Lecture 3: Tritable acidity

Question 1

what is the importance of acidity analysis in food?

Answer 1

Acidity has an impact on taste and can indicate food quality

Organic acids present in food influence the flavour, color, microbial stability, and keeping quality

Question 2

What is titratble acidity?

Answer 2

sum of all the free mineral and organic acids in the food, so gives a measure of all the acids in the in the food

Question 3

What does titratable acidity give an indication of?

Answer 3

• can predict acids impact on flavor
• gives an indication of quality

Question 4

What happens during a titration of total acidity?

Answer 4

A strong base is added to neautrilze the free ions, in order to maintain the certain pH the buffer system will release more hydrogen ions. At some point all the acids will have dissociated and reacted so the buffering power is done and now the titratble aciidty can be calculated

Question 5

An example of the use of acidity titration is in measuring the acidity of fresh milk, why is it important?

Answer 5

indicates quality since it is possible for fermantion of lactose to lactic acid by bacteria present in upasterized milk

Question 6

How many carboxylic groups do most acids have and what is the one that has three?

Answer 6

• most have 1
• citric acid has three

Question 7

Define pH

Answer 7

pH= -log[H+]

logrithrim of the inverse of hydrogen concentration which is equal to negative log of the molar hydrogen ion []

Question 8

what property does the pH of food affect?

Answer 8

organolpetic property

Question 9

what method is used to determine pH?

Answer 9

pH meter, pair of electrodes that measure the voltage between them and result into a coressponding pH value