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Maleic acid

Rayane Ganassin, Ludmilla Regina de Souza, Karen Rapp Py-Daniel, João Paulo Figueiró Longo, Janaína Moreira Coelho, Mosar Correa Rodrigues, Cheng-Shi Jiang, Jinsong Gu, Paulo César de Morais, Ewa Mosiniewicz-Szablewska, Piotr Suchocki, Sônia Nair Báo, Ricardo Bentes Azevedo, Luis Alexandre Muehlmann
Due to the low therapeutic index of different chemotherapeutic drugs used for cancer treatment, the development of new anticancer drugs remains an intense field of research. A recently developed mixture of selenitetriacylglycerides, selol, was shown to be active against different cancer cells in vitro. As this compound is highly hydrophobic, it was encapsulated, in a previous study, into poly(methyl vinyl ether-co-maleic anhydride)-shelled nanocapsules in order to improve its dispersibility in aqueous media...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Jaleh Varshosaz, Negin Anvari
Acute lymphoblastic leukemia (ALL) is the white blood cell cancer in children. L-asparaginase (L-ASNase) is one of the first drugs used in ALL treatment. Anti-tumor activity of L-ASNase is not specific and indicates limited stability in different biological environments, in addition to its quick clearance from blood. The purpose of the present study was to achieve a new L-ASNase polymer bioconjugate to improve pharmacokinetic, increase half-life and stability of the enzyme. The conjugations were achieved by the cross-linking agent of 1-ethyl-3-(3- dimethylaminopropyl) carbodiimide (EDC) which activates the carboxylic acid groups of polymeric nanoparticles to create amide bond...
June 2018: IET Nanobiotechnology
Shu-Ping Li, Yu-Wen Wang, Sheng-Lan Qi, Yun-Peng Zhang, Gang Deng, Wen-Zheng Ding, Chao Ma, Qi-Yan Lin, Hui-Da Guan, Wei Liu, Xue-Mei Cheng, Chang-Hong Wang
The analogous β-carboline alkaloids, harmaline (HAL) and harmine (HAR), possess a variety of biological properties, including acetylcholinesterase (AChE) inhibitory activity, antioxidant, anti-inflammatory, and many others, and have great potential for treating Alzheimer's disease (AD). However, studies have showed that the two compounds have similar structures and in vitro AChE inhibitory activities but with significant difference in bioavailability. The objective of this study was to comparatively investigate the effects of HAL and HAR in memory deficits of scopolamine-induced mice...
2018: Frontiers in Pharmacology
Sen Yang, Mengxia Hua, Liang Shen, Xiaoli Han, Meiyun Xu, Liangju Kuang, Daoben Hua
It is significant to develop novel materials and techniques for efficient removal of radionuclides from radioactive wastes due to the radioactive and chemical toxicity. In this paper, we report a strategy for broad-spectrum adsorption of radionuclides by multiple groups-decorated adsorbents. Specifically, the adsorbents were prepared by grafting diethyl-(4-vinylbenzyl) phosphonate and maleic anhydride copolymers onto molybdenum disulfide sheets for the sorption of uranium(VI) and europium(III). The sorption efficiencies exhibited a dependency on pH, contact time and initial concentrations...
May 3, 2018: Journal of Hazardous Materials
Kalle Sigfridsson, Matti Ahlqvist, Martin Lindsjö, Stefan Paulsson
The purpose of this study was to investigate if AZD5329, a dual neurokinin NK1/2 receptor antagonist, is a suitable candidate for further development as an oral immediate release (IR) solid dosage form as a final product. The neutral form of AZD5329 has only been isolated as amorphous material. In order to search for a solid material with improved physical and chemical stability and more suitable solid-state properties, a salt screen was performed. Crystalline material of a maleic acid salt and a fumaric acid salt of AZD5329 were obtained...
May 3, 2018: European Journal of Pharmaceutical Sciences
Chang Sun, Samir Benlekbir, Padmaja Venkatakrishnan, Yuhang Wang, Sangjin Hong, Jonathan Hosler, Emad Tajkhorshid, John L Rubinstein, Robert B Gennis
Alternative complex III (ACIII) is a key component of the respiratory and/or photosynthetic electron transport chains of many bacteria1-3 . Like complex III (also known as the bc1 complex), ACIII catalyses the oxidation of membrane-bound quinol and the reduction of cytochrome c or an equivalent electron carrier. However, the two complexes have no structural similarity4-7 . Although ACIII has eluded structural characterization, several of its subunits are known to be homologous to members of the complex iron-sulfur molybdoenzyme (CISM) superfamily 8 , including the proton pump polysulfide reductase9,10 ...
