tartaric acid (11.9 g) was dissolved in 165 ml of methanol. This mixture was heated on a steam bath. Racemic (+‚-) α-phenylethylamine was slowly added to mix well. Solution was allowed to cool for 15-20 minutes to observe crystallization of the salt. After observing the precipitate‚ prims formation that appeared like sand‚ the solution was corked and left at student lockers for a week. After a week‚ solution was poured from the crystals. Methanol (10 ml) was then added to the flask containing
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mL min-1. The column was kept at ambient temperature and the wavelength of the detector was at 225 nm. Standard solutions Stock solutions of LVD‚ CBD and ETC containing to 1.0 mg mL-1 were prepared separately by dissolving 50.0 mg in 50 mL of methanol by sonication. The stock solutions were diluted with the mobile phase to prepare working solutions. For each drug‚ the solutions were stable for 7 days when preserved in the refrigerator
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effective and efficient. The most important aspect of the recrystallization technique is the selection of the solvent. A large number of solvents are commonly used for recrystallization of organic compounds. Among these are water‚ ethanol‚ ethyl ether‚ methanol‚ and hexane to name just a few. A solvent‚ which works beautifully for one recrystallization‚ may be totally unsuitable for purification of a different compound - the choice for recrystallization solvent is made on a case-by-case basis. This is because
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16 Application of TLC in the Isolation and Analysis of Flavonoids Marica Medi-Šari‚ Ivona Jasprica‚ c c Ana Mornar‚ and Željan Maleš CONTENTS Introduction ................................................................................................ 405 16.1.1 Chemistry‚ Biochemistry‚ and Medicinal Significance of the Flavonoids.......................................................................... 405 16.1.2 Brief Overview of Use of TLC in the Analysis of Flavonoids in Plants ........
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of sand was added to the top of the silica. More eluent was added and drained until it was level with the top of the sand. Extraction of pigments 3-4 baby spinach leaves were gathered and placed into a mortar with a small amount of sand. 8mL of methanol was measured out and added to the mortar. A stemmed funnel lined with a filter was clamped and placed into a 125mL separatory funnel (with stopcock closed). The spinach was crushed with a pestle until it turned a dark green
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AIM: I am carrying out an investigation to see which alcohol is the best fuel. I will do this by experimenting with different alcohols and setting them alight and measuring different factors. I will analyse all my results and try to discover patterns‚ which should help me to conclude which alcohol is the best fuel. PLAN ==== This is how my experiment will be set out: ========================================== Keeping this experiment a fair test ===================================
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study. The question was that‚ would the production rate of citric acid (CA) by Aspergillus niger ATCC9642 from whey can be affected by different specific concentration of sucrose‚ glucose‚ fructose‚ galactose riboflavin‚ tricalcium phosphate and methanol in surface culture process? The focus of the investigation was to produce citric acid by
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result in high yield of pectin and residual oil extracted from orange peels using the methanol pre-treatment to extract orange peel oil and hydrochloric acid for pectin extraction. Ethanol is used as the precipitating agent. The experiment was conducted using varying concentration of the acid in the extraction step and varied volumetric ratio of the Ethanol in the precipitation. The results obtained showed that methanol extraction of oil as a pre-treatment gave a higher yield of pectin than using hydrochloric
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The free radical polymerization is usually terminated by two mechanisms‚ coupling or disproportionation. Either mechanism involves the reaction between two growing chain ends. In this lab‚ the reaction is terminated by adding small amount of methanol to the reaction mixture. Operational Procedure: Bulk Polymerization: Styrene polymerizations were performed in a round bottom flask with one open arm. 10 ml (96.015 mmol) of dry‚ oxygen free styrene and 0.2 g (1.218 mmol) of AIBN was
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• Regular (industrial) grade offers a minimum assay of 96%‚ a maximum methanol content of 2.5%‚ and a maximum water content of 1.5%. • High purity grade offers a minimum assay of 99.5%‚ a maximum methanol content of 0.10%‚ and a maximum water content of 0.05%. In many applications‚ Eastman methyl acetate can be an effective replacement for acetone and other fast-evaporating solvents. Strength—assay Methanol Water Acidity as acetic acid Color‚ PCS Some common cleaning applications
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