Article
Energy & Fuels
Ricardo Garcia-Morales, Abel Zunigo-Moreno, Francisco J. Veronico-Sanchez, Jose Domenzain-Gonzalez, Hugo I. Perez-Lopez, Christian Bouchot, Octavio Elizalde-Solis
Summary: The aim of this study was to synthesize fatty acid methyl esters from waste beef tallow using one-step supercritical methanol transesterification without pre-treatment. Animal waste samples were collected from local markets and experiments were conducted in a batch reactor made of Inconel 625 alloy. Various parameters such as methanol:waste beef tallow molar ratio, temperature, and pressure were investigated to obtain the fatty acid methyl esters, which were then characterized and the overall yield was calculated.
Article
Green & Sustainable Science & Technology
Miquele L. Padula, Arthur S. Romero, Dachamir Hotza, Murilo D. M. Innocentini, Maria E. G. Pinto, Augusto S. Pedrini, Evertan Rebelatto, Luiz Fernando B. Ribeiro, Guilherme Zin, J. Vladimir Oliveira, Marco Di Luccio
Summary: This study investigated the efficiency of microfiltration with a polymeric membrane for the dehydration of fatty acid ester mixtures. The modified membrane showed improved performance with higher fluxes and enhanced dehydration compared to the unmodified control membrane.
Article
Polymer Science
Celeste Libretti, Michael A. R. Meier
Summary: In this study, direct transesterification of cellulose was achieved and cellulose esters with different degrees of substitution were successfully synthesized. The obtained cellulose esters exhibited good thermal stability, UV absorption, and antioxidant properties. Additionally, the switchable solvent system demonstrated excellent recyclability.
Article
Chemistry, Medicinal
Itzel Y. Lopez-Pacheco, Victoria Guadalupe Ayala-Moreno, Catherinne Arlette Mejia-Melara, Jose Rodriguez-Rodriguez, Sara P. Cuellar-Bermudez, Reyna Berenice Gonzalez-Gonzalez, Karina G. Coronado-Apodaca, Leonardo I. Farfan-Cabrera, Georgia Maria Gonzalez-Meza, Hafiz M. N. Iqbal, Roberto Parra-Saldivar
Summary: The production of biomolecules by microalgae has a wide range of applications, and microalgae biomass can be produced using waste in a smaller space, showing its great potential as a source of biomass.
Article
Thermodynamics
Xiong Zheng, An Huang, Yanqiong Bao, Sheng Wang, Guangzhao Qin, Yu Liu
Summary: The thermal conductivity of fuels plays an important role in determining the temperature distribution of engines and heat transfer systems. This study provides accurate thermal conductivity data for the main components of biodiesels, fatty acid methyl esters (FAMEs), through experimental measurements.
FLUID PHASE EQUILIBRIA
(2022)
Article
Biochemistry & Molecular Biology
Maria Carolina Pereira Goncalves, Jessica Cristina Amaral, Roberto Fernandez-Lafuente, Ruy de Sousa Junior, Paulo Waldir Tardioli
Summary: This paper investigated the Lipozyme 435-catalyzed synthesis of xylose oleate in MEK, studying the effects of substrate ratios, temperature, and time on esterification rates. Results showed that an excess of oleic acid was favorable for the reaction, and the highest Lipozyme 435 activities occurred between 55 and 70 degrees C. The study also found that the predicted kinetic model fitted well with experimental data and there was no evidence of inhibitions.
Review
Energy & Fuels
Carsten Wedler, J. P. Martin Trusler
Summary: Biodiesel fuels are comprised of a mixture of different fatty acid esters, which have significant effects on combustion and storage. This study reviews the available experimental data on density and viscosity of fatty acid methyl, ethyl, and butyl esters and identifies gaps in the literature. The research includes 16 different esters from three ester families and provides an overview of generalized models for describing density and viscosity at elevated pressures.
Article
Engineering, Chemical
Arthur Santos Romero, Murilo Daniel de Mello Innocentini, Dachamir Hotza, J. Vladimir Oliveira
Summary: This study proposes the use of membrane separation to polish industrial enzymatic fatty acid methyl esters (FAME). Results show that the 10 kDa ultrafiltration (UF) membrane can effectively remove impurities and improve the color and contamination of FAME samples.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Biochemistry & Molecular Biology
Zainab Adenike Ayinla, Adedeji Nelson Ademakinwa, Femi Kayode Agboola
Summary: The study aimed to predict the 3D structure of RoZAC3 lipase, investigate its interactions with natural substrates, and evaluate the feasibility of using immobilized lipase for FAME production. Protein identification and homology modeling techniques were used to construct the 3D structure and perform docking studies. The immobilized lipase showed high conversion in the transesterification reaction, indicating its potential application in biodiesel production.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2023)
Article
Chemistry, Multidisciplinary
Mohammad Yazdanpanah, Mohammad Fereidooni, Victor Marquez, C. V. Paz, Tinnakorn Saelee, Martin Salazar Villanueva, Meena Rittiruam, Patcharaporn Khajondetchairit, Supareak Praserthdam, Piyasan Praserthdam
Summary: Recently, there has been an increased interest in converting bio-derived FAMEs into added-value products. This study focuses on the preparation of catalysts with different levels of oxygen vacancies and their effect on selectivity. The highest level of oxygen vacancy showed the maximum selectivity. Additionally, the rate of ketone formation was found to be directly proportional to acid density.
