In food safety analysis, detecting a target substance is only part of the process. An equally important question is whether the testing method can deliver reliable results in the specific food being examined.
Different food products have different compositions. Milk, honey, meat, eggs, cereals and processed foods contain varying levels of proteins, fats, sugars, pigments and other components. These substances can influence sample preparation and analytical performance, making food matrix validation an essential part of reliable testing.
Recent developments in food regulation have brought renewed attention to this issue. On October 29, 2026, the U.S. Food and Drug Administration (FDA) published updated infant formula testing information alongside a proposed review of nutrient requirements. Its testing program covers various chemical contaminants, including heavy metals, pesticides, PFAS and phthalates. The agency also emphasizes that analytical methods must be specifically developed and validated for the relevant food matrices, including infant formula.
The broader lesson applies to food testing across many industries: a method that performs well in one sample type should not automatically be assumed to perform equally well in another.
Why Food Matrices Can Affect Testing Results
Food samples are complex mixtures rather than simple laboratory solutions. Their composition may influence how target substances are extracted, how antibodies interact with analytes and how detection signals are generated.
For example, high-fat samples may require additional preparation to reduce interference, while samples containing strong pigments or complex proteins may affect certain analytical procedures.
These effects are commonly referred to as matrix effects. If they are not properly evaluated, they may contribute to inaccurate measurements, reduced sensitivity or inconsistent results.
Therefore, selecting a suitable detection method requires more than identifying the target substance. The sample type and preparation procedure must also be considered.
What Makes a Reliable Testing Method?
A reliable food safety testing method should be evaluated under the conditions in which it will actually be used.
Several factors deserve particular attention:
l Sensitivity: Can the method detect the target substance at the required concentration?
l Specificity: Can it distinguish the target from other substances in the sample?
l Recovery: Can the target substance be accurately measured after sample extraction and preparation?
l Repeatability: Can consistent results be obtained when the same sample is tested under the same conditions?
l Matrix compatibility: Has the method been evaluated for the intended food type?
These considerations are particularly important when testing products with different compositions or when laboratories handle a wide variety of food samples.
Choosing Between Rapid Screening and Laboratory Analysis
Different testing technologies serve different purposes.
Rapid test strips provide convenient screening options for selected targets and validated sample matrices. They are useful when food producers and quality control teams need timely preliminary results.
ELISA kits, on the other hand, offer sensitive immunoassay-based analysis and can support quantitative testing for specific contaminants and residues.
Neither technology should be treated as universally suitable for every food matrix. Following the product instructions, applying the appropriate sample preparation procedure and verifying method suitability are essential for obtaining dependable results.
Where required, suspicious or non-compliant findings should be further evaluated using an appropriate confirmatory method.
Kwinbon: Developing Testing Solutions for Different Food Applications
Beijing Kwinbon Technology Co., Ltd. specializes in immunodiagnostic technologies and develops rapid test strips and ELISA kits for food and feed safety applications.
Its product portfolio covers a wide range of testing targets, including antibiotics, mycotoxins, pesticides, food additives, animal feed-related hormones and food adulteration.
With solutions designed for different applications and sample types, Kwinbon supports food manufacturers, laboratories and inspection organizations in establishing practical testing procedures.
As food products and analytical requirements continue to evolve, the importance of method suitability and reliable testing performance will only increase.
Accurate food safety testing does not begin with the instrument or test kit alone. It begins with understanding the sample, selecting the appropriate method and ensuring that the entire testing procedure is suitable for its intended application.
Post time: Oct-30-2026