A Bradford assay was carried out to measure protein concentration. The absorbance of five standard samples...
A Bradford assay was carried out to measure protein concentration. The absorbance of five standard samples and two unknown samples are listed in the table below. The Bradford reaction mixture (1 ml) was prepared as follows: 100 μl sample A or sample B + 200 μl Bradford reagent + 700μl 0.9% NaCl solution
| sample ID | concentration (mM) | absorbance (O.D.) |
| std 1 | 100 | 0.78 |
|
std 2 |
50 | 0.4 |
| std 3 | 25 | 0.18 |
| std 4 | 12.5 | 0.08 |
| std 5 | 0 | 0 |
| unknown sample A | unknown | 0.56 |
| unknown sample B | unknown | 0.11 |
Make a standard curve using the absorbance (O.D.) as the x axis and the concentration (mM) as the y axis. Find the equation of the standard curve.
hint: (1) follow the instruction regarding which number should be on the x or y axis; (2) unknown sample A and B were diluted in the process of preparing the Bradford reaction. To figure out the original concentration in Q3 and Q4, you need to figure out the concentration and the volume of the diluted solution first ( = bradford reaction).
This question was already on chegg but the mm were wrong for a and b. please read the hint.
Homework Answers
Add Answer to:
A Bradford assay was carried out to measure protein
concentration. The absorbance of five standard samples...
1. You have generated the following standard curve after a Bradford Assay to measure Absorbance vs...
1. You have generated the following standard curve after a Bradford Assay to measure Absorbance vs samples of known BSA concentrations. Now you need to determine the amount of protein in two mitochondria samples taken from fish, one taken from fish under normal conditions and the other taken from fish under oxidative stress. The absorbance reading for the normal fish fraction was A595=175, and the absorbance reading for the stressed fish fraction was A595= 275 Bradford Assay Standard Curve y...
In biochemistry, we use a 'Bradford Assay' to calculate the concentration of protein in a sample....
In biochemistry, we use a 'Bradford Assay' to calculate the concentration of protein in a sample. This method uses the same principles of the standard curve from this experiment. In a Bradford Assay, a standard curve is prepared using a known protein, typically Bovine Serum Albumin (BSA), but rather than measuring the density, we can measure a different property - its 'absorbance'. The graph below is representative of a standard curve from a Bradford Assay (with the line equation displayed...
4. Bradford assay. In your prac you used the Bradford assay to determine the protein concentration...
4. Bradford assay. In your prac you used the Bradford assay to determine the protein concentration (1.5 marks) a) Explain at a molecular level how the color development of the assay works. Answer must be less than 100 words. (0.5 marks) b) Explain why you can use Bovine Serum Albumin as standard protein to determine the concentration of milk proteins. Answer must be less than 50 words. (0.5 marks) c) Why is it important to use diluted milk fraction samples...
2.(1 point) You have 125 μLof a protein sample. Of this, you dilute30μLinto 120μLof buffer. 50μL...
2.(1 point) You have 125 μLof a protein sample. Of this, you dilute30μLinto 120μLof buffer. 50μL of that dilution were used for a Bradford assay and produced an absorbance of 0.53.Using the standard curveyou built in the lab using BSA, find the protein concentration (in μg/μL) of the original protein sample. Show your work. (Hint: first find the dilution fold of the sample that was used for the assay.) Note: equation from standard curve: y=0.0093x + 0.1877 show all work.
I forgot to put down that the observance (=OD) at 280nm is 0.679A Experiment 8: Bradford...
I forgot to put down that the observance (=OD) at 280nm is
0.679A
Experiment 8: Bradford assay and UV-method for determination of protein concentrations Materials - An ice bucket with ice, your purified sample, three visible plastic cuvettes for Bradford assay, one UV plastic cuvette for UV-method, a piece of parafilm, a Vis-spec, a Lab Quest, Bradford reagent, white tape (share), a sharpie. Bradford assay (reference 21) 1. Add 990 uk Bradford assay reagent to a plastic cuvette 2. Blank...
A Bill' external standard curve built from absorbance signal vs. analyte concentration (in uM) has the...
A Bill' external standard curve built from absorbance signal vs. analyte concentration (in uM) has the following calibration curve equation y = 0.0500 x + 0.003. If a sample produced an absorbance of 0.300, what was the Bi concentration in the solution in the cuvette? A. 0.015 mM B. 6.00 mm c. 5.94 mm D. 0.600 mm Reset Selection estion 4 of 5 2 Points If the concentration of Bi in a diluted sample (after dilution of the original sample)...
They performed a BSA assay to determine the concentration of an unknown solution X. The graph...
They performed a BSA assay to determine the concentration of an unknown solution X. The graph below is the BSA standard curve. In the cuvette, you add 25 ul of the unknown solution X, 200 ul of the Bradford’s reagent and 775 ul dH2O. You obtain an absorbance of 0.58 at 595nm. Use all the information to calculate the concentration of the unknown solution X. Show work Y- 0.0457x R^2- 0.9901
You use the Bradford (coomassie) assay to determine the concentration of Protein A. You use bovine...
You use the Bradford (coomassie) assay to determine the concentration of Protein A. You use bovine albumin as your standard. You determine the Protein A concentration to be 2 mg/ml. When you use Protein A as your standard, you determine the Protein A concentation of your unknown to be 3 mg/ml. Explain the discrepancy (pick ONE answer): (2 points) a. Protein A has fewer basic amino acids than albumin. b. Protein A has more acidic amino acids than albumin c....
In lab, you diluted your unknown protein solution by combining 14 ?L of unknown protein solution...
In lab, you diluted your unknown protein solution by combining
14 ?L of unknown protein solution with enough
PBS buffer to obtain a total volume of 100 ?L, then added 1000 ?L Bradford reagent. After waiting ten
minutes, the absorbance at 595 nm was 0.206. Using the standard
curve from the previous question, calculate the total concentration
of protein (in ?gmL) in the original sample.
Slope = 0.02371 Intercept = 0.01132 r2
= 0.973
Answer 2) To measure the concentration of phosphorous in a water sample, Phosphorous was first converted...
Answer
2) To measure the concentration of phosphorous in a water sample, Phosphorous was first converted into a color complex in the presence of ammonium molybdate and SnClo. The absorbance of a series of standard phosphorous solutions was measured by a spectrophotometer and gave the calibration curve y 1.150 x, where y is the absorbance of phosphorous complex at 690 nm while x is the concentration of P in ppm. An unknown natural water sample was collected. 10.00 mL of...
1. You have generated the following standard curve after a Bradford Assay to measure Absorbance vs samples of known BSA concentrations. Now you need to determine the amount of protein in two mitochondria samples taken from fish, one taken from fish under normal conditions and the other taken from fish under oxidative stress. The absorbance reading for the normal fish fraction was A595=175, and the absorbance reading for the stressed fish fraction was A595= 275 Bradford Assay Standard Curve y...
In biochemistry, we use a 'Bradford Assay' to calculate the concentration of protein in a sample. This method uses the same principles of the standard curve from this experiment. In a Bradford Assay, a standard curve is prepared using a known protein, typically Bovine Serum Albumin (BSA), but rather than measuring the density, we can measure a different property - its 'absorbance'. The graph below is representative of a standard curve from a Bradford Assay (with the line equation displayed...
I forgot to put down that the observance (=OD) at 280nm is
0.679A
Experiment 8: Bradford assay and UV-method for determination of protein concentrations Materials - An ice bucket with ice, your purified sample, three visible plastic cuvettes for Bradford assay, one UV plastic cuvette for UV-method, a piece of parafilm, a Vis-spec, a Lab Quest, Bradford reagent, white tape (share), a sharpie. Bradford assay (reference 21) 1. Add 990 uk Bradford assay reagent to a plastic cuvette 2. Blank...
A Bill' external standard curve built from absorbance signal vs. analyte concentration (in uM) has the following calibration curve equation y = 0.0500 x + 0.003. If a sample produced an absorbance of 0.300, what was the Bi concentration in the solution in the cuvette? A. 0.015 mM B. 6.00 mm c. 5.94 mm D. 0.600 mm Reset Selection estion 4 of 5 2 Points If the concentration of Bi in a diluted sample (after dilution of the original sample)...
In lab, you diluted your unknown protein solution by combining
14 ?L of unknown protein solution with enough
PBS buffer to obtain a total volume of 100 ?L, then added 1000 ?L Bradford reagent. After waiting ten
minutes, the absorbance at 595 nm was 0.206. Using the standard
curve from the previous question, calculate the total concentration
of protein (in ?gmL) in the original sample.
Slope = 0.02371 Intercept = 0.01132 r2
= 0.973
Answer
2) To measure the concentration of phosphorous in a water sample, Phosphorous was first converted into a color complex in the presence of ammonium molybdate and SnClo. The absorbance of a series of standard phosphorous solutions was measured by a spectrophotometer and gave the calibration curve y 1.150 x, where y is the absorbance of phosphorous complex at 690 nm while x is the concentration of P in ppm. An unknown natural water sample was collected. 10.00 mL of...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 11 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 11 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 11 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 11 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 11 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 11 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 11 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 11 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 11 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 11 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 11 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 11 months ago