Q.107
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : Bioavailability of lycopene in cooked or processed tomatoes is greater than in raw.
Reason (R) : All trans form of lycopene isomers are more bioavailable than cis isomers.
In light of the above statements, choose the correct answer from the options given below.
EXPLANATION
Biochemistry of Stored Vegetables: Carbohydrates, Proteins, Glucosinolates and Enzymatic Changes
- Assertion (A) is True: Lycopene bioavailability from processed or thermally cooked tomato products (tomato paste, puree, sauce) is significantly higher ($2 - 3\times$) than from raw fresh tomatoes.
- Reason (R) is False: Thermal processing induces isomerization of all-trans lycopene into cis-isomers.
- Cis-isomers of lycopene are MORE bioavailable than all-trans isomers because cis-isomers possess a bent conformation that reduces aggregation, enhances solubility in oil, and facilitates incorporation into bile acid mixed micelles for intestinal absorption.
- Therefore, the assertion that "all trans form are more bioavailable than cis isomers" is scientifically false.
- Conclusion: Assertion (A) is true but Reason (R) is false (Option 3).
Correct option: (3) (A) is true but (R) is false
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