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Influence of cerium ions on structure-dependent magnetic properties of Ba-Sr M-type hexaferrite nanocrystals

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Journal of Rare Earths 2024年第2期42卷 364-372,I0005页

作者： Ram A.pawar sunil M.Patange P.M.Dighe Sher Singh Meena Abdullah GAl-Sehemi Mehboobali Pannipara Santosh S.Jadhav Department of Physics ArtsCommerce and Science CollegeAhmednagar413711MaharashtraIndia Department of Physics Shri Krishna MahavidyalayaGunjotiDistOsmanabad413606MaharashtraIndia Padmashri Vikhe Patil College of Arts Science and CommercePravaranagarA/P.Loni(Kd)Tal.RahataDistAhmednagar413713MaharashtraIndia Solid State Physics Division Bhabha Atomic Research CentreMumbai400085MaharashtraIndia Department of Chemistry King Khalid UniversityAbha61413Saudi Arabia Department of Physics D.S.M's ArtsCommerce and Science CollegeJintur431509MaharashtraIndia

The present study is a systematic effort to investigate the structure-sensitive magnetic parameters of Ce^(3+) substituted Ba-Sr hexaferrite nanocrystals chemically formulated as Ba_(0.5)Sr_(0.5)Ce_(x)Fe_(12-x)O_(19) where x=0.0-0.2 with Δx=*** hexaferrite powders were prepared using the sol-gel self-ignition route and structurally characterized by means of powder X-ray diffraction and Fourier transform infrared *** creation of the M-type hexaferrite phase within the synthesized samples was revealed from the Rietveld refinement of the X-ray *** occurrence of a secondary phase of CeO_(2) was revealed within the hexaferrites for the substitution,x> *** refined X-ray diffraction data were utilized to compute the lattice parameters,X-ray density,and lattice parameter *** crystal structure plotted from the refined XRD data reveals the occupancy of the ions at different lattice *** XPS data of the hexaferrite were analyzed to confirm the oxidation states of the constituent *** nanocrystalline nature of the hexaferrites was revealed from the crystallite sizes calculated using Scherer's *** analysis of FTIR spectra confirms that only a fraction of Ce^(3+)accommodated in the lattice and the remaining Ce content reside in the form of the CeO_(2) *** morphology of the hexaferrites was analyzed from the FESEM profiles of the ferrite *** magnetic behavior study was performed by analyzing the Curie temperature,hysteresis loops,and hyperfine interactions by means of susceptibility,V.S.M,and Mossbauer spectroscopy,*** hexaferrites with increasing coercivity,decreasing saturation magnetization,and decreasing Curie temperature are reported in the *** substituted Ce^(3+)ions inhibit the grain growth and create lattice imperfections giving rise to hexaferrites with tuned magnetic parameters suitable for different applications.

关键词： Ba-Sr hexaferrite Ce^(3+)substitution XPS Saturation magnetization Coercivity M?ssbauer spectroscopy

Lagenaria siceraria fruit extract ameliorate fat amassment and serum TNF-αin high-fat diet-induced obese rats

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Asian Pacific Journal of Tropical Medicine 2012年第9期5卷 698-702页

作者： Sayyed Nadeem Pradeep Dhore Mohsin Quazi sunil pawar Navin Raj Technocarts Institute of Technology Pharmacy Anand NagarBhopalMadhypradeshIndia Agnihotri College of Pharmacy Bapuji WadiSindhi(Meghe)Wardha-442 001MaharashtraIndia

Objective:To investigate the effects of ethanolic extract of Lagenaria siceraria fruit(ELSF) on fat amassment and serum TNF-αin high-fat diet-induced obese ***:The high fat diet induced obese rals were orally treated with orlistat(50 mg/kg) and ELSF(100,200.300 mg/kg/day) to the respective treatment *** body weight,lasting blood glucose level,lipid profile, serum levels of tumor necrosis factor-α(TNF-α) in rats were measured after 30 days of treatment adn compared to the obese control ***:ELSF significantly(P < 0.001) reduced the body weight gain,fasting blood glucose,total cholesterol,triglyceride,total protein and TNF-α.Conclusions:These encouraging findings suggest that Lagenaria siceraria has excellent pharmacological potential to prevent fat amassment.

