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Standard method design considerations for semi-quantification of total naphthenic acids in oil sands

Kevin A. Kovalchik, Matthew S. MacLennan, Kerry M. Peru, John V. Headley, David D.Y. Chen

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 3,   Pages 497-507 doi: 10.1007/s11705-017-1652-0

Abstract: Naphthenic acids are a complex class of thousands of naturally occurring aliphatic and alicyclic carboxylicacids found in oil sands bitumen and in the wastewater generated from bitumen processing.Dozens of analytical methods have been developed for the semi-quantification of total naphthenic acidsA review of important methodological features for analyzing total naphthenic acids is presented and informsthe design of future standard methods for the semi-quantification of total naphthenic acids using mass

Keywords： total naphthenic acids     environmental samples     oil sands process affected water     polar organics     mass spectrometry    

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Bile acids and their effects on diabetes

Cynthia Rajani, Wei Jia

Frontiers of Medicine 2018, Volume 12, Issue 6,   Pages 608-623 doi: 10.1007/s11684-018-0644-x

Abstract: Diabetes is a widespread, rapidly increasing metabolic disease that is driven by hyperglycemia. Early glycemic control is of primary importance to avoid vascular complications including development of retinal disorders leading to blindness, end-stage renal disease, and accelerated atherosclerosis with a higher risk of myocardial infarction, stroke and limb amputations. Even after hyperglycemia has been brought under control, “metabolic memory,” a cluster of irreversible metabolic changes that allow diabetes to progress, may persist depending on the duration of hyperglycemia. Manipulation of bile acid (BA) receptors and the BA pool have been shown to be useful in establishing glycemic control in diabetes due to their ability to regulate energy metabolism by binding and activating nuclear transcription factors such as farnesoid X receptor (FXR) in liver and intestine as well as the G-protein coupled receptor, TGR5, in enteroendocrine cells and pancreatic -cells. The downstream targets of BA activated FXR, FGF15/21, are also important for glucose/insulin homeostasis. In this review we will discuss the effect of BAs on glucose and lipid metabolism and explore recent research on establishing glycemic control in diabetes through the manipulation of BAs and their receptors in the liver, intestine and pancreas, alteration of the enterohepatic circulation, bariatric surgery and alignment of circadian rhythms.

Keywords： bile acids     metabolic memory     diabetes     circadian rhythm     bariatric surgery    

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Catalytic conversion of biomass-derived compounds to various amino acids: status and perspectives

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 7,   Pages 817-829 doi: 10.1007/s11705-022-2254-z

Abstract: Amino acids are important nitrogen-containing chemicals that have a variety of applications.Currently, fermentation is the widely employed method to produce amino acids; however, the products aremostly limited to natural amino acids in the L-configuration.Catalytic synthesis is an alternative approach for the synthesis of amino acids with different typesand α-hydroxyl acids, have been transformed into amino acids via the amination reaction in the

Keywords： biomass     amino acids     chitin     nitrogen-containing compounds     lignocellulose    

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Anaerobic digestion of sludge by different pretreatments: Changes of amino acids and microbial community

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 2, doi: 10.1007/s11783-021-1458-7

Abstract:

•Tryptophan protein, and aromatic protein I/II were the key identified proteins.

Keywords： Sludge pretreatments     Dissolved organic nitrogen     Proteins     Amino acids     Structural equation model     Metagenomic    

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Characterization of soil low-molecular-weight organic acids in the Karst rocky desertification region

Xiaoliang LI, Xiaomin CHEN, Xia LIU, Lianchuan ZHOU, Xinqiang YANG

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 2,   Pages 195-203 doi: 10.1007/s11783-012-0391-1

Abstract: Soil low-molecular-weight (LMW) organic acids play important roles in the soil-forming process and theIn this study, we quantified the contents of LMW organic acids (including lactate, acetate, formate,The concentration of total LMW organic acids in topsoil solution ranged from 0.358 to 1.823 μmol·g ,The concentrations of the LMW organic acids were significantly positive correlated each other.Significant positive correlations were also observed among individual LMW organic acids in soil solution

