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- Biuret Assay accurately quantify protein concentration within the range of 5-150 mg/mL. JUSTIFY THE STATEMENT.In a Bradford assay, 11 µl of a protein isolate sample was diluted by adding 21 µl 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 0.304 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 µg/mL. The concentration and the corresponding absorbance reading at 595 nm of the protein standard solutions are summarized in the table below: Standard soln # 1 2 13 4 6 conc of BSA 12.00 24.00 36.00 48.00 60.00 (pg/mL) Absorbance at 595 nm 0.000 0.156 0.249 0.328 0.411 0.528 zNote: Final answer format must be x.xxx (three decimal places). Round off only in the final answer. Do not round off in the middle of the calculation.A protein consists of two types of peptide chains (A and B) with an unknown stoichiometry (AxBy). When you ran this protein directly on reversed phase-HPLC with UV monitor set at 280 nm, two peaks were resolved. Mass spec determined that the peaks represented Chain A and Chain B, respectively. The peak area is 500,000 for Peak A (Chain A) and 100,000 for Peak B (Chain B). The molecular masses of Chain A and Chain B are 25,000 and 5000, respectively. The extinction coefficients for Chain A and Chain B are 1 mL/mg.cm and 0.5 mL/mg.cm, respectively. Please calculate x/y.
- Q. Determination of hardness by Clark's method.Aliquots of a 0.5 mg/mL standard of BSA were used to construct a standard curve for the Bradford protein assay. The tubes contained the following amounts of the BSA solution: 0, 20, 40, 60, 80, 100 μL. Each sample then had water added to make the final volume 100 μL. The corresponding absorbencies after adding Bradford reagent were the following: 0, 0.05, 0.09, 0.14, 0.19, and 0.22. If you took 20 μL of an unknown and added 80 μL of water, mixed, took 10 μL of the mixture and 90 μL of water and added the Bradford reagent and saw an absorbance of 0.08, what was the protein concentration of the undiluted unknown to one decimal place?B2. 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).
- i) To estimate the accuracy and precision of the method of determination of glucose in a blood sample, blood was spiked with a 88.2 ngml1 of glucose. The amount of glucose was determined in the spiked sample giving the following results in ngml1, 83.6, 69.0, 83.4 100.0 and 76.4. a)Find the accuracy of the quality control sample. b)Find the precision of the quality control sample1) a)What is affinity chromatography and what is it used for? b) A drug called Bamlanivimab is used to treat infections with SARS-CoV-2 (Covid-19).This drug was developed by isolating antibodies from the serum of a patient who recovered from Covid-19.What is possibly on the stationary phase in a column used to isolate antibodies to SARS-CoV-2? How are the antibodies eluted off the column to isolate them for drug development?analyte concentration(C)(mg/ml) injection volume (ul) elution time (time) peak DAD signal(mAU) caffeine 1 1 4.67 302.85 aspartame 5 1 7.53 15.83 benzoic acid 1 1 8.14 89.98 saccharin 1 1 1.91 84.86 mixture(add everything above with 1:1:1:1 ratio) 1 4.47 69.58 How to get the concentration of the mixture in this case?
- If the standard addition intercept is the major source of uncertainty, find the uncertainty in the concentration of Sr in tooth enamel in parts per million. Find the 95% confidence interval for Sr in tooth enamel.22-30. (a) The mean free path is the average distance a molecule travels before colliding with another molecule. The mean free path, A, is given by A = kT/(V20P), where k is Boltzmann’s constant, T is temperature (K), P is pressure (Pa), and o is the collision cross section. For a molecule with a diameter d, the col- lision cross section is nd. The collision cross section is the area swept out by the molecule within which it will strike any other molecule it encounters. The magnetic sector mass spectrometer is maintained at a pressure of ~103 Pa so that ions do not collide with (and deflect) one another as they travel through the mass analyzer. What is the mean free path of a molecule with a diam- eter of 1 nm at 300 K in the mass analyzer?Why is strict implementation of LQMS (Laboratory Quality Management System) or GLP is necessary ? What are the elements ?