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acetaldehyde, etc ; acrolein; emissions factor; formaldehyde; high performance liquid chromatography; smog pollution; tillage; China; Show all 8 Subjects
Abstract:
... Emissions of carbonyl compounds from agricultural machines cannot be ignored. Carbonyl compounds can cause the formation of ozone (O₃) and secondary organic aerosols, which can cause photochemical smog to form. In this study, 20 agricultural machines were tested using portable emission measurement system (PEMS) under real-world tillage processes. The exhaust gases were sampled using 2,4-dinitrophe ...
acetaldehyde, etc ; catalysts; catalytic activity; ethanol; feedstocks; kinetics; temperature; Show all 7 Subjects
Abstract:
... This paper studies key issues for the design of industrial ethanol to 1,3-butadiene two-step processes, focusing on the second catalytic reaction step, for which a Ta-SBA-15 catalyst was chosen as a representative of the new generation of two-step catalysts. The important practical aspects studied were: i) the effect of operating conditions and the presence of impurities (water) in the ethanol fee ...
acetaldehyde, etc ; depolymerization; liquids; polyethylene terephthalates; solvents; toxicity; wastes; Show all 7 Subjects
Abstract:
... Accumulation of plastic waste is harming eco-systems and it is time to move towards a circular plastic economy. Sustainable production and recycling processes for plastics are challenged mostly by the lack of renewable building blocks. This study investigates hydrothermal processing (HTP) as a platform for depolymerization of two commonly used plastic polymers. Subcritical water (300 °C; 10 MPa) w ...
acetaldehyde, etc ; capillary gas chromatography; food chemistry; heterocyclic compounds; mushrooms; odors; olfactometry; stereoisomers; Show all 8 Subjects
Abstract:
... The heterocyclic compounds 2,6-dimethyl-4-propyl-1,3-oxathiane 1 and 2,4-dimethyl-6-propyl-1,3-oxathiane 2 were obtained by condensing 4-mercapto-2-heptanol and 2-mercapto-4-heptanol, respectively, with acetaldehyde. For both, separation of the eight stereoisomers was achieved via capillary gas chromatography using heptakis(diethyl-tert-butyldimethylsilyl)-β-cyclodextrin as the chiral stationary p ...
acetaldehyde, etc ; agriculture; anthocyanins; hypoxia; oxidation; oxygen consumption; phenylacetaldehyde; polyphenols; shelf life; temperature; winemaking; Show all 11 Subjects
Abstract:
... BACKGROUND: The accumulation of acetaldehyde and Strecker aldehydes during wine oxidation is detrimental to quality and often determines wine shelf‐life. Knowing in advance the specific tendency of a wine to accumulate these compounds would help decision making during winemaking. An accelerated test based on a forced oxidation procedure at 45 °C (5 days) to measure aldehyde accumulation rates (AAR ...
acetaldehyde, etc ; bioreactors; carbon dioxide; drug therapy; electrodes; ethanol; green chemistry; health services; industry; Show all 9 Subjects
Abstract:
... The healthcare industry emits significant amounts of CO₂ and has an imperative need for decarbonization. This study demonstrated a new hybrid electro-enzymatic process that converts waste CO₂ into high-value C6 pharmaceutical precursor compounds. A novel three-chamber electrolyzer equipped with a Cu-based gas diffusion electrode converted gaseous CO₂ into ethanol at a high current density (40–60 m ...
acetaldehyde, etc ; Lewis acids; catalytic activity; ethanol; porosity; porous media; process design; surfactants; zeolites; Show all 9 Subjects
Abstract:
... The hierarchical porosity of zeolite is a key factor affecting its catalytic activity and stability for bulky molecules involved reactions. However, it is still challenging to introduce mesoporosity into heteroatom-incorporated zeolites in a facile manner while maintaining the catalytic activity. In this work, a strategy for mesoporosity development in incorporated zeolites based on two templates ...
Benjamin Bayer; Andreas Maccani; Johanna Jahn; Mark Duerkop; Ewald Kapeller; Robert Pletzenauer; Barbara Kraus; Gerald Striedner; Juan A. Hernandez Bort
acetaldehyde, etc ; Dependoparvovirus; biotechnology; capacitance; cell culture; gene therapy; glucose; mass spectrometry; process control; transfection; Show all 10 Subjects
Abstract:
... OBJECTIVES: The applicability of proton-transfer-reaction mass spectrometry (PTR-MS) as a versatile online monitoring tool to increase consistency and robustness for recombinant adeno-associated virus (rAAV) producing HEK 293 bioprocesses was evaluated. We present a structured workflow to extract process relevant information from PTR-MS data. RESULTS: Reproducibility of volatile organic compound ( ...
acetaldehyde, etc ; carbon; carbon dioxide; carbon monoxide; homolytic cleavage; molecular dynamics; polylactic acid; thermal degradation; Show all 8 Subjects
Abstract:
... The reactive force field molecular dynamics (ReaxFF-MD) simulations were performed on polylactic acid (PLA) for the first time to understand its thermal and thermo-oxidative degradation mechanisms. The main degradation products of PLA observed in actual experiments were well reproduced by ReaxFF-MD simulations. The results showed that the initial thermal degradation pathway for the PLA was the hom ...
acetaldehyde, etc ; Acinetobacter; benzaldehyde; benzene; cold; lipid peroxidation; nonthermal processing; odors; shelf life; total volatile basic nitrogen; Show all 10 Subjects
Abstract:
... This study was to evaluate the cold plasma treated times (0, 3, 6, and 9 min) combining with Ar-based MAP on the microbiological shelflife and quality attributes in meatballs. Results showed that Ar-6 min and Ar-9 min groups could significantly decrease the initial counts of microorganism by 1.02 and 1.19 log CFU/g in meatballs, respectively, besides the shelf-life was prolonged for 14 days. Compa ...
