The bright side of cucumber

Cucumber is one of the most popular vegetables in Polish cuisine, loved both in its pickled and fresh versions. However, the question often arises – why do some cucumbers taste bitter? The answer lies in cucurbitacin, a substance that plays a protective role in plants. A Wrocław dietician explains how to avoid this unpleasant aftertaste and enjoy the taste of cucumbers to the fullest.

Cucumber is probably one of the Poles’ favourite vegetables – in 2014, the average annual consumption of this vegetable was 6.24 kg/person. We eat it in the form of pickles, sour pickles, cucumber salads, or as an ingredient in salads. Most people who have ever prepared dishes with the addition of green cucumber probably know that it should be peeled from the light end – the one furthest from the stem. Otherwise, the cucumber will have a bitter aftertaste. But why is this happening? Dietetyk Wrocław explains!

The substance that gives cucumbers bitterness is cucurbitacin, found in plants from the cucurbitaceae family. From a chemical point of view, cucurbitacin is classified as a tricyclic triterpenoid. This substance plays a protective role in plants against pests and herbivores. In the case of cucumbers, the largest amount of cucurbitin is located in the leaves, stem and dark end of the vegetable (which is also closest to the stem). That is why when we peel the cucumber from its darker side, we spread the bitter substance over its entire surface, thus leading to the characteristic bitter aftertaste of the vegetable. So let’s peel the cucumber from its light side and enjoy its unbitter taste.

A bit about the properties of cucurbitacin:

  • paralyzes the nervous system of parasites, thus accelerating their removal from the digestive tract;
  • acts choleretic, increases the secretion of digestive juices;
  • exhibits anti-inflammatory, antibacterial and antifungal effects.

Based on:

Polish cucumber production – PPR

Horie H., Ito H., Ippoushi K. et al.: Cucurbitacin C – bitter principle in cucumber plants. Jpn Agric Res Q, 2007, 41, 65-68

Lee D., Iwanski G. B., Thoennissen N. H.: Cucurbitacin: ancient compound shedding new light on cancer treatment. Sci World J, 2010, 10, 413-418

Tomczyk A.: The effect of spider mite feeding on the content of selected secondary metabolites in cucumber leaves. Zesz Probl Postęp Nauk Rol, 2006, 509, 405-412

Rekiel A., Grzesiuk K., Sońta M.: Fodder pumpkin – cultivation, harvesting, research, feed use. Przegląd Hodowlany, 2019, 2, 11-14

Kurzeja E., Synowiec A., Stec M. et al.: Evaluation of the antioxidant potential of juices from selected vegetables from the cucurbit family. Bromat Chem Toksykol, 2011, 44, 911-915

Kamila Młoczek

mgr inż. żywienia człowieka i dietetyki oraz psychodietetyk.