EXPERIMENT NO. 12 DIGESTION IN THE STOMACH ABSTRACT____________________________________________________________________________ Digestion refers to the mechanical and chemical breakdown of food into smaller components that can undergo absorption. The objective of this experiment is to investigate mainly the process of digestion in the stomach. The conditions at which the enzymes responsible for the digestion process were determined. Also‚ the total and free acidity of gastric juice of the sample
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Biruiet Test: Procedure Instead of the Biuret Reagent‚ the following may be used: * Fehling’s Solutions A and B * Sodium hydroxide and copper (II) sulphate solutions 1. Add 2 cm3 of the liquid food sample* to a clean‚ dry test tube 2. Add 2 cm3 of Biuret Reagent. Alternatively: * Use sodium hydroxide solution and copper sulphate solution instead. Add 1 cm3 of sodium hydroxide solution (40% or bench solution) and 1% copper (II) sulphate solution dropwise – drop by drop - to
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Note: This text is made available courtesy of the Massachusetts Water Resources Authority. We have scanned in the original manual pages and converted the files to text. Unfortunately‚ the pictures were lost and there are some irregularities in the formatting. Our apologies for the inconvenience. TEST 7: TURBIDITY Brief Summary The measure of water’s cloudiness. This test measures turbidity by comparing a turbid sample with a clear sample‚ then adding drops of a special clouding solution to the
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This change occurred because the concentration of the acid and base increased. The observed temperature change in experiment 4 was 3.30 °C‚ which was half of the one that was given to the team. This change occurred because the amount of the limiting reagent in this experiment is half of the one that was given to the team. The observed change in experiment 5 was 7.05 °C‚ which was slightly higher than the one that was given to the team because a different acid was used with different
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Macromolecular Composition of the Liver Cell Formal Report Aims The aim of the experiment was to test for the presence of DNA‚ RNA‚ protein and glycogen in the cytoplasm and the nucleus of bovine liver cells. From the findings of the results the distribution of these macromolecules can be shown within the liver cell. This was carried out by undertaking qualitative experiments‚ where the observation of a colour change was noted and a quantitative experiment‚ where numerical data was recorded from
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to predict whether the reagents would cause an SN1 mechanism‚ SN2 mechanism‚ or both. When predicting the outcome of SN1 and SN2 reactions‚ the nature of the carbon skeleton‚ nature of the solvent‚ and the nature of the leaving group are all taken into account. The experiment called for a two part reaction‚ sodium iodide in acetone (SN2) and silver nitrate in ethanol (SN1). A series of 8 test tubes were each filled with a different substrate to be tested by these two reagents. Approximately 4 drops
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Specimen *Insert procedure here* Reagents are serological purposes are purchased as pre-packed kits. The antigen suspension is in a dropper bottle that delivers a requisive quality. The kit also contains buffer and other accessories required for performing the test. Saline (85% NaCl w/ deinonized water) is the only reagent prepared by the laboratory. Serological tests are done in two ways Slide method-Requires plate w/circles(wells) where the reagent in mixed Agglutination of flocculation
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team searched for the presence of starch‚ glucose‚ lipids‚ and proteins through the use of indicators: Sudan III‚ Lugol’s iodine‚ Benedict’s solution‚ and Biuret’s reagent. After testing the gelatin solution in the presence of the indicators‚ the results showed that Lugol’s reacted‚ turning orange-pink (oils) and the Biuret reagent (protein) reacted with the gelatin solution‚ turning lilac. Thus it was determined that the gelatin solution held both proteins as well as oils. Introduction: Lipids
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the rest retain the purplish color of KMnO4. On the other hand‚ the five compounds in Bromine test with light reacted positively. In Bromine test dark‚ Hexane and Unknown hydrocarbon 1 did not react because light (UV) is absent. Lastly‚ in Tollen’s reagent‚ only Acetylene reacted positively and all the other compounds gave a negative result since they are all hydrocarbons. INTRODUCTION Hydrocarbons are simple organic compounds with a distinct character of having Carbon and Hydrogen atoms only
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The Synthesis of Organic Aspirin ABSTRACT: The purpose of this experiment was to find out how a reaction undergoes for a globally known painkiller called aspirin‚ and to become familiar with achieving successful yields. Aspirin is synthesized from salicylic acid and acetic anhydride. Those two chemicals are mixed together along with sulfuric acid to form a crude solid. Filtration is used separate the impurities from the crude aspirin. To get purified aspirin‚ the precipitate was heated until all
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