Intended use:

The Lateral Flow Hazelnut incl. Hook Line from Bioavid is an immunochromatographic test for the qualitative detection of hazelnut residues in environmental samples (e.g. in food production lines), CIP-water and food samples. The assay is applied for the detection of small amounts of hazelnut contaminations.


Unfortunately, very high amounts of an analyte in the sample can lead to falsely lowered or negative results – called the hook effect. The new dip-sticks will include an additional line, the hook line, in order to detect this effect. For now, the new test (BLH704-20 Lateral Flow Hazelnut incl. Hook Line) will not replace the old one without a hook line (BL604-10 / BL604-25 Lateral Flow Hazelnut), but it is an additional product offer with new functionality.

General Information:

Hazelnut (Corylus avellana) is one of the most popular tree nuts worldwide. Generally, hazelnuts are used in a variety of food industries. Hazelnuts are very common ingredients of chocolate products and are also consumed as snacks and in bakery products such as cookies. They are also utilized as an add-on for dressings, salads or in order to refine fish meals. Hazelnut is one of eight foods, which are the most frequent cause of food allergies. In Central Europe, more than 90 % of hazelnut allergies are associated with an allergy to tree pollens. Consumption of a few milligrams of hazelnut can induce allergic reactions in sensitized individuals. Therefore, labeling of hazelnut containing products is very important and compulsory in the USA and the European Union as well as in many other countries. The main threat for sensitized individuals is contamination of hazelnut in food, which is intended to be hazelnut-free (e.g. hazelnut traces in chocolate which should not contain hazelnuts). Therefore, it is important to test foods, which may have been contaminated during their production process for the presence of unintended traces of hazelnuts.
According to the regulation (EU) No. 1169/2011, hazelnut and products thereof must be declared on food labels. Similar regulations exist e.g. in the USA, Canada, Australia and New Zealand.


  • Extended functionality: included hook line for safe identification of high positive samples (> 1,000 ppm).
  • More precise statement in a bigger range than conventional test strips (valid results in the range of 1 – 1,000 ppm).
  • A fast, reliable and easy-to-use dip stick system detecting hazelnut in production lines, raw materials and processed food (results in 10 min).
  • More information and benefits can be found on this flyer.


Article NumbersBLH704-20
Test format 20 x test strips
for 20 determinations
Sample preparation - Swabbing method: cleaning surface with pre-treated swab, wash out the swab and measure.
- Food assay: homogenise food sample, filter, measure.
- Liquid samples: no preparation.
Incubation time 5 min
Room temperature
LOD (Detection limit) - Food samples: 1 ppm
- Swabbing: ≥ 1 µg
- CIP-water: 1 µg / ml
Cross reactivity

13 matrices tested without cross reactivity

Detected analyte

Hazelnut residues

Evaluation Visual evaluation
External link I URL Bioavid Homepage - Documents for Hazelnut
Links SOP Verification for new/unknown solid samples
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