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Titolo:
Effects of nitrogen source and concentration on growth rate and fatty acidcomposition of Ellipsoidion sp (Eustigmatophyta)
Autore:
Xu, NJ; Zhang, XC; Fan, X; Han, LJ; Zeng, CK; Tseng, CK;
Indirizzi:
Ocean Univ Qingdao, Coll Marine Life Sci, Qingdao 266003, Peoples R China Ocean Univ Qingdao Qingdao Peoples R China 266003 66003, Peoples R China Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China Chinese Acad Sci Qingdao Peoples R China 266071 266071, Peoples R China
Titolo Testata:
JOURNAL OF APPLIED PHYCOLOGY
fascicolo: 6, volume: 13, anno: 2001,
pagine: 463 - 469
SICI:
0921-8971(200112)13:6<463:EONSAC>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHAEODACTYLUM-TRICORNUTUM; BIOCHEMICAL-COMPOSITION; CULTURE; MICROALGAE; NITRATE; ALGAE; CYCLE;
Keywords:
ammonium urea; eicosapentaenoic acid; fatty acid; Ellipsoidion sp.; microalga; nitrate; nitrogen concentration; nitrogen source; PUFA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Zhang, XC Ocean Univ Qingdao, Coll Marine Life Sci, Qingdao 266003, Peoples R China Ocean Univ Qingdao Qingdao Peoples R China 266003 ples R China
Citazione:
N.J. Xu et al., "Effects of nitrogen source and concentration on growth rate and fatty acidcomposition of Ellipsoidion sp (Eustigmatophyta)", J APPL PHYC, 13(6), 2001, pp. 463-469

Abstract

In order to study the effects of different nitrogen source and concentration on the growth rate and fatty acid composition, a marine microalga Ellipsoidion sp. with a high content of eicosapentaenoic acid (EPA) was cultured in media with different nitrogen sources and concentrations. During the pre-logarithmic phase, the alga grew faster with ammonium as N source than with nitrate, but the reverse applied during the post-logarithmic phase. The alga grew poorly in N-free medium or medium with urea as the sole N source. In the same growth phase, ammonium medium resulted in higher yield of totallipid, but the EPA yield did not differ significantly different from that using nitrate medium. The maximum growth rate occurred in medium containing1.28 mmol L-1 sodium nitrate, while maximum EPA and total lipid contents were reached at 1.92 mmol L-1, when EPA accounted for 27.9% total fatty acids. The growth rate kept stable when NH4Cl ranged from 0.64 to 2.56 mmol L-1, and the maximum content of total lipid and EPA occurred in the medium with 2.56 mmol L-1 NH4Cl. The EPA content was higher in the pre- than post-logarithmic phase, though the total lipid content was lower. The highest EPA content expressed as percent total fatty acid was 27.9% in nitrate medium and and 39.0% in ammonium medium.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 13:19:42