Question

The refractometer method used by fruit processing industries for jam making is done to show:

• A. % TSS
• B. $^\circ$Brix
• C. $^\circ$C
• D. %RH

Hint:

Refractometer = Sugar measurement → always think $^\circ$Brix.

Answer 1

The Correct Option is B

Concept: A refractometer is an instrument used to measure the refractive index of a solution, which is directly related to the concentration of dissolved solids, primarily sugars in fruit products. In fruit processing industries, especially for jam making, this measurement is expressed in terms of degrees Brix ($^\circ$Brix).

Step 1: Understanding refractive index.
When light passes from one medium to another, it bends. This bending depends on the concentration of solutes present. Higher sugar concentration leads to higher refractive index.

Step 2: What is $^\circ$Brix?
$^\circ$Brix represents:
• Grams of sucrose per 100 grams of solution
• It is a direct indicator of sugar content

Step 3: Application in jam making.
In jam production:
• Desired consistency and preservation depend on sugar concentration
• Standard jam typically contains around 65–68$^\circ$Brix Thus, refractometer is used to measure $^\circ$Brix.

Step 4: Evaluating options.
• %TSS — Total soluble solids is related, but refractometer directly reads in $^\circ$Brix
• $^\circ$Brix — Correct unit used in refractometry
• $^\circ$C — Temperature, not relevant
• %RH — Relative humidity, unrelated Final Conclusion:
Refractometer readings in jam making are expressed in $^\circ$Brix. Hence, the correct answer is option (2).