Article
Agricultural Engineering
Jing Liu, Guanyi Chen, Beibei Yan, Weiming Yi, Jingang Yao
Summary: In this study, magnetic whole-cell biocatalysts (MWCBs) were constructed and employed in a magnetically fluidized bed reactor (MFBR) for continuous transesterification of waste frying oil to biodiesel. The optimization of variables led to a maximum biodiesel yield of 89.0±0.6% after 48 hours. MWCBs exhibited satisfactory stability and reusability in the MFBR, and the fuel properties of the obtained biodiesel met international standards. The results indicate the great potential of MWCBs in the industrial production of biodiesel.
BIORESOURCE TECHNOLOGY
(2022)
Article
Energy & Fuels
Shashi Kant Bhatia, Ravi Kant Bhatia, Jong-Min Jeon, Arivalagan Pugazhendhi, Mukesh Kumar Awasthi, Dinesh Kumar, Gopalakrishnan Kumar, Jeong-Jun Yoon, Yung-Hun Yang
Summary: Biodiesel is a non-toxic renewable energy source that is gaining global attention, with various technologies developed for industrial production, where biobased technology is considered advantageous.
Article
Engineering, Chemical
Ines Reyero, Luis M. Gandia, Gurutze Arzamendi
Summary: The sound propagation speed measurement method is used to monitor triglyceride ethanolysis under various reaction conditions. Experimental results show a slight increase in sound propagation speed during the reaction, but accurately estimating the sound speed at the ethanol/oil interface remains challenging. Despite this, the method successfully predicts the evolution of the reaction, but shows deviations in estimating the conversion rate at the beginning of the reaction.
Article
Nanoscience & Nanotechnology
Mater H. Mahnashi, Veeranna S. Hombalimath, Shameen Sultana, Ibrahim Ahmed Shaikh, Rasha Hamed Al-Serwi, Mohamed El-Sherbiny, Uday M. Muddapur, Mohammed M. Ghoneim, A. Sharanappa, Laxmikant R. Patil, Anil R. Shet, Basheerahmed Abdulaziz Mannasaheb, Yahya S. Alqahtani, S. V. Desai, Aejaz Abdullatif Khan, Mohammad Shahzad Samdani, S. M. Shakeel Iqubal
Summary: The primary goal of this study was to convert waste cooking oil into biodiesel using immobilized lipase enzyme from Bacillus halotolerans. The optimal conditions for enzymatic transesterification were determined, and the factors affecting biodiesel yield were analyzed. The study also demonstrated the reusability of the immobilized lipase enzyme and confirmed the characteristics of biodiesel. The proposed technique has the potential to reduce production costs and simplify waste cooking oil disposal.
SCIENCE OF ADVANCED MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
M. R. Atelge
Summary: Biodiesel and hydrogen production efficiencies were evaluated using a heterogeneous catalyst derived from spent coffee grounds. The biodiesel yield was 91.57%, and 100% conversion was observed for hydrogen production. The regenerated catalyst showed similar performance to the first cycle. Both transesterification and methanolysis reactions were found to be endergonic and unspontaneous.
Article
Energy & Fuels
Manel Ayadi, Farah Nurul Anisa Saragih, Sary Awad, Cindy Priadi, Manef Abderrabba, Mohand Tazerout, Yves Andres
Summary: Olive pomace (OP) and olive pomace oil (OPO) are by-products of olive oil processing that can be utilized for biodiesel production. Through a series of chemical processes, OPO was converted into biodiesel using sulfuric acid as a catalyst. The optimized conditions for the esterification reaction yielded biodiesel with physical and chemical properties meeting standards, with the solid catalyst being regenerated and reused multiple times.
Review
Chemistry, Multidisciplinary
Niklas Adebar, Alina Nastke, Harald Groeger
Summary: By combining continuous flow processing and biocatalysis, efficient, stable, and cost-effective processes can be achieved. Recent years have seen significant progress in the rational design of recombinant whole-cell catalysts. The combination of these powerful catalysts with continuous reactor concepts is emerging, with applications in packed bed reactors, microchannels, and biofilm reactors.
REACTION CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Soumaya Bouguerra Neji, Asma Chaari, Miguel Ladero Galan, Fakher Frikha, Mohamed Bouaziz
Summary: This study investigated the production of polyol ester from esterification of acid (OA) and glycerol, which yielded high concentrations of monoglycerides. The optimal reaction conditions were 200°C reaction temperature, 0.2% w/w catalyst KSF, and a glycerol/oleic acid ratio of 3:1, resulting in a yield of 71.8% and a selectivity of 80%.
Article
Biotechnology & Applied Microbiology
Dominic O. Onukwuli, Jonah C. Umeuzuegbu, Callistus N. Ude, Chukwuemeka C. Nwobi-Okoye
Summary: This study focuses on the kinetic modeling of homogeneous catalyzed transesterification of neem seed oil and the determination of rate-limiting step (RLS). The experiments showed that the rate constant values for forward reactions were higher than those of backward reactions at different temperatures, leading to the identification of the RLS.
BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR
(2021)
Review
Biotechnology & Applied Microbiology
Mengqi Ye, Yuqi Ye, Zongjun Du, Guanjun Chen
Summary: Whole-cell biocatalysts utilizing yeast cell-surface display system show enhanced enzyme performance by overcoming substrate transport limitations, making it a promising method for developing novel and improved engineered biocatalysts.
BIOPROCESS AND BIOSYSTEMS ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Adeyinka S. Yusuff, Aman K. Bhonsle, Dinesh P. Bangwal, Neeraj Atray
Summary: A highly efficient barium-modified zeolite (Ba-ZEL) catalyst was developed through optimizing thermal treatment temperature, biodiesel production process conditions, and catalyst performance, leading to the maximum biodiesel yield meeting the standard requirements under the optimum conditions.
Article
Chemistry, Multidisciplinary
Chandra Sekhar Sriharikota, Karuppasamy Karuppasamy, Vedaraman Nagarajan, Ravishankar Sathyamurthy, Bharathwaaj Ramani, Venkatesan Muthu, Sathiyamoorthy Karuppiah
Summary: The rapid growth of industrialization has led to an increasing demand for energy, with the world heavily relying on petroleum as a major fuel source. Research shows that using biodiesel blends can reduce emissions of harmful substances in exhaust gases, but may also increase the emission of CO2 and NOx.
Article
Biotechnology & Applied Microbiology
Hongyan Pan, Shangfeng Chang, Ying Qu, Mingxin Liu, Wei Tian, Zunxue Chang
Summary: In this study, hydrocortisone was successfully synthesized from progesterone for the first time using engineered Escherichia coli strains with assembled P450s in an artificial cascade reaction. The efficient biosynthetic pathway of deoxycortisone from progesterone was constructed, and a three-P450-modules co-expression system of E. coli C43(DE3) named hyg4 was developed. The total production of hydrocortisone reached 16.82 μmol/L within 24 hours.
BIOCHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Ilknur Alibas, Aslihan Yilmaz, Kamil Alibas, Murat Arslan, Caner Koc
Summary: Seven microalgae species were dried using four different drying methods, and biodiesel was produced from the dried microalgae. The highest vegetable oil yield and biodiesel yield were obtained in Schizochytrium dried by spray technique. The microwave drying method resulted in the lowest cloud point for Botryococcus braunii and the highest pour point and freezing point for Chlorella variabilis. Schizochytrium and Nitzschia were found to be the most suitable microalgae species for biodiesel production. Among the drying methods, spray drying produced the most successful results for biodiesel production from Schizochytrium.
BIOMASS & BIOENERGY
(2023)
Article
Chemistry, Physical
Yuanzhong Li, Liling Li, Yufa Feng, Huize Wang, Jinyun Liao, Jianwei Ren, Weiyou Zhou, Mingyang He, Hao Li
Summary: Engineering cost-effective and high-performing bifunctional catalysts for ammonia borane (AB) hydrolysis and methanolysis is crucial for their commercial availability. This study produced a series of rattle-structured CuO/Co3O4@C microsphere bifunctional catalysts for AB hydrolysis and methanolysis using a simple hard template etching approach. The CuO/Co3O4@C-4 catalyst exhibited the best activity for AB hydrolysis and methanolysis due to its unique rattle structure and synergetic effect between Co3O4 and CuO. Kinetic isotope effect (KIE) experiments and infrared spectroscopy were used to investigate the reaction mechanisms, and a proposed mechanism for AB methanolysis on CuO/Co3O4@C-4 was based on the experimental results. This work provides valuable guidance for the construction of high-performance bifunctional catalysts for AB hydrolysis and methanolysis for hydrogen production.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Justin A. Simanis, C. Marshall Law, Erica L. Woodall, Christopher G. Hamaker, John R. Goodell, T. Andrew Mitchell
CHEMICAL COMMUNICATIONS
(2014)
Article
Ecology
Carie B. Weddle, Sandra Steiger, Christopher G. Hamaker, Geoffrey D. Ower, Christopher Mitchell, Scott K. Sakaluk, John Hunt
Article
Chemistry, Inorganic & Nuclear
Delanie J. Losey, Blaise A. Frenzel, William M. Smith, Sean E. Hightower, Christopher G. Hamaker
INORGANIC CHEMISTRY COMMUNICATIONS
(2013)
Article
Chemistry, Inorganic & Nuclear
Blaise A. Frenzel, Christopher G. Hamaker, Sean E. Hightower
INORGANIC CHEMISTRY COMMUNICATIONS
(2014)
Article
Chemistry, Organic
Erica L. Woodall, Justin A. Simanis, Christopher G. Hamaker, John R. Goodell, T. Andrew Mitchell
Article
Chemistry, Inorganic & Nuclear
Blaise A. Frenzel, Zorineh Mergerdichian, Josh E. Schumaker, Cole T. Kuester, Christopher G. Hamaker, Sean E. Hightower
Article
Chemistry, Organic
Cassie A. Goodman, Joel B. Eagles, Leandre Rudahindwa, Christopher G. Hamaker, Shawn R. Hitchcock
SYNTHETIC COMMUNICATIONS
(2013)
Article
Biochemistry & Molecular Biology
Gideon K. Yawson, Samantha E. Huffman, Samuel S. Fisher, Paige J. Bothwell, David C. Platt, Marjorie A. Jones, Gregory M. Ferrence, Christopher G. Hamaker, Michael Webb
Summary: Alzheimer's disease is characterized by extracellular protein deposits containing the peptide amyloid-beta. Metallotherapeutics show promise in targeting soluble A beta to prevent aggregation and cytotoxicity. Studies have shown that thiazole-based derivatives and other complexes with hydrogen-bonding functional groups can effectively prevent A beta aggregation.
