The Effect of Solvent Exposure and Temperature on Beet Cell Membrane Integrity Introduction: • Cell membranes are vital to proper cellular function • Cell membranes consist of a lipid bilayer made up of phospholipids • Phospholipids are amphipathic molecules meaning they have a dual nature in that they show both hydrophilic (water-loving) and hydrophobic (water-fearing) properties • The amphipathic nature of phospholipids causes them to spontaneously form bilayers in water
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to 10 mL with methanol. One mL of the above solution was diluted to 100 times in a 100 mL volumetric flask with methanol to produce stock solution of 10 g/mL. From this solution 1‚ 2‚ 3‚ 4‚ 5‚ 6‚ 7‚ 8‚ 9 and 10 mL were withdrawn separately in different 10 mL volumetric flasks and volume was made up in each case up to 10mL with methanol to produce the concentrations 1‚ 2‚ 3‚ 4‚ 5‚ 6‚ 7‚ 8‚ 9 and 10 g/mL. Absorbances of these solutions were recorded at max 405.9 nm against methanol as blank using
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evaporate. To test this‚ the temperature change from the evaporation of 4 different alcohols was measured and compared‚ along with cyclohexane. Methanol had the largest change in temperature‚ 18.9 ºC. This indicates that methanol has the weakest intermolecular attractions out of the 4 alcohols‚ because it evaporated the most. This may be because methanol is a small molecule so it has less electrons and therefore is not as polarizable as
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Purpose: The purpose of distillation is to purify a liquid. Distillations are use to purify contaminates out of water to obtain clean pure water‚ as well as‚ to separate mixtures of liquids into their individual components; e.g. methanol and water. Objective: Distill methanol from water using a simple distillation apparatus and fractional distillation apparatus to determine which is a more accurate form of distillation. Chemical reaction and mechanism: N/A Procedure: This experiment is conducted
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Isolation of the active ingredient in an Analgesic Drug from extraction‚ filtration and melting point. Chm237 Abstract: Acetaminaphen was crushed then extracted for the active ingredient by mixing it with methanol. Then separated from the binders by centrifugation and a filtration technique using a Pasteur pipet packed with alumina. The remaining solvent was then evaporated to yield the solid analgesic(.2295g‚ 45.9% yield) which was collected by filtration and tested for the
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experiment aimed to study the effect of various denaturants on albumin and casein protein extracts through viscosity measurements. 5 mL samples of native and denatured protein solutions were prepared‚ using -mercaptoethanol‚ urea and SDS as denaturants for albumin‚ and NaOH‚ NaCL‚ HCL‚ -mercaptoethanol‚ urea and SDS for casein. 5 mL blank solutions for each denaturant used were also prepared. The viscosity of the solutions were determined using Ostwald viscometer. ____________________________________________________________________________________
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25% alcohol had .022‚ and 50% alcohol had .177. The highest concentration of acetone inflicted more damage on the membrane of the beetroot causing it to leak its betacyanin in a higher intensity than any of the other solvents had caused. Acetone and methanol can both cause damage to the membrane of the beetroot but acetone has a greater ability and is more damaging. The beet root model system shows the effects of chemical stress on membranes. Introduction: The membrane of the cell contains
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fluid properties: i. Mass density ii. Specific weight iii. Relative density iv. Dynamic viscosity v. Kinematic viscosity INTRODUCTION Fluid Mechanics Gas Liquids Statics i F 0 F 0 i Laminar/ Turbulent Dynamics ‚ Flows Compressible/ Incompressible Air‚ He‚ Ar‚ N2‚ etc. Water‚ Oils‚ Alcohols‚ etc. Stability Pressure Buoyancy Surface Tension Compressibility Density Viscosity Vapor Pressure Steady/Unsteady Viscous/Inviscid Fluid Dynamics: Chapter 1: Chapter
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molecules‚ ions‚ and atoms together. The intermolecular forces that can be present in a solution are london dispersion forces‚ dipole-dipole force‚ hydrogen bonding and ion-dipole forces. In this experiment the substances that were used were acetone‚ methanol‚ water‚ 1- butanol and ethyl acetate. Acetone is the organic compound with the formula (CH₃)₂CO. It is a colorless‚ volatile‚ flammable liquid‚ and is the simplest ketone. It takes 21 seconds for it to completely disappear. It was the first to evaporate
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Benzophenone’s nonpolar nature makes it insoluble with water (which is polar)‚ soluble with methanol (which is of intermediate polarity) and soluble with hexane (which is nonpolar). This is because generally‚ like dissolves like -- nonpolar will dissolve nonpolar but not polar‚ and vice versa. But note that this is an imperfect science -- you would expect hexane to dissolve faster and more completely than methanol (because of the differing polarities)‚ but the opposite occurred. This may be because of
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