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Your search keyword '"Freire, Denise M. G."' showing total 257 results
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257 results on '"Freire, Denise M. G."'

1. Enzymatic Biodiesel Production

Author

Aguieiras, Erika C. G., primary, Cipolatti, Eliane P., additional, Pinto, Martina C. C., additional, Duarte, Jaqueline G., additional, Manoel, Evelin Andrade, additional, and Freire, Denise M. G., additional

Published
2021
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8. Immobilization of Yarrowia lipolytica Lipase—A Comparison of Stability of Physical Adsorption and Covalent Attachment Techniques

Author

Cunha, Aline G., Fernández-Lorente, Gloria, Bevilaqua, Juliana V., Destain, Jacqueline, Paiva, Lúcia M. C., Freire, Denise M. G., Fernández-Lafuente, Roberto, Guisán, Jose M., Mulchandani, Ashok, editor, Aizawa, M., editor, Arnold, M. A., editor, Bachas, L., editor, Bachmann, T. T., editor, Belkin, S., editor, Blanch, Harvey W., editor, Cha, H. J., editor, Chuan-Ling, Q., editor, Da Silva, Nancy A., editor, DeLisa, M., editor, Deshusses, M., editor, Dordick, J. S., editor, Eldefrawi, M. E., editor, Gu, M. B., editor, Jain, R. K., editor, Karanth, N. G., editor, Kelly, R., editor, Klibanov, A. M., editor, Krull, U. J., editor, Ladish, M. R., editor, Lee, K., editor, Lee, Y. Y., editor, Ligler, F. S., editor, Linhardt, R., editor, Pandey, A., editor, Pishko, M., editor, Renugopalakrishnan, V., editor, Ryu, D., editor, Seibert, M., editor, Tan, W., editor, Ueda, Mitsuyoshi, editor, Varfolomeyev, S. D., editor, Xu, J. -H., editor, Wang, P., editor, Wyman, C. E., editor, Zhao, H., editor, Chen, Wilfred, editor, Csoregi, Elisabeth, editor, Murhammer, David W., editor, Singh, Anup K., editor, Mulchandaui, Priti, editor, Adney, William S., editor, McMillan, James D., editor, Mielenz, Jonathan, editor, and Klasson, K. Thomas, editor

Published
2008
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24. Development of a green integrated process for biodiesel esters production: Use of fermented macaúba cake as biocatalyst for macaúba acid oil transesterification

Author

Ávila, Sabrini N. S., primary, Collaço, Ana Cristina A., additional, Greco‐Duarte, Jaqueline, additional, Aguieiras, Erika C. G., additional, Ambrósio, Priscila R. S., additional, Castro, Aline M., additional, Gutarra, Melissa L. E., additional, Cavalcanti, Elisa D. C., additional, and Freire, Denise M. G., additional

Published
2021
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36. Aqueous Extracts of the Castor Beans as a Corrosion Inhibitor of Mild Steel in HCl Media

Author

Santana,Carolina A., Cunha,Jéssica N. da, Rodrigues,José G. A., Greco-Duarte,Jaqueline, Freire,Denise M. G., and D’Elia,Eliane

Subjects
corrosion inhibitor, natural products, castor beans, mild steel
Abstract

The present work studied aqueous extracts of castor beans as a natural inhibitor of the corrosion of mild steel in 1 M HCl using gravimetric tests, potentiodynamic polarization curves, linear polarization method, electrochemical impedance measurements, surface analysis by scanning electron microscopy (SEM) and chemical characterization by Fourier transform infrared spectroscopy (FTIR). Gravimetric tests showed that inhibition efficiency (IE) increased with immersion time and concentration of the extract, reaching 97.8% in the presence of 800 mg L−1 inhibitor after 24 h immersion time. For the gravimetric tests varying the temperature, a decrease of the activation energy (Ea) was observed, suggesting chemical adsorption of extract components on the metal surface. The extracts from the castor beans acted as a good corrosion inhibitor, and the macromolecules present in the high molecular weight fraction (HMWF) have a fundamental participation in this process since it presented 93.7% of IE for 200 mg L−1.

