Impact of different frying methods on volatile compounds in tofu

Area of Science:

• Food Science
• Sensory Analysis
• Analytical Chemistry

Background:

• Tofu aroma is crucial for consumer acceptance.
• Frying methods can significantly impact the volatile profile of food.
• Understanding these changes is key to optimizing tofu production.

Purpose of the Study:

• To investigate how deep-frying, air-frying, and pan-frying affect tofu's volatile aroma compounds.
• To correlate sensory perceptions with chemical analysis of aroma.
• To identify the optimal frying method for desirable tofu aroma.

Main Methods:

• Sensory evaluation for overall acceptability.
• Electronic nose analysis for aroma fingerprinting.
• Gas Chromatography-Ion Mobility Spectrometry (GC-IMS) for volatile compound profiling.
• Gas Chromatography-Mass Spectrometry (GC-MS) for detailed compound identification.
• Chemometric methods for data analysis.

Main Results:

• Pan-fried tofu received the highest sensory acceptability scores.
• Distinct volatile fingerprints were observed for each frying method.
• GC-MS identified 153 volatile compounds, with esters being the most abundant.
• Frying significantly altered aroma-active compound generation and transformation.

Conclusions:

• Frying methods profoundly influence the aroma profile of tofu.
• Pan-frying yields the richest and most preferred aroma profile.
• Integrated analytical techniques effectively characterize frying-induced aroma changes in tofu.