... BACKGROUND AND AIMS: Microoxygenation (MOX) is widely used in winemaking. Its impact, however, on Pinot Noir wines has not been well documented. We investigated the influence of MOX on colour parameters and on the anthocyanin and polymeric pigment concentration of a young Pinot Noir wine. The relationship between MOX, yeast growth and acetaldehyde production was also explored. METHODS AND RESULTS: ...
... A CRISPR/Cas9 system with gene editing efficiency of 100% in the industrial diploid Saccharomyces cerevisiae CWY-132 strain for 2-phenylethanol (2-PE) production was constructed. The effect of deletion of acetyltransferase gene ATF1 in the Ehrlich pathway on 2-PE synthesis was studied for the first time in S. cerevisiae. Laboratory and industrial strains were compared for the deletion effect of AT ...
... Cooking fumes are an important source of volatile organic compounds (VOCs), particulate matter (PM), and carbonyl compounds. The additive is wildly applied in grilling meat for flavor improvement. However, the effects of additives on cooking fumes emissions, such as volatile organic compounds (VOCs), particulate matter (PM), and carbonyl compounds, in meat grilling have not been studied. The impac ...
Sujan Shrestha; Subin Yoon; Matthew H. Erickson; Fangzhou Guo; Manisha Mehra; Alexander A.T. Bui; Benjamin C. Schulze; Alexander Kotsakis; Conner Daube; Scott C. Herndon; Tara I. Yacovitch; Sergio Alvarez; James H. Flynn; Robert J. Griffin; George P. Cobb; Sascha Usenko; Rebecca J. Sheesley
acetaldehyde, etc ; acetone; air quality; environment; ethane; industry; isoprene; methane; metropolitan areas; oils; photooxidation; pollution; traffic; vegetation; Texas; Show all 15 Subjects
Abstract:
... The population of Texas has increased rapidly in the past decade. The San Antonio Field Study (SAFS) was designed to investigate ozone (O₃) production and precursors in this rapidly changing, sprawling metropolitan area. There are still many questions regarding the sources and chemistry of volatile organic compounds (VOCs) in urban areas like San Antonio which are affected by a complex mixture of ...
acetaldehyde, etc ; antioxidant activity; beers; byproducts; fermentation; food chemistry; gallic acid; grape pomace; wastes; white wines; wine industry; winemaking; Show all 12 Subjects
Abstract:
... Main by-product of white wine production is white grape pomace (WGP). It has attracted attention of food scientists, because it possesses high concentration of nutrients and bioactive substances. In this study, WGP was added to the beer after primary fermentation in two different concentrations (10% w/w and 20% w/w) and two different pretreatments (pasteurised and unpasteurised) to determine, whet ...
... This study was aimed to determine the changes in kefir samples (CK and GK) made from cow’s and goat’s milk during frozen storage. The CK and GK samples were first stored at +4 °C for 14 and 21 days. Thereafter, all the samples were frozen at –35 °C for 24 h and kept at –18 °C for 45 days. There was no significant change in the fat, protein, acidity and pH values in both samples during the storage. ...
... Biobutanol is naturally produced by solventogenic clostridia during acetone-butanol-ethanol (ABE) fermentation, which is hampered by low butanol titer, yield and productivity. Here, Clostridium acetobutylicum ATCC 55025 and its robust mutant HKKO with histidine kinase genes cac3319/cac0323 knockout were metabolically engineered to eliminate acetone formation and improve butanol production. By knoc ...
acetaldehyde, etc ; acetone; acrolein; air; air quality; environmental hazards; hazard characterization; human health; humans; inhalation exposure; risk; tomatoes; China; Show all 13 Subjects
Abstract:
... Aldehyde and ketone compounds are ubiquitous in the air and prone to adverse effects on human health. Cooking emission is one of the major indoor sources. Aiming to evaluate health risks associated with inhalation exposure to aldehyde and ketone compounds, 13 carbonyl compounds (CCs) released from heating 5 edible oils, 3 seasonings, and 2 dishes were investigated in a kitchen laboratory. For the ...
... Tree stems have been identified as sources of volatile organic compounds (VOCs) that play important roles in tree defence and atmospheric chemistry. Yet, we lack understanding on the magnitude and environmental drivers of stem VOC emissions in various forest ecosystems. Due to the increasing importance of extreme drought, we studied drought effects on the VOC emissions from mature Scots pine (Pinu ...
... Saccharomyces cerevisiae is increasingly being used for the production of chemicals derived from acetyl coenzyme A (acetyl-CoA). However, the inadequate supply of cytosolic acetyl-CoA often leads to low yields. Here, we developed a novel strategy for balancing acetyl-CoA metabolism and increasing the amount of the downstream product. First, the combination of acetaldehyde dehydrogenase (eutE) and ...