LED lighting and seasonality effects antioxidant properties of baby leaf lettuce

Samuolienė, G.; Sirtautas, R.; Brazaitytė, A.; Duchovskis, Pavelas

doi:10.1016/j.foodchem.2012.03.061

Cited by 186 publications

(160 citation statements)

References 31 publications

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“…Samuolienė et al (13) again reported that supplemental orange light (622 nm) enhanced the synthesis of phenolic compounds in romaine baby leaf lett uce during the growth period. They also reported in another study (21) that supplemental LED light at 505 nm promoted signifi cant increases in TPC, but on the other hand, LED light at 535 nm resulted in signifi cantly lower TPC. Also in baby leaf lett uce, Li and Kubota (11) showed an increase in TPC aft er exposure to LED light from 600 to 700 nm.…”

Section: Resultsmentioning

confidence: 74%

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Influence of Yellow Light-Emitting Diodes at 590 nm on Storage of Apple, Tomato and Bell Pepper Fruit

Kokalj

Hribar

Cigić

et al. 2016

Food Technol. Biotechnol.

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SummaryThe objective of this study is to investigate the eff ects of irradiation from light-emitt ing diodes (LEDs) on several fruits during storage. To improve storage and increase the contents of some bioactive compounds, apple, tomato and red bell pepper fruits were exposed to yellow light emitt ed from the diodes at 590 nm. The contents of ascorbic acid, total phenolics, total fl avonoids and several pigments were investigated, along with the antioxidant potential. The colour parameters (L*, a* and b*) and fi rmness of the fruit were also determined. Aft er 7 days of LED light irradiation, there was signifi cantly higher total phenolic content and antioxidant potential in apple peel extracts. The irradiated fruit of tomato had signifi cantly higher levels of total phenolic compounds, and the fruit of red bell pepper had signifi cantly higher antioxidant potential. LED light had no eff ects on the colour parameters, although there was a tendency to accelerate colour development. Apple fruit irradiated with LED light was signifi cantly less fi rm. Among twelve analysed pigments, signifi cantly more β-carotene was detected in LED light-irradiated apple and bell pepper fruit, more α-tocopherol and γ-tocopherol in bell pepper fruit, and more lutein in apple peel and bell pepper fruit. The applied LED light slightly accelerated the ripening of the studied fruit, and aff ected the synthesis of some of the secondary metabolites.

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Section: Resultsmentioning

confidence: 74%

“…Responses to diff erent light spectra can vary across plant species or even varieties (21) and are dependent on the maturity stage. It has been shown that white and red LEDs enhance the tomato yield (22), whereas blue LED light had positive eff ects on their growth and development (23,24).…”

Section: Introductionmentioning

confidence: 99%

Influence of Yellow Light-Emitting Diodes at 590 nm on Storage of Apple, Tomato and Bell Pepper Fruit

Kokalj

Hribar

Cigić

et al. 2016

Food Technol. Biotechnol.

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“…In connection with photosynthesis productivity, the amount of photosyntetic pigments can be an evidence of stressors tolerance in plants (Salama et al, 2011;Samuolienė et al, 2012). Our results indicated, that seed exposure to HPM (9.3 GHz) had significant positive effect on the amount of chlorophyll a (0.224 mg g -1 ), chlorophyll b (0.048 mg g -1 ), chlorophylls a + b (0.272 mg g -1 ) and carotenoids (0.082 mg g -1 ) in tomato seedlings fresh mass (Table 3).…”

Section: Results and Analysismentioning

confidence: 99%

The effect of strong microwave electric field radiation on: (1) vegetable seed germination and seedling growth rate