Article
Materials Science, Multidisciplinary
Tolibjon S. Omonov, Vinay R. Patel, Jonathan M. Curtis
Summary: This work presents a model biobased epoxy thermoset resin that incorporates epoxidized linseed oil fatty acid methyl esters (ELOMEs) and trimellitic anhydride (TMA) as a curing agent. The study investigates the effects of different molar ratios of ELOME and TMA on the storage moduli, glass-transition temperatures, and thermomechanical properties of the resulting thermosets. The results indicate that the concentration of the curing agent influences the crosslinking density and affects the formation of the cross-linked network, while the use of ELOME/ELO mixtures leads to an improvement in the thermomechanical properties due to the branched triacylglycerol structure of epoxidized linseed oil.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Pinku Tung, Neal P. Mankad
Summary: A light-mediated, Cu-catalyzed process has been developed for directly producing aliphatic, symmetric acid anhydrides from alkyl (pseudo)halides in a single step without the need for precious metal additives. This transformation utilizes simple Cu salts and abundant bases to generate a heterogeneous Cu0 photocatalyst in situ, maintaining high efficiency and selectivity upon scale-up, and operates via a radical mechanism with several advantageous features. This discovery will facilitate the engineering of efficient and sustainable bulk processes for producing commodity anhydrides.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Engineering, Chemical
Noor Raihana Abu Sepian, Nur Hidayah Mat Yasin, Nagaarasan Ramesh
Summary: The study compared the performance of microalgae cells immobilized in different ratios of matrices in terms of cell density and lipid yield, finding that the 0.3:1 SACACMC/Mc matrix achieved the highest cell density and lipid production.
CHEMICAL ENGINEERING & TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Saw Hong Loh, Mee Kee Chen, Nur Syazana Fauzi, Ahmad Aziz, Thye San Cha
Summary: This study introduces a direct transesterification method for the rapid production of FAMEs and fatty acid analysis in microalgae using freshly harvested biomass. The results demonstrate that the DT method significantly increases FAMEs recovery compared to the conventional OET method, highlighting the importance of certain fatty acids in the membranes of microalgae cells.
SCIENTIFIC REPORTS
(2021)
Article
Energy & Fuels
X. R. Wang, Wenhua Xue, Wenqiang Sun, Shiting Tang, Genzhu Jiang
Summary: In this study, the evaporation and micro-explosion characteristics of blended droplets at different temperatures were investigated using methyl palmitate (MP) and methyl oleate (MO) as fuels. When MP was pure, no micro-explosion occurred, but it was observed in all blended droplets. The optimal micro-explosion intensity, evaporation rate, micro-explosion delay time, and evaporation duration were all achieved when the MP concentration was 20% at both 773 K and 973 K. Micro-explosions were categorized into strong micro-explosions, weak micro-explosions, and puffing. Cleavage reaction in MO increased the intensity of micro-explosions, while polymerization inhibited evaporation. The residual volume caused by polymerization decreased with increasing MP concentration. A new relationship between evaporation rate, micro-explosion intensity, and ambient temperature was established through numerical fitting.
Article
Environmental Sciences
Ana Filipa L. O. M. Santos, Juliana A. S. A. Oliveira, Maria D. M. C. Ribeiro da Silva, Manuel J. S. Monte
Article
Ophthalmology
Amelia Martins, Claudia Farinha, Miguel Raimundo, Marta Lopes, Ana Rita Santos, Pedro Melo, Marco Marques, Joao Pedro Marques, Patricia Barreto, Maria Luz Cachulo, Catarina Neves, Jose Cunha-Vaz, Rufino Silva
OPHTHALMIC RESEARCH
(2018)
Article
Endocrinology & Metabolism
Catharina Busch, Samantha Fraser-Bell, Dinah Zur, Patricio J. Rodriguez-Valdes, Zafer Cebeci, Marco Lupidi, Adrian T. Fung, Pierre-Henry Gabrielle, Ermete Giancipoli, Voraporn Chaikitmongkol, Mali Okada, Ines Lains, Ana Rita Santos, Paradee Kunavisarut, Anna Sala-Puigdollers, Jay Chhablani, Malgorzata Ozimek, Assaf Hilely, Jan Darius Unterlauft, Anat Loewenstein, Matias Iglicki, Matus Rehak
ACTA DIABETOLOGICA
(2019)
Article
Endocrinology & Metabolism
Catharina Busch, Samantha Fraser-Bell, Matias Iglicki, Marco Lupidi, Aude Couturier, Voraporn Chaikitmongkol, Ermete Giancipoli, Patricio J. Rodriguez-Valdes, Pierre-Henry Gabrielle, Ines Lains, Ana Rita Santos, Zafer Cebeci, Atchara Am Phornphruet, Valentin Degenhardtu, Jan-Darius Unterlauft, Carlo Cagini, Valerie Mane-Tauty, Giuseppe D'Amico Ricci, Isaac Hindi, Kushal Agrawal, Jay Chhablani, Anat Loewenstein, Dinah Zur, Matus Rehak
ACTA DIABETOLOGICA
(2019)
Article
Ophthalmology
Torcato Santos, Lewis H. Warren, Ana Rita Santos, Ines Pereira Marques, Sophie Kubach, Luis G. Mendes, Luis de Sisternes, Maria H. Madeira, Mary Durbin, Jose G. Cunha-Vaz
Summary: This study used OCTA to analyze retinal capillary closure in eyes of diabetic patients, finding that it can predict the severity of NPDR. A smart combination of different imaging protocols effectively differentiated between mild and moderate-to-severe NPDR.
