Proteon Walnut Express


In 10 minutes and without equipment, anyone can verify that your production is free from walnut.

Are you considering of doing allergen control but you do not know how to approach it?
Do you want to verify cleaning between productions when sharing production lines?
Do you have many products to analyse and you need results immediately or within a day?
Are you implementing IFS, BRC or ISO 22000 2005 quality standard?
Are your products thermally processed and this can affect the detection of walnut?


The speed and simplicity of the Proteon Express tests allow adapting the allergen analysis to the time and place you need. Having specific information will allow us to make immediate decisions between productions, detect insufficient cleanings, control critical points of contamination and ensure the release of your product to the market without risk.
Proteon Walnut Express helps you to detect walnut in food matrices.


Immunochromatographic assay, in a fast strip format, based on the detection of Jug r1 by a specific antibody in a non-competitive sandwich assay.


Limit of detection: 1 ppm of walnut proteins.
Limit of detection in surfaces: 0.5 µg of walnut proteins.
Assay time: 10 min.


Internal validation following International guidelines:

Appendix M: Validation Procedures for Quantitative. Food Allergen ELISA Methods: Community Guidance and Best Practices. AOAC 2012 (

Appendix F: Guidelines for Standard Method Performance Requirements. Official Methods of Analysis (2016), AOAC INTERNATIONAL, Rockville, MD, USA (

Standard Method Performance Requirements (SMPRs®) for Detection and Quantitation of Selected Food Allergens. AOAC SMPR 2016.002. AOAC INTERNATIONAL, Rockville, MD, USA (

Supporting bibliography for validation of antibodies and extraction methods of food samples:
Segura-Gil et al. (2020). Influence of different extraction conditions on the detection of glycinin and β-conglycinin in model processed foods by ELISA. Food Additives and Contaminats Part A.
Segura-Gil et al. (2019). Development of sandwich and competitive ELISA formats to determine β-conglycinin: Evaluation of their performance to detect soy in processed food. Food Control (103) 78-85.


Regulation (EU) No 1169/2011 of the European Parliament and of the Council of 25 October 2011 on the provision of food information to consumers, amending Regulations (EC) No 1924/2006 and (EC) No 1925/2006 of the European Parliament and of the Council, and repealing Commission Directive 87/250/EEC, Council Directive 90/496/EEC, Commission Directive 1999/10/EC, Directive 2000/13/EC of the European Parliament and of the Council, Commission Directives 2002/67/EC and 2008/5/EC and Commission Regulation (EC) No 608/2004 Text with EEA relevance.