as jams and jellies‚ soft drinks‚ pickles‚ condiments etc and in tinned products in the market. This experiment aimed to determine whether benzoic acid is formed from it’s superior soluble form sodium benzoate in stomach acid‚ which is simulated by HCl (pH=2). It has been seen that at a low optimum pH‚ i.e. in the presence of sufficient hydrochloric acid‚ sufficient benzoic acid is yielded. The percentage yield is determined from the calculations of the theoretical (stoichiometric) calculations and
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GROUP No.: | DATE: 02/14/13 | | NAME: | | EXPERIMENT No.25BACILLUS: Diagnostic Tests | | ASCOLI’S THERMOPRECIPITIN TEST Purpose: used to identify anthrax bacilli in animal hides and meat. Principle: This test was designed to detect B. anthracis antigens in the tissues of animals being utilized in animal by-products and thereby to reveal when these products contained ingredients originating from animals that had died of anthrax. The thermostable antigens involved are common to other
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affect the rate of starch digestion measured using starch and iodine? Introduction Amylase is an enzyme found in human saliva and pancreas. It is the digestive enzyme that is needed to breakdown starch molecules. Amylase must be kept at certain conditions to function at its optimum level. This experiment will explore the effect of pH (1‚ 4‚ 7‚ 10‚ and 14) on the function of amylase by using starch and iodine. Usually iodine has a orange-yellow color‚ but iodine and starch react to produce a
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Treating starch How is starch and cellulose treated to allow them to be used by the yeast? (1)Starch is a complex carbohydrate that is insoluble in water. It is supplied by traditional staple foods such as cereals‚ roots and tubers. Starch is used in cooking for thickening foods such as sauce. In industry‚ it is used in the manufacturing of paper‚ textiles and as a mould in the manufacture of sweets such as wine gums and jelly beans. Fermentation (2)As with any food preparation‚ there are
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Secondly‚ I ran a gram stain and found a gram positive‚ cocci bacterium (Table 1‚ Figure 2). Third‚ I ran a catalase test in which was negative (Table 1). From here‚ I determined a starch hydrolysis test would be necessary to distinguish between different bacteria. The result was negative (Table 1). After starch hydrolysis‚ I ran an MSA plate‚ hoping it would give a clear answer as to what the bacterium’s identity was. This result was positive (Table 1‚ Figure 3). The fifth test I ran on unknown A was
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Reaction| A.|NaHCO3 + HCl||Bubbling in center of droplets. Homogeneous| B.|HCl + BTB||Turns yellow immediately after contact. Homogeneous| C.|NH3 + BTB||Turned dark blue. Homogeneous| D.|HCl + blue dye||Solution turns green immediately after contact. Homogeneous| E.|Blue dye + NaOCl||Stays blue. Homogeneous| | with the 1 drop of HCl||Mixes and turns a bluish green color. Homogeneous| F.|NaOCl + KI||Slightly yellowish tint to the solution. Homogeneous| | with 1 drop of starch||Turned the slim yellow
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mL of 3 M HCl. The solution should be a dark yellow to redbrown from the presence of I3 - complex. 4. Titrate the iodine. Rinse the buret with distilled water and then three times with small portions of your 0.10 M sodium thiosulfate solution. Then‚ fill up the buret with the 0.10 M sodium thiosulfate solution. Titrate the bleach-iodine mixture in your Erlenmeyer flask until the iodine color becomes yellow. Add one dropperful of starch solution. The blue/black color of the starch-iodine complex
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and glycogen are three carbohydrates that are similar‚ but structurally different. Carbohydrates have the general molecular formula CH2O. Starch and cellulose are the two most common carbohydrates. Both are polymers (hence "polysaccharides"); that is‚ each is built from repeating units‚ monomers‚ much as a chain is built from its links. The monomers of both starch and cellulose are the same: units of the sugar glucose. Carbohydrates are one of the four major classes of organic compounds in living cells
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Saccharification of Pineapple Ananas comosus peelings through Dilute Acid Hydrolysis Rhoy M. Capul Ma. Michelle Carmel O. Aquino Alia Jenine S. Caceres San Pablo City National High School San Pablo City Mrs. Glory M. Serrano Research Adviser A Science Investigatory Project in fulfillment of Research project S.Y. 2010-2011 Abstract The pineapple is one of the leading products in the Philippines‚ as it thrives in tropical climates. However
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BIO 202 L Dr.Simon Cytochemistry: Animal and Plant Tissues Lab Performed: October 4th‚ 2011 Lab Submitted: November 16th‚ 2011 Day in and day out; Scientist worldwide work closely with various cells to study their functions‚ their components‚ and their complex structures. In Bio 202 one way we’ve learned to examine a cell is by taking advantage of the differences within the chemical reactivity of the molecules located within (Lab Manual‚ Chp. 5). Major biological molecules such as Polysaccharides
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