Interdisciplinary Centre of Marine and Environmental Research (CIIMAR/CIMAR-LA), University of Porto, Terminal de Cruzeiros de Leixões, Avenida General Norton de Matos s/n, 4450-208 Matosinhos, Portugal.
FCUP-Faculty of Sciences, University of Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal.
Mar Drugs. 2024 Sep 3;22(9):404. doi: 10.3390/md22090404.
Light quality is a key factor affecting algal growth and biomass composition, particularly pigments such as carotenoids, known for their antioxidant properties. Light-emitting diodes (LEDs) are becoming a cost-effective solution for indoor seaweed production when compared to fluorescent bulbs, allowing full control of the light spectra. However, knowledge of its effects on biomass production is still scarce. In this study, we investigated the effects of LEDs on the phenotype of an strain, collected on the Northern Portuguese coast. Effects of white (W), green (G), red (R), and blue (B) LEDs were evaluated for growth (fresh weight and area), photosynthetic activity, sporulation, and content of pigments and antioxidant compounds. The results showed that there were no significant differences in terms of fresh weight accumulation and reduced sporulation among the tested LEDs, while W light induced the highest expansion rate. Under G, attained a quicker photoacclimation, and the highest content of pigments and total antioxidant activity; but with R and W, antioxidant compounds against the specific radicals O and NO were produced in a higher content when compared to other LEDs. Altogether, this study demonstrated that it is possible to modulate the bioactive properties of by using W, R, and G light, opening the path to the production of biomass tailored for specific nutraceutical applications.
光质是影响藻类生长和生物量组成的关键因素，特别是类胡萝卜素等色素，因其具有抗氧化特性而闻名。与荧光灯泡相比，发光二极管（LED）在室内海藻生产中是一种具有成本效益的解决方案，可以完全控制光的光谱。然而，关于其对生物量生产影响的知识仍然很少。在这项研究中，我们研究了 LED 对在葡萄牙北部海岸采集的一株 菌株表型的影响。评估了白光 (W)、绿光 (G)、红光 (R) 和蓝光 (B) LED 对生长（鲜重和面积）、光合作用活性、孢子形成以及色素和抗氧化化合物含量的影响。结果表明，在测试的 LED 中，鲜重积累和孢子形成减少方面没有显著差异，而 W 光诱导的扩张率最高。在 G 光下，达到了更快的光适应，色素和总抗氧化活性含量最高；但是与 R 和 W 相比，针对特定自由基 O 和 NO 的抗氧化化合物含量更高。总的来说，这项研究表明，通过使用 W、R 和 G 光，可以调节 的生物活性特性，为特定的营养应用生产定制的生物质开辟了道路。
