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363 Newest Publications in chemical papers

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Enantioselective extraction of hydrophilic 2-chloromandelic acid enantiomers by hydroxypropyl-β-cyclodextrin: experiments and modeling

26-Oct-2012 | Cong-Shan Zhou, Ping Xu, Ke-Wen Tang, Xin-Yu Jiang, Tao Yang, Pan-Liang Zhang, Chemical Papers, 2012

Enantioselective extraction of hydrophilic 2-chloromandelic acid (CMA) enantiomers from organic to aqueous phase with hydroxypropyl-β-cyclodextrin (HP-β-CD) as the selector was investigated. Equilibrium of the extraction system was modeled using a reactive extraction model with a homogeneous ...

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Facile synthesis of gemini surface-active ATRP initiator and its use in soap-free AGET ATRP mini-emulsion polymerisation

26-Oct-2012 | Chuan Jie Cheng, Quan Lei Fu, Xiong Xiong Bai, Shao Jin Liu, Liang Shen, Wu Qin Fan, Hong Xia Li, Chemical Papers, 2012

A novel cationic gemini surfactant has been readily synthesised in 70 % total yield. The functional gemini surfactant can act both as an emulsifier and an atom transfer radical polymerisation (ATRP) initiator in mini-emulsion polymerisation of methyl methacrylate (MMA), in which no other ...

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Thermal decomposition of lanthanide(III) complexes of bis-(salicylaldehyde)-1,3-propylenediimine Schiff base ligand

26-Oct-2012 | Ziyad A. Taha, Abdulaziz M. Ajlouni, Jamil Al-Mustafa, Chemical Papers, 2012

The thermal decomposition of lanthanide complexes, with a general formula: [LnL(NO3)2](NO3), where Ln = La, Pr, Nd, Sm, Gd, Tb, Dy, and Er; and L = bis-(salicyladehyde)-1,3-propylenediimine Schiff base ligand, was studied by thermogravimetric (TG) and derivative thermogravimetric (DTG) ...

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A new phenanthroindolizidine alkaloid from Tylophora indica

26-Oct-2012 | Mini Dhiman, Amit Khanna, Sreedharannair L. Manju, Chemical Papers, 2012

A new phenanthroindolizidine alkaloid, 3-O-demethyl tylophorinidine (VI), was isolated from the aerial (leaves and stem) parts of Tylophora indica and characterized using different spectral techniques. Gel chromatography and reverse phase preparative HPLC were used for sample purification. The ...

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Molybdate sulfonic acid: preparation, characterization, and application as an effective and reusable catalyst for octahydroxanthene-1,8-dione synthesis

26-Oct-2012 | Bahador Karami, Zahra Zare, Khalil Eskandari, Chemical Papers, 2012

Molybdate sulfonic acid (MSA) as a highly efficient catalyst was synthesized and employed for the synthesis of octahydroxanthene-1,8-dione derivatives. MSA efficiently catalyzed condensation of a wide range of aryl aldehydes and cyclohexane-1,3-diones to obtain octahydroxanthene-1,8-diones. It ...

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Entrapment of ethyl vanillin in calcium alginate and calcium alginate/poly(vinyl alcohol) beads

26-Oct-2012 | Steva Levic, Verica Djordjevic, Nevenka Rajic, Milan Milivojevic, Branko Bugarski, Viktor Nedovic, Chemical Papers, 2012

Electrostatic extrusion was applied to the encapsulation of 3-ethoxy-4-hydroxybenzaldehyde (ethyl vanillin) in calcium alginate and calcium alginate/poly(vinyl alcohol) beads. The calcium alginate/poly(vinyl alcohol) hydrogel spheres were formed after contact with the cross-linker solution of ...

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Equilibrium and kinetics of protein binding on ion-exchange cellulose membranes with grafted polymer layer

17-Oct-2012 | Ivana Tatárová, Peter Dreveňák, Anna Kosior, Milan Polakovič, Chemical Papers, 2012

The performance of weak and strong anion- and cation-exchange membrane adsorbents with a grafted gel layer (Sartobind Q, D, S, and C) was investigated using six proteins: bovine serum albumin, human serum albumin, α-lactalbumin, β-lactoglobulin, lysozyme, and myoglobin. Static binding experiments ...

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Facile synthesis of 3-substituted quinazoline-2,4-dione and 2,3-di-substituted quinazolinone derivatives

17-Oct-2012 | Mahmoud Farouk, Salman A. Alrokayan, Ahamad Imran, Khalid M. Abu-Salah, Mohamed Ghazzali, Khalid A. Al-Farhan, Salem ..., Chemical Papers, 2012

3-Substituted quinazoline-2,4(1H,3H)-dione and 2,3-di-substituted quinazolineone derivatives attract considerable interest due to their pharmacological properties. In this paper, we report the synthesis of N-substituted-3-nitrophthalimide derivatives II–III, the reactions of phthalimide III with ...

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Airlift reactor — membrane extraction hybrid system for aroma production

13-Oct-2012 | Mário Mihaľ, Sean Peter Gavin, Jozef Markoš, Chemical Papers, 2012

In recent times, environmental production methods and organic products are increasingly sought after in food, perfume, and cosmetic industries, where the products are consumed or come into direct contact with humans. One such additive is 2-phenylethanol, an alcoholic aromatic rose like smell ...

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Characterisation of VOC composition of Slovak monofloral honeys by GC×GC-TOF-MS

13-Oct-2012 | Ivan Špánik, Antónia Janáçová, Zuzana Šusterová, Tibor Jakubík, Nikoleta Jánošková, Pavel Novák, Robert Chlebo, Chemical Papers, 2012

Solid phase microextraction (SPME) followed by comprehensive two-dimensional gas chromatography coupled to a time-of-flight mass spectrometer (GC×GC-TOF-MS) was used to characterise volatile organic compounds in honeys of different botanical origins. Rape, sunflower, acacia, lime, raspberry, and ...

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