JOURNAL OF INORGANIC BIOCHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Michael J. Celestine, Mark A. W. Lawrence, Olivier Schott, Vincent Picard, Garry S. Hanan, Emily M. Marquez, Chekeyl G. Harold, Cole T. Kuester, Blaise A. Frenzel, Christopher G. Hamaker, Sean E. Hightower, Colin D. McMillen, Alvin A. Holder
Summary: The synthesis and structure elucidation of [Co(tpy)(phen)Cl](PF6)2?0.25CH3CN were investigated, with the compound showing promising electrocatalytic and photocatalytic hydrogen evolution activities.
INORGANICA CHIMICA ACTA
(2021)
Article
Crystallography
Patricia E. Goettler, Christopher G. Hamaker
Summary: The two related compounds have similar structures with nitrogen substitution differences. Both compounds have N-methylamino and 4-nitro groups that are nearly coplanar with the benzene ring. The crystal structures of both compounds exhibit intermolecular interactions.
JOURNAL OF CHEMICAL CRYSTALLOGRAPHY
(2022)
Article
Chemistry, Organic
Brad J. Austermuehle, Erin S. Collins, Christopher G. Hamaker, Shawn R. Hitchcock
Summary: A new synthetic methodology has been developed for the synthesis of N-alkyl and N-aryl arenesulfinamides with yields up to 90%. However, the level of diastereoselection with racemic or enantiomerically enriched amines only reached a level of 54:46 favoring the major diastereomer as determined by analysis of the 500 MHz H-1 NMR spectra.
SYNTHETIC COMMUNICATIONS
(2021)
Article
Chemistry, Organic
Jordan M. Witte, Jasmine Service, Marian Aba Addo, Bader Semakieh, Erin Collins, Christopher Sams, Timothy R. Dorsey, Elizabeth Garrelts, Cassidy A. Blumenshine, Trace Cooper, Moses Martinez, Christopher G. Hamaker, Gregory M. Ferrence, Shawn R. Hitchcock
Summary: The treatment of beta-hydroxy alpha-p-methoxyphenoxy carboxylic acids derived from the asymmetric glycolate aldol addition reaction with p-nitrobenzenesulfonyl chloride showed divergent results depending on the nature of the beta-substituent of the carboxylic acid. Different beta-substituents yielded different compounds.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Stephen Mensah, Joseph D. Rosenthal, Mamta Dagar, Tyson Brown, Jonathan J. Mills, Christopher G. Hamaker, Gregory M. Ferrence, Michael I. Webb
Summary: The evolution of high virulence bacterial strains has led to the development of novel therapeutic agents. Metal-based therapeutics, with their structural variability and unique modes of action, show great promise. This study focused on the preparation and evaluation of ruthenium(ii)-arene complexes containing Schiff base ligands with an attached ferrocene, and identified a complex with prominent activity against clinically relevant bacterial strains.
DALTON TRANSACTIONS
(2022)
Article
Biochemistry & Molecular Biology
Samantha E. Huffman, Gideon K. Yawson, Samuel S. Fisher, Paige J. Bothwell, David C. Platt, Marjorie A. Jones, Christopher G. Hamaker, Michael Webb
Article
Chemistry, Multidisciplinary
Edward W. Li, Jade Katinas, Marjorie A. Jones, Christopher G. Hamaker
Summary: Leishmaniasis is a highly complex infectious disease that primarily relies on chemotherapies for treatment. A study discovered new compounds with lower IC50 values against Leishmania in vitro and showed strong intermolecular interactions in the crystalline state through X-ray crystallography analysis.
NEW JOURNAL OF CHEMISTRY
(2021)