BioChem - DOS

Effect of ultraviolet radiation on photosynthesis, biomass, and fatty acid content and profile of a Scenedesmus rubescens-like microalga

Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformations, production technologies

Li, P.; Lin, J.

The effects of ultraviolet radiation (UVR) and nitrogen (NaNO<SUB>3</SUB>) concentration on photosynthesis, biomass, and fatty acid content and profile of a Scenedesmus rubescens-like microalga were measured in an outdoor 8-day culture study. UV-induced photoinhibition decreased from 42.6% to 3.5%, in the presence of 75mg/L NaNO<SUB>3</SUB> (HN) and from 52.9% to 22.6% in the presence of 7.5mg/L NaNO<SUB>3</SUB> (LN) nitrogen concentration, respectively. The concentrations of UV-absorbing compounds increased 4.3 and 4.9 times under HN and LN, respectively. Biomass accumulation was suppressed (10.7%) by UVR under HN, but not under LN conditions. Carotenoid content decreased from 1.05+/-0.06 to 0.96+/-0.15 (with UV radiation) and to 0.91+/-0.07 (without UV radiation), respectively, under HN, while it decreased to 0.05+/-0.04 (with UV radiation) and to 0.11+/-0.08 (without UV radiation), respectively, under LN. The content of C18:1n9 fatty acids increased by about 430%, whereas that of C18:3n3 decreased by about 65% in both radiation treatments during nitrogen starvation. The results showed that the absence of UVR screening does not change the fatty acid content and profile of S. rubescens-like algae cultivated outdoors under HN and LN conditions.

2012

Elsevier Applied Science

0960-8524

111

pp.316-322

10.1016/j.biortech.2012.01.179

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART62205136

Ultraviolet radiation; Scenedesmus rubescens; FAME; Photosynthesis; Biomass