Egg Testing

1. Inspection items
Appearance quality inspection: observe the eggshell, which should be complete, without cracks, clean surface and normal color. Deformed eggs, sandy shell eggs and other eggs with abnormal appearance may be affected by adverse factors during the formation process, and their internal quality may also have problems, such as short storage period and easy deterioration.

Freshness inspection: through the egg illumination method, use strong light to illuminate the eggs to check the size of the air chamber. The air chamber of fresh eggs is small, and as the storage time increases, the air chamber gradually becomes larger; the Haff unit can also be detected, which reflects the consistency of egg white. The higher the Haff unit, the fresher the egg, and the better the taste and nutritional value.

Microbial index detection: focus on the detection of pathogenic bacteria such as Escherichia coli and Salmonella. Contaminated eggs may carry these bacteria, which can easily cause food poisoning after consumption, endangering human health, especially for people with weak immunity such as the elderly, children, and pregnant women.

Nutrient component detection: analyze whether the content of protein, fat, vitamins, etc. in eggs meets the standards. High-quality eggs should contain rich and reasonably proportioned nutrients to ensure adequate nutrition for consumers.

2. Testing methods
Visual appearance method: Inspectors rely on their naked eyes and experience to directly observe the appearance of eggs and screen out eggs with obvious defects. It is simple and quick, but relatively subjective.

Instrumental analysis method: Use professional egg quality analyzers to measure freshness indicators such as Haugh units and yolk color, and the data is accurate; use microbial culture method to inoculate egg liquid samples on specific culture media, observe bacterial growth, and determine the degree of microbial contamination.

Physical and chemical testing method: Use chemical analysis methods to determine the nutritional components of eggs, such as Kjeldahl nitrogen determination method to measure protein content, and accurately calculate the proportion of each nutrient through a series of chemical reactions.

3. Testing standards
GB 2749 "National Food Safety Standard Eggs and Egg Products" is implemented in China, which clearly stipulates the qualified range of various indicators such as egg appearance, freshness, and microbial limits; internationally, different countries formulate relevant standards based on their own national conditions, and exported eggs must meet the strict requirements of importing countries. For example, the EU has extremely strict standards for veterinary drug residues in eggs.

4. Significance of testing
For farmers and manufacturers, strict testing can ensure product quality, enhance brand reputation, avoid economic losses due to quality problems, and stabilize market share. For consumers, eating qualified eggs that have been tested can ensure nutrition and health. From the perspective of industry development, standardized testing promotes the optimization of breeding and production links, promotes the egg industry to develop in a green, safe, and high-quality direction, and enhances international competitiveness.

In short, egg testing is of great significance in all links of the industrial chain and is an important line of defense to protect people's tables.