Published
2020

40. Synthesis of Porous Polymeric Supports with PolyHIPE Structures Based on Styrene‐Divinylbenzene Copolymers

Author

Torquato, Ezaine C. C., primary, Brito, Ana P. N., additional, Trovão, Roberta S., additional, Oliveira, Mirian A., additional, Smith, Nathália S., additional, Pinto, Martina C. C., additional, Pinto, José Carlos, additional, Cipolatti, Eliane P., additional, Freire, Denise M. G., additional, Marques, Mônica R. C., additional, and Costa, Luciana C., additional

Published
2020
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47. FORMULATION AND CHARACTERIZATION OF ULTRASOUND-ASSISTED NANOEMULSIONS CONTAINING PALM OIL (Elaeis guineensis Jacq) IN WATER

Author

Prá, Valéria Dal, primary, Pires, Fernanda B., additional, Dolwitsch, Carolina B., additional, Lazzaretti Jr., Ayres P., additional, Roggia, Isabel, additional, Mortari, Sérgio R., additional, Freire, Denise M. G., additional, Souza, Homero, additional, Mazutti, Marcio A., additional, and Rosa, Marcelo B. da, additional

Published
2019
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49. Technological development of the bio‐based 2,3‐butanediol process.

Author

Tinôco, Daniel, Borschiver, Suzana, Coutinho, Paulo L., and Freire, Denise M. G.

Subjects
BUTANEDIOL, FOOD additives, SOLVENT extraction, MANUFACTURING processes, CHEMICAL industry, PLASTICS
Abstract

The biotechnological production of 2,3‐butanediol (2,3‐BDO) has economic and environmental advantages over the chemical route, although its large‐scale implementation has not yet been consolidated. To establish the technological maturity of the bio‐based 2,3‐BDO process, and the factors limiting its industrial use, a technology roadmap was built from patents and scientific articles, in which four drivers were identified: production process, recovery process, product, and application. The production process driver was reported in 53.25% of documents, notably including studies on substrates, engineered microorganisms, efficient production methods, and nutritional supplementation. The recovery process driver was investigated in 23.5% of studies, with conventional distillation and solvent extraction being the main technologies performed on a large scale. Product and application drivers accounted for 9.25% and 14% of studies, respectively, highlighting the chemical intermediates, plastics, food additives, and cosmetics market segments. A limited number of companies like LanzaTech and GS Caltex Corporation already produce industrially bio‐based 2,3‐BDO, while academic centers such as the Yancheng Institute of Technology are focused to the laboratory scale with technologies to be implemented in the long term. This study can therefore help to establish and gain an understanding of the necessary strategies to consolidate the industrial production of bio‐based 2,3‐BDO in the future. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd [ABSTRACT FROM AUTHOR]

Published
2021
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50. Valorisation of sugarcane molasses for the production of microbial lipids via fermentation of two Rhodosporidium strains for enzymatic synthesis of polyol esters.

Author

Boviatsi, Efthymia, Papadaki, Aikaterini, Efthymiou, Maria‐Nefeli, Nychas, George‐John E, Papanikolaou, Seraphim, Silva, José A C, Freire, Denise M G, and Koutinas, Apostolis

Subjects
MICROBIAL lipids, POLYOLS, FATTY acid esters, SUGARCANE, ESTERS, MOLASSES
Abstract

BACKGROUND Bioprocess development for microbial oil production using cane sugar and sugarcane molasses via fermentation followed by enzymatic conversion into fatty acid esters is presented in this study. RESULTS: Microbial oil was initially evaluated in shake flask fermentations of Rhodosporidium toruloides NRRL Y‐27012 and R. kratochvilovae Y‐43 using either very high polarity (VHP) cane sugar or sugarcane molasses. Supplementation of phosphate salts, trace elements and nitrogen sources in molasses‐based cultures influenced yeast growth and microbial oil production. R. kratochvilovae had different nutrient requirements than R. toruloides. Fed‐batch bioreactor cultures of R. toruloides in molasses‐based cultures without any phosphate salts and trace element supplementation led to a microbial oil concentration of 25 g L−1 and an intracellular lipid content of 61% (w/w). Nutrient supplementation influenced the fatty acid composition of microbial oils indicating that enrichment in oleic acid could be achieved (up to 65.1%). The microbial oil produced by R. toruloides was enzymatically converted into polyol esters with a conversion yield of more than 85% (w/w). CONCLUSION: This study demonstrates that Rhodosporidium sp. can be cultivated in molasses for the production of oleic acid enriched microbial lipids by adjusting medium composition. The polyol esters derived from microbial lipids could be used as a renewable feedstock for oleochemical production. © 2019 Society of Chemical Industry [ABSTRACT FROM AUTHOR]

Published
2020
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