关键词： Lagenaria sicera Cucurbitaceae Fat amassment High fat diet

La_2O_3/TFE: An efficient system for room temperature synthesis of Hantzsch polyhydroquinolines

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Chinese Chemical Letters 2014年第8期25卷 1149-1152页

作者： sunil U. Tekale Vijay P. Pagore Sushama S. Kauthale Rajendra P. pawar Department of Chemistry Shri Muktanand College Department of Chemistry Deogiri College

Lanthanum oxide（La2O3） in combination with 2,2,2-trifluoroethanol（TFE） was found to be an efficient system for the one-pot, four-component synthesis of Hantzsch polyhydroquinoline derivatives from aromatic aldehydes, dimedone, ethyl acetoacetate and ammonium acetate at ambient temperature. The catalyst is heterogeneous and reusable, hence can be separated easily and reused. The present method is featured by mild reaction conditions, use of heterogeneous catalyst, non-chromatographic purification,short reaction time and high yields, which make it an attractive route for the synthesis of polyhydroquinolines.

关键词： Hantzsch polyhydroquinolines La2O3 TFE

Lithium bromide catalyzed solvent free method for synthesis of 2-substituted benzimidazoles and imidazopyridines

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Chinese Chemical Letters 2010年第5期21卷 519-523页

作者： Deepak V.Dekhane Shivaji S.pawar sunil V.Gupta Murlidhar S.Shingare Shivaji N.Thore Department of Chemistry Vinyakrao Patil Mahavidyala VaijapurAurangabad 423701MSIndia Department of Chemistry Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431004MSIndia

The first successful lithium bromide mediated solvent free condensation of arylenediamine and esters to obtain 2-substituted benzimidazole and imidazopyridine in good to excellent yields is described.

关键词： Benzimidazoles Arylenediamine Aliphatic esters Lithium bromide Imidazopyridines

LC-UV and LC-MS evaluation of stress degradation behavior of desvenlafaxine

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Journal of Pharmaceutical Analysis 2012年第4期2卷 264-271页

作者： Shubhangi M.pawar Laxman D.Khatal Satish Y.Gabhe sunil R.Dhaneshwar Research and Development Centre in Pharmaceutical Sciences and Applied Chemistry Poona College of PharmacyBharati Vidyapeeth University Bioanalytical Research Department BioAnalytical Technologies Pvt.Ltd.

The objective of current study was to develop a validated specific stability indicating reversed-phase liquid chromatographic method for the quantitative determination of desvenlafaxine in bulk sample and pharmaceutical dosage form in the presence of degradation products. Forced degradation studies were performed on bulk sample of desvenlafaxine as per ICH prescribed stress conditions using acid, base, oxidative and photolytic degradation to show the stability indicating power of the method. Significant degradation was observed under acidic stress condition and the degradation product formed was identified by LC-MS and a degradation pathway for drug has been proposed. Successful separation of drug from degradation products formed under stress conditions was achieved on a SymmetryShield column C 18 (5 mm, 250 mm 4.6 mm, i.d.) using the mobile phase consisting of a mixture of 0.2% (v/v) triethylamine in ammonium acetate (0.05 M; pH 6.5) and methanol using isocratic gradient.

关键词： Reversed-phase liquid chromatography Liquid chromatography mass spectrometer (LC/MS) Desvenlafaxine Stress studies Validation Degradation

Establishment of inherent stability of pramipexole and development of validated stability indicating LC-UV and LC-MS method

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Journal of Pharmaceutical Analysis 2013年第2期3卷 109-117页

作者： Shubhangi M.pawar Laxman D.Khatal Satish Y.Gabhe sunil R.Dhaneshwar Department of Pharmaceutical Chemistry Poona College of PharmacyBharati Vidyapeeth UniversityPuneMaharashtra 411038India Bioanalytical Research Department BioAnalytical Technologies Pvt.Ltd.PuneMaharashtra 411030India Department of Pharmaceutical Chemistry RAK Medical and Health Sciences UniversityCollege of Pharmaceutical SciencesRas Al Khaimah 11172United Arab Emirates

Pramipexole belongs to a class of nonergot dopamine agonist recently approved for the treatment of early and advanced Parkinson＇s disease.A validated specific stability indicating reversed-phase liquid chromatographic method has been developed for the quantitative determination of pramipexole in bulk as well as in pharmaceutical dosage forms in the presence of degradation *** degradation studies were performed by exposition of drug to hydrolytic（acidic and basic）,oxidative and photolytic stress conditions,as defined under ICH guideline Q1A（R2）.Significant degradation was observed under hydrolytic,oxidative and photolytic conditions and the degradation products formed were identified by LC-MS.

