Synthesis of genkwanin

927-92

Effect of zinc and manganese supplementation to tricalcium phosphate rich diet for tiger puffer (Takifugu rubripes)

Effects of zinc (Zn) and manganese (Mn) supplementation to a tricalcium phosphate (TCP) rich diet for tiger puffer have been investigated. A TCP supplement to the diet decreased the growth of fish compared to the control diet with a Ca supplementation from Ca-lactate. However, addition of either Zn or Mn to the TCP supplemented diet could not improve the growth of tiger puffer. Addition of both zinc and manganese to the TCP supplemented diet improved the growth of tiger puffer

IDENTIFICATION OF SOME CARCINOGENIC POLYCYCLIC AROMATIC HYDROCARBONS IN BANGLADESHI VEHICLES EXHAUST TAR BY GAS CHROMATOGRAPHY-MASS SPECTROPHOTOMETER

ABSTRACT A more sensitive Gf:-MS method has been established for the determination of some carcinogenic polycyclic aromatic hydrocarbons (PAHs) in vehicles exhaust tar samples. The tar samples were extracted using dichloromethane (DMC): n-hexane solvent mixture. A multi-layer clean-up (silica geVsodiumsulphate) column was used, followed by glass fiber filter (GFF) paper. The method was successfully applied to determine a number of PAHs present in exhaust tar sample of different vehicles of the Atomic Energy Centre,Dhaka, Bangladesh. Keywords: Carcinogenic polycyclic aromatic hydrocarbons, vehicles tar samples, identification, GC-MS/M

TOXIC NORMAL HYDROCARBONS (NHs) IN THE FISH SAMPLES FROM DIFFERENT PARTS OF BANGLADESH

Toxic normal hydrocarbon (NH), nonadecane in the dichloromethane-hexane crude extract of the flesh of fish samples collected from the different districts of Bangladesh was analyzed by GC-MS/MS. It was observed that NH deposition on the samples takes place in different morphological parts of the biological materials. The NH, nonadecane, was found in the fish samples collected from the roadside by the extraction of dichloromethane-hexane mixture solvents.   Keywords: Toxic normal hydrocarbon, nonadecane, quantification, Bangladeshi fish GC-MS/M

Electrical Power Profile Prediction by Using Rice Statistics in Bangladesh

ABSTRACT: In developing country like Bangladesh, the demand of electrical power is very higher than the available production. Bangladesh is an agriculture based country and production of rice is increasing in tremendous amount in the last decade. Rice husk based power plants are already installed in India, Indonesia and South Korea. However there are some locations in which rice husk based power station projects could be feasible in Bangladesh. By analyzing the previously collected data on the selected location, this work has been carried out to predict if these resources are sufficient for rice husk power, in the hope to extract electrical power. By analyzing this data, this work has been carried out to predict if these energy resources are sufficient for power extraction

Financial Analysis of Textile Sector in Bangladesh: A Study on Selected Textile Companies

The Textile sector of Bangladesh has got a greater facet than any other sector in terms of growth and foreign exchange earnings. It makes a significant contribution to the national economy by creating generous employment opportunities and reducing poverty through socioeconomic development. The paper focuses on the financial strength of the textile sector in Bangladesh. And to know that up to what extent textile sector has used their available resources effectively. For this purpose profitability, liquidity and solvency position of textile companies has been examined. In this paper comparative ratio analysis technique has been used to know the financial soundness of textile companies. The result shows the profitability margins is slightly different due to volatile textiles market and volatility in raw material prices. The Liquidity and solvency position is almost the same in all the textile companies. Keywords: Textile Sector, profitability, liquidity, volatility and solvency

PHYTOCHEMICAL STUDY OF THE ARIAL PARTS OF <i>Cleome rutidosperma</i> DC PLANT

Two new compounds were identified as 2-ethyl-cyclohex-2-ene-6-hydroxy-methylene-1-carboxylic acid and 3b-hydroxy-lup-20(29)-en-28-oic acid, respectively, from the petroleum ether extracts of Cleome rutidosperma plant. These two constituents is the first time occurrence in this plant. The structures of the two different type of compounds are elucidated with the help of UV, IR, 1H-NMR, 13C-NMR, COSY, DEPT 90, DEPT 135 and mass spectral data.   Keywords: Cleome rutidosperm DC; isolation; spectral analysi

