Biological investigation of Arum palaestinum 6.1. Antioxidant activity The antioxidant activity of the ethyl acetate fraction of A. palaestinum characterized by its strong DPPH free radical scavenging activity (SC50 3.1 ±0.82 μg/mL) [4]. Both of the aqueous and ethanol extracts had remarkable antioxidant activities about 43.1‚ 12.7%‚ respectively [39]. Recently
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attraction to the silica is shown through the higher Rf values‚ 4‚4-diaminodiphenylmethane and 3‚4-dimethylphenol don?t have the same IMFs. These compounds contain H-bonding capabilities‚ which interact more with the silica‚ or the stationary phase‚ as ethyl acetate?s more polar nature mixed well with them due to their greater affinity towards polar conditions. This is exemplified by the low Rf values of 4‚4-diaminodiphenylmethane and
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and stirrer were then set to 7.0 and turned on. The batch reactor was started to ensure the conductivity probe was functional and the reading was displayed on the PC. 500mL of ethyl acetate was then added to the reactor‚ which was maintained at approximately thirty degrees Celsius by a water bath. As soon as the ethyl acetate was added‚ the conductivity and temperature were measured at two minute intervals until the conductivity plateaued‚ indicating the point of maximum conversion for the reaction
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Laboratory #6 Qualitative Tests for Carbonyls: Aldehydes vs. Ketones Introduction Various chemical tests identifying ketones and aldehydes are used in this experiment in order to identify an unknown carbonyl compound. The tests used are: 2‚4-dinitrophenylhydrazone test‚ Tollen’s Test‚ Benedict’s Test‚ Chromic Acid Test‚ aka Bordwell-Wellman Test‚ Schiff’s Test‚ and Iodoform Test. These classification tests provide results based on color change or formation of precipitation‚ which is then used
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Biological Activities of Paris polyphylla found in Himalayan Region of Nepal Prabin Koirala‚ Khagesh Chataut and Keshab Bhattarai Department of Biotechnology‚ WhiteHouse Institute of Science and Technology‚ Purbanchal University‚ Lalitpur‚ Nepal. e-mail: prabinkoirala122@gmail.com Abstract The study focused on phytochemical and biological analysis of Paris polyphylla (PP). Crude Chloroform/Methanol (1:1) extraction performed on the rhizomes of Paris polyphylla collected from himalayan region
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CHEM3412 Synthesis of a Porphyrin Porphyrins are hetereonuclear‚ macrocyclic compounds that play an important role in living organisms. Examples include the non-protein heme portion of hemoglobin in animals whereby the lone pairs on nitrogen can bind to the oxygen-carrying iron. In plants‚ chlorophyll uses the vast conjugation to allow absorption of light for photosynthesis. The characteristic colors of porphyrins is also due to the conjugation. An examination of the porphyrin structure
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Literature Survey 2. Literature Survey Literature survey indicated 135 possible routes for the synthesis of 2-Aminobiphenyl. It must be noted that all routes available were lab-scale and no patents for the desired compound were available. Also‚ majority of these synthesis routes gave extremely low yields of our desired product and produced a number of other by-products in higher yields. Therefore‚ only the pathways giving significant yields of the desired product have been listed below. i. Suzuki
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in hood‚ and record the observation. Part A (combustion of toluene) pour 1 milliliter of toluene into a evaporating dish and ignite it with a flaming wood splint. Most importantly put the flame with a watchglass. Part B (combustion of ethyl alcohol)‚ pour 1 mL of ethyl alcohol into an evaporating dish and same as part A ignite with flaming wood. Importantly put out the flame with a watchglass. Part C (combustion of acetylene)‚ invert a test tube with water into a 600-mL beaker about
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glacial acetic acid‚ slightly soluble that is in ethanol and in acetonitrile‚ and practically insoluble in ethyl acetate and in n-hexane. Rivastigmine (Exelone) known as a reversible cholinesterase inhibitor that is a white to off-white‚ fine crystalline powder that is very soluble in water‚ soluble in ethanol and acetonitrile‚ slightly soluble in n-octanol and very slightly soluble in ethyl acetate. Galantamine (Razadyne) is a powder that is white and sparingly soluble in
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Introduction Metallic yarns or threads‚ in general‚ have been known for more than 3000 years. Gold and silver were hammered into extremely thin sheets‚ then cut into ribbons and worked into fabrics. These were the first ‘man made’ fibres‚ which came thousands of years before nylon or rayon. The Persians made fabulous carpets with gold thread and the Indians‚ ornamental sarees with it. The metal threads were twisted‚ doubled or wrapped around some other thread such as cotton. With the advancement
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