5. When meat is cooked, protein breaks down, as shown below. The degraded protein is able to undergo a Maillard reaction with glucose released from the breakdown of muscle glycogen. Using the structures below, explain how the proteins is "breaking down" and why this facilitates a Maillard reaction with the glucose. SH this peptide is part of a larger protein SH CH, CH2 NH но CH heat or enzymes °C NH2 and and water (H,0) ČH, CH2 H2C CH3 H2C CH3 CH3 ČH3 OH OH

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**Transcription for Educational Website:**

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**5. Understanding Protein Breakdown During Cooking and the Maillard Reaction**

When meat is cooked, protein breaks down, as illustrated below. The degraded protein undergoes a Maillard reaction with glucose released from the breakdown of muscle glycogen. Using the structures below, we will explore how proteins break down and why this facilitates a Maillard reaction with glucose.

**Chemical Structure Breakdown:**

1. **Initial Structure:**
   - The image shows a peptide that is a part of a larger protein. It includes typical peptide bonds connecting various amino acids.

2. **Process Description:**
   - The peptide undergoes a breakdown process facilitated by heat or enzymes and the presence of water (H₂O). 

3. **Resulting Structures:**
   - Two distinct structures emerge after the breakdown.
   - The first molecule includes C, H, N, O, and S atoms, with functional groups indicating amino and carboxyl ends and an SH (thiol) group.
   - The second molecule also contains C, H, N, and O atoms, with distinct carboxyl and amino groups, indicating separate amino acid structures.

**Diagram Explanation:**

- The diagram details the peptide chain with various functional groups highlighted.
- An arrow indicates the transformation of the peptide under heat/enzymes and water to yield smaller molecules.
- The resulting structures reveal how distinct functional groups are exposed or altered, which may react further during the Maillard reaction.

The degradation of proteins in cooking facilitates the Maillard reaction by exposing reactive sites, such as amino groups, which can interact with glucose, leading to the complex flavors and colors associated with cooked meat.

--- 

This explanation is designed to help learners understand the biochemical processes involved in cooking meat and the implications for flavor development.
Transcribed Image Text:**Transcription for Educational Website:** --- **5. Understanding Protein Breakdown During Cooking and the Maillard Reaction** When meat is cooked, protein breaks down, as illustrated below. The degraded protein undergoes a Maillard reaction with glucose released from the breakdown of muscle glycogen. Using the structures below, we will explore how proteins break down and why this facilitates a Maillard reaction with glucose. **Chemical Structure Breakdown:** 1. **Initial Structure:** - The image shows a peptide that is a part of a larger protein. It includes typical peptide bonds connecting various amino acids. 2. **Process Description:** - The peptide undergoes a breakdown process facilitated by heat or enzymes and the presence of water (H₂O). 3. **Resulting Structures:** - Two distinct structures emerge after the breakdown. - The first molecule includes C, H, N, O, and S atoms, with functional groups indicating amino and carboxyl ends and an SH (thiol) group. - The second molecule also contains C, H, N, and O atoms, with distinct carboxyl and amino groups, indicating separate amino acid structures. **Diagram Explanation:** - The diagram details the peptide chain with various functional groups highlighted. - An arrow indicates the transformation of the peptide under heat/enzymes and water to yield smaller molecules. - The resulting structures reveal how distinct functional groups are exposed or altered, which may react further during the Maillard reaction. The degradation of proteins in cooking facilitates the Maillard reaction by exposing reactive sites, such as amino groups, which can interact with glucose, leading to the complex flavors and colors associated with cooked meat. --- This explanation is designed to help learners understand the biochemical processes involved in cooking meat and the implications for flavor development.
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