Characterization of cooked cheese flavor: Volatile components

Area of Science:

• Food Chemistry
• Sensory Science
• Dairy Science

Background:

• The aroma of cooked cheese is crucial for its consumer appeal, particularly in processed foods.
• Understanding the volatile compounds responsible for cooked cheese aroma and how fat content affects their formation is essential for product development.

Purpose of the Study:

• To identify volatile compounds contributing to the aroma of cooked cheese.
• To investigate the role of fat content in the development of these aroma compounds during cooking.

Main Methods:

• Utilized solid-phase microextraction (SPME) coupled with gas chromatography-olfactometry (GC-O) and gas chromatography-mass spectrometry (GC-MS) to identify volatiles in cooked Cheddar.
• Quantitated selected odorants in various cheeses (mature Cheddar, mild Cheddar with varying fat content, mozzarella, Parmesan) in both uncooked and cooked states.
• Employed principal component analysis to correlate fat concentration with odorant formation in mild Cheddar.

Main Results:

• Significant differences in volatile compounds were observed between cooked and uncooked cheeses.
• Strecker aldehydes, pyrazines, and furanones were significantly higher in cooked cheeses.
• Ethyl esters, important in uncooked cheese aroma, were absent in cooked samples.
• Higher fat concentration in mild Cheddar positively correlated with the formation of Strecker aldehydes, methanethiol, 2-methylketones, and fatty acids upon cooking.

Conclusions:

• Fat content plays a significant role in the formation of key aroma compounds during cheese cooking.
• Identified volatile compounds and their precursors can guide the dairy industry in developing improved cooked cheese products, especially reduced-fat varieties.
• Findings support the flavoring industry in creating authentic cooked cheese flavorings for food applications.