Radzevičius

Sakalauskienė

Dagys

et al. 2013

Zemdirbyste-Agriculture

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The effect of high power microwave (HPM) irradiation on seed germination and seedlings was evaluated. Vegetable seeds were subjected to HPM irradiation. The main focus was on the thermal heating elimination during seeds irradiation. For that reason short high frequency microwave pulses were used. The study object was seeds of different harvest years (2000, 2003 and 2008) of radish (Raphanus sativus L.) variety 'Babtų žara', tomato (Lycopersicon esculentum Mill.) variety 'Viltis', carrot (Daucus sativus Rohl.) variety 'Vaiguva' and tomato (Lycopersicon esculentum Mill.) variety 'Red Cherry' (seeds harvested in 1980). In the first experiment, all seeds were exposed to microwaves at 9.3 GHz frequency for 10 min. In the second experiment, carrots 'Vaiguva' seeds (11 years-old) were exposed to microwaves at 9.3 GHz frequency for 5 and 20 min and exposed to 2.6 and 5.7 GHz microwaves for 10 min. To establish microwave effect on seedling growth rate, tomato, carrot and radish seeds harvested in 2008 were exposed to microwaves at 9.3 GHz frequency for 10 min. It was established that 11 year-old radish seeds exposed to 9.3 GHz microwaves had higher germination as compared with non-irradiated seeds. HPM increased radish germination energy by 6% in seeds harvested in 2003. HPM exposure significantly increased the germination energy and germination of 8 year-old carrot seeds. The highest carrot seed germination was established at 9.3 GHz microwave frequency under 5 min exposure. Seed exposure to HPM (9.3 GHz) had a significant positive effect on dry weight of tomato seedling shoots and on tomato and radish seedling height, but it had negative influence on carrot seedling height. Seed irradiation with HPM (9.3 GHz) had a significant positive effect on the amount of chlorophyll a, chlorophyll b, chlorophylls a + b and carotenoids in tomato seedlings' fresh mass, but the opposite effect was determined in carrot seedlings' fresh mass.

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“…The light environment plays a significant role in influencing physiological changes and secondary metabolite production in plants [3]. Variations in both the artificial lighting spectra [4][5][6][7] and irradiance levels [8,9] can affect growth and nutrition.…”

Section: Introductionmentioning

confidence: 99%

“…Combinations of red, blue and far red LED light wavelengths are reported to be efficient for sprouted seed [4], microgreen [3], wheatgrass [10] and mature lettuce plant [5,11] ) suppressed normal growth and diminished the nutritional value of the Brassica microgreens studied. In general, the most suitable conditions for growth and nutritional quality of the microgreens was 330-440 μmol m -2 s -1 irradiation, which resulted in a larger leaf surface area, lower content of nitrates and higher total anthocyanins, total phenols and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free-radical scavenging capacity.…”

Section: Introductionmentioning

confidence: 99%

LED irradiance level affects growth and nutritional quality of Brassica microgreens

et al. 2013

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This study examines the effect of irradiance level produced by solid-state light-emitting diodes (LEDs) on the growth, nutritional quality and antioxidant properties of Brassicaceae family microgreens. Kohlrabi (Brassica oleracea var. gongylodes, ‘Delicacy Purple’) mustard (Brassica juncea L., ‘Red Lion’), red pak choi (Brassica rapa var. chinensis, ‘Rubi F1’) and tatsoi (Brassica rapa var. rosularis) were grown using peat substrate in controlled-environment chambers until harvest time (10 days, 21/17°C, 16 h). A system of five lighting modules with 455, 638, 665 and 731 nm LEDs at a total photosynthetic photon flux densities (PPFD) of 545, 440, 330, 220 and 110 µmol m−2s−1 respectively were used. Insufficient levels of photosynthetically active photon flux (110 µmol m−2 s−1) suppressed normal growth and diminished the nutritional value of the Brassica microgreens studied. In general, the most suitable conditions for growth and nutritional quality of the microgreens was 330–440 µmol m−2 s−1 irradiation, which resulted in a larger leaf surface area, lower content of nitrates and higher total anthocyanins, total phenols and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free-radical scavenging capacity. High light levels (545 µmol m−2 s−1), which was expected to induce mild photostress, had no significant positive impact for most of investigated parameters.

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LED lighting and seasonality effects antioxidant properties of baby leaf lettuce

Cited by 186 publications

References 31 publications

Influence of Yellow Light-Emitting Diodes at 590 nm on Storage of Apple, Tomato and Bell Pepper Fruit

Influence of Yellow Light-Emitting Diodes at 590 nm on Storage of Apple, Tomato and Bell Pepper Fruit

The effect of strong microwave electric field radiation on: (1) vegetable seed germination and seedling growth rate

LED irradiance level affects growth and nutritional quality of Brassica microgreens

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