关键词： Degradation products Forced degradation/stress studies Liquid chromatography mass spectrometry Pramipexole Reversed-phase liquid chromatography

Novel one-pot synthesis of 4H-chromene derivatives using amino functionalized silica gel catalyst

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Chinese Chemical Letters 2014年第3期25卷 455-458页

作者： Vijaykumar M.Joshi Rupali L.Magar Prashant B.Throat sunil U.Tekale Bhagavan R.Patil Mangal P.Kale Rajendra P.pawar Department of Chemistry Karmveer Ramraoji Aher ArtsScience and Commerce College Department of Chemistry Deogiri College Department of Chemistry Dnyanopasak College Department of Chemistry Sharda Mahavidyalaya

A simple, efficient, and environmentally benign method for the synthesis of 4H-chromene derivatives was developed using well ordered and recoverable amino functionalized silica gel as a base catalyst. The 4H-chromene derivatives were obtained in short time and excellent yield （87%-96%） by three component reaction of aldehydes, malononitrile and cyclic 1,3-diketones in water at 70 ℃.

关键词： Aldehydes4H-ChromenesAmino functionalized silica gel

Primary hepatic amyloidosis:A case report and review ofliterature

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World Journal of Hepatology 2016年第6期8卷 340-344页

作者： Nikhil Sonthalia Samit Jain sunil pawar Vinay Zanwar Ravindra Surude Praveen M Rathi Department of Gastroenterology Topiwala National Medical College and BYL Ch HospitalMumbai 400008MaharashtraIndia

We describe a case of 42-year-old female presenting with abdominal pain associated with loss of weight and fever for 8 mo. On evaluation she had gross hepatomegaly with raised alkaline phosphatase and raised GGT levels with normal transaminases and bilirubin. On imaging she had diffuse enlargement of liver with heterogeneous contrast uptake in liver. Her viral marker and autoimmune markers were negative. Liver biopsy depicted massive deposition of amyloid in peri-sinusoidal spaces which revealed apple green birefringence on polarizing microscopy after Congo red staining. Cardiac and renal evaluation was unremarkable. Abdominal fat pad and rectum biopsy was negative for amyloid deposit. There was no evidence of primary amyloidosis as bone marrow examination was normal. Serum and urine immunofixation electrophoresis were normal. Immunoperoxidase staining for serum amyloid associated protein for secondary amyloidosis was negative from liver biopsy. We present this rare case of primary hepatic amyloidosis and review the literature regarding varied presentations of hepatic involvement in amyloidosis.

关键词： Amyloidosis Congo red staining Isolatedhepatic amyloidosis Amyloid associated protein Immunofixation electrophoresis

Unusual complication of amebic liver abscess: Hepatogastric fistula

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World Journal of Gastrointestinal Endoscopy 2015年第9期7卷 916-919页

作者： sunil V pawar Vinay G Zanwar Pravir A Gambhire Ashok R Mohite Ajay S Choksey Pravin M Rathi Dileep S Asgaonkar Department of Gastroenterology 7th floor OPD building Topiwala National Medical College and Bai Yamunabai Laxman Nair HospitalMumbai Central Department of Medicine 1st floor College buildingTopiwala National Medical College and Bai Yamunabai Laxman Nair HospitalMumbai Central

Amebic liver abscess is a parasitic disease which is often encountered in tropical countries. A hepatogastric fistula secondary to an amebic liver abscess is a rare complication of this disease and there are only a handful of reported cases in literature. Here we present a case of an amebic liver abscess which was complicated with the development of a hepatogastric fistula. The patient presented with the Jaundice, pain and distension of abdomen. The Jaundice and pain improved partially after he had an episode of brownish black colored increase in frequency of stools for 5 to 6 d. Patient also had ascites and anemia. He was a chronic alcohol drinker. Esophagogastroduodenoscopy performed in view of the above findings. It showed a fistulous opening with bilious secretions along the lesser curvature of the stomach. On imaging multiple liver abscesses seen including one in sub capsular location. The patient was managed conservatively with antiamebic medications along with proton pump inhibitors. The pigtail drainage of the sub capsular abscess was done. The patient improved significantly. The repeat endoscopy performed after about two months showed reduction in fistula size. A review of the literature shows that hepatogastric fistulas can be managed conservatively with medications and drainage, endoscopically with biliary stenting or with surgical excision.

关键词： Amebic liver abscess Hepatogastric fistula Esophagogastroduodenoscopy Entaameba histolytica Ultrasonography Computed tomography