BRITISH JOURNAL OF OPHTHALMOLOGY
(2022)
Article
Ophthalmology
Conceicao Lobo, Torcato Santos, Ines P. Marques, Maria H. Madeira, Ana Rita Santos, Joao Figueira, Jose Cunha-Vaz
Summary: This study characterizes the prevalence and progression of centre-involving diabetic macular oedema (CI-DMO) in minimal to moderate non-proliferative diabetic retinopathy using optical coherence tomography (OCT) and optical reflectivity ratios (OCT-Leakage) measurements of retinal fluid. The results show that subclinical CI-DMO and CI-DMO occur independently of the severity grading of retinopathy and exhibit a progressive increase in retinal extracellular fluid, which is associated with vision loss.
Article
Ophthalmology
Ines P. Marques, Sonia Ferreira, Torcato Santos, Maria H. Madeira, Ana Rita Santos, Luis Mendes, Conceicao Lobo, Jose Cunha-Vaz
Summary: This study examines the relationship between retinal neurodegenerative changes and vessel closure in individuals with NPDR over a 3-year period. The results show that retinal neurodegenerative changes progress steadily and are directly associated with decreased vessel density, particularly in the deep capillary plexus. These findings suggest a link between retinal neuropathy and microvascular changes in diabetic patients.
Article
Ophthalmology
Luisa Ribeiro, Ines P. Marques, Rita Coimbra, Torcato Santos, Maria H. Madeira, Ana Rita Santos, Patricia Barreto, Conceicao Lobo, Jose Cunha-Vaz
Summary: In the 1-year follow-up period, both phenotype B and C showed progression in retinal neurodegeneration, but phenotype C exhibited more marked disease progression at the microvascular level.
OPHTHALMOLOGY AND THERAPY
(2022)
Article
Parasitology
Helena Costa, Roberto Hartasanchez, Ana Rita Santos, Antonio Camarao, Ligia Cruz, Mariana Nascimento, Lidia Gomes, Luis M. Madeira de Carvalho
Summary: No previous study has been conducted on the parasitofauna of brown bears in the Cantabrian Mountains in Spain. This study aimed to investigate the diversity and prevalence of gastrointestinal parasites in this bear population. The results showed a parasite prevalence of 71% with two identified genera: Dicrocoelium sp. and Trichuris sp. Further research efforts are needed to understand the impact of these parasites on bear health and to develop effective management plans for this emblematic species.
VETERINARY PARASITOLOGY- REGIONAL STUDIES AND REPORTS
(2022)
Meeting Abstract
Ophthalmology
Ines Pereira Marques, Maria Luisa Ribeiro, Sonia Ferreira, Ana Rita Santos, Torcato Santos, Jose G. Cunha-Vaz
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2022)
Meeting Abstract
Ophthalmology
Ana Rita Santos, Torcato Santos, Rita Coimbra, Ines Pais, Claudia Versos, Ines Pereira Marques, Jose G. Cunha-Vaz
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2022)
Meeting Abstract
Ophthalmology
Torcato Santos, Ines Pereira Marques, Maria Luisa Ribeiro, Sonia Ferreira, Ana Rita Santos, Jose G. Cunha-Vaz
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2022)
Meeting Abstract
Ophthalmology
Maria Luisa Ribeiro, Ines Marques, Sonia Ferreira, Ana Rita Santos, Torcato Santos, Jose G. Cunha-Vaz
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2022)
Meeting Abstract
Ophthalmology
Conceicao F. Lobo, Maria Luisa Ribeiro, Ines Marques, Sonia Ferreira, Ana Rita Santos, Torcato Santos, Jose G. Cunha-Vaz
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2022)
Article
Medicine, General & Internal
Ines P. Marques, Sophie Kubach, Torcato Santos, Luis Mendes, Maria H. Madeira, Luis de Sisternes, Diana Tavares, Ana Rita Santos, Warren Lewis, Conceicao Lobo, Mary K. Durbin, Jose Cunha-Vaz
Summary: A three-year observational study on individuals with type 2 diabetes found a correlation between retinal vessel closure and the severity progression of diabetic retinopathy. The study showed that retinal vessel density was significantly associated with worsening retinopathy, indicating that OCTA metrics of vessel closure may be used as a surrogate for diabetic retinopathy severity progression. However, no clear correlation was found between neurodegenerative changes and retinopathy progression.
JOURNAL OF CLINICAL MEDICINE
(2021)