Biomaterial Database

Enhancement of polyunsaturated fatty acids and total carotenoid production in microalgae by ultraviolet band A (UVA, 365 nm) radiation. 2011

Jim Junhui Huang, and Peter Chikeung Cheung

Biology Programme, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, People's Republic of China.

Two microalgae, Porphyridium cruentum and Platymonas subcordiformis , were subjected to a 3-day exposure of ultraviolet band A (UVA) radiation at 365 nm (∼1.32-1.35 W/m(2)) and photosynthetically active radiation (PAR) (∼11.56-11.62 W/m(2)) followed by a 3-day UVA-free (exposure to PAR only) treatment. UVA inhibited the growth of P. subcordiformis and P. cruentum during the UVA-exposure period. Significant increases (p < 0.05) of total polyunsaturated fatty acids (PUFAs), saturated fatty acids (SFAs), and lipid content were found in P. cruentum during the UVA exposure period, whereas such increases in P. subcordiformis 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 (p < 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.

UI	MeSH Term	Description	Entries
D002338	Carotenoids	The general name for a group of fat-soluble pigments found in green, yellow, and leafy vegetables, and yellow fruits. They are aliphatic hydrocarbons containing 4 terpene subunits.	Carotenes,Carotenoid,Tetraterpene Derivatives,Tetraterpenes,Carotene,Derivatives, Tetraterpene
D005231	Fatty Acids, Unsaturated	FATTY ACIDS in which the carbon chain contains one or more double or triple carbon-carbon bonds.	Fatty Acids, Polyunsaturated,Polyunsaturated Fatty Acid,Unsaturated Fatty Acid,Polyunsaturated Fatty Acids,Acid, Polyunsaturated Fatty,Acid, Unsaturated Fatty,Acids, Polyunsaturated Fatty,Acids, Unsaturated Fatty,Fatty Acid, Polyunsaturated,Fatty Acid, Unsaturated,Unsaturated Fatty Acids
D014466	Ultraviolet Rays	That portion of the electromagnetic spectrum immediately below the visible range and extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants.	Actinic Rays,Black Light, Ultraviolet,UV Light,UV Radiation,Ultra-Violet Rays,Ultraviolet Light,Ultraviolet Radiation,Actinic Ray,Light, UV,Light, Ultraviolet,Radiation, UV,Radiation, Ultraviolet,Ray, Actinic,Ray, Ultra-Violet,Ray, Ultraviolet,Ultra Violet Rays,Ultra-Violet Ray,Ultraviolet Black Light,Ultraviolet Black Lights,Ultraviolet Radiations,Ultraviolet Ray
D058086	Microalgae	A non-taxonomic term for unicellular microscopic algae which are found in both freshwater and marine environments. Some authors consider DIATOMS; CYANOBACTERIA; HAPTOPHYTA; and DINOFLAGELLATES as part of microalgae, even though they are not algae.	Microphytes