Journal of Food, Agriculture and Environment

Supplementary red-LED lighting and the changes in phytochemical content of two baby leaf lettuce varieties during three seasons

Author(s):

Giedrė Samuolienė, Ramūnas Sirtautas, Aušra Brazaitytė, Akvilė Viršilė, Pavelas Duchovskis

Recieved Date: 2012-07-06, Accepted Date: 2012-09-30

Abstract:

The impact of supplementary 638-nm LEDs lighting (16-h; PPFD-210 µmol m^-2s^-1; PPFD in combination with HPS-300 µmol m^-2s^-1) 3 days before harvesting during different growing seasons for changing levels of phytochemicals and postharvest nutritional quality in miniature variety of Romaine Little Gem ‘Thumper’ and curly baby leaf ‘Multibaby’ lettuce was evaluated. The correlation results between total phenolics and DPPH measurements suggest that phenolic compounds largely pertains on the antioxidant capacity. High correlation between ascorbic acid and glucose content under supplemental red-LED lighting shows that changes of ascorbic acid accumulation and glucose metabolism are linearly related. Thus short-term irradiation with supplemental red-LEDs before harvesting during particular growing season can produce baby leaf lettuce rich in total phenolics (28.5%), tocopherols (33.5% in ‘Multibaby’), sugars (52.0%) and antioxidant capacity (14.5%) but not in ascorbic acid (decrease 64.3%). Moreover, improved nutritional quality remains up to one week after lighting treatment. 

Keywords:

 Ascorbic acid, carbohydrates, DPPH•, light manipulation, phenols, tocopherols

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Agriculture
Pages: 701-706

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