Results 91 to 100 of about 26,772 (253)

A Tert‐Alkyl Terephthalate Derivative as a Universal Degradable Unit for Condensation Polymers

Angewandte Chemie, EarlyView.
A sterically bulky dicarboxylic acid core bearing a tertiary alkyl ester enables photocatalytic C─O bond cleavage via generation of a stabilized tertiary alkyl radical. Incorporated into polyarylate, polyurethane, and polyester, this universal trigger facilitates efficient degradation under identical conditions (up to 99% within 2–4 h). Remarkably, the
Yasuyuki Nitta, Ryosuke Nishikuma, Souya Kouda, Masatoshi Ohyama, Meiki Shinoda, Tsuyoshi Taniguchi, Takashi Koike, Takashi Nishikata   +7 more
wiley   +1 more source

Esterificación quimioselectiva de fitosteroles de madera mediante lipasas Chemoselective transesterification of wood steroles by lipases

Revista Colombiana de Biotecnología, 2008
La esterificación selectiva de fitosteroles de madera representa una aplicación novedosa de las lipasas, que se inscribe dentro de una plataforma tecnológica de valoración del licor negro en el proceso Kraft.
Álvaro Gregorio, Álvarez Lorena, Illanes Andrés   +2 more
doaj  

A KINETIC STUDY OF ESTERIFICATION OF NAPHTHENIC ACIDS FROM A COLOMBIAN HEAVY CRUDE OIL

CT&F Ciencia, Tecnología & Futuro, 2012
This article presents the kinetic study of the esterification reaction of naphthenic acids from a Colombian heavy crude oil, with a Total Acid Number (TAN) of 7,33 mgKOH/g, in a batch type reactor.
Haydée Quiroga-Becerra, Carlos Mejía-Miranda, Dionisio Laverde-Cataño, Marian Hernández-López, Mauricio Gómez-Sánchez   +4 more
doaj  

Chemical and instrumental characterization of pectin from dried pomace of eleven apple cultivars = Caracterização química e instrumental de pectinas isoladas de bagaço de 11 cultivares de maçã

Acta Scientiarum. Agronomy, 2011
Pectic substances from eleven samples of dried apple pomace were extracted using an acid procedure (100 mM HNO3, 10 min., 80ºC), dried, ground and stored in a P2O5 atmosphere.
Dayana Carla Rigoni, Mariana de Fátima Sato, Maria Helene Giovanetti Canteri, Carmen Lúcia de Oliveira Petkowicz, Alessandro Nogueira, Gilvan Wosiacki   +5 more
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Adenylosuccinate Synthase 1 Deficiency Improves Energy Metabolism by Promoting Adipose Tissue Re‐esterification via Glycerol Kinase Upregulation

Advanced Science
Purine metabolism enzymes have a well‐established role in maintaining the nucleotide pool, thereby sustaining cellular energy homeostasis. Although reduced purine nucleotide concentrations have been reported can influence uncoupling protein 1 (UCP1 ...
Jingjing Sun, Miriayi Alimujiang, Wenfei Li, Shuqin Chen, Yingying Su, Tingting Hu, Xuhong Lu, Yafen Ye, Ningning Bai, Fan Hu, Xiaoya Li, Rongrong Xu, Jun Xu, Jiarui Zhao, Yan Lu, Xiaojing Ma, Ying Yang   +16 more
doaj   +1 more source

Stabilization of PUFA‐Rich Mayonnaise Against Lipid Oxidation: A Review of the Last Three Decades of Research

Journal of the American Oil Chemists' Society, EarlyView.
ABSTRACT Mayonnaise, a widely consumed oil‐in‐water emulsion, is highly susceptible to lipid oxidation due to its high content of polyunsaturated fatty acids (PUFAs) and the presence of pro‐oxidant factors such as low pH and iron from egg yolk. Over the past three decades, extensive research has focused on understanding oxidation mechanisms, analytical
Sakhi Ghelichi, Betül Yesiltas, Charlotte Jacobsen   +2 more
wiley   +1 more source

The Use of Papaya Exudates for Fatty Acid Xilitol Synthesis

Jurnal Teknologi dan Industri Pangan, 2010
Fatty acid xylitol-ester (FAXILE) are xylitol esters of fatty acids with one to five DE (degree of esterification) value. FAXILE with DE value of 3 or higher can be used as low calorie fat replacer since they have low digestive property; while the ...
. Suhardi
doaj  

Revisiting Securidaca longipedunculata Seed Oil: Applying NMR and Mass Spectroscopy to Confirm the Presence of 2‐Acetyl‐1,3‐Diacyl–sn‐Glycerols and Conjugated Hydroxydienoic Fatty Acids

Journal of the American Oil Chemists' Society, EarlyView.
The manuscript confirms and expands on previous reports concerning the presence of unusual conjugated hydroxydienoic fatty acids and acetyl‐TAG in the seed oil of Securidaca longipedunculata. The location of acetate only at sn‐2 of TAG was conclusively shown by high resolution NMR and hydroxy seed fatty acids are characterized.
Mark A. Smith, Jianfeng Zhu, Jin‐Yue Sun   +2 more
wiley   +1 more source

Alkali‐Catalyzed Synthesis of Acylglycerol Estolides Exclusively from Castor Oil

Journal of the American Oil Chemists' Society, EarlyView.
This work advances sustainable chemistry by converting renewable castor oil into high‐performance estolides via solvent‐free, low‐energy catalysis. ABSTRACT Estolides are oligomers composed of fatty acid (FA) monomers linked through secondary ester bonds located along the mid‐chain region.
Lucas Natã de Melo, Simoni Margareti Plentz Meneghetti, Mario Roberto Meneghetti, Janaína Heberle Bortoluzzi   +3 more
wiley   +1 more source

PENGGUNAAN GETAH PEPAYA DALAM SINTESIS ESTER XILITOL ASAM LEMAK (EXAL) [The Use of Papaya Exudates for Fatty Acid Xilitol Synthesis]

Jurnal Teknologi dan Industri Pangan, 2003
Fatty acid xylitol-ester (FAXILE) are xylitol esters of fatty acids with one to five DE (degree of esterification) value. FAXILE with DE value of 3 or higher can be used as low calorie fat replacer since they have low digestive property; while the ...
Suhardi
doaj