Question

Match List-I with List-II choosing the most appropriate options.
List-I (Maillard Reaction Products) & List-II (Impact)
(A) Melanoidins & (I) Flavour
(B) Hydroxy Methyl Furfural & (II) Colour
(C) Cross-linked proteins & (III) Nutrition
(D) Lysine-glucose complex & (IV) Solubility

Choose the correct answer from the options given below:

• (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
• (A) - (II), (B) - (I), (C) - (IV), (D) - (III)
• (A) - (I), (B) - (II), (C) - (IV), (D) - (III)
• (A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Hint:

To remember Maillard reaction product impacts:
- Melanoidins = Final stage brown polymers $\rightarrow$ Colour.
- HMF = Dehydration intermediate $\rightarrow$ caramelized Flavour.
- Cross-linking = Giant protein networks $\rightarrow$ loss of Solubility.
- Lysine blockage = Essential amino acid loss $\rightarrow$ reduced Nutrition.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The Maillard reaction is a non-enzymatic browning reaction between the carbonyl group of reducing sugars (like lactose) and the nucleophilic amino group of amino acids or proteins (especially the \(\epsilon\)-amino group of lysine).
This reaction occurs during the heat processing and storage of dairy products, producing intermediate and final products that alter the flavor, color, solubility, and nutritional value of the milk.

Step 2: Detailed Explanation:
Let us analyze each Maillard reaction product in List-I and match it with its primary physical or chemical impact in List-II:
1. Melanoidins matches with Colour (II):
Melanoidins are brown, nitrogenous, high-molecular-weight polymers formed in the final stage of the Maillard reaction.
They are directly responsible for the brown color of sterilized milk, dulce de leche, and over-processed milk powders.
2. Hydroxy Methyl Furfural (HMF) matches with Flavour (I):
HMF is an intermediate dehydration product of the Maillard reaction.
It is associated with the development of cooked, caramelized, and starchy off-flavors in heated dairy products.
3. Cross-linked proteins matches with Solubility (IV):
During advanced stages of the Maillard reaction, reactive dicarbonyl intermediates cross-link adjacent protein chains.
This cross-linking creates large, insoluble protein aggregates, significantly reducing the solubility and reconstitutability of milk powders.
4. Lysine-glucose complex matches with Nutrition (III):
The early stage of the Maillard reaction involves the condensation of lactose or glucose with the essential amino acid lysine, forming lactulosyl-lysine or fructosyl-lysine.
Because these complexes cannot be cleaved by human digestive enzymes, the lysine becomes biologically unavailable.
This reduces the nutritional quality of the milk proteins.
This provides the matching: (A)-(II), (B)-(I), (C)-(IV), (D)-(III).

Step 3: Final Answer:
The correct matching sequence is (A) - (II), (B) - (I), (C) - (IV), (D) - (III).