Photo AI
8. Gelatin is a soluble protein that can be added to different food products - Scottish Highers Chemistry - Question 8 - 2019
Question 8
8. Gelatin is a soluble protein that can be added to different food products. (a) A structure for a section of a protein chain in gelatin is shown. (i) State the n... show full transcript
Worked Solution & Example Answer:8. Gelatin is a soluble protein that can be added to different food products - Scottish Highers Chemistry - Question 8 - 2019
Step 1
Step 2
Step 3
Describe how the student should have made up the solution.
Answer
- The student should first dissolve the gelatin in a small volume of water.
- After dissolving, transfer the solution quantitatively, ensuring to use rinsings and washings to ensure all the gelatin is included.
- Finally, the student should fill the volumetric flask to the mark with distilled water.
Step 4
Step 5
Explain why the rate of hydrolysis is reduced.
Answer
The rate of hydrolysis is reduced because bromelain, an enzyme found in raw pineapple, changes shape or becomes denatured when subjected to heat, such as during cooking. This alteration inhibits its ability to catalyze the hydrolysis of gelatin.
Step 6
Calculate the mass, in g, of this pineapple that would be needed to provide 500 mg of bromelain.
Answer
Given that the flesh of a pineapple contains between 13 mg and 29 mg of bromelain per gram, to calculate the mass of pineapple needed for 500 mg of bromelain, we can set up the following:
Using the lower limit (13 mg/g):
ightarrow 38.46 ext{ g}$$ Using the upper limit (29 mg/g): $$ rac{500 ext{ mg}}{29 ext{ mg/g}} ightarrow 17.24 ext{ g}$$ Thus, between approximately 17.24 g and 38.46 g of pineapple would be needed to provide 500 mg of bromelain.