+UVA treatment increases the degree of unsaturation in microalgal fatty acids and total carotenoid content in Nitzschia closterium (Bacillariophyceae) and Isochrysis zhangjiangensis (Chrysophyceae)

► UVA stimulates the production of microalgal metabolites. ► UVA increases unsaturation of microalgal fatty acids and carotenoid content. ► UVA-treated microalgae as source of functional food ingredients.