Keywords： Karst rocky desertification     low-molecular-weight (LMW) organic acids     distribution characteristics     soil    

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Optimization of pretreatment of Jatropha oil with high free fatty acids for biodiesel production

Supriyono SUWITO, Giuliano DRAGONE, Hary SULISTYO, Bardi MURACHMAN, Suryo PURWONO, José TEIXEIRA

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 2,   Pages 210-215 doi: 10.1007/s11705-012-1282-5

Abstract: A central composite rotatable design and response surface methodology were used in order to investigate the individual and combined effects of the ethanol-to-oil ratio, H SO concentration, temperature and time of reaction on the reduction of free fatty acid (FFA) in jatropha oil. A quadratic polynomial model relating the reaction variables with FFA reduction was developed, presenting a good coefficient of determination ( = 0.893). For reducing FFA to less than 1%, the optimal combination was found to be 0.62 v·v ethanol-to-oil ratio (14.9 v·v ethanol-to-FFA ratio), 1.7% v·v H SO concentration, and 79 min reaction time at a reaction temperature of 54°C. These results are of great relevance to maximize methyl esters formation by transesterification using an alkaline catalyst.

Keywords： biodiesel     biofuel     esterification     free fatty acids     jatropha curcas oil    

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Mild and highly regioselective synthesis of biaryl acids via Rh(I)-catalyzed cross-dehydrogenative couplingof benzoic acids using sodium chlorite as oxidant

Yun Liu, Youquan Zhu, Chaojun Li

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 1,   Pages 3-8 doi: 10.1007/s11705-017-1693-4

Abstract: A mild and efficient synthesis for the biaryl acids via rhodium-catalyzed cross-dehydrogenative coupling

Keywords： biaryl acids     cross-dehydrogenative coupling     rhodium-catalyzed    

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Variation in humic and fulvic acids during thermal sludge treatment assessed by size fractionation, elementary

Yuning YANG,Huan LI,Jinyi LI

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 6,   Pages 854-862 doi: 10.1007/s11783-014-0755-9

Abstract: analyze the variation in humic substances during thermal sludge treatment, sludge humic and fulvic acidsThe results showed that the total contents of humic and fulvic acids in the sludge almost remained constantMoreover, both humic and fulvic acids were partly decomposed and 32% of humic acids were converted tofulvic acids.acids decreased from 15 to 2 kDa.

Keywords： sludge     thermal treatment     humic acids     fulvic acids    

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Effects of organic acids on Cd adsorption and desorption by two anthropic soils

Jingui WANG, Jialong LV, Yaolong FU

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 1,   Pages 19-30 doi: 10.1007/s11783-012-0424-9

Abstract: However, different concentrations of organic acids showed various influences on the two soils.Although the types of organic acids and soil properties were different, the effects of the organic acidsIn contrast, the desorption percentage of Cd increased with increasing concentrations of organic acids

Keywords： adsorption     desorption     cadmium     organic acids     temperature     anthropic soil    

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Insights into the changes of amino acids, microbial community, and enzymatic activities related with

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 3, doi: 10.1007/s11783-023-1635-y

Abstract:

● The highest seed germination index was achieved at 0.3 g/g total

Keywords： Composting     Food waste     Amino acids     Microbial community     Enzymatic activity     Nutrient quality    

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Perfluorocarboxylic acids (PFCAs) and perfluoroalkyl sulfonates (PFASs) in surface and tap water around

Yong QIU, He JING, Hanchang SHI,

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 3,   Pages 301-310 doi: 10.1007/s11783-010-0236-8

Abstract: Perfluorinated compounds (PFCs) are ubiquitously distributed in the environment mainly as perfluoro-carboxylic acids

Keywords： surface and tap water     perfluorocarboxylic acids (PFCAs)     perfluoroalkyl sulfonates (PFASs)     Lake Taihu    

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Simultaneous removal of total oxidizable carbon, phosphate and various metallic ions from HO solution

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 4,   Pages 470-482 doi: 10.1007/s11705-022-2231-6

