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Eucleanal A and B:Two new napthalene derivatives from Euclea divinorum

Chinese Chemical Letters 2012年第5期23卷 576-578页

作者： Margaret Mwihaki Ng'ang'a Hidayat Hussain sumesh chhabra Caroline Langat-Thoruwa Ahmed AI-Harrasi Karsten Krohn Ivan Robert Green Department of Chemistry Kenyatta UniversityP.O.Box 43844-00100NairobiKenya Department Chemistry Universität PaderbornWarburger Straβe 10033098 PaderbornGermany Department of Biological Sciences and Chemistry College of Arts and SciencesUniversity of NizwaBirkat Al-MouzNizwa 616Oman Department of Chemistry University of the Western CapeP/Bag X17Bellville 7530South Africa

Two new naphthalene derivatives named eucleanal A and B（1 and 2） were isolated from Euclea *** structures of the new compounds were elucidated by detailed spectroscopic analysis such as ~1H,^（13）C NMR,COSY,HMQC,HM... 详细信息

关键词： Euclea divinorum Hiern Ebenaceae NMR Structure elucidation

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Rhizoclonium grande Bioethanol in Biofuel Production by Transesterification of Jatropha curcas Oil

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Green and Sustainable Chemistry 2018年第1期8卷 62-73页

作者： J. Mwangi Kahindo sumesh C. chhabra Odalo J. Ochieng Thomas Thoruwa Department of Pure and Applied Science Technical University of Mombasa (TUM) Mombasa Kenya Chemistry Department Kenyatta University Nairobi Kenya Department of Physics and Technology Pwani University Kilifi Kenya

There is a need for an alternative sustainable fuel based on renewable sources and efficient carbon dioxide scrubbers. Alkyl esters prepared by transesterification of vegetable oils from various plants have been evaluated. In this work the potential of sustainable macroalgae bioethanol in biofuel production by transesterification of Jatropha curcas oil was assessed. Rhizoclonium grande macroalgae was collected from Shimoni shores in Kwale, Shelly beach in Mombasa, Jamvi la Wageni in Mtongwe Likoni, English point near Kenya Marine and Fisheries Research Institute (KMFRI) Mombasa, dried and processed to obtain 5.36% ± 0.355% v/w bioethanol using Aspergilus niger for hydrolysis and Saccharomyces cerevisiae for fermentation. J. curcas seeds were collected from contracted farmers of Energy Africa in Shimba hills, Coast region. Oil from the seeds was machine cold pressed and solvent extracted using n-hexane giving 44% - 53%v/w yield. The physicochemical properties of the J. curcas oil were investigated. Transesterification of J. curcas oil was carried out using bioethanol from the algae with 63% - 70% FAEE yield. Characterisation of the bioethanol and ethyl esters was done using GC-MS. Physicochemical and fuel properties of the biofuel were investigated at Technical University of Mombasa (TUM), Jomo Kenyatta University of Agriculture and Technology (JKUAT), Government Chemist and Kenya Pipeline Laboratories in Mombasa. There was significant difference in physicochemical and fuel properties observed in density, calorific value, kinematic viscosity, pour point and cloud point between the Jatropha oil and Jatropha fatty acid ethyl esters (JAT FAEE) samples. No significant difference observed in the physicochemical and fuel properties between the JAT FAEE and standard biodiesel samples. This was according to statistical analysis of data done using STATA/SE 13.0 and Xlstat at 95% confidence level (P < 0.05) two-tailed. From the findings bioethanol from R. grande biomass used i

关键词： Jatropha curcas Rhizoclonium grande Biofuel Physico-Chemical Properties and Fuel Properties

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