부산대학교 도서관

Highlights • The spectrum of visible light affects the chemical composition of cultivated sprouts. • Light color temperature significantly affects mass percentage of cotyledons. • RGB light led to the highest content of chlorophylls, carotenoids and polyphenols. • RGB LED lighting is the best on the content of bioactive compounds of sprouts. • Dispersed sunlight increases the synthesis of vitamin C in alfalfa sprouts. Abstract The aim of this study was to evaluate the impact of selected types of LED (light emitting diodes) lighting on the quality of alfalfa sprouts. In the experiment, cold white, warm white and multicolour: (red, green, blue-RGB) LEDs were applied, and dispersed sunlight was used as a control. The product was examined for the yield and the contents of dry matter, total polyphenols, ascorbic acid, chlorophylls, β-carotene, lutein, neoxanthin and violaxanthin. Cotyledons' mass in the whole plant increased under LED illumination and was up to 50% greater for sprouts grown in RGB light compared to those cultivated in dispersed sunlight. The highest chlorophyll and carotenoid pigment contents in cotyledons were observed under RGB LED and cold white treatments. Similarly, RGB LEDs allows one to obtain the product with the highest level of total phenolic compounds. The highest ascorbic acid content was observed in sprouts growing under sunlight, followed by RGB. [ABSTRACT FROM AUTHOR]