Abstract: Accordingly, the removal efficiency of total oxidizable carbon, phosphate and metallic ions from theThe removal efficiency of 82.7% for total oxidizable carbon, 34.2% for phosphate, 87.1% for Fe3+, 83.2% for Al3+, 55.1% for Ca2+ and 66.6% for Mg2+, with a total

Keywords： adsorption     zirconia     total oxidizable carbon     phosphate     metallic ions     hydrogen peroxide    

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Implementation of total Lagrangian formulation for the elasto-plastic analysis of plane steel frames

Bing XIA, Yuching WU, Zhanfei HUANG

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 3,   Pages 257-266 doi: 10.1007/s11709-012-0163-9

Abstract: In this paper, the co-rotational total Lagrangian forms of finite element formulations are derived to

Keywords： co-rotational     total Lagrangian     geometrical nonlinearity     fire     elasto-plastic    

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Exergy and exergoeconomic analyses for integration of aromatics separation with aromatics upgrading

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 2,   Pages 183-193 doi: 10.1007/s11705-022-2192-9

Abstract: The process generates lower total exergy destruction when the splitting ratio of toluene varies betweenNevertheless, the process presents lower total product unit cost with the splitting ratio of tolueneBesides, it is found that distillation is the biggest contributor to the total exergy destruction, accounting

Keywords： aromatics separation and upgrading     variant splitting ratios     total exergy destruction     total product    

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Critical flow-storm approach to total maximum daily load (TMDL) development: an analytical conceptual

Zhang Harry, Yu Shaw

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 3,   Pages 267-273 doi: 10.1007/s11783-008-0058-0

Abstract: One of the key challenges in the total maximum daily load (TMDL) development process is how to define

Keywords： representative hydrologic     occurrence     simulation approach     scarcity     alternative    

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Title Author Date Type Operation

Standard method design considerations for semi-quantification of total naphthenic acids in oil sands

Kevin A. Kovalchik, Matthew S. MacLennan, Kerry M. Peru, John V. Headley, David D.Y. Chen

Journal Article

Bile acids and their effects on diabetes

Cynthia Rajani, Wei Jia

Journal Article

Catalytic conversion of biomass-derived compounds to various amino acids: status and perspectives

Journal Article

Anaerobic digestion of sludge by different pretreatments: Changes of amino acids and microbial community

Journal Article

Characterization of soil low-molecular-weight organic acids in the Karst rocky desertification region

Xiaoliang LI, Xiaomin CHEN, Xia LIU, Lianchuan ZHOU, Xinqiang YANG

Journal Article

Optimization of pretreatment of Jatropha oil with high free fatty acids for biodiesel production

Supriyono SUWITO, Giuliano DRAGONE, Hary SULISTYO, Bardi MURACHMAN, Suryo PURWONO, José TEIXEIRA

Journal Article

Mild and highly regioselective synthesis of biaryl acids via Rh(I)-catalyzed cross-dehydrogenative couplingof benzoic acids using sodium chlorite as oxidant

Yun Liu, Youquan Zhu, Chaojun Li

Journal Article

Variation in humic and fulvic acids during thermal sludge treatment assessed by size fractionation, elementary

Yuning YANG,Huan LI,Jinyi LI

Journal Article

Effects of organic acids on Cd adsorption and desorption by two anthropic soils

Jingui WANG, Jialong LV, Yaolong FU

Journal Article

Insights into the changes of amino acids, microbial community, and enzymatic activities related with

Journal Article

Perfluorocarboxylic acids (PFCAs) and perfluoroalkyl sulfonates (PFASs) in surface and tap water around

Yong QIU, He JING, Hanchang SHI,

Journal Article

Simultaneous removal of total oxidizable carbon, phosphate and various metallic ions from HO solution

Journal Article

Implementation of total Lagrangian formulation for the elasto-plastic analysis of plane steel frames

Bing XIA, Yuching WU, Zhanfei HUANG

Journal Article

Exergy and exergoeconomic analyses for integration of aromatics separation with aromatics upgrading

Journal Article

Critical flow-storm approach to total maximum daily load (TMDL) development: an analytical conceptual

Zhang Harry, Yu Shaw

Journal Article