초록
<P>Two microalgae, <named-content content-type='genus-species' xlink:type='simple'>Porphyridium cruentum</named-content> and <named-content content-type='genus-species' xlink:type='simple'>Platymonas subcordiformis</named-content>, were subjected to a 3-day exposure of ultraviolet band A (UVA) radiation at 365 nm (∼1.32−1.35 W/m<SUP>2</SUP>) and photosynthetically active radiation (PAR) (∼11.56−11.62 W/m<SUP>2</SUP>) followed by a 3-day UVA-free (exposure to PAR only) treatment. UVA inhibited the growth of <I>P. subcordiformis</I> and <I>P. cruentum</I> during the UVA-exposure period. Significant increases (<I>p</I> < 0.05) of total polyunsaturated fatty acids (PUFAs), saturated fatty acids (SFAs), and lipid content were found in <I>P. cruentum</I> during the UVA exposure period, whereas such increases in <I>P. subcordiformis</I> were observed only at the end of the UVA-free period. Concentrations of individual PUFAs including linoleic acid, eicosatrienoic acid, and eicosapentaenoic acid as well as total carotenoids were significantly increased (<I>p</I> < 0.05) at different stages of the UVA treatment in both microalgae. UVA (365 nm) radiation has the potential application for producing microalgal biomass rich in PUFAs and carotenoids as a natural functional ingredient.</P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jf200910p'>ACS Electronic Supporting Info</A></P>