A NEW PRENYLATED FLAVANONE FROM THE ARIAL PART OF <i>Orthosiphon stamineus</i>

Phytochemical investigations on the chloroform extract of the arial part of Orthosiphon stamineus resulted in isolation of one new prenylated compound 5,7-dimethoxy-3,4′-dihydroxy-3′,8-di-C-prenylflavanone together with four known flavonoids compounds, sinensetin, eupatorin, 5,6,7,4¢-tetramethoxyflavone and 3-hydroxy-5,6,7,4¢-tetramethoxyflavone. The structures were deduced on basis of different analytical methods such as UV, IR, 1H-NMR, 13C-NMR, DEPT, COSY, HMBQ and GC-MS. The prenylated compound is reported for the first time from this plant.   Keywords: Orthosiphon stamineus, prenylated flavanone, flavonoid

PHYTOCHEMICAL STUDIES OF THE PETROLEUM ETHER EXTRACT OF THE LEAVES OF Lagerstroemia speciosa Linn

Two new compounds, normal alcohol containing of higher carbons and isomer of β-sitosterol were isolated for the first time from the petroleum extract of the leaves of Lagerstroemia speciosa. The structure of the compound has been established on the basis of UV, IR, 1H-NMR, 13C-NMR and mass spectra and identified as nonanol and isomer of β-sitosterol.   Keywords: Lagerstroemia speciosa, petroleum ether extracts, isolation, 1-nonanol, 2 β-sitostero, spectral analyses

Determination of phenol in the Bangsai river water of Bangladesh by gas chromatography-mass spectrometry

A simple, sensitive and rapid gas chromatography-mass spectrometry (GC-MS) method is proposed for the analysis of some environmentally important highly toxic phenols in water. The concentration level of phenol was determined in water at the sampling stations of Savar, Dhaka Export Processing Zone (DEPZ) and Bank Colony of the Bangsai river, Bangladesh. Water samples were collected from different depth of the sampling stations. The phenolic compounds were extracted with dichloromethane, which was further preconcentrated by evaporation. Different concentrations of toxic phenol were obtained in the river water at the various sampling stations. The concentration of highly toxic phenol was found in the range of 0.01 – 0.998 μg∙L⁻¹. This method could permit the analysis of water for phenol as well as phenolic derivatives with detection limit as low as 100 ng∙L⁻¹.Предложен проcтой и экспрессный метод газовой хроматографии и масс-спектроскопии (ГХ – МС) для анализа некоторых высокотоксических фенолов в воде, имеющих большое значение в окружающей среде. Уровень концентрации фенола определяли в воде на станциях отбора проб в Саваре, в зоне обработки экспорта в Даке (ЗОЭВ), а также Банковской колонии на реке Бенгази (Бангладеш). Образцы воды отбирали на разных глубинах на станциях отбора проб. Фенольные соединения выделяли с помощью дихлорометана, который в дальнейшем предварительно концентрировали путем выпаривания. Концентрация фенола была получена в диапазоне 0.01– 0.998 mg∙L⁻¹. Этот метод дает возможность проводить анализ воды на содержание фенола, а также фенольных производных с пределом обнаружения 100 ng∙L⁻¹.Запропоновано проcтой і експресний метод газової хроматографії та мас-спектроскопії (ГХ – МС) для аналізу деяких високотоксичних фенолів у воді, які мають велике значення в навколишньому середовищі. Рівень концентрації фенолу визначався у воді на станціях відбору проб у Саварен, в зоні обробки експорту в Даке (ЗОЕВ), а також Банківської колонії на річці Бенгазі, Бангладеш. Зразки води відбирали на різних глибинах на станціях відбору проб. Фенольні сполуки виділялися за допомогою діхлорометана, який надалі попередньо концентрували шляхом випарювання. Концентрація фенолу була отримана в діапазоні 0.01– 0.998 mg∙L⁻¹ Цей метод дає можливість проводити аналіз води на вміст фенолу, а також фенольних похідних з межею виявлення 100 ng∙L⁻¹