuir and Freundlich models were employed to analyze the resulting experimental data demonstrated that better fitted by Langmuir isotherm model than Freundlich model, with good correlation coefficient. The maximum adsorption capacity calculated from the pseudo second order model in conformity to the experimental values. This means that the adsorption performance of lead ions onto CHGAC follows a pseudo second order model, which illustrates that the adsorption of Pb2+ onto CHGAC was controlled by chemisorption...
Bioprocess and Biosystems Engineering
Letters in Organic Chemistry, Jul 31, 2023
Introduction: Dy2Sn2O7 nanoparticles (Dy2Sn2O7 NPs) were generated in the attendance of rheum gum... more Introduction: Dy2Sn2O7 nanoparticles (Dy2Sn2O7 NPs) were generated in the attendance of rheum gum, papaver somniferum gum, ferula assa feotida gum, barberry juice from Dy(NO3)3•5H2O and SnCl4•5H2O. Method: The study of the structure of the specimens verified the generation of nanocatalysts in the scope of 20±5 nm. Synthesized catalysts with a variety of natural compounds were investigated by employing various methods. The characteristics of Dy2Sn2O7 were determined by SEM, TEM, EDX, and XRD. Due to the persistent colloidal stability, high mechanical, thermal sustainability, and high ionic internal character, the system can be deemed as an efficient catalyst by deploying the guest-host approaches. Result: Using industrial waste as raw materials and turning it into valuable products is an important phenomenon in green chemistry. Carbon dioxide is among these substances. This substance is less reactive and it is difficult to use them in a reaction. Conclusion: We announce the employment of CO2, isocyanides, and o-halo anilines in a multicomponent reaction for the production of quinazolines in the participation of Dy2Sn2O7 as a nanocatalyst.
Bioprocess and Biosystems Engineering, Jun 16, 2023
Polycyclic Aromatic Compounds, Apr 22, 2023
Journal of Trace Elements in Medicine and Biology, Jul 1, 2023
Biocatalysis and Biotransformation, Apr 28, 2021
Abstract This study reports biochemical features of a novel esterase of Bacillus sp. HP 96 isolat... more Abstract This study reports biochemical features of a novel esterase of Bacillus sp. HP 96 isolated from Bazangan Lake in Iran. The optimum pH and temperature for 53.4 kDa-purified esterase were 8 and 40 °C, respectively. The HPLC technique was used to examine the main compound produced by the enzyme on nitrophenyl derivatives. Vmax and Km of esterase towards 4-nitrophenyl butyrate (p-NPB) were 75.12 µmol.min−1 mg−1 and 4.66 mM, respectively. Organic solvents (15, 30% v/v) did not have a significant effect on the stability of the purified enzyme. The Bacillus sp. HP 96 esterase showed a high compatibility towards various ionic liquids and detergents. In conclusion, the characterized esterase has potential to be used in detergent formularizations and biotechnological processes under harsh conditions.
International Journal of Biological Macromolecules, Jun 1, 2022
Journal of Polymers and the Environment
Journal of Biomolecular Structure and Dynamics
Journal of Cluster Science