Bio Lab Report

Ye Tao BISC220-13155 The Effect of Temperature on the Digestion of starch by Activity of Enzyme ? -Amylase Observation of Rate of Starch Disappearance done Iodine Test Introduction An enzyme is a type of protein that, through its own structure including hydrogen bonds, acts like a biological catalyst and is able to hie the biochemical reply rate by lowering the activation brawn of the whole process, without which cells could hardly practice any physiological functions within human bodies (Sizer, 1943).Found in the saliva and pancreatic secretions of animals including human beings as well as the plant ensureds, bacteria and fungi (Siddiqui et al. , 2010), the enzyme ? -amylase that was studied during the investigate has signifi coffin nailt impact on the hydrolysis of starch. By breaking the alpha, 1-4 glycosidic linkages in the carbohydrates, amylase hydrolyzes the starch, a polysaccharides that is stored in plants and cannot be at a time digested by animal cells, into maltose , a disaccharide that later generate deuce units of glucose to undergo metabolisms and provides necessary energy (Slaughter et al. , 2001). The enzymatic activity of ? amylase is facilitated by calcium and chloride ions during the hydrolysis (Marini, 2006 and Siddiqui et al. , 2010). The complete digestion of starch and formation of maltose and glucose can be examined through the iodine mental test when I2KI reagent is added into the resolving and cadaver brown instead of turning into dark blue, marking that all the molecules of starch have been fully hydrolyzed (Hanes, 1932). While amylase effectively activates the hydrolysis of starch, the efficiency of the catalytic process is influenced by several factors including temperature, pH level and the concentration of the substrates etc.In this experiment, as the ? -amylase is a type of protein, the efficiency of enzyme is highly related to its hydrogen bonds which are affected by the temperature. though the enzyme is collected from the porcine pancreas, due to its structural similarities to amylase in human bodies, the behaviors of two amylases should resemble from each one other. Given that under extreme temperature enzymes will be change and unable to function and the constant temperature of pigs is around 39C, the hypothesis of this experiment is that at 37C amylase will catalyze the hydrolysis with the highest speed, followed by amylase at 22C.Amylase at 0C will react extremely slowly due to the crystallization of hydrogen bonds and at100C, amylase will lose its function since it will be denatured. Materials and Methods Four test tubes were marked from A1 to A4. Then, 2mL of 1% starch solution from Carolina Biological Supply Company, 4mL of deionized water and 1mL of 6. 8 hydrion buffer from VWR International/ Micro Essential Laboratories were added into each tube. Another four test tubes were also research laboratoryeled from B1 to B4 and added 1mL of 1% ? -amylase from porcine pancreas from Sigma Aldr ich. Eight tubes were paired according to the aforementioned(prenominal) number (A1and B1 etc. and assigned to environments at different temperature Tube A1 and B1 were placed into a water bath at 100C Tube A2 and B2 were placed into a water bath at 37C Tube A3 and B3were placed on the tube rack (at about 22C) Tube A4 and B4 were placed into an ice bath at 0C. All test tubes were kept at different temperatures for 10 minutes. Meanwhile, a control group of starch solution was prepared without amylase. (Bio Lab Manual, 2013) At the said(prenominal) time, a test plate was added 2 drops of I2KI reagent (1% Iodine and 2% KI) from Carolina Biological Supply Company per well.After 10 minutes, when test tubes were still in the professional environments, solutions in Tube A1 with B1 were mixed and a timer was started. At each 30-second-inteval, a drop of the mixture was released into the well on the test plate until the solution in the plate did not change into dark blue and remained brown , indicating the end of the reaction by showing no presence of starch and presence of maltose and glucose. The experiment was plagiarizeed on the tubes at other temperatures. Slow reactions were observed and recorded up to 420 seconds due to time limit.Data were pooled from each bench and average and standard conflict were calculated. The data of the control group were also obtained. Results Figure 1 The test plate of iodine test under different temperature. Dark blue well indicated the presence of starch while the brown ones indicate the completion of starch hydrolysis. (Upper half 37C Bottom Half 0C) The rate of reaction was fastest at 37C (n=4, average=212. 5s, SD=66. 1s) while the rate of reaction at 22C was only slightly less than it (n=4, mean=217. 