Raman Spectroscopy Monitoring of Duck Egg Brining Process

Area of Science:

• Food Science
• Agricultural Science
• Chemistry

Background:

• Salted duck eggs are a staple in Chinese cuisine, particularly in pastries like mooncakes.
• The traditional 30-day brining process is time-consuming and impacts production efficiency.

Purpose of the Study:

• To investigate how salt concentration and added wine affect the duck egg brining process.
• To determine if brining time can be optimized without compromising quality.

Main Methods:

• Duck eggs were brined using four different conditions: 18% salt, 25% salt, 18% salt with 10% wine, and 25% salt with 10% wine.
• The effects of these conditions on egg yolk and white properties were analyzed, including Raman spectroscopy for egg whites.

Main Results:

• Increased salt concentration and the addition of 10% wine (53% alcohol) accelerated the brining process for duck egg yolks.
• Egg white Raman spectra remained stable across all brining conditions, indicating minimal structural changes.

Conclusions:

• The brining period for salted duck eggs can be reduced from 30 days to 20-25 days by increasing salt concentration or adding wine.
• Optimized brining conditions lead to largely stable egg yolk structures, enhancing production efficiency.