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Effect of nitrate and phosphate on accumulation of β-carotene isomers inDunaliella salina
Authors:Liu Jian-guo  Wu Chao-yuan  Chen Nian-hong  Wang Yu-jun  Yu Li-dong
Affiliation:(1) Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao
Abstract:Dunaliella salina, a halotolerant unicellular green alga, can accumulate a large amount of β-carotene under certain environmental conditions. The isomers of β-carotene extracted fromD. salina cultured in medium with different nitrate and phosphate concentrations were analysed by HPLC with Alox-T alumina column. At least six isomers were found in different proportions depending on the culture media's nitrate and/or phosphate concentrations. Nitrate and/or phosphate deficiency was conducive to the accumulation of total cis isomers but not of all trans isomer. It is suggested that 1 mmol/L KNO3 and 0.1 mmol/L KH2 PO4 are favourable for accumulation of total cis β-carotene. Contribution No. 2090 from the Institute of Oceanology, Chinese Academy of Sciences. This project was supported by the National Natural Science Foundation of China, Grant No. 38970587.
Keywords:Dunaliella salina   β  -carotene isomer  cis and trans isomers  accumulation  nitrate and phosphate effect
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