April 25, 2018: Nature
Zhaoxian Wang, Samaresh Sau, Hashem O Alsaab, Arun K Iyer
Triple negative breast cancer (TNBC) is a highly aggressive tumor subtype, lacking estrogen, progesterone and human epidermal growth factor-2 (HER-2) receptors. Thus, early detection and targeted therapy of TNBC is an urgent need. Herein, we have developed a CD44 targeting Hyaluronic Acid (HA) decorated biocompatible oligomer, containing FDA approved vitamin E TPGS and Styrene Maleic Anhydride (SMA) (HA-SMA-TPGS) for targeting TNBC. The self-assembling HA-SMA-TPGS was encapsulated with poorly water soluble, potent curcumin analogue (CDF) to form nanomicelles (NM), HA-SMA-TPGS-CDF has demonstrated excellent nanoparticle characteristics for parenteral delivery...
April 17, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
Haiyan Yu, Yan Zhang, Jie Zhao, Huaixiang Tian
To evaluate the taste characteristics of Chinese bayberry juice, four types of bayberry juice sourced from different origins and varieties were analysed using sensory evaluation, chromatography, spectroscopy analysis and an electronic tongue (E-tongue). Nine organic acids and three sugars were assessed using high performance liquid chromatography. Total polyphenols were measured by spectrophotometry. The overall taste profile was collected using the E-tongue. The four types of bayberry juice differed in the sensory attributes of sour, sweet, bitter, and astringent...
May 2018: Journal of Food Science and Technology
Takashi Hongo, Satoshi Nozaki, Midori Tsuchiya, Mototaka Inaba, Kenji Takahashi, Toshifumi Fujiwara
Case: Contrast medium-induced transient leukopenia is very rare. Here, we report a case of a 73-year-old man diagnosed with contrast media-induced transient leukopenia. The patient underwent abdominal contrast-enhanced computed tomography, where he was given non-ionic iodinated contrast medium i.v. His medical history included an allergic reaction to a different contrast medium. One hour later, the patient was admitted to the emergency department complaining of chest discomfort. He had leukopenia and a fever (temperature of 38...
April 2018: Acute Medicine & Surgery
Juan Domínguez-Robles, María Soledad Peresin, Tarja Tamminen, Alejandro Rodríguez, Eneko Larrañeta, Anna-Stiina Jääskeläinen
Lignin is a complex natural polymer and it is one of the main constituent of the lignocellulosic biomass. Moreover, it is a bio-renewable material and it is available in large amounts as by-product of residues from the wood and paper industries. Lignin-based hydrogels with high swelling capabilities were prepared by crosslinking poly (methyl vinyl ether co‑maleic acid) and different technical lignins in ammonium and sodium hydroxide solutions. The produced hydrogels showed a wide range of water absorption capacities varying from 13 to 130 g of water per 1 g of sample...
April 12, 2018: International Journal of Biological Macromolecules
Yuhuan Yan, Chunhui Zhang, Qixuan Lin, Xiaohui Wang, Banggui Cheng, Huiling Li, Junli Ren
In this study, highly-efficient hydrolysis of bagasse into xylose and arabinose sugars (C5 sugars) was developed by microwave-assisted oxalic acid pretreatment under mild reaction conditions. The effects of acid and hydrolysis conditions on the C5 sugar yields were discussed. The results showed that oxalic acid performed better than hydrochloric acid and maleic acid, and was a promising alternative to sulfuric acid for xylose production at the same acid concentration. The maximum yields of xylose (95.7%) and arabinose (91...
April 10, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Rui Lu, Fang Lu, Xiaoqin Si, Huifang Jiang, Qianqian Huang, Weiqiang Yu, Xiangtao Kong, Jie Xu
Direct transformation of bio-based platform chemicals into aromatic dicarboxylic acids and their derivatives, which are widely used for the manufacture of polymers, is of significant importance for the sustainable development of plastic industry. However, limited successful chemical processes have been achieved. Here, we report a sustainable route for the production of phthalate and its hydrogenated derivative from bio-based malic acid and erythritol. The key Diels-Alder reaction is applied to build a substituted cyclohexene structure...
April 6, 2018: ChemSusChem
Zoe Stroud, Stephen C L Hall, Tim R Dafforn
Membrane proteins remain a somewhat enigmatic group of biomolecules. On the one hand they mediate some of the most important processes in biology with molecular mechanisms that are often elegantly complex. On the other hand they are exceptionally challenging to produce, making studies of membrane protein structure and function among the most difficult projects undertaken by biochemists. The central issue with studies of a membrane protein has been the need to extract them from their native lipid environment before purification and production of a homogenous sample...
March 30, 2018: Methods: a Companion to Methods in Enzymology
Jianhao Hua, Yang Jiao, Meng Wang, Yaling Yang
The authors describe a method for the determination of norfloxacin (NOR) or ciprofloxacin (CIP). It is making use of a combination of fluorescence enhancement and magnetic solid-phase extraction (MSPE). Sulfur-doped carbon dots (S-CDs) are used as a fluorescent probe. They were prepared by a one-pot method using poly(4-styrenesulfonic acid-co-maleic acid) (PSMA) as a source for carbon and sulfur. NOR or CIP act as sensitizers of fluorescence (with excitation/emission maxima at 324/412 nm), probably due to strong hydrogen bond interaction and charge transfer with the S-CDs...
January 27, 2018: Mikrochimica Acta
Chancui Wu, Jie Liu, Xuehong Zhang
High performance liquid chromatography (HPLC) was used for the separation and quantification of the low molecular-mass organic acids in the root exudates of Cr-hyperaccumulator Leersia hexandra Swartz. Eight organic acids, oxalic, tartaric, formic, malic, lactic, acetic, maleic and citric acids, were separated on an XSelect HSS T3 column (250 mm×4.6 mm, 5 μm) within 13 min with the mobile phase of 40 mmol/L potassium dihydrogen phosphate-phosphorous acid at pH 2.40, a flow-rate of 1.0 mL/min, a detection wavelength of 205 nm and a column temperature of 25℃...
February 8, 2018: Se Pu, Chinese Journal of Chromatography
Liping Zhao, Juan Qiao, Ke Zhang, Dan Li, Hongyi Zhang, Li Qi
A chiral ligand exchange capillary electrochromatography (CLE-CEC) protocol was designed and implemented for d,l-amino acids enantioseparation with poly(maleic anhydride-styrene-methacryloyl-l-arginine methyl ester) as the coating. The block copolymer was synthesized through the reversible addition fragmentation chain transfer reaction. In the constructed CLE-CEC system, poly (methacryloyl-l-arginine methyl ester) moiety of the block copolymer played the role as the immobilized chiral ligand and Zn (II) was used as the central ion...
March 15, 2018: Journal of Chromatography. A
Charlene Wu, Chi-Hung Chen, Hsin-Chang Chen, Hao-Jan Liang, Shu-Ting Chen, Wan-Yu Lin, Kuen-Yuh Wu, Su-Yin Chiang, Ching-Yu Lin
No abstract text is available yet for this article.
May 2018: Journal of Applied Toxicology: JAT
Vasudev Ballal, Juliana das Neves Marques, Celso Neiva Campos, Carolina Oliveira de Lima, Renata Antoun Simão, Maíra do Prado
BACKGROUND: To evaluate the effect of distilled water, EDTA, phosphoric acid and maleic acid on Biodentine regarding surface topography, micro hardness and push out bond strength (POBS). METHODS: 52 cylindrical shaped Biodentine specimens were divided in groups: Control (Distilled water); EDTA (17% EDTA); PA (37% phosphoric acid) and MA (7% maleic acid). Surfaces were evaluated by topographic analysis and Vicker's micro hardness test. Topographic changes were evaluated qualitatively and micro hardness was statistically analyzed by Kruskal-Wallis test...
March 24, 2018: Australian Dental Journal
Alfredo Briones-Herrera, Sabino Hazael Avila-Rojas, Omar Emiliano Aparicio-Trejo, Magdalena Cristóbal, Juan Carlos León-Contreras, Rogelio Hernández-Pando, Enrique Pinzón, José Pedraza-Chaverri, Laura Gabriela Sánchez-Lozada, Edilia Tapia
Maleic acid (MA)-induced nephropathy that is characterized by proteinuria, glycosuria, phosphaturia and a deficient urinary acidification and concentration. Sulforaphane (SF) is an indirect antioxidant that shows nephroprotective effects. The aim of the present work was to test the pre-treatment with SF against the MA-induced nephropathy. Wistar rats (230-260 g) were separated in the following groups: control, MA (which received 400 mg/kg of MA), SF + MA (which received MA and 1 mg/kg of SF each day for four days) and SF (which only received SF)...
May 2018: Food and Chemical Toxicology
Dipendra Gyawali, Jimin P Kim, Jian Yang
A novel photo-crosslinkable nanogel is prepared from a biodegradable polymer template with intrinsic photoluminescence and high photostability. The fluorescent nanogels display excellent biodegradability and cytocompatibility owed to the facile synthesis scheme involving a solvent-and surfactant-free one-pot reaction, derived entirely from biocompatible monomers citric acid, maleic acid, L-cysteine, and poly(ethylene glycol). The resultant nanogels are less than 200 nm in diameter with a narrow size distribution and monodispersity, and demonstrate long-term structural stability in biological buffer for two weeks...
March 2018: Bioactive Materials
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