During a mass spectrometry experiment, the spectrum of vascular endothelial growth factor A (VEGF-A) was acquired. The absolute error of VEGF-A, having a mass of 1024.5210 Da was 0.06 Da. Calculate the relative error (ppm).
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- The ppm concentration of Pb2+ in a blood sample were measured with Spectrophotometry. 5.00 mL of a blood sample were taken and this sample gave a signal of 0.301 a.u.. Another 5.00 mL of a blood sample were mixed with 0.50 mL og 1.75 ppm Pb2+. Then, this mixture was diluted to 25.00 mL and this diluted mixture gave a signal of 0.406 a.u.. What is the ppm concentration of a blood sample?The standard curve of a biuret assay gave the equation: y=0.4193x. The absorbance for Unknown A = 0.098 and Unknown B = 0.325. Are you equally confident in the accuracy of the protein %D concentrations you would calculate for samples Unknown A and Unknown B? Briefly explain your answer.What kind of chromatography would you for purification of full length antibody ?
- (2) Adenine has a molar absorbance of 4 13.1 M-1cm-1 for 263 nm nucleic acid. What is the molar concentration of an acid solution that shows a permeability of 75% when 2 ml of it is placed in an absorption cell with a thickness of 1 cm?Q24) Consider the following data obtained from the size exclusion chromatography of polypropylene, which was made from propylene of molecular weight 42.08 g/mol. S.No. Number of Molecular Weight Molecules Range (g/mol) 5 8,000 - 16,000 16 16,000 - 24.000 3. 24 24,000 - 32,000 4 28 32,000 - 40,000 5 20 40,000 - 48,000 48,000 – 56,000 From the above data, determine a) Number average molecular weight (M). b) Weight average molecular weight ( Mw). c) Degree of polymerization (DP)1) Study the chromatograph (below) of a mixture of Compounds A and B, run on the GCs in the teaching labs at CU Boulder. Compound A has the shorter retention time. STAAT 61 1.11 227 RT TYPE AREA XXXX XXXX XXXX AREAS 0.009 55874 44.117 ARIHT 0.61 XX XX XX 1.11 2.27 XX XX XX TOTAL AREA=XX MUL FACTOR=XX 1. What is the retention time of compound A? Compound B? 2. Which compound is present in a larger amount? 3. Which compound has the lower boiling point? 4. What would happen to the retention times of compounds A and B if the column temperature were raised? 5. You suspect that compound B is octane. What can you do to provide supporting evidence for this hypothesis?
- In a mixture of the five proteins listed below, which should elute second in size- exclusion (gel- filtration) chromatography? A) cytochrome c B) ribonuclease A C) immunoglobulin G D) RNA polymerase E) serum albumin M. = 13,000 Da M. = 13,700 Da M. = 145,000 Da M. = 450,000 Da M. = 68,500 DaSPECTROPHOTOMETRY 1.) Slope of regression line or Molar absorptivity (µM -1cm-1) is 0.0253 and absorbance of unknown solution is 0.131. What is the concentration of the unknown solution (µM )?A student weighed out 0.150 g of protein powder and dissolved it in 100 mL of water (Solution 1). The student then diluted this solution by transferring 1 mL into a 25 mL flask and diluting with water (Solution 2). Finally, 1 mL of that solution was transferred to a test tube and combined with 4 mL Bradford reagent. The absorbance of the solution in the test tube was 0.144. Assuming that the best fit linear line of the standard curve was y=0.04144x+0.01521 (μgmL), calculate the percent protein by mass in the original protein powder.
- A student weighed out 0.150 g of protein powder and dissolved it in 100 mL of water (Solution 1). The student then diluted this solution by transferring 1 mL into a 25 mL flask and diluting with water (Solution 2). Finally, 1 mL of that solution was transferred to a test tube and combined with 4 mL Bradford reagent. The absorbance of the solution in the test tube was 0.187. Assuming that the best fit linear line of the standard curve was y = 0.04144 x + 0.01521 (μ g mL), calculate the percent protein by mass in the original protein powder.In a Bradford assay, 17 pl of a protein isolate sample was diluted by adding 24 pl of water prior to the addition 2.0 mL Bradford reagent, Calculate the protein concentration (in mg/ml) of the original protein isolate sample whose absorbance reading at 595 nm is 0,384 after dilution The protein standard solutions used for the calibration curve of the Bradford assay was constructed using bovine serum albumin (BSA) stock solution whose concentration is 200 ug/mL The concentration and the corresponding absorbance reading at 595 nm of the protein standard solutions are summarized in the table below: Standard soln # 3 6 conc of BSA Kug/mL) 12.00 24.00 36.00 48.00 60.00 Absorbance lat 595 nm 0.000 0.156 0.249 0.328 0.411 0.528 zNote: Final answer format must be x.xox (three decimal places) Round off only in the final answer. Do not round off in the middle of the calculationin the determination of Keq in spectrophotometry, why is it that [KSCN] is lower in the preparation of unknown solutions.