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Life after Harvest: Circadian Regulation in Photosynthetic Pigments of Rocket Leaves during Supermarket Storage Affects the Nutritional Quality

1
Department of Plant Biology and Ecology. University of the Basque Country (UPV/EHU), 48080 Bilbao, Spain
2
Department of Crop and Forest Sciences & AGROTECNIO Center, University of Lleida, 25198 Lleida, Spain
3
Food Technology Division, University of Almería, CeiA3, 40120 Almería, Spain
4
Basque Centre for Climate Change (BC3), 48640 Leioa, Spain
*
Author to whom correspondence should be addressed.
Nutrients 2019, 11(7), 1519; https://doi.org/10.3390/nu11071519
Received: 17 May 2019 / Revised: 28 June 2019 / Accepted: 1 July 2019 / Published: 4 July 2019
(This article belongs to the Special Issue Carotenoids in Human Nutrition)
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Abstract

Vegetables, once harvested and stored on supermarket shelves, continue to perform biochemical adjustments due to their modular nature and their ability to retain physiological autonomy. They can live after being harvested. In particular, the content of some essential nutraceuticals, such as carotenoids, can be altered in response to environmental or internal stimuli. Therefore, in the present study, we wondered whether endogenous rhythms continue to operate in commercial vegetables and if so, whether vegetable nutritional quality could be altered by such cycles. Our experimental model consisted of rocket leaves entrained under light/darkness cycles of 12/12 h over 3 days, and then we examined free-run oscillations for 2 days under continuous light or continuous darkness, which led to chlorophyll and carotenoid oscillations in both constant conditions. Given the importance of preserving food quality, the existence of such internal rhythms during continuous conditions may open new research perspective in nutrition science. However, while chromatographic techniques employed to determine pigment composition are accurate, they are also time-consuming and expensive. Here we propose for the first time an alternative method to estimate pigment content and the nutritional quality by the use of non-destructive and in situ optical techniques. These results are promising for nutritional quality assessments. View Full-Text
Keywords: carotenoids; circadian clock; light; optical indices; supermarket; zeaxanthin carotenoids; circadian clock; light; optical indices; supermarket; zeaxanthin
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Ruiz de Larrinaga, L.; Resco de Dios, V.; Fabrikov, D.; Guil-Guerrero, J.L.; Becerril, J.M.; García-Plazaola, J.I.; Esteban, R. Life after Harvest: Circadian Regulation in Photosynthetic Pigments of Rocket Leaves during Supermarket Storage Affects the Nutritional Quality. Nutrients 2019, 11, 1519.

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