5s, SD=61. 8s).Though the previous two groups underwent starch hydrolysis relatively fast, the tubes at 100C and 0C reacted so slowly that it took more than 420 seconds for their completions (time was only recorded earlier 420s) . There was no hydrolysis in the control group. The time of the reaction completions as the function of different temperatures was shown in the table and graph below. The Effects of Temperature Temperature (? ) Time of Starch Disappearance(s) Bench 1 Bench 2 Bench 3 Bench 4 Mean SD Control 420 420 420 420 420 0 0 420 420 420 420 420 0 2 210 210 three hundred 150 217. 5 61. 84658 37 270 180 265 135 212. 5 66. 14378 100 420 420 420 420 420 0 Table 1. Time of Starch Disappearance with Porcine Pancreatic ? -Amylase at Different Temperatures (Time was recorded up to 420s). Graph 1. Time of 1% Starch Disappearance with Porcine Pancreatic ? -Amylase as the Function of Different Temperature Discussion and final result As the data obtained from the experiment, all parts of the captain hypothesis were confirmed by the result. Temperature plays an important role during the activation of ? amylase that only during certain temperature range can the enzyme function properly to catalyze bioc hemical reactions. On one hand, at 37C the amylase showed the greatest efficiency in catalyze the hydrolysis of starch. At the same time, the amylase also showed considerable catalytic efficiency at 22C. But on the other hand, when temperature dropped or rose to extreme value such as 0C or 100C, the function of amylase was inhibited and such biochemical transformation of substances could hardly process. This result obtained is consistent with the reality that during normal torso temperature, regardless of pig or human beings, mylase is able to catalyze the hydrolysis of starch with the highest speed. Therefore, we may conclude that even taken out from where it was found, the amylase still maintain its original biochemical properties. The experiment did not show the biochemical mechanism of the modification from temperature to amylase activity. However, according to the scientific research done by other scientists, a temperature that ranges from 20-50C could make structures includ ing weak interactions, hydrogen bonds and disulfide bridge exist within and stabilize the enzyme molecules to maximize their activities.At the water freezing point (0C), the hydrogen bonds are crystallized and bring forth more constrained and less flexible while at high temperature like 100C, the bonds consume certain energy to become unstable and fragile, uncomplete of which contribute to the proper functions of amylase (DAmico et al. , 2003). While the result of the experiment perfectly matched what was expected, however, such destination could only be made at qualitative phase and it is overt that weakness of this experiment existed and prevented the further understanding of amylase at quantitative level.Several modifications to the current experimental designs could be made to enhance its accuracy. Firstly, the sample size needs to be expanded. With only four groups, the data was so limited. As a result, the data had great standard deviations of more than 60 seconds. Simulta neously, the random errors were at high surmise to take place. Therefore, with the increase of sample size, the data can be more accurate and stabilized and potential random errors could be discarded to ensure the coherency of the data.Furthermore, even though neither the test tube at 0C and 100C enabled the completions of starch hydrolysis, the reasons of the two groups are not the same. Therefore, in order to detect the reason of the loss of catalytic ability, follow-up experiments need to be practiced. A possible design might be to change the test tubes from 0C or 100C into 37C for another 10 minutes then redo the iodine test to see this time whether the amylase can function well or not.This manipulation will convince the hypothesis about the reason behind the superficial phenomena that was shown in the original experiments and present the difference between denaturing of protein and crystallization of hydrogen bonds. It is important for people to thoroughly understand the amyl ase activity and all the factors that are potentially capable of influencing such activity through which people can understand how human bodies work as well as the physiology of other organisms. At the same time, the research in amylase activity could potentially bring economical benefits to industrialized starch products manufacturing.And finally, the amylase activity has shown its significance in medical clinical trial that diseases including hyperamylasemiaor hyperamylasuria are turn up to be related to the amylase in the human serum and urines (Salt 2nd, 1976). References General Biology BISC 220 Laboratory Manual. (2013). University of Southern California. Lab2, pp33-36. DAmico, S. , Gerday, C. , Feller, G. (2003). Temperature adaptation of proteins engineering mesophilic-like activity and stability in a cold-adapted ? -amylase. Journal of molecular biology,332(5), 981-988. Hanes, C.S. (1932). Studies on plant amylases The effect of starch concentration upon the velocity of h ydrolysis by the amylase of germinated barley. Biochemical Journal,26(5), 1406. Marini, I. (2005). Discovering an accessible enzyme Salivary amylase Prima digestio fit in ore A didactic approach for high school students. Biochemistry and Molecular Biology Education,33(2), 112-116. Salt 2nd, W. B. , Schenker, S. T. E. V. E. N. (1976). Amylaseits clinical significance a review of the literature. Medicine,55(4), 269. Siddiqui, Z. S. , & Khan, M. A. 2011). The role of enzyme amylase in two germinating seed morphs of Halopyrum mucronatum (L. ) Stapf. in saline and non-saline environment. Acta Physiologiae Plantarum,33(4), 1185-1197. Sizer, I. W. (2006). Effects of temperature on enzyme kinetics. Advances in Enzymology and Related Areas of Molecular Biology, Volume 3, 35-62. Slaughter, S. L. , Ellis, P. R. , & Butterworth, P. J. (2001). An investigation of the action of porcine pancreatic ? -amylase on inseparable and gelatinised starches. Biochimica et Biophysica Acta (BBA)-General Su bjects,1525(1), 29-36.Bio Lab ReportBiology lab report Estimating glucose concentration in solution Done by Hasan Al-jowder 11E KC Introduction The purple beg solution of potassium permanganate (MnO4 -) is reduced by glucose to a colourless solution of manganese ions (Mn2+). MnO4- + 8H+ + 5e- Mn2+ + 4H2O The time taken for the loss of colour from a standardised solution of permanganate is directly related to the concentration of glucose present in solution. Research questionHow does the different concentration of glucose solution which have the same volume affects the time taken for the pink color of the potassium permanganate to turn into colorless? Hypothesis The higher the concentration of glucose, the shorter time taken for the reduction of potassium permanganate, hence resulting in shorter time taken for the pink color of potassium permanganate to decolorize. This is because the concentration of glucose molecules in glucose solution is high thus more electron are donated to t he permanganate within a constant period.Variables breakaway The concentration of the glucose solution Dependent The time taken for the pink color of the potassium permanganate to turn into colorless Controlled Volume/Units Materials list Eye protection A timer a glass rod a boiling tube and a rack 3 beakers 3 sprays 6 labels glucose solutions (2%,4%,6%,8%,10%,12%) 3 solution of unappreciated glucose concentration (A,B,C) sulphuric acid potassium permanganate Procedure 1. label your three beakers sulphuric acid PP- for potassium permanganate G- for glucose 2. abel your syringes in the same way. 3. add about 25 cm3 of sulphuric acid and potassium permanganate to the beakers this will be your stock to use throughout the experiment. note which glucose solution you are testing first. 4. use the correct syringe to place 10 cm3 of the first glucose solution into the boiling tube. 5. add 5 cm3 of sulphuric acid. 6. add 2 cm3 of potassium permanganate and start the clock. 7. stir with a aspiration rod and stop the clock as soon as the pink color disappears. 8. record the time and the glucose solution used. . rinse the syringe you used for the glucose solution. 10. repeat employ the other glucose solution. 11. repeat for a solution of unknown concentration (A B or C) 12. record your own results and if possible class average results in a table. Table Glucose concentrationsTime taken to change color 2%1 minute 41 seconds 4%1 minute 13 seconds 6%45 seconds 8%41 seconds 10%35 seconds 12%32 seconds Unknown A48 seconds Unknown B1 minute 13 seconds Unknown C2 minute 56 seconds Graph conclusion Evaluation sources of error= the temperature of the water was not the same with all the concentrations minor inaccuracy in watching the exact time that the color changes absolutely inaccuracy in using the stop watch Reference https//www. google. com. bh/hl=en&sclient=psy-ab&q=estimating+glucose+concentration+in+solution+lab+report+hypothesis&oq=estimating+glucose+concentration+i n+solution+lab+report+hypothesis&gs_l=hp. 3 3351. 18905. 1. 19921. 11. 11. 0. 0. 0. 0. 421. 2839. 2-10j0j1. 11. 0 0. 0 1c. 1. 7. psy-ab. csPQdc8wzZA&pbx=1&bav=on. 2,or. r_cp. r_qf. &bvm=bv. 44011176,d. d2k&fp=34c3fbe89c60be0d&biw=1366&bih=629