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BASQUE RESEARCH
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Victoria Alfonso Seminario
Universidad Pública de Navarra
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ucc@unavarra.es
(+34) 948168457
Universidad Pública de Navarra

2012/10/3

The use of essential oils as antigerminants for the storage of potatoes could be a good solution as an alternative to chemical treatment

One of the critical moments in the final quality of the potato occurs during its storage, as there exists the risk of sprouting or rotting due to pathogenic agents such as bacteria and fungi. In order to avoid this, agricultural engineer David Gómez Castillo carried out research for his PhD on the possibility of substituting the current use of chemical products by treating the tuber with essential oils of mint, caraway, coriander, eucalyptus and clove, “which have proved to be great potential inhibitors in the main problems detected”.

The chemical product Clorprofam (CIPC) is the most commonly used as a sprout suppressant on stored potatoes. Nevertheless, possible reductions in permitted dosages, market and consumer pressures seeking healthier and, moreover, more environmentally-friendly products, have made it necessary to find alternatives to these synthetic products, with the market, culinary and technological quality of the potato remaining unaltered.

This is the context of the research by David Gómez Castillo, who has evaluated alternative treatment using essential oils of mint, caraway, coriander, eucalyptus and clove. In concrete, he studied the effect of applying these oils with table-stock varieties of the potato (Agata and Monalisa) and industrial ones (Agria and Kennebec), and compared the results thereof with those that had been treated chemically.

A good alternative

The research analysed two parameters: the commercial quality (germination, texture and colour of the tuber) and the culinary and technological quality (colour and texture of slices of the potato, dry material, total soluble solids, reductor sugars and sensorial analysis). Evaluations at 10, 25, 40, 55 and 70 days in storage were also undertaken, the antimicrobial effect of essential oils being assessed for the principal phytopathogens (fungi and bacteria).

According to Mr Gómez, “we found a high antigerminant capacity with treatment using the essential oil of coriander for industrial crops, and with the essential oil of mint for both industrial and table-stock crops. These showed great inhibitory potential on the principal phytopathogenic problems studied and all this makes a good alternative to CPIC use for storage of potatoes”.

It was also shown that the essential oil of eucalyptus, for its high antigerminant capacity with table-stock potatoes, “could be another alternative for reducing post-harvest losses due to phytopathogenic problems, obtaining even better results if the treatment is accompanied by the essential oil of clove”.

In the opinion of this researcher, the use of treatment with essential oils in the storage of potatoes “can provide added value in the application of antigerminant treatment, due to its efficacy in controlling the progress of important phytopathogens”.

Nekazaritza, Bioteknologia Go to top of page
Internet reference
www.unavarra.es
References
Gómez, D. Trujillo, Y. Arroqui, C. Vírseda, P. 2008. Estudio del comportamiento antimicrobiano de un tratamiento de naturaleza orgánica basado en el uso de NAC como agente conservante en potato mínimamente procesada. Póster. Libre. II Food and Health II International conference of food science and technology. Pamplona, Spain. Books of abstracts. ISBN 978-84-691-7294-0.
Gómez, D. Arroqui, C, Vírseda P. 2009. Effects of Essentials oils on sprout suppression and global quality of potatoes cv Monalisa. 5 International Technical Symposium on Food Processing, Monitoring Technology in Bioprocesses and Food Quality Management. Potsdam, Germany. Books of abstracts. ISBN 0947-7314.
Gómez, D. Bobo, G. Arroqui, C, Vírseda P. 2010. Essential Oils as sprouting inhibitor on potato tubers. International conference on food innovation, foodInnova 2010, Valencia, Spain. Books of abstracts. ISBN 978-84-693-5011-9.
Bobo, G. Gómez, D. Arroqui, C, Vírseda P. 2010. Green Tea as alternative to sulphites in Fresh-Cut Potatoes. International conference on food innovation, foodInnova 2010, Valencia, Spain. Books of abstracts. ISBN 978-84-693-5011-9.
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