What is the principle involved in the Dinitro salicylic (DNS) colorimetric method?
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- What is the principle involved in the Dinitro salicylic (DNS) colorimetric method?
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- The original concentration in a sample of kombucha is 2.79 x 10^6 CFU/ml. Which dilution would yield a countable plate? How would you make this? Show your calculations. Confused as to what's implied by "which dilution"? does it mean, how many times?The data from thin layer chromatographic separation of analgesics showed ibuprofen distance to be 0.752 mm. If the solvent distance is 1.85 mm. Calculate the retention factor for Ibuprofen?Explain the mechanism of denaturation for the following agent: 1. Hydrochloric acid 2. Lead (II) acetate solution 3. Picric acid 4. Nitric acid 5. Ethanol
- What is the role of imidazole in Ni-Affinity Chromatography?Using the formula V₁D₁ = V₂D2, what volume of a 1/100 (10-2) dilution would you need to produce 100 mL of a 1/10000 (10-4) dilution? (Note: provide your answer in decimal format to three decimal places.)What is Xanthan ? What is the importance of using Xanthan in the emulsion experiment?
- The standard curve to determine the amount of betacyanin is shown below. You extracted a red pigment from a beet disc (the mass of a disc is 2 g) using 10 ml of 20% ethanol solution. You measured absorbance of the solution above the beet disc every minute for a total time of 20 minutes. The increase in absorbance was linear during a period of time from 1 min to 10 min. The absorbance at 10 min was 0.8. Calculate the amount of betacyanin extracted from 1g of a beet tissue per minute. Explain your calculations. You can use Excel or a calculator.A 5% dextrose in 1/2 normal saline (D5 1/2 NS) solution is commonly administered to patients needing post-operative IV fluids. How could you prepare 500 mL of this solution? Dextrose is 5% (m/v) and the NaCl is 0.45% (m/v).Calculate the volume of BSA stock that will be required to make the standard solutions needed to create the BSA standard curve. Be sure to show your work and include the volume of 0.02 M phosphate buffer required to reach a final volume of 1 mL. From a 2,000 μg/mL BSA stock, create 1 mL of each of the following stock solutions in 0.02 M phosphate buffer using individual microcentrifuge tubes: 50 μg/mL, 250 μg/mL, 500 μg/mL, 1,000 μg/mL, 1,250 μg/mL, 1,500 μg/mL. Be sure to properly label all the microcentrifuge tubes before creating the standards.
- Why does eluent strength increase as solvent becomesless polar in reversed-phase chromatography, whereas eluentstrength increases as solvent becomes more polar in normal-phase chromatography? What kind of gradient is used in supercritical fluid chromatography?The following image is a scheme for serial dilutions prepared for spectrophotometric analysis. If the stock solution concentration is 0.05 % (v/v) can you calculate the other tube’s concentrations in % v/v? I've used this with direct dilutions, how would I use this on serial dilutions?If 400 mL of a 20% w/v solution were diluted to 2 L, what would be the finalpercentage strength?