When water and oil in the presence of an emulsifying agent are mixed, they do not separate. Why? What is the pH of tears? Why should ophthalmic preparations have pH close to that of tears? What is a buffer capacity or buffer value? What is the role of gall bladder in the emulsification of fats?
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- When water and oil in the presence of an emulsifying agent are mixed, they do not separate. Why?
-
What is the pH of tears? Why should ophthalmic preparations have pH close to that of tears?
-
What is a buffer capacity or buffer value?
-
What is the role of gall bladder in the emulsification of fats?
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- Consider the following prescription: Sol silver nitrate 0.5% 15mL Make solution isotonic for ophthalmic use. B. How many milligrams of potassium nitrate will need to be added to the prescription to make it isotonic? Report numerical value only rounded to a whole number. Need only handwritten solution only (not typed one).What makes transparent softening lotion different from suspension softening lotion? Is it because of capric triglyceride makes it suspension?Briefly explain why alpha-linolenic acid is essential.
- What is the volume of sterilized distilled water (in milliliters) that should be added to the preparation to make it isotonic with tears?Show the chemical equations of the following lipid tests: (1) acrolein test, (2) saponification, (3) translucent test, and (4) emulsification.Which among the general tests for alkaloids can be used as a visualizing agent in detecting alkaloids at TLC chromatogram? Explain.
- 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.Using the sodium chloride equivalent method, make the following solution isotonic with respect to the mucous lining of the eye (ocular membrane): Tetracycline hydrochloride: 10 g NaCl: x g Sterile distilled water, enough to make 1000 mL Report your answer in grams (to one decimal place).What is emulsification? What is the purpose of alcoholic potash in saponification? Why are fats soluble in organic solvents but not in water?
- What is the absorption peak(s) of methyl orange? Make sure to write down the wavelength at which the absorption peak(s) occur. Include units, please What color(s) does methyl orange absorb the best?What are the merits and demerits of aspirin over salicylic acid? Explain at your own wordsIf we wanted to measure the BSA absorbance without the Biuret reagent, which wavelength would we use and why?