Heironimus‚ White 3 There are four main macromolecules; proteins‚ nucleic acids‚ lipids‚ and carbohydrates. The presence of some of these‚ such as sugar‚ fat‚ starch‚ and protein‚ can be determined using tests such as Benedict’s solution‚ Lugol’s iodine solution‚ Biuret’s reagent‚ and Sudan III. Control tests were performed to determine what a positive result would appear like. Then the tests were performed using substances containing sprite‚ fries‚ hamburgers‚ and chicken nuggets. Results matching
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the unknown solution. The macromolecules being tested in this lab were carbohydrates (monosaccharides and polysaccharides) and proteins. To identify the presence of these macromolecules in a substance‚ three different tests were performed. Lugol ’s iodine solution was used for identification of starch and glycogen - polysaccharides - in the twelve solutions. A positive outcome of the test results in a colour change; blue-black in the presence of starch and a red-brown in the presence of glycogen. A
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water‚ ev milk‚ 50% egg solution‚ 1% sucrose‚ 4 test tubes‚ 1 test tube rate‚ safety glasses‚ pipets and the reagent solution. For test 2 for starches the following materials were used: Di water‚ 1% starch solution‚ onion juice‚ sucrose solution‚ iodine reagent‚ 4 test tubes‚ test tube rack and pipets. In test 1 and test 2 each solution was placed in a separate test tube with the corresponding reagent added to each as well. In test one for proteins each substance that showed a purple color it indicated
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Thermochromism Thermochromism refers to the phenomenon of color changes by the agency of heat. Obviously‚ the color changes are made possible by the temperature-induced chemical or physical changes of materials incorporated into the inks. Sometimes‚ the color change occurring at a temperature is permanent‚ and at other times the original color can be regained on cooling. Accordingly‚ we have an irreversible or reversible thermochromic system. The required chemistry can be adopted based
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inhibitory (antimicrobial) activity against the organism. This experiment deal with the evaluation of antimicrobial activity of two antiseptics which are 5 % iodine and 5% formaldehyde‚ against two organism Pseudomonas fluorescens (gram-negative) and Serratia marcescens (gram-negative). MATERIALS Chemical agent to be tested (5 % iodine and 5 % formaldehyde) Cultures of Pseudomonas fluorescens and Serratia marcescens. Sterile petri dishes Liquid nutrient agar Sterile filter paper disc
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volumetric flask - graduated cylinder -beakers V.Experimental procedure: Reference experiment number 7‚lab manual phar 205‚2012 p.65 . VI.Theory: Rather than titrating directly with iodine‚an excess of iodine will be generated directly in the solution with ascorbic acid according to the following equation: IO3- + 5I- +6H+ → 3I2 + 3H2O Vitamin C is readily oxidized with I2 in acidic medium.
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amylopectin. To test for the presence of starch‚ the Starch Test is used. This is a simple test in which iodine is added to a given solution. If a polysaccharide such as starch is present then the iodine ion will lodge itself in the polysaccharide chain and give it a black-blue color. If iodine added to a solution turns black-blue than starch is present. If the solution remains the color of iodine‚ reddish-orange‚ there is no starch present‚ a negative test. In our experiment we scale the color we see
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Materials : Glucose‚ sucrose ‚ fructose ‚ hydrochloric acid ‚ potassium hydroxide ‚ albumin ‚ cooked starch ‚ corn oil ‚ copper (ll) sulphate solution ‚ ascorbic acid solution ‚ DCPIP solution ‚ Millon’s reagent ‚ Sudan lll ‚ tap water‚ ethanol ‚ iodine solution ‚ Benedict’s solution. Observation : Part One : Identification of Carbohydrates Reducing sugar Test Observation Fructose Colourless fructose solution turned to reddish brown solution. Glutose Colourless glucose solution turned
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Running Head: GRAVES’ DISEASE Graves’ Disease Graves’ Disease Graves’ disease‚ also known as toxic diffuse goiter‚ is the most common cause (80%) of hyperthyroidism in the United States (Rakel & Bope‚ 2008). Hyperthyroidism is a hypermetabolic disorder that occurs when the thyroid gland makes more thyroid hormone than the body needs (Nettina‚ 2006). Over activity of the thyroid gland leads to high levels of thyroid
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fundamental resource needed for photosynthesis. 4. If the plant is kept in the presence of light‚air‚soil‚and water‚ then the plant will have a starch level of 3 because it has all of the necessary environmental conditions. Materials: safety goggles iodine solution petri dishes razor blade forceps beakers trays potting soil plastic lids 95% ethyl alcohol sodium hydroxide medicine cups Procedures: 1. Compare the plants in each tray(characteristics) 2. Label petri dishes dark‚ closed